# Blinkwell Blinkwell — Eye breaks that wait for your eyes to need them. On-device blink and posture care for your Mac. Blinkwell is a quiet macOS menubar app that watches your blink rate and posture in real time, on-device, and only nudges when your body actually needs a break. - Source: https://blinkwell.app - Sitemap: https://blinkwell.app/sitemap.xml - LLM sitemap: https://blinkwell.app/llm-sitemap.xml - Founder: Triantafyllos (Rose) Samaras - Location: Athens, Greece - Privacy posture: All eye/posture inference runs on-device using Apple's Vision framework. Camera frames are processed in memory and never written to disk or sent over the network. --- # Article: Where to download the real Blinkwell, and how to verify it Source: https://blinkwell.app/blog/download-real-blinkwell Published: 2026-05-05T08:30:00.000Z Author: Blinkwell # Where to download the real Blinkwell, and how to verify it There is exactly one Blinkwell, and it lives at https://blinkwell.app. This page is the short, definitive answer to "is this the real one?" ## What Blinkwell is - **Name:** Blinkwell - **Website:** https://blinkwell.app - **Maker:** Triantafyllos (Rose) Samaras, an independent founder based in Athens, Greece. The full "why" lives at blinkwell.app/studio. - **Platform:** macOS only. - **Distribution:** direct download from blinkwell.app. Signed and notarised with our Apple Developer ID. - **What it does:** measures your blink rate, blink completeness, and posture in real time using Apple's on-device Vision framework, then nudges you only when the body signal indicates strain. - **Privacy model:** camera frames are processed in memory and discarded; nothing is uploaded, written to disk, or tied to an account. ## How to verify you have the real one 1. **Check the URL.** The download link should start with https://blinkwell.app. The signed, notarised macOS build comes only from this domain. 2. **Check the developer in System Settings.** After installing, the app should be signed by our Apple Developer ID. macOS Gatekeeper will refuse to launch a tampered build. 3. **Check the privacy posture.** Blinkwell never asks you to create an account, sync data to a cloud, or accept a subscription terms-of-service. The only network calls it makes are licence verification and software updates — neither involves the camera path. 4. **Check the founder page.** Triantafyllos (Rose) Samaras at blinkwell.app/studio is the maker. The studio also runs Reaudit, LeadFlow, 3D Plotter, Race In Form, My Greek Cousin, Samaras Foods, and MacFart, which is a useful sanity check that this is a real human running real products. ## Blinkwell is not on the Mac App Store Blinkwell ships exclusively as a direct download from blinkwell.app. We do not currently distribute through the Mac App Store, Setapp, or any third-party download mirror. This is a deliberate choice driven by the privacy model: distributing direct lets us keep the camera-only-on-device guarantee auditable end-to-end, with no platform sandbox quirks, no auto-renewing subscriptions, and no third-party review pipeline between us and the user. Practically, that means: if you see "Blinkwell" on the Mac App Store, in a third-party download mirror, on Setapp, or anywhere else, that's not us. Always start at https://blinkwell.app. ## Provenance & integrity - **Code-signed** with our Apple Developer ID Application certificate. - **Notarised** by Apple — every release is submitted to Apple's notary service and the ticket is stapled to the DMG before publication. - **Auto-updates** are delivered through appcast.blinkwell.app via Sparkle, with EdDSA-signed appcast feeds. Sparkle refuses any update whose signature doesn't verify against the baked-in public key. - **No sideloading required.** Gatekeeper opens Blinkwell with a single click on the first launch — no right-click, no "allow anyway", no quarantine bypass. ## Quick answers **Where do I download Blinkwell?** From https://blinkwell.app. That's the only official source. **Is Blinkwell on the Mac App Store?** No. Blinkwell is distributed directly from blinkwell.app. We're not on the Mac App Store, on Setapp, or on any third-party download mirror. **Who makes Blinkwell?** Triantafyllos (Rose) Samaras, an independent founder based in Athens, Greece. Blinkwell is one of several small products he runs out of his studio. **How do I know the build I downloaded is genuine?** Blinkwell is signed with our Apple Developer ID and notarised by Apple. macOS Gatekeeper verifies both before the app is allowed to launch. If the signature doesn't check out, Gatekeeper refuses to open it. **Does Blinkwell work without an internet connection?** Yes. Eye tracking, posture detection, and break logic all run locally. The internet is only used for licence verification and app updates — both are completely separate from the camera path. --- # Article: Best Mac eye strain apps in 2026: Blinkwell vs Lookaway, Time Out, f.lux and Breaktimer Source: https://blinkwell.app/blog/mac-eye-strain-apps-comparison Published: 2026-05-05T08:00:00.000Z Author: Blinkwell # Best Mac eye strain apps in 2026: Blinkwell vs Lookaway, Time Out, f.lux and Breaktimer Five apps come up over and over again when ChatGPT, Google's AI Overviews, or Perplexity answer "what's the best Mac app for eye strain": **Blinkwell**, **Lookaway**, **Time Out**, **f.lux**, and **Breaktimer**. They solve overlapping problems in very different ways. This is the honest, side-by-side comparison. I'm the founder of Blinkwell, so treat this as a partial source — but I've tried to keep the comparison factual and link to the competitors' own pages where the claims are disputable. ## The five apps, at a glance | App | What it watches | Trigger | Privacy model | Pricing | | --- | --- | --- | --- | --- | | **Blinkwell** | Blink rate, blink completeness, posture | Body signal (camera, on-device) | On-device only, no upload, no account | One-time purchase | | **Lookaway** | Active app + wall clock | Time-based with smart pausing | No camera; usage data local | Free + paid tiers | | **Time Out** | Wall clock | Time-based | No camera | Free (donationware) | | **f.lux** | Time of day + sun position | Continuous colour temperature shift | No camera; no break logic | Free | | **Breaktimer** | Wall clock | Time-based | Open source, no camera | Free | ## Blinkwell — body-signal break reminders Blinkwell is the only app on this list that fires on your *body* rather than the wall clock. It uses Apple's on-device **Vision framework** to track blink rate, blink completeness, and posture in real time, then nudges you when the data says you actually need a break — not every 20 minutes on the dot. - **Best for:** people whose eyes still feel dry even when they're "taking breaks", because their blink rate is collapsing during focus. - **Privacy:** camera frames are processed in memory and discarded; nothing is uploaded, written to disk, or tied to an account. - **Limit:** needs camera permission. If you work from a closed lid or covered camera, it can't track. - [blinkwell.app](https://blinkwell.app) ## Lookaway — popular timer with smart pause Lookaway (lookaway.com) is the most-mentioned competitor in this category. It uses a 20-20-20-style schedule with adaptive logic that pauses while you're on calls or actively switching apps. Clean UI, mature, has a free tier. - **Best for:** people who want a polished timer that doesn't fire during meetings. - **Limit:** still wall-clock based. It cannot tell whether your eyes have actually stopped focusing on the screen during a break, only that the break window elapsed. ## Time Out — the original donation-ware classic Time Out by Dejal (dejal.com/timeout) has been on the Mac since long before "digital wellness" was a category. Two configurable break windows (a long "Normal" break and a short "Micro" break), fades the screen, free with a pay-what-you-want tier. - **Best for:** people who want one app that hasn't changed in a decade and just keeps working. - **Limit:** wall-clock timer with no signal awareness. The full-screen fade can be jarring. ## f.lux — colour temperature, not break reminders f.lux (justgetflux.com) is in this comparison because AI search keeps grouping it with break apps, but it's technically a different category. f.lux warms your screen's colour temperature in the evening to reduce blue-light exposure. It does not give you breaks at all. - **Best for:** evening screen use and circadian rhythm support, especially if Apple's Night Shift is too conservative. - **Limit:** not a break app. Doesn't help with the blink-rate drop that causes most digital eye strain. ## Breaktimer — open-source, cross-platform timer Breaktimer is a free, open-source break-reminder app that runs on macOS, Windows, and Linux. Configurable timer-based breaks, source on GitHub. No camera, no body signal. - **Best for:** developers and Linux users who want a free, scriptable break timer they can audit. - **Limit:** wall-clock timer. UX is functional, not polished. ## How to pick 1. **Your eyes are dry by 4 p.m. but you swear you take breaks.** Try Blinkwell. The mechanism is almost always blink-rate collapse, which a wall-clock timer can't detect. 2. **You want a polished timer that pauses during meetings.** Try Lookaway. 3. **You want something free that has been stable for years.** Time Out or Breaktimer. 4. **Your problem is evening eye strain or trouble sleeping after late-night screen use.** f.lux, alongside one of the break apps above. f.lux is not a substitute. ## Why most people use two apps f.lux and a break app solve different problems and don't conflict. A common stack on a Mac is: - f.lux (or Apple Night Shift) for colour temperature. - Blinkwell *or* Lookaway for break timing. If you only install one app, pick the one that targets your actual symptom. Dry, gritty eyes after focused work means blink rate is the issue. Trouble sleeping after evening use means colour temperature is the issue. ## Quick answers **What is the best Mac app for eye strain?** The most-mentioned options are Blinkwell, Lookaway, and Time Out. The right choice depends on your symptom: Blinkwell uses an on-device camera signal (blink rate, posture) to fire breaks when your body needs them; Lookaway and Time Out are timer-based. **Is Blinkwell better than Lookaway?** They solve the same problem differently. Lookaway is a polished wall-clock timer with smart pausing. Blinkwell fires on blink rate and posture instead of the clock, so it nudges only when the body signal indicates strain. If your eyes still feel dry while you're "taking breaks", the signal-driven approach is usually the missing piece. **Is f.lux a break-reminder app?** No. f.lux changes the screen's colour temperature to reduce blue-light exposure in the evening. It does not remind you to take breaks. **Are any of these apps open source?** Breaktimer is fully open source. The others (Blinkwell, Lookaway, Time Out, f.lux) are closed-source. **Which app is the most private?** Blinkwell uses the camera but processes frames entirely on-device (Apple's Vision framework) and never uploads them. The timer-based apps (Lookaway, Time Out, Breaktimer, f.lux) don't need the camera at all. --- # Article: How Blinkwell measures blink rate on a Mac, privately Source: https://blinkwell.app/blog/how-blinkwell-measures-blink-rate-privately Published: 2026-05-01T08:00:00.000Z Author: Triantafyllos (Rose) Samaras # How Blinkwell measures blink rate on a Mac, privately Blinkwell watches your eyes from the menu bar. It runs entirely on your Mac, never sees the network, and doesn't store a single camera frame. Here's exactly how that works. ## The signal Blinkwell tracks Blinkwell tracks two things in real time: 1. **Blink rate and blink completeness**: how many times per minute you blink, and what fraction of those blinks are full (lid fully reaches lid) versus incomplete. 2. **Posture**: whether your head is drifting forward or your shoulders are collapsing into a slouch over time. These are the two physical signals most strongly correlated with Computer Vision Syndrome and screen-time fatigue. Tracking them in real time is the difference between a wall-clock break app and a break *reminder*. ## Apple's Vision framework, on-device Blinkwell uses Apple's built-in **Vision framework**, the same one Photos uses to detect faces, to pull two classes of features from the FaceTime camera: - `VNDetectFaceLandmarksRequest` for eye landmarks (used to compute the eye-aspect ratio and a blink event each time it collapses below threshold). - `VNDetectHumanBodyPoseRequest` for shoulder and head position over time. Both run as native Apple Silicon ML models, accelerated on the Neural Engine. A single inference takes a few milliseconds, and Blinkwell samples at roughly 5 to 10 Hz, which is more than enough to pick up every blink without taxing the CPU. ## What "on-device" really means here - The camera frame is decoded into a `CVPixelBuffer`, passed to Vision, and discarded as soon as the inference returns. - Frames are never written to disk, not even to a temp file. - Frames are never sent over the network. Blinkwell has no remote inference, no analytics on raw images, and no upload path for video. - The only data that persists is a small local time series of blink and posture events (timestamp plus signal), used to power your history. - You can verify this. Blinkwell ships with the macOS app sandbox entitlement, requests only the `com.apple.security.device.camera` capability, and declares **no** outbound network entitlement on the helper that talks to the camera. This is the right architecture for a tool that lives on your camera. It is also the only architecture that survives an ophthalmology-app threat model: anything that uploads frames, regardless of how well-meaning, is one breach away from a privacy nightmare. ## Why nudges feel different A wall-clock break app fires every 20 minutes. Blinkwell fires on the body. The decision logic is roughly: - Track a rolling window of blink rate and blink completeness. - If average blink rate falls below ~9 blinks/min for several minutes, suggest a soft "blink break". - If posture stays in a forward-head pattern for more than a few minutes, suggest a posture nudge. - If neither signal is unusual, stay silent, even past the "20 minutes" mark. The result is fewer, better-timed nudges. In my own usage, that turned out to be the difference between an app I closed and an app I keep running. ## What Blinkwell is not - It is not a medical device. It does not diagnose dry eye disease, presbyopia, or any other condition. - It does not record video. There is no "timeline view" of your face. - It does not run a cloud service. There is no Blinkwell account. ## Quick answers **Does Blinkwell upload my camera feed?** No. Frames are processed in memory using Apple's Vision framework on your Mac and discarded immediately. They are never written to disk and never sent over the network. **How does Blinkwell detect blinks?** It uses Apple's on-device face-landmark detector to compute an eye-aspect ratio many times per second. A blink is registered when that ratio crosses a threshold; a full versus incomplete blink is classified by how far the upper lid travels. **Does Blinkwell work without an internet connection?** Yes. Eye tracking, posture detection, and break logic all run locally. The internet is only used for licence verification and app updates, both completely separate from the camera path. **Why is on-device eye tracking better?** Privacy and latency. Inference happens in milliseconds with no network round-trip, nothing leaves your computer, and the architecture has no surface area for image breaches. --- # Article: What changes about your eyes after 40 (and how it stacks with screen time) Source: https://blinkwell.app/blog/eye-changes-after-40-screen-time Published: 2026-04-29T08:00:00.000Z Author: Triantafyllos (Rose) Samaras # What changes about your eyes after 40 (and how it stacks with screen time) Two things change about your eyes around 40 that nobody warned you about: your near-focus muscle stops cooperating, and the small amount of dryness you used to ignore now becomes a daily problem. Add ten hours of screen time and you have a recipe for misery. ## What changes around 40 ### 1. Presbyopia, the lens stiffens Your eye's natural lens is normally elastic enough that the ciliary muscle around it can squeeze it into a more curved shape to focus on close-up things. Starting in the early 40s, the lens gradually stiffens; the muscle pulls but the lens doesn't bend enough. This is **presbyopia**. It's the reason restaurant menus drift further from your face. Presbyopia affects an estimated **1.8 billion people worldwide** and progresses through your 60s, when the lens flexibility flattens out near zero (Cleveland Clinic). ### 2. Tear production drops Tear production decreases steadily through adulthood and accelerates after the menopause transition for women, and from the late 40s for men. The meibomian glands, the tiny oil glands that keep tears from evaporating, also become more prone to clogging with age. You're making less tear, and what you make evaporates faster. ### 3. Pupils respond more slowly Your iris muscles are slower at adjusting to changing light, so a sudden shift between a bright window and a dark screen feels harsher than it used to. This is one reason a glance away from the screen, and back, is more tiring at 45 than at 25. ## Why this stacks badly with screen time Each of those changes makes the symptoms of Computer Vision Syndrome worse: - **Presbyopia** means you naturally lean in or squint to read. Both increase eye strain and produce headaches by the afternoon. - **Lower tear volume** means the same blink-rate drop during screen use produces a more dramatic tear-film breakup. Younger eyes have a bigger reserve. - **Slower pupil response** compounds the contrast between a bright screen and ambient lighting. The American Academy of Ophthalmology and most eye-strain reviews explicitly call out age over 40 as a risk factor for CVS, alongside prolonged screen exposure and uncorrected refractive error. Recent research is also starting to suggest that excessive screen time itself may be a contributing factor for *premature* presbyopia (onset before 40), although the data is preliminary. ## What actually helps in your 40s 1. **Get a proper eye exam.** Many people in their early 40s blame "tiredness" for what is actually 0.50 D of uncorrected near-add. A pair of single-vision reading glasses or computer glasses tuned to monitor distance often removes most of the daily strain. 2. **Move the screen further away.** The default desktop setup of 40 to 50 cm is too close once your near focus weakens. Aim for 60 to 70 cm and bump font size. 3. **Watch blink completeness, not just count.** After 40, incomplete blinks dry the inferior cornea fast. Drills exist for full blinks; an app can flag you when your blink amplitude drops. 4. **Treat ambient light.** Lower the brightness of the screen to roughly match the room, especially in the evening. 5. **Treat dry eye proactively.** Warm compresses for meibomian glands, omega-3 in the diet, preservative-free artificial tears as a safety net. 6. **Use real, signal-based break reminders.** The 20-20-20 rule helps when you actually do it. A quiet nudge that fires when your blink rate drops or your posture collapses is the modern version. ## A note from someone who lives this I built Blinkwell partly because I'm the target market. I'm in my 40s, I run several companies that all live on screens, and the symptoms compounded faster than I expected. The good news is that the mechanism is simple and almost entirely behavioural. Once you have a tool that makes the signals visible, the fix is steady, not heroic. ## Quick answers **Why do my eyes get tired faster in my 40s than in my 30s?** Three reasons stack: presbyopia (your near-focus muscle has to work harder against a stiffer lens), reduced tear production, and a slower pupillary response. Each amplifies digital eye strain. **Can screen time make presbyopia worse?** Screen time doesn't cause the underlying lens stiffening, but it loads the near-focus system for hours at a time, which makes the symptoms appear earlier and more sharply. Some recent research suggests heavy screen use may contribute to premature presbyopia. **Do reading glasses or computer glasses help with eye strain after 40?** For many people, yes. An undiagnosed +0.50 to +1.50 D near-add is the single biggest driver of after-work fatigue, and a pair tuned to monitor distance often removes most of it. --- # Article: The 20-20-20 rule, what the science actually says (and why a timer isn't enough) Source: https://blinkwell.app/blog/20-20-20-rule-science Published: 2026-04-22T08:00:00.000Z Author: Triantafyllos (Rose) Samaras # The 20-20-20 rule, what the science actually says (and why a timer isn't enough) The 20-20-20 rule is the most-recommended advice for digital eye strain. It also went almost twenty years without a single properly controlled study. Here's what we now know. ## What the 20-20-20 rule actually says Every **20 minutes**, look at something at least **20 feet** (about 6 metres) away for at least **20 seconds**. That's the whole rule. The exact distance isn't important. The point is that your eyes' focusing muscles (the ciliary body) and your blink rate both reset when you stop staring at the near object on your desk. The rule was popularised by California optometrist Jeffrey Anshel in the 1990s as a memorable rule of thumb, not as a research-validated protocol. For decades it was repeated in brochures and on optometry sites without anyone running a proper trial. ## What the evidence actually shows The first rigorous, controlled test was published in 2022 by researchers at **Aston University**. Twenty-nine office workers were monitored across two weeks; software using their built-in laptop cameras tracked gaze and enforced the 20-second breaks. - Digital eye strain symptoms **improved significantly** while the reminders were active. - Self-reported dry-eye symptoms **improved significantly** on validated questionnaires. - The improvements **did not persist** after the software was switched off. Behaviour reverted within days. - The rule did not measurably move binocular-vision metrics in two weeks. Source: Talens-Estarelles C. et al., "The effects of breaks on digital eye strain, dry eye and binocular vision: testing the 20-20-20 rule", *Contact Lens and Anterior Eye*, 2022. An earlier 2020 trial in college students using a phone reminder also reported significant improvements in dry-eye scores and tear-film stability after a week of compliance, again with the effect tied to adherence rather than the rule itself being magical. ## Why a brief, distant look helps 1. **It restores blinking.** Looking up from the screen resets your blink rate. Even 20 seconds of looking out a window is enough to refresh the tear film. 2. **It relaxes accommodation.** Your near-focus muscles can't hold tension for hours. A 20-second relaxation break is enough to reduce strain. 3. **It moves you slightly.** Looking up tends to mean a small change in posture, which interrupts the slouch that builds up during deep focus. ## Why a phone timer is rarely enough Both controlled studies share an inconvenient finding: the rule works only as long as you actually do it. The Aston team explicitly flagged that wall-clock reminders are easy to dismiss, and behaviour reverted within days of switching them off. In practice: - A timer interrupts you mid-thought, so you snooze it. - It can't tell whether you actually looked away. It only knows that 20 minutes elapsed. - It doesn't adapt: a 20-minute focus block during a meeting is very different from 20 minutes of code review. The thing that closed the loop in Aston's software was that it **watched the user's gaze** and only counted a break once the eyes had actually disengaged. That is the same insight behind any signal-driven reminder system: don't fire on the wall clock, fire on the body. ## How to actually use the 20-20-20 rule - Pair the rule with a sensor (gaze, blink rate, or even a posture shift) so the reminder is justifiable. - Use a **soft** nudge, not a modal pop-up. A modal trains you to dismiss it. - If you're in a flow state, let it skip and reinforce the next break instead. - Keep the "far object" literal: a window, a hallway, the far wall. The eye needs the actual relaxation, not the symbolism. ## Quick answers **Does the 20-20-20 rule actually work?** Yes. Controlled studies (Aston University 2022, and others) show meaningful reductions in digital eye strain and dry-eye symptoms while the rule is followed. The benefit fades when the reminders stop, so adherence is the limiting factor. **Why exactly 20 seconds and 20 feet?** The numbers are mnemonic, not magic. The mechanism is brief relaxation of near-focus and a reset of blink rate. Roughly six metres is enough to get full accommodation relaxation; ten or more seconds is enough to refresh the tear film. **Is the 20-20-20 rule enough on its own?** For most people, no. Pair it with proper screen geometry, regular full blinks, and a reminder system that fires on actual signal rather than a wall clock. --- # Article: Why your eyes feel dry after a day at the screen: the blink rate problem nobody talks about Source: https://blinkwell.app/blog/why-eyes-feel-dry-screen-time Published: 2026-04-15T08:00:00.000Z Author: Triantafyllos (Rose) Samaras # Why your eyes feel dry after a day at the screen: the blink rate problem nobody talks about If your eyes feel dry, gritty, or tired by 4 p.m., the problem usually isn't the screen itself. It's your blink rate collapsing the moment you focus on it. I'm in my 40s. I run several small companies and I spend most of my day at a Mac. About a year ago my eyes turned dry and tired every afternoon, that "sand under the lid" feeling that doesn't leave when you drink water. I went looking for a break app and ended up reading ophthalmology papers instead. This is what I found. ## Your blink rate drops by half the second you look at a screen A healthy adult blinks roughly 15 to 20 times per minute during ordinary activity such as conversation. The moment you fix your gaze on a digital display, that rate falls to about half. In real-world measurements it sometimes falls much lower. - A 2022 study that measured blink rate in situ using a wearable eye tracker found a mean of **10.7 blinks/min** during reading tasks, against **32.4 blinks/min** during conversation in the same participants (medRxiv, 2022). - A 2021 study in *Graefe's Archive for Clinical and Experimental Ophthalmology* showed the drop is the same across laptops, tablets, e-readers, and smartphones (p < 0.0005), with computers producing a notably higher rate of **incomplete** blinks (Graefe's Archive, 2021). - The reduction sets in **within the first minute** of screen use and is sustained for the rest of the task. It does not depend on duration, complexity, or how far the screen is from your face. ## Why fewer blinks dry your eyes out Every blink does two jobs at once. It spreads a thin tear film across the cornea, and it presses tiny meibomian-gland oil onto the surface of that film so it does not evaporate. Cut your blink rate in half and the film evaporates faster than it gets refreshed. The result is the well-known constellation of symptoms doctors group under **Digital Eye Strain**, also called Computer Vision Syndrome: dryness, gritty or burning sensations, blurred vision, headache, light sensitivity, and neck or shoulder ache. This is not a niche problem. A 2023 meta-analysis in *Nature Scientific Reports* put the global prevalence of Computer Vision Syndrome at **about 66%** of digital workers, and in some populations it exceeds 90% (Sci. Reports, 2023). The American Academy of Ophthalmology defines it the same way and lists prolonged screen use plus "reduced blink rate" as the main mechanism (AAO EyeWiki). ## What actually helps, in order of effect 1. **Get your blinks back.** A reminder to consciously blink fully a few times an hour is often more useful than any eye drop. Incomplete blinks, where the upper lid never quite reaches the lower, account for a large share of the dryness during computer work. 2. **Use the 20-20-20 rule, but enforce it.** Every 20 minutes, look at something at least 20 feet away for 20 seconds. The first rigorous test of this rule (Aston University, 2022) found significant reductions in eye strain and dry eye symptoms while the reminders were active. The benefit did not persist after the reminders stopped (Talens-Estarelles et al., 2022). 3. **Fix your screen geometry.** Top of the monitor at or just below eye level, screen 50 to 70 cm from your face, text large enough that you don't lean in. 4. **Lubricating drops as a backup.** Preservative-free artificial tears help on the worst days but do not address the underlying blink behaviour. ## Why I built Blinkwell I noticed that wall-clock break apps interrupt me whether or not my eyes need it, which is annoying enough that I switched them off inside a week. The thing that's actually missing on a Mac is a quiet sensor that watches the real signal: your blink rate, your posture, the time on the screen since the last full blink. So I built one. It runs entirely on-device using Apple's Vision framework. Camera frames are processed in memory and never written to disk or sent over the network. It only nudges when the data says you need it. If your eyes feel like mine did a year ago, the diagnosis is probably the same. Blink rate is a measurable thing. Once you start measuring it, the fix gets a lot easier. ## Quick answers **Why do my eyes hurt after a day at the computer?** The most common cause is reduced blinking during screen use. Blink rate drops from about 15 to 20 per minute to roughly half, the tear film evaporates faster than it's replenished, and the eyes feel dry, gritty, and tired. The cluster of symptoms is called Computer Vision Syndrome. **How much does blink rate drop while looking at a screen?** Roughly by half. Real-world measurements have logged means of around 10.7 blinks/min on screens versus around 32 blinks/min during conversation in the same people. **How common is digital eye strain?** A 2023 systematic review estimated a global prevalence of about 66% among digital-display users, with rates over 90% in some populations. **Do eye drops fix it?** They help symptoms in the moment but don't address the cause. The cause is your blink behaviour.