According to a 2022 survey [2], the average US adult picks up their phone 352 times per day, or approximately once every 2m43s while they're awake.
On browsers that support it (iOS 16.4+, most versions of Android Chrome), it uses the Screen Wake Lock API [3] to keep the page open, and falls back to nosleep.js [4] otherwise. From testing on my iPhone 14 Pro Max running iOS 16.6, battery life only went down 3 or 4 percentage points after an hour with the wake lock.
Made this as a web app as a quick demo to be compatible across all mobile devices. As an app, we can probably save more on battery + not have the screen on. One caveat is that on iOS this will actually increase your Screen Time (although hopefully reduce your other category usage).
I currently only track time on page through Google Analytics 4. No other calls are made to a server, although if we actually wanted to verify that you kept the page open vs. javascript/inspector-system clock-fu, we could add a verified mode that pings the server every X minutes.
As a PWA, possibly due to an iOS/Mobile Safari quirk/bug [5], neither wake lock nor nosleep.js appear to work .
[1] https://news.ycombinator.com/item?id=2124106 [2] https://www.asurion.com/connect/news/tech-usage/ [3] https://developer.mozilla.org/en-US/docs/Web/API/Screen_Wake... [4] https://github.com/richtr/NoSleep.js [5] https://bugs.webkit.org/show_bug.cgi?id=254545
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