Check https://banglejs.com, the hw of the banglejs2 is exactly like an amazfit bip (which is great) but the firmware is open and programmable in js. Fyi the screen is transflective, which makes smartwatchces perfectly readable under sunlight without turning it on, like e-paper. It's just lower in resolution bit it will last 30days without charging it.
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That's so cool. And I have never heard of it. And it even has the rex game.
Iirc the only minor problem is with waterproof. But it's enough to close a hole which is used for the barometer (or another minor sensor, not sure which one) and it becomes waterproof.
I bought a sealed device, with the intention of doing development but have not yet done anything like that
I installed GadgetBridge on my Android phone, paired it with the watch, uploaded the latest PineTime firmware, all without looking at code or opening it up or anything
It works perfectly fine as a basic watch with step counter and heart-rate monitor (although, I am not sure how accurate these features are)
If you can browse the web, download files, and find that file again when using a different app, then I think you'll be fine
I have a pinetime. Like basically every other Pine64 project (except the pinebuds, which are good, not great), it's lousy as a daily-use device and only of interest if you want to hack on an embedded device.
Might I ask why?
Specific to the pinetime, the biggest flaw to me is the screen. It's illegible in sunlight, and turns completely off when the watch is idle, so it's really bad at .... telling time. Beyond that, the watch faces and functions are extremely limited. Compared to the $20 Wyze Watch and the MiBands, it's practically stone-age.