There are the nordic nrf52xxx based btle smartwatches for <$30, search 'smartwatch P8' for example.
The firmware can be replaced with your own.
The battery won't last a year though.
The firmware can be replaced with your own.
The battery won't last a year though.
Is that a different model? Is the website defunct?
on closer inspection, it does say 'out of stock'
Do you care to comment on the smartwatch features or health monitoring one?
I remember there is now basically rebranded Bip with different firmware sold under different name (Bangle.js 2 or some other unknown chinese models), but nothing improved in last few years for low price in compact body. Everything else like those Casio or Garmin watch with good displays and battery life or LILYGO TTGO T-Watch-2020 are like 15mm, more than 50% ticker than original Bip.
I like Bip so much that when it failed (because of a design flaw fixed in Lite and later Bip models), I bought Bip Lite (since I never used Bip's GPS, always using the phone's instead).
I have a colmi P8 and it was easy to get wasp-os uploaded and now have micropython available with direct connection into the watch!
Battery life is really only 24-48hrs if you don’t do anything heavy.
Sometimes I wonder how more useful it is than my apple watch.