I'm looking for both wearable hardware and software for heart rate monitoring on linux. On wrist or chest strap is fine. Heart rate monitoring is essential. Oxygen saturation and ECG functionality would be nice too. I've got a better idea of what I **DON'T** want than what I do. I don't want anything that requires sync to a corporate server, I want to BUY a product, not BE one (optional syncing is fine, I can choose not to use it). I just want something that gathers data and either transmits it in real time to my bluetooth-paired desktop machine and/or android[1] device, or logs the data for later download. I'll also need software to display and/or analyse the data. I've seen lots of cheap devices on ebay for $10-$20 but have no idea if they can be made to work with linux or if they use their own proprietary protocols and only work with their spyware app. I'd prefer to avoid brand name equipment, because I see no good reason to pay $300 or $400 for hardware not significantly better than the stuff that sells for under $20 - especially when I explicitly do not want any "value added" cloud services they provide, services that get promoted as features but I see as spying malware. in short what i'm after is: * cheap * open source data acquisition, visualisation, & analysis * open data formats * no mandatory spyware service Any clues or pointers to relevant hardware or software would be appreciated. [1] i've found https://github.com/Freeyourgadget/Gadgetbridge (which is availabled on the F-Droid app store) so something compatible with that would be good. craig -- craig sanders <cas(a)taz.net.au>