Pebble might be the best hackable. They’re discontinued, not sure how much used ones go for on eBay. But it was ahead of its time, I don’t think there was a wea

Pebble might be the best hackable. They’re discontinued, not sure how much used ones go for on eBay. But it was ahead of its time, I don’t think there was a wearable that useful until the Apple Watch. No cel, no gps, just the basics.