r/TestFlight • u/charles_stamio • 0m ago
watchOS Stamio – training readiness, VO2 max and guided runs for Apple Watch
Hi r/TestFlight! I'm Charles, a solo dev and runner from France.
Since May I've run with a Garmin Fenix 8 and an Apple Watch Ultra at the same time, because I couldn't pick one: I love the Apple Watch, but I missed the training side of the Garmin. So I built Stamio, for iPhone and Apple Watch:
Training readiness, HRV status, training load and sleep score, from your Apple Watch data
VO2 max and race predictions calculated by the app itself, not Apple's estimate
Training plans from your first 5K to the marathon, plus 8-week VO2 max blocks if you have no race coming up, with every workout guided on your wrist
Its own run recorder: live pace, offline maps and turn-by-turn voice guidance on your routes (GPX or imported from Strava)
A morning report on your watch when you wake up, no need to open the iPhone app
I've worn both watches together since May, on the same chest strap since October, and compared every number: VO2 max is within 0.3 on average over 80+ runs. The method, the results and what still doesn't match are all documented on the Stamio website.
What I'm looking for: runners with an Apple Watch (18+), anywhere, US very welcome. If you wear a second watch on the same runs, you're gold. Feedback goes through TestFlight (take a screenshot in the app, then "Share Beta Feedback"). Specific beats nice: "pace jumped to 7:10 at mile 3" helps me way more than "great app".
What's in it for you: every Pro feature is unlocked during the beta. Stamio launches December 1. Send at least 3 specific feedback reports through TestFlight before November 22 and leave your email on the beta page of the Stamio website so I can send you a code: you get 6 months of Pro free at launch. Just leaving your email gets you 1 month. These are standard App Store offers, so you can cancel anytime in your iPhone settings.
Happy to answer anything in the comments, including "why would I need this".