Hi Product Hunt, I'm LiWen. I built NoFlake, a free iPhone app for keeping your workout promises.

I kept flaking on my runs. Checking a box myself never worked for me, and betting money felt like punishment. What worked was a friend seeing the proof.

Here's how NoFlake works:

Make a specific promise, like completing one 5K run by Sunday.
NoFlake checks a matching Apple Health workout against your goal and deadline.
Invite friends to join, see who followed through, and share the results.

You can also make meetup promises and confirm arrival without sharing your live location with friends.

It's free, with no subscriptions or in-app purchases. Sign in with Apple is required; workout verification uses Apple Health access.

Try it with one promise for your next workout: Download NoFlake for iPhone.

Would you start with a solo workout promise or invite a friend? I'd love to know why.