The challenge app
for any audience.

One person issues a challenge. One link gets shared. Everyone who joins uploads one photo per day as proof. The challenge ends. Results lock permanently. That's it.

How it works

Doin' is time-boxed. Every challenge runs for 1, 7, 14, or 30 days. Each day, every participant uploads one photo as evidence — timestamped server-side, so you can't fake the time or back-date a submission. Miss a day and your streak breaks publicly on the leaderboard. No grace periods. No private failures.

When the challenge ends, the completion board locks. Every participant's result — who finished, who dropped — is permanently visible on their profile. Nobody can delete it. That permanence is the social pressure that drives completion. Willpower is finite. Public commitment is not.

For brands and companies

Brands pay for Doin' because it produces what passive social media cannot: daily, voluntary, public participation from a named audience. Every proof photo is authentic user-generated content. Participation analytics show exactly who showed up on each day, what the completion rate was, and where engagement dropped off.

Business features include white-label (your logo instead of Doin' branding), UGC photo gallery filtered by participant consent, CSV leaderboard export, and a signed Data Processing Agreement for GDPR compliance. Business tier starts at $299/month.

For creators and influencers

A creator shares one challenge link with their followers. Anyone who taps it can join — no app install required. Daily photo proof replaces the checkbox: you can see exactly who showed up, not just who clicked “done.” When the challenge locks, the creator can share the completion board to Stories. Creator tier is $19/month.

For friends and group chats

Share a link in your group chat. A 7-day cold shower challenge, a 30-day running streak, a 1-day bet between two people. Miss a day and your streak breaks publicly. The group pressure is the product. Stakes are social only — no money changes hands through the app. Free tier is permanently free.

Not a habit tracker

Habit trackers are solo productivity tools. They rely on individual motivation and self-reported data. A checkbox that only you see is easy to skip. Doin' is a social participation engine — the mechanism is visibility. Your group can see whether you showed up. That difference is why Doin' drives completion rates that solo apps cannot.

Availability and pricing

Doin' is available on iOS, Android, and as a mobile-responsive web app. Participants can join and upload proof from any device without installing anything — the challenge page works fully in any mobile browser.

Built and operated from Europe. All data stored in EU-West data centres. Users sign in with Google. We use your name and email to identify you on the leaderboard. We do not access any other Google data. See our Privacy Policy.