5 CHALLENGE APP IDEAS TO START WITH YOUR FRIENDS THIS WEEK.

Not sure what to challenge your friends to? These five challenge app ideas are proven to be fun, competitive, and hard enough to separate those who show up from those who don't.

1. COLD SHOWER

Cold shower every morning, minimum 2 minutes. Photo proof showing the shower running. This is the OG Doin' challenge — simple, brutal, and impossible to fake. Day 1 is uncomfortable. Day 7 you don't want to stop.

Stakes idea: Loser buys coffee for a month.

2. SUNRISE RUN

Run before 7am every day. Screenshot of the run tracker showing time and start time, or a photo of the sunrise mid-run. This challenge is impossible to fake and impossible to forget. Nobody who finishes a 7-day sunrise run challenge stops talking about it.

Stakes idea: Loser does 100 burpees on video.

3. NO ULTRA-PROCESSED FOOD

Zero ultra-processed food for 7 days. Photo proof of every meal. This one exposes how much junk is quietly in the diet — and how easy it is to replace once you're being watched. Harder than it sounds. Which makes finishing feel better.

Stakes idea: Loser cooks a proper dinner for the group.

4. DAILY WRITING

500 words every day. Screenshot of the word count, or a photo of the handwritten page. The first three days are slow. Day 4 the writing starts coming on its own. This challenge builds more than output — it builds the proof that you can show up when it's not easy.

Stakes idea: Loser has to share their worst paragraph publicly.

5. DIGITAL DETOX

Zero social media for the entire day. Screen time screenshot showing zero usage on social apps. This challenge changes how you think about your phone — most people discover they were spending 3+ hours on apps they don't even enjoy.

Stakes idea: Loser gives their phone to a friend for a full day.

START NOW

Pick one. Send the link. The clock starts when they accept. Start Doin'.

Also read: Accountability app: why social proof works better than willpower.