Now on Android

Replace porn
with exercise.

When the urge hits, Cairn makes you move first. Twenty push-ups, then it's your call. Your phone's camera counts every rep. You get jacked either way.

Get it on Google Play See how it works

7-day free trial. No account needed. Nothing leaves your phone.

Cairn intercepts the urge with a push-up prompt
01 The cycle

You've tried willpower. It doesn't work.

Blockers get uninstalled. Promises get broken. The urge comes back stronger. Cairn doesn't ask you to fight it. It redirects it.

  1. 01 You say "just five minutes." You lose half an hour.
  2. 02 You've installed blockers. You uninstalled them within a week.
  3. 03 The guilt afterwards feels worse than the urge before.
  4. 04 You've said "this is the last time" more times than you can count.
02 How Cairn works

Three steps. Zero willpower.

The urge doesn't disappear because you're locked out. It disappears because you physically exhausted it. Exercise releases dopamine naturally. You're not fighting the craving. You're replacing it.

STEP 01

Cairn catches it

When you head to a site you shouldn't, Cairn intercepts automatically. No walls. Just a challenge.

STEP 02

You move

Push-ups, squats, planks, or jumping jacks. Your camera counts every rep with AI pose detection.

STEP 03

You decide

We don't block you. You finish the set, then it's your call. You'll choose not to — the urge is already gone.

03 Why Cairn is different

Not a blocker. A redirector.

Every other app builds a wall. Cairn doesn't block you — it lets you choose. Twenty push-ups later, you'll choose not to. You get jacked regardless. That's the whole idea.

  • YESCamera counts real reps. No cheating.
  • YESIntercepts automatically when you open porn.
  • YESFour exercises: push-ups, squats, planks, jumping jacks.
  • YES100% on-device. Nothing recorded, ever.
  • NOAccounts, servers, or data collected.
  • NOAnalytics, tracking, or ads.
Real person doing push-ups with AI pose skeleton tracking overlay

On-device pose detection. Real reps. Real friction.

04 The app

Built like a field journal.

Dark, grounded, serious. No gimmicks. Just a clean tool that does one thing well.

Sound familiar onboarding
Home dashboard with streak
Exercise interception prompt
Track your streak day by day
05 Privacy

Your sensitive activity stays on your phone.

URLs, camera frames, exercise history, and commitment reasons stay on-device. Google Play and RevenueCat process subscription data, while Meta receives limited device identifiers and app/subscription events for ad measurement. None of those providers receives your URLs or camera content.

Read the full privacy policy →

Start your first stone today.

Seven days free. Then $8.99/month or $39.99/year. Cancel anytime.

Get it on Google Play

Android first. iOS is on the trail.