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Mobile appsEasy1 to 2 weekendsUnder $100Mobile app

Chain Check

Cyclists track miles per bike and get told when parts need a look.

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The idea

Regular riders lose track of when they last lubed the chain, swapped tires or had a tune up. This app keeps a mileage count for each bike and reminds you when a part hits the interval you set.

Who it is for
Commuters and weekend riders with one or more bikes
How it makes money
Small yearly subscription
Suggested stack
Expo (React Native), Supabase for login and data
Launch cost
Under $100

Your first AI prompts

Paste these into Claude, Cursor or Lovable, in order. Check that each one works before moving on.

PROMPT 1 OF 3

Build an Expo app called Chain Check. Start with a Bikes screen where the rider adds each bike with name, photo and starting mileage.

PROMPT 2 OF 3

Add a ride log where the rider types miles or taps quick buttons for common rides. Add parts per bike (chain, tires, brake pads, cables) with a check interval in miles and a last serviced mileage, and show a colored status for each part.

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PROMPT 3 OF 3

Add local notifications when a part passes its interval, a service history list per bike, and a yearly subscription that unlocks multiple bikes and a CSV export.

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The 10 step playbook

  1. 01Claim your ideaPut your name on it and unlock every prompt and the full playbook. Always free.
  2. 02Domain and nameBrainstorm a short name, check the .com, and register it.
  3. 03Trademark basicsSearch for conflicts before you fall in love with the name.
  4. 04AI build kickoffPaste the prompts below into Claude, Cursor or Lovable, one at a time.
  5. 05Server and hostingPick a host and have your AI walk you through setup.
  6. 06Backend and dataLogins, database and payments, one prompt at a time.
  7. 07Frontend and designScreens, colors and a simple logo that look professional.
  8. 08Go livePut it online, then submit to the App Store and Google Play if it is a mobile app.
  9. 09Marketing planLaunch posts, local outreach and your first 100 users.
  10. 10Launch and growShip it and add your live link to earn the Shipped badge.
Your full playbook for Chain CheckEvery step spelled out for this idea, with the exact prompts to paste into your AI.
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