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Home and familyEasy1 weekendUnder $100Mobile appWeekend build

Size Keeper

Keep your kids' current clothing and shoe sizes where grandparents can see them.

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The idea

Parents record each child's current sizes for clothes, shoes and more, plus favorite colors and things they already have. Relatives open a shared link before buying gifts. It stops the pile of gifts that do not fit.

Who it is for
Parents with relatives who buy clothes and gifts
How it makes money
Free, with a $3 one time unlock for multiple kids and relative sharing
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 a mobile app called Size Keeper. The parent signs up and adds children by nickname. Each child has a size card with fields: shirt, pants, dress, shoes, pajamas, coat, hat, and a notes field for favorite colors and characters.

PROMPT 2 OF 3

Record the date each size was updated and show a gentle prompt to recheck sizes older than three months. Add a have enough list (for example, no more socks) and a wish list with links. Keep a size history so parents can see growth over time.

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PROMPT 3 OF 3

Generate a read only share link that relatives can open in a browser without an account. Notify linked relatives when sizes change. Add a one-time in-app purchase for sharing and multiple children.

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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 Size KeeperEvery step spelled out for this idea, with the exact prompts to paste into your AI.
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