Local businessEasy1 to 2 weekendsUnder $100Web app

Key Ledger

Property managers track who has which key, when it went out and when it is due.

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The idea

Small property managers and cleaning companies lose track of physical keys and fobs. Key Ledger gives each key a tag number, logs every check out and return with a signature, and flags keys that are overdue. It replaces clipboards and guesswork.

Who it is for
Small property managers, cleaning and maintenance companies
How it makes money
Monthly subscription
Suggested stack
Next.js, MySQL, Tailwind, hosted on a small VPS
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 web app called Key Ledger. Start with login and a Keys page where each key has tag number, property address, unit, key type (door, mailbox, fob, gate) and number of copies.

PROMPT 2 OF 3

Add check out and return flows: pick a key, pick or add a person (name, company, phone), set a due date, capture a signature on screen, and save a log entry. Show a list of keys currently out with overdue ones in red and a full history per key.

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PROMPT 3 OF 3

Send email reminders for overdue keys to the person and the manager, add printable QR tags for each key that open its page when scanned, and add Stripe billing by number of properties.

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