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B2B toolsEasy1 to 2 weekendsUnder $100Web app

Renewal Radar

Track software subscriptions and get warned before anything auto-renews.

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The idea

Small companies list every paid tool with owner, cost and renewal date. The app emails the owner before each renewal and asks keep, downgrade or cancel. Nobody gets surprised by a yearly charge for a tool no one uses.

Who it is for
Office managers and finance leads at small companies
How it makes money
Monthly subscription per company
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 Renewal Radar. Create company signup and a subscriptions table with tool name, owner email, cost, billing cycle (monthly, yearly), renewal date, seats and notes. Allow CSV import.

PROMPT 2 OF 3

Send an email to the owner 30 and 7 days before each renewal with three buttons: keep, downgrade, cancel. Record the decision and the reason. Show upcoming renewals for the next 90 days on a timeline.

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PROMPT 3 OF 3

Add a spend dashboard with monthly and yearly totals, spend by department and a list of tools with no decision logged. Add a Stripe subscription with a free tier of ten tools.

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