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PetsEasy1 to 2 weekendsUnder $100Mobile app

Tank Log

A water test and maintenance log for home aquarium keepers.

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The idea

Aquarium hobbyists log water test results, water changes and feedings for each tank. Charts show trends and reminders keep maintenance on schedule. It replaces the notebook next to the tank.

Who it is for
Freshwater and reef aquarium hobbyists
How it makes money
Freemium with paid multi-tank plan
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 mobile app called Tank Log. Users sign up and add tanks with name, volume, type (freshwater, planted, reef, brackish) and photo. Each tank has a list of livestock with species and date added.

PROMPT 2 OF 3

Add a test entry screen with fields for temperature, pH, ammonia, nitrite, nitrate, and for reef tanks also salinity, alkalinity, calcium and magnesium. Let users set their own target ranges and highlight readings outside them. Show a line chart per parameter.

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PROMPT 3 OF 3

Add maintenance tasks with intervals (water change, filter clean, glass clean) and push reminders. Add a shareable tank page. Add an in-app subscription for more than one tank.

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