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Tank Log playbook.

A water test and maintenance log for home aquarium keepers. Ten steps from claim to launch, with the exact prompts to paste into Claude, Cursor or Lovable.

Claim Tank Log to unlock every step

It is free. Enter your name and email and we will also email you a link to this playbook.

01

Claim your idea

1 minute
  • You have claimed Tank Log. Your claim is free and stays active while you keep building.
  • Bookmark this page. It is your personal playbook, and the link in your email always brings you back here.
  • Write one sentence on who you are building for and why. Start with: "Tank Log helps freshwater and reef aquarium hobbyists ..." You will reuse this sentence everywhere.
02

Domain and name

15 minutes
  • Decide if you will keep the name "Tank Log" or pick your own. Short, easy to spell and easy to say out loud beats clever.
  • Check if these domains are free at your registrar (for example Porkbun, Namecheap or Cloudflare): tanklog.com, gettanklog.com, tanklogapp.com, tankloghq.com, trytanklog.com, tankly.com.
  • Buy the .com if you can. Expect about $10 to $15 per year.
  • Grab the same name on Instagram, X and TikTok, even if you will not post yet.
AI PROMPT

Suggest 15 short, memorable brand names for an app that does this: A water test and maintenance log for home aquarium keepers. It is for Freshwater and reef aquarium hobbyists. For each name, give a matching .com domain idea and one sentence on why it works. Avoid names of existing well known companies.

03

Trademark basics

30 minutes
  • Search the official US trademark database (tmsearch.uspto.gov) for your name, and also search Google and the app stores for apps with the same or a similar name.
  • If a similar name already exists for similar software, pick a different name now. Changing it later is expensive.
  • Filing your own trademark is optional at the start. Many founders file once they have paying customers. This is general information, not legal advice, so talk to a trademark attorney before filing.
04

AI build kickoff

20 to 40 minutes
  • Open your AI coding tool (Claude, Cursor or Lovable) and start a new project called Tank Log.
  • Paste the prompt below exactly as written. Let the AI finish, then run the app and click through every screen.
  • If something breaks, copy the full error message back to the AI and ask it to fix it. Repeat until it works.
  • Suggested stack: Expo (React Native), Supabase for login and data. You can tell the AI to use it, or let it choose.
AI 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.

05

Server and hosting

30 to 60 minutes
  • For the mobile app, use Expo so the same code runs on iPhone and Android. Test on your own phone with the Expo Go app while you build.
  • Create a free Supabase project for logins and your database, then paste its URL and key into your app settings (never into public code).
  • Put your code on GitHub so you never lose it and can deploy with one click.
AI PROMPT

My app Tank Log is built with Expo (React Native), Supabase for login and data. Walk me step by step through putting it online: creating accounts, environment variables, connecting my GitHub repo, connecting my domain, and turning on HTTPS. Assume I am a beginner and explain each click.

06

Backend and data

1 to 3 hours
  • Now build the core feature. Paste the prompt below into the same project so the AI keeps the context.
  • After it runs, test it with real looking data. Try it the way a customer would, including mistakes like empty fields.
  • Ask the AI to add basic checks: required fields, friendly error messages, and nobody seeing another user's data.
AI 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.

07

Frontend and design

1 to 3 hours
  • Make it feel like a real product. First paste the design prompt, then the feature prompt below it.
  • Pick one brand color and one font and stick with them everywhere.
  • Show it to 3 people who match your customer and watch them use it without helping. Fix whatever confuses them.
AI PROMPT 3 OF 3

Redesign every screen of Tank Log so it looks clean, modern and trustworthy for Freshwater and reef aquarium hobbyists. Use one brand color, generous spacing, clear buttons, and make it work well on phones. Add a simple logo using the name Tank Log.

AI 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.

08

Go live

1 day
  • For the app stores: build with Expo EAS, then create developer accounts. Apple charges $99 per year and Google Play charges a one time $25. Store review can take a few days, so submit early.
  • Add a privacy policy and terms page. Your AI tool can draft them, and app stores require a privacy policy.
  • Set up simple analytics so you can see visits and sign ups.
AI PROMPT

Write a checklist to launch Tank Log (mobile) with everything I might forget: domain, HTTPS, privacy policy, terms, analytics, error monitoring, backups, and App Store and Google Play submission, a support email.

09

Marketing plan

Week 1
  • Your first customers: Freshwater and reef aquarium hobbyists. List 20 real people or businesses that fit, and message them one by one. Ask for 10 minutes of feedback, not a sale.
  • How it makes money: Freemium with paid multi-tank plan. Put the price on your site from day one, even if you offer a free trial.
  • Post where your customers already spend time: local Facebook groups, Reddit communities, industry forums, and LinkedIn.
  • Launch on Product Hunt and relevant subreddits once 5 real users have tried it.
AI PROMPT

Write a launch plan for Tank Log, which a water test and maintenance log for home aquarium keepers. The target customer is Freshwater and reef aquarium hobbyists. Include: where to find the first 100 users, 3 short launch posts, a cold message template, and a simple pricing page headline.

10

Launch and grow

Ongoing
  • Expected launch cost: under $100. Keep costs low until people are paying.
  • Talk to every early user. Ask what almost stopped them from signing up, and fix that first.
  • When your site is live, reply to your Zweegs claim email with your link and we will add the Shipped badge to your idea.
  • Stuck on any step? You can hire a builder to finish it from the Build it for me page.

Stuck on a step?

Have our team finish it for you, or post the job on Megalancer.

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