A classroom aquarium that grows with every reward

Every student gets a fish. Tap it to reward good work and it eats, grows and climbs the leaderboard. Put it on your classroom screen and watch the whole class cheer.

Get started free See how it works

Free for teachers. No student accounts, no ads.

Ava

Leo

Mia

Up and running in two minutes

Made for the classroom screen, with your phone as a remote.

Create your classroom

Add your students

Type first names or import a class list from Excel. Each student picks a fish and a color.

Reward and watch them grow

Tap a fish (or use your phone) and food drops in. The fish swims over, eats and gets a little bigger.

Everything a classroom needs

Simple enough for second graders to love, with the controls a teacher wants.

🏆

Daily leaderboard

Gold, silver and bronze crowns for the top three. Look back at any day, or the last 7 days.

🌙

Fresh start every day

At 23:59 in your time zone every fish goes back to its starting size. The history stays on the leaderboard.

📱

Your phone is the remote

🏰

Decorate the tank

Castles, coral, treasure chests and more. Drag, resize and layer them, or upload your own background.

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Top fish zone

Draw a line in the tank: only your top fish get to swim above it. A simple goal everyone can see.

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Make it yours

Set how big fish can grow, how many feeds it takes, swim speed, Sunny Reef or Night Glow, English, Spanish or Uzbek.

Built with student privacy in mind

Only you sign in. Your students never create accounts or type anything in.

We only store what the tank needs: a name for each fish, its feed count and the daily totals, plus the days you open a classroom so we can count how often teachers come back.

Use first names or nicknames. No last names, emails or birthdays needed.

No ads, no tracking, no selling data. Ever.

Only you can see your classrooms. Every request is checked on the server.

Export your class list any time.

Delete a classroom or your whole account from Settings, instantly.

Questions

Is it really free?

Yes. Class Fish Tank is a free project for teachers. There is no paid plan and there are no ads.

What do I need in my classroom?

Any computer connected to your projector or smartboard with a modern browser (Chrome, Edge, Safari or Firefox). Nothing to install.

Do my students need accounts or devices?

No. Only the teacher signs in. Students just watch the tank and cheer.

Can I use it with more than one class?

Yes. Make a classroom for each class. Each one has its own fish, decorations, settings and leaderboard.

What happens at the end of the day?

At 23:59 in the classroom's time zone, every fish goes back to its starting size so each day is a fresh race. Every feeding stays on the leaderboard for a year.

It works at home but not at school. Why?

Some school networks block new websites until they're approved. Ask your IT team to allow classfishtank.com and supabase.co (where your classroom's data is stored).

Should I check with my school first?

Some schools ask teachers to get approval before using online tools with student names. Class Fish Tank only needs first names or nicknames, and our Privacy Policy explains exactly what is stored.

Want to say thanks?

Class Fish Tank is free for every teacher. If it brings some extra joy to your classroom, you can buy us some fish food, or pass it on to a teacher who'd love it.

Tips go through Ko-fi. They help pay for the servers and keep Class Fish Tank free. Have a classroom story? We'd love to hear it at classfishtank@gmail.com.