Keep it quiet — keep the fish!
🔊 Noise Threshold
Max allowed noise 45 dB
Whispering
20dB
Library
35dB
Quiet talking
45dB
Normal chat
60dB
Loud class
80dB
⏱ Fish arrive every...
30s
1 min
2 mins
3 mins
5 mins
10 mins
🐟 Max fish in tank
5
10
15
20
30
35
🌊 Tank Background
Tropical
Coral Reef
Arctic
Night Sea
Sunset
Deep Sea
🎨 Student Fish
No class saved
📄 Colouring Template
Print for students to colour in
🖼️

Upload coloured drawings
Tap to browse — each photo becomes a fish

Listening... 0 dB
2:00
🐠 0
⚙️

⚙️ Settings

Noise Threshold
45 dB
Background
Tropical
Coral
Arctic
Night
Sunset
Deep
Class Record 🏆
Best fish count 0 🐠
🎤

Allow Microphone

Decibel Reef needs your microphone to listen to classroom noise. Nothing is ever recorded or stored — it's only used to measure volume.

🎉 Full Tank! 🎉
Amazing work, class!