Joy Reef

In public beta

Always know what's going on in your tank.
Even at night.

All the monitoring you need — temperature, pH, levels, smart plugs, automations — with ~120 € of hardware you build yourself. All features free during the beta.

Open source firmware Beta: everything free No card required

Everything in one dashboard

Same page on phone and laptop. No app to install.

Sensors, plugs, automations — all in one place

Sensors

  • Temperature (DS18B20)
  • pH with 2-point calibration
  • Up to 4 float switches

Smart plugs

  • Off-the-shelf Tasmota plugs
  • Lights, heaters, pumps, skimmer
  • Pre-assembled doser boards

Automations

  • Automatic ATO with safety
  • Scheduled water changes
  • KH titration
  • Critical temperature alerts

Track your tank over time

Value journal and AI Advice: understand what's really happening.

Value journal

Track every parameter. Upload photos. See the trend.

  • Record KH, Ca, Mg, NO₃, PO₄, pH and any custom parameter
  • Upload photos of your tank with each measurement
  • Historical charts for every parameter
  • Compare different periods and spot trends

AI Advice

Personalised analysis based on your data. No generic tips.

  • Analyses your parameters and uploaded photos
  • Takes your tank type and equipment into account
  • Suggests specific corrections and changes to monitor
  • Supports Claude (Anthropic), GPT-4 (OpenAI) and Gemini

Online in a weekend

Three steps to start.

1

Buy the components

About 120 € list — ESP8266, temperature/pH sensors, relays, power supply.

See shopping list
2

Build the controller

Schematics and photos in the guide. No mandatory soldering — a screw-shield board is enough.

See build guide
3

Turn it on and sign up

The controller creates a temporary WiFi for setup. From there it talks to the portal.

All guides

Ready to see your tank from any phone?

No card required. No download.