Everything your reef routine needs
- A profile for your tank. Save its name, net water volume and timezone, so due dates are always right.
- Maintenance that keeps itself in order. Set recurring tasks at any interval, see what’s due today, tick tasks off and keep a full history. Tapped the wrong one? Undo it.
- Water tests you can read at a glance. Log each parameter with clear units and see the trend on a chart, not just the latest number.
- Spending against your plan. Record what you actually spend in pounds, alongside the cost plan from our reef tank cost planner.
- Your data, under your control. Save it in this browser, download a backup file at any time, and restore it on another device.
Where your data lives
Companion runs entirely in your browser: your records stay on your device and we never receive them. Choose “Save Companion on this device” to keep your records, and save again after changes. Clearing your browser data removes them, so download a backup now and then. It’s also how you move to a new device.
What’s coming next
We’re building cloud sync, so your log follows you across phone and computer, along with maintenance reminders.
Plan first, then keep it running
Cost your whole system, plan your water-change batches and build a maintenance schedule you can stick to.