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Built for reef aquarists
A clean, dark interface designed around the real workflow of maintaining a reef tank.
Track water chemistry, log readings, and spot trends with interactive charts — no account required. Everything stays on your device.
Built for reef hobbyists who want reliable data without the spreadsheet juggling.
Track salinity, pH, alkalinity, calcium, magnesium, temperature, nitrate, and phosphate. Log one reading in seconds or use the Log Sheet for your full test session.
Scrub through your history and spot exactly where a parameter drifted. Color-coded target range bands mark your ideal zone so you know immediately when something is off.
Log every water change with volume, date, and notes. A rolling chart shows change frequency alongside parameter trends so you can correlate maintenance with stability.
Every parameter shows in-range, low, or high at a glance. A Health Summary banner lets you assess your full water chemistry status in under ten seconds.
Everything lives on your device. No sign-up, no subscription needed for the core app. Your test results are always accessible, no Wi-Fi required.
Export your full history as JSON with one tap and share it via iCloud Drive, email, or AirDrop. Restore from backup just as easily.
A clean, dark interface designed around the real workflow of maintaining a reef tank.
No analytics. No tracking. No data ever leaves your device.
Tidal Reef stores all data locally in on-device SQLite storage. There are no servers, no accounts, no analytics SDKs, and no advertising. The app works without an internet connection. Read the full privacy policy.
Have a question or found a bug? We're happy to help.
Found something that isn't working right? Open an issue on GitHub and we'll take a look.
Open an IssueFor feature requests, feedback, or general questions, reach out by email.
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