ReefLog - Reef Tank Tracker
Log water tests in 30 seconds
Free · In‑App Purchases · Designed for iPad. Not verified for macOS.
Log your reef in 30 seconds. Never lose a reading again.
ReefLog is a water parameter tracker built for saltwater and reef tank keepers. Faster than a spreadsheet, smarter than a paper notebook.
WHY REEFLOG
- 30-second logging: A quick-entry sheet tuned to your test kits. Tap in your numbers and get back to enjoying your tank.
- Unlimited everything: Unlimited tanks, unlimited tests, unlimited history. No monthly measurement caps, no extra fee for a second tank.
- Trends you can actually read: Clean charts with safe-range bands, so a slow alkalinity drift stands out weeks before your corals show it.
- Reliable reminders: Test-day notifications that fit your schedule, so consistency stops depending on memory.
TRACK WHAT MATTERS
Alkalinity (dKH), Calcium, Magnesium, Nitrate, Phosphate, Salinity, Temperature, and pH. Input fields match your test kit's units and precision.
MADE FOR YOUR TANK
Tell ReefLog what you keep - SPS, LPS, soft corals, or fish-only - and it applies matching target ranges. SPS keepers get the strictest profile; fish-only tanks get sensible, forgiving bands.
YOUR DATA, YOUR CONTROL
- All records are stored on your device
- No account required
- Import from CSV (moving from a spreadsheet or another app)
- Export your full history to CSV anytime
- Attach photos to track coral growth and coloration
MULTI-TANK READY
Keep a display tank, a frag tank, and a quarantine tank? Switch between them instantly. Every tank gets its own log, charts, and target ranges.
PRICING
ReefLog is a paid app. One price unlocks every feature - choose weekly, annual, or lifetime. Subscriptions auto-renew and can be managed or canceled anytime in your store account settings.
Questions or feedback: support@reeflog.app
Terms of Use: https://exultant-tail-74b.notion.site/ReefLog-Terms-of-Use-39f02c4ed12280f1b0b9fe068de0bdfe
Privacy Policy: https://exultant-tail-74b.notion.site/ReefLog-PrivacyPolicy-39f02c4ed122808d9f2ad836b1f7d7fd
Ratings & Reviews
The developer, Katsuyuki Hayashi, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Katsuyuki Hayashi
- Size
- 41.4 MB
- Category
- Utilities
- Compatibility
Requires iOS 13.0 or later.
- iPhone
Requires iOS 13.0 or later. - iPad
Requires iPadOS 13.0 or later. - iPod touch
Requires iOS 13.0 or later. - Mac
Requires macOS 11.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Lifetime $44.99
- Annual $29.99
- Weekly $2.99
- Copyright
- © 2026 Katsuyuki Hayashi