Reef Ledger
Utilities
Only for iPhone
$2.99 · In‑App Purchases · Designed for iPhone. Not verified for macOS.
iPhone
Your reef, by the numbers. Reef Ledger is the saltwater keeper's logbook.
KNOW YOUR WATER
Log alkalinity, calcium, magnesium, nitrate and more per tank - with trends that show drift before your corals feel it.
DOSE EXACTLY RIGHT
The dosing calculator turns tank volume and target into exact amounts.
NEVER MISS MAINTENANCE
Water changes, filter swaps, and feedings on schedule, with time-sensitive reminders.
UNLIMITED TANKS + CSV EXPORT
Every tank in one place; export your full history anytime.
PRIVATE BY DESIGN
Everything stays on this iPhone. No account, no cloud, no tracking.
One-time purchase. No subscription. Every feature included.
Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
Reef Ledger is now a one-time purchase - every feature unlocked, no subscription.
- Unlimited tanks, reminders, and CSV export for everyone
- Quick-start guide and accessibility improvements
The developer, Felix Barker, 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
- Felix Barker
- Size
- 2.6 MB
- Category
- Utilities
- Compatibility
Requires iOS 18.0 or later.
- iPhone
Requires iOS 18.0 or later. - Mac
Requires macOS 15.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 2.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Reef Ledger Pro $2.99
- Copyright
- © 2026 Felix Barker