ReefLog: Aquarium Water Tests
Tests, dosing, livestock
Free · In‑App Purchases · Designed for iPad. Not verified for macOS.
Log water tests, see every parameter against its target band, and catch alkalinity drift before the corals do. Dosing, livestock, maintenance, journal. iCloud sync.
ReefLog is a water test log for reef and aquarium keepers who want stable parameters. Log what you test, see every value against its target band, and catch a drifting parameter weeks before it becomes a problem. No account, no tracking. Everything lives on your device and in your private iCloud, and syncs across your iPhone, iPad, and Mac.
THE EIGHT NUMBERS THAT RUN A REEF
pH, alkalinity, calcium, magnesium, nitrate, phosphate, salinity, and temperature. Log a full test day or just the alkalinity check; the parameter board always shows the latest value for each, colored by whether it sits inside your target range.
TARGET BANDS ON EVERY CHART
Trend charts draw your target range as a band behind the line, with every reading colored in or out of range. Reef defaults for all eight parameters are built in, and every band is editable per tank, whether you run SPS hot at 8.5 dKH or keep a fish-only system.
CATCH THE DRIFT EARLY
ReefLog computes the trend of every parameter and calls out the one moving fastest: "Alkalinity is drifting down, about 1.2 dKH over the last 21 days." A stability score tells you what share of your readings sat in range over the last 30 days.
A DOSING LOG THAT REMEMBERS
Every dose records the product, the amount in ml, and the parameter it moves. Recent products refill with one tap, and the drift callout shows your last matching dose, so "did I already bump the dose?" has an answer.
LIVESTOCK AND CORAL REGISTRY
Every fish, coral, and invert with a photo, species, source, and the date it joined the tank. Filter by kind and watch the registry become the story of your reef.
MAINTENANCE THAT STAYS ON SCHEDULE
Water changes, filter floss, skimmer cup, refractometer calibration: set the interval once and ReefLog tracks due and overdue, with an optional reminder per task. A starter pack of common reef tasks is one tap.
A JOURNAL AND CLEAN CSV EXPORTS
Date-stamped notes hold the story between the numbers. Export your tests, doses, and journal as CSV files with ISO dates and spreadsheet-safe decimals whenever you want your data elsewhere.
YOUR UNITS
dKH or meq/L, specific gravity or ppt, Fahrenheit or Celsius, gallons or liters. Pick once in Settings; everything follows.
ON EVERY SCREEN YOU OWN
ReefLog syncs across iPhone, iPad, and Mac with iCloud. The iPad layout puts the trend charts beside a grid of every parameter, a proper dashboard for a reef.
FREE VS LIFETIME
Free includes 1 tank and 15 water tests with every tool: target bands, trend charts, dosing log, livestock registry, maintenance reminders, and journal. One lifetime purchase ($14.99 USD) unlocks unlimited tests, unlimited tanks, and the CSV exports. No subscription, no account.
ReefLog is a hobby log for your own records. Test, log, adjust. The reef stays boring, in the best way.
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The developer, InnovaLabWorks, 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
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Information
- Seller
- 9547-8715 QUEBEC INC.
- Size
- 1.9 MB
- Category
- Lifestyle
- Compatibility
Requires iOS 26.0 or later.
- iPhone
Requires iOS 26.0 or later. - iPad
Requires iPadOS 26.0 or later. - Mac
Requires macOS 26.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 26.0 or later.
- iPhone
- Languages
- English and French
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- ReefLog Lifetime $49.99
- Copyright
- © 2026 InnovaLabWorks (9547-8715 Quebec Inc.)