AquaLog: Aquarium Water Log
Fish Tank Tests & Trends
Free · In‑App Purchases · Designed for iPad. Not verified for macOS.
AquaLog is a simple water-quality log for people who keep aquariums — freshwater, planted or reef.
Test your water, write the numbers down, and let AquaLog remind you what needs doing. No spreadsheet, no guesswork, no account to create.
LOG A TEST IN SECONDS
• pH, ammonia, nitrite, nitrate, temperature, GH and KH in one short form
• Backdate a test you took earlier, or copy your last one and change only what moved
• Edit any reading later — mistakes happen
NEVER MISS MAINTENANCE
• Reminders for water changes, filter cleaning, feeding and anything else you do
• Repeating daily, weekly or monthly, with a notification when it is due
• Everything that needs attention, in one place on the home screen
FOLLOW EACH TANK OVER TIME
• A dated photo album for every aquarium
• A full timeline of every test, with swipe to delete and CSV export
• A fish list with a stocking check that warns you before a tank gets crowded
AQUALOG PRO
• Parameter trends and charts, so you spot a problem forming before your fish do
• Cycle tracker for new tanks — watch ammonia and nitrite fall as nitrate rises
• Symptom checker: pick what you are seeing and get the likely causes and what to do next
• Unlimited aquariums, reminders and photos
• iCloud sync, so your iPhone and iPad stay in step
FREE TO START
One aquarium, up to three reminders, five photos per tank — and unlimited water tests, always. Testing your water is the habit that matters, so we never limit it.
PRIVATE BY DESIGN
No account and no sign-up. Your log stays on your device and everything works offline. iCloud sync is optional and uses your own private iCloud account.
Available in English, French, Italian, Spanish and Portuguese.
Stop guessing. Start keeping.
Ratings & Reviews
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The developer, Paulo Cristo, 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
- Paulo Cristo
- Size
- 61.6 MB
- Category
- Lifestyle
- Compatibility
Requires iOS 16.4 or later.
- iPhone
Requires iOS 16.4 or later. - iPad
Requires iPadOS 16.4 or later. - Mac
Requires macOS 12.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
English and 4 more
- English, French, Italian, Portuguese, Spanish
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- AquaLog Pro Monthly $3.99
- AquaLog Pro Lifetime $29.99
- Copyright
- © 2026 Paulo Cristo