Nitrify: Aquarium Water Test
Cycle tracker & tank care log
Only for iPhone
Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.
iPhone
Is your tank cycled yet? Log ammonia, nitrite and nitrate and Nitrify calls the stage, reads the trend, and tells you when it's finally safe to add fish.
Your test kit gives you numbers. Nitrify tells you what they mean.
Log ammonia, nitrite and nitrate, and Nitrify reads where your tank is in the cycle, whether the water's safe, and what's changed since last time. Made for freshwater keepers who want an answer, not just a spreadsheet.
Know your cycle. Every test gets a stage: waiting on ammonia, the nitrite spike, finishing, or fully cycled. Pro reads your own trend to estimate when it'll finish.
Know if it's safe. A plain Safe, Watch or Act call on every reading. Pro breaks down ammonia, nitrite, nitrate, pH, GH, KH and phosphate against their target ranges, and warns you when one drifts the wrong way.
Stay on top of upkeep. Water changes, filter cleans, plant trims and dosing, all in one log. Pro adds reminders, custom schedules, and a dilution preview that shows what a 30% change does to your nitrate.
Your tanks, your data. Multiple tanks with Pro, a photo journal, a Home-Screen widget and CSV export, all synced over iCloud with no account and nothing sent to a server. Full light and dark mode.
Pay once. Free covers logging, your cycle stage, the safety verdict, one tank and iCloud sync. Nitrify Pro is a single one-time unlock. No subscription, no ads.
Nitrify reads your water against general freshwater ranges to guide you; it isn't a diagnosis of your tank or livestock. During a cycle, high ammonia and nitrite are normal, and the app tells you so.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
Small fixes and improvements. Thanks for using Nitrify.
The developer, Charith Perera, 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
- Charith Perera
- Size
- 2.1 MB
- Category
- Utilities
- Compatibility
Requires iOS 26.2 or later.
- iPhone
Requires iOS 26.2 or later. - Mac
Requires macOS 26.2 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 26.2 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Nitrify Pro $9.99
- Copyright
- © 2026 Charith Perera