TankDiary
Aquarium Log & Care Reminders
Free · In‑App Purchases · Designed for iPad. Not verified for macOS.
Track pH, ammonia & more. Get reminders before water changes are overdue.
One-time purchase — no subscription, no account. Your data stays on your device.
Track your aquarium's water quality and never miss a maintenance day.
Simple, focused, and built for every type of tank — freshwater, planted, saltwater, or outdoor.
【Log Your Water Quality】
Record pH, temperature, GH, KH, ammonia, nitrite, and nitrate. Add up to 5 custom parameters. Your last reading is shown as a hint while you type, so entry is fast.
【Visualize Trends】
See parameters on a clean graph over 7, 30, 90 days, or all time — with the ideal range highlighted so you can spot problems at a glance. (30-day+ graphs require Pro)
【Maintenance Reminders】
Set repeating tasks for water changes, feeding, fertilizing, filter cleaning, CO2 refills, and more. The home screen shows "next maintenance in X days" for every tank.
【Reagent Timer】
Built-in 2, 5, and 10-minute countdowns — no more guessing when your test kit is ready.
【CSV / ZIP Export & Import — Free】
Export water records as CSV, or back up tanks, photos, logs, and schedules as a ZIP. Import the same files anytime — free for everyone.
【TankDiary Pro — One-Time Purchase】
• Register more than one tank
• View graphs beyond 7 days (30 / 90 / all-time)
No subscription. No recurring fees. Ever.
【Perfect for every tank】
Freshwater, planted, reef, goldfish, shrimp, outdoor ponds — TankDiary works with any setup.
Especially useful if you've ever:
• Lost fish from a missed water change
• Struggled to keep water parameters stable
• Wanted an easier alternative to spreadsheets
• Been managing multiple tanks (Corydoras, guppies, discus, goldfish, cichlids, shrimp...)
【Your data stays with you】
All records are stored on your iPhone or iPad. No cloud sync. No account required.
【No special hardware needed】
Works with any test kit or test strips. Just enter your readings manually.
【Pricing】
• Free: 1 tank, 7-day graphs, CSV/ZIP export & import, core features — free forever
• TankDiary Pro (one-time, no subscription): multiple tanks, long-term graphs
---
Developer: Kore Apps
Support: support@kore-apps.com
---
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
• Share cards are now customizable
- Choose from four sizes: Square, Portrait, Story, and Landscape
- Pick what to show on the card (up to 6): volume, days running, water parameters like temperature and pH, routines, and more
- Your size and field choices are remembered for next time
• Improved the resolution of shared images
The developer, kazuki korenori, 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 Linked to You
The following data may be collected but it is not linked to your identity:
- Purchases
- Identifiers
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- kazuki korenori
- Size
- 56.1 MB
- Category
- Lifestyle
- Compatibility
Requires iOS 15.0 or later.
- iPhone
Requires iOS 15.0 or later. - iPad
Requires iPadOS 15.0 or later. - iPod touch
Requires iOS 15.0 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 Japanese
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- TankDiary Pro $5.99
- Copyright
- © KoreApps