Tankwell: Water Change Timer

One tap. Every tank on time.

Only for iPhone

Free · In-App Purchases · Designed for iPhone. Not verified for macOS.

iPhone

Tankwell is a fast, fully offline aquarium water change reminder for anyone keeping one tank or a whole fish room. No accounts, no cloud sync, no clutter — just a clean list of your tanks and exactly when each one needs attention. Most tank-tracking apps bury the one thing you actually open them for — "is it time yet?" — under logs, journals, and social feeds. Tankwell strips that away: add a tank in two taps, set a water-change interval, and get a local reminder when it's due. Logging a completed change takes one tap and instantly resets the countdown. WHY TANKWELL • One-tap logging — no forms, no friction • Fully offline — your tank data never leaves your phone • No account, no sign-in, no ads • Built for aquarists managing multiple tanks at once INCLUDED • Track up to 2 tanks with water-change reminders • One-tap logging with automatic countdown reset • Local notifications so you never forget • Full change history per tank TANKWELL PRO (one-time purchase) • Unlimited tanks • Filter change, water test, and fertilizer dosing reminders • Custom reminder time per task • Export full history as CSV Whether you run a single betta bowl or a fish room full of reef and cichlid tanks, Tankwell keeps every water change on schedule without ever asking for your data.

Ratings & Reviews

  • This app has not received enough ratings or reviews to display an overview.

Fixed minor issues and improved overall stability.

Version 1.0.2

The developer, 永 张, 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.

    Privacy practices may vary based, for example, on the features you use or your age. Learn More

    Accessibility

    The developer has not yet indicated which accessibility features this app supports. Learn More

    Information

    Provider
    • 永 张
    Size
    • 653.3 KB
    Category
    • Utilities
    Compatibility
    Requires iOS 26.0 or later.
    • iPhone
      Requires iOS 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.
    Languages
    • English
    Age Rating
    4+
    In-App Purchases
    Yes
    Copyright
    • Copyright © 2026 Peter Zhang. All rights reserved.
  • Developer Website
  • Privacy Policy

    • More by 永 张