TubTest: Hot Tub Water Test

TubTest: Hot Tub Water Test

Step-by-Step Water Testing

32 ratings
9 reviews
Free

Details

  • Released
  • Updated
  • November 6, 2025
  • June 5, 2026

Features

TubTest: Hot Tub Water Test video #1 for iPhone
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About

This app guides you through hot tub water testing with clear, step-by-step instructions. It helps you understand reagent use, color interpretation, and proper testing sequences. After testing, it provides precise chemical dosing recommendations tailored to your hot tub's size and allows you to track your water history.

Step-by-step test guidance
Smart chemical dosing calculations
Water history tracking
Spa-specific chemistry optimization
Local data storage for privacy
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What's New in TubTest

1.7.5

June 5, 2026

Better salt water support is here! • New "Salt Water" sanitizer option — choose it during setup or in Settings • Calcium hardness targets now adjust automatically for salt systems (lower range to protect your salt cell) • Test and track your salt level, with exact dosing recommendations Plus reliability improvements: • More reliable sync across your devices • Retest reminders now stay on screen until you're ready to test • Fixed stabilizer (cyanuric acid) dosing when using custom ranges • Stale results now clear correctly so you always see current readings Thanks for the great feedback — a salt water user asked for this one. Keep it coming!

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User reviews

A must for tub owners

Super app to help manage chemistry. My favorite part is it tells you how much of what to add, to get to desired chemistry, based on your tub spec’s.

Clean Hot Tub, Helpful App

Love using TubTest ! I have a few Tubs I’m testing regularly and this always makes it super easy and useful. Great app thank you!

This app is perfect.

It completely removes the guesswork from water testing and replaces it with clarity and confidence. The guidance is accurate, the setup is thoughtful, and updates come quickly when feedback is shared. Highly recommended.

The perfect hot tub companion

This app has made hot tub maintenance bearable. No more guessing with test strips, just step-by-step instructions for testing and treatments. Simple, clean, and straightforward. And perfectly dialed into the Taylor test kits.

Great app for testing spa

As a new spa owner this app has helped tremendously. It walks you right through the testing process. I hope they soon add the FAS-DPD test for chlorine, as my Taylor 2006 test kit doesn’t come with the reagents for the apps chlorine test.

Response from developer

Thanks for the support! I'd love it if you could send an email to tubtestapp@gmail.com and let's see if we can help you out or get some support built into the app for what you're needing.

FAQ

How does TubTest help with water testing?

TubTest provides explicit, step-by-step instructions for testing your hot tub water. It clarifies which reagents to use, how many drops are needed, and how to interpret color changes, eliminating guesswork.

What chemical dosing information does TubTest offer?

After each test, TubTest calculates precise chemical dosing recommendations. It supports key parameters like pH, chlorine, bromine, alkalinity, and calcium hardness, and tailors these to your specific hot tub size.

Can I track my hot tub's water history with TubTest?

Yes, TubTest allows you to track your complete test history in a calendar view and your full treatment history, including chemicals added and when. This helps you spot trends over time and remember past maintenance.

Is TubTest compatible with different test kits?

TubTest is designed to work with Taylor test kits and also offers a quick test strip entry option. It focuses on spa-specific chemistry needs, supporting both bromine and chlorine sanitizers.

How does TubTest handle user privacy?

TubTest prioritizes privacy by storing all data locally on your device. It does not require accounts, use cloud storage, or collect any user data, ensuring your information remains private.

What is the update frequency for TubTest?

TubTest was last updated on March 18, 2026, indicating active development. While specific update frequency isn't detailed, the recent update suggests ongoing support and improvements.

What devices does TubTest support?

TubTest is available for iPhone and iPod devices, making it accessible to a wide range of Apple users who own hot tubs.

Is TubTest suitable for beginners?

TubTest is ideal for beginners as it provides clear, expert-level guidance through the entire testing process. It simplifies complex water chemistry, making hot tub ownership more manageable for new users.