Comparison

HTH™ | Test to Swim™ vs Pool Math by TroubleFreePool

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

HTH™ | Test to Swim™

This app helps pool and spa owners maintain water quality by analyzing test strip results. It provides instant recommendations, step-by-step instructions, and access to helpful resources for clear and balanced water.

Highlights
  • Scan test strips with Google Cloud Vision
  • Interactive spa test strip matching
  • Instant water balance recommendations
  • Save test history
  • Pool and spa care resource library
  • Retail product locator
Features
Read full description

HTH™ Test to Swim™ pool water testing app is your partner in DIY pool and spa water care and essential to your weekly water care routine. Our new and improved HTH™ Pools App includes exciting new features, this powerful app works seamlessly with HTH™ Pool Care 6-Way Test Strips, now with more accurate results from Google Cloud Vision Technology. The app also includes new features for spa owners, including HTH spa™ Test Strips matching. With our innovative products and resources, HTH™ Pool Care is on a mission to help you minimize the unpredictability in pool and spa water care. Spend less time guessing and more time splashing in brilliantly clear water with HTH™! • Easily scan your HTH™ Pool Care 6-Way Test Strips within the app, now with more accurate results from Google Cloud Vision Technology • Use the interactive chart to match your HTH spa™ Test Strips and get quick, accurate results and recommendations • Receive instant solutions, step-by-step instructions and product recommendations to balance your pool water from HTH™ pool & spa care experts • Create a myHTH account to save your water test history for easy comparison and keep track of your favorite HTH™ pool and spa products for easy reference • Access a library of pool and spa care resources, including how-to videos, on everything from regular maintenance to solutions for specific pool and spa problems • Find HTH™ pool and spa products near you with our retail locator • The app supports U.S. pool and spa owners For more information, visit hthpools.com

About

Pool Math by TroubleFreePool

Easily manage your swimming pool's water chemistry by tracking key levels like chlorine and pH. This app calculates the precise amounts of chemicals needed to maintain clear, algae-free water, offering a cost-effective alternative to pool store advice.

Highlights
  • Chemical level calculators (pH, Chlorine, Alkalinity, etc.)
  • Track pool maintenance tasks
  • Log chemical additions
  • Weather condition tracking
  • Chemical addition effect calculations
  • Bleach price comparison
  • Data backup and export
Features
Read full description

PoolMath makes swimming pool care, maintenance and management easy by tracking chlorine, pH, alkalinity and other levels to help calculate how much salt, bleach and other chemicals to add. Keep swimming in your TroubleFreePool with Pool Math. Crystal clear algae free pool water is what Trouble Free Pool Math is committed to. Pool Math performs all the calculations you need to keep your chlorine, pH, calcium, alkalinity, and stabilizer levels balanced. Why choose Pool Math over the others? Other apps claim to make testing easy by using test strips and your phone's camera. Unfortunately, this is simply too good to be true. Test strips are notoriously inaccurate and end up costing you much more money in both chemicals and the tests themselves in the long run. Trouble Free Pool believes using a proper test kit is much easier, effective, and economical in the long run. By following these calculations the pool owner achieves and maintains crystal clear water without reliance on the often unproductive advice and unneeded expense from pool stores. Pool Math's great features include: • Calculators for pH, Free Chlorine, Calcium Hardness, Salt, Total Alkalinity, Calcium Hardness, Borates, CSI • Track Maintenance: Backwashing, Vacuuming, Filter Cleaning, Filter Pressure, SWG Cell %, Flow Rate • Track Chemical Additions • Track Weather conditions with your logs • Calculate the Effects of Adding chemicals to your pool • Bleach Price Calculator - Find the best deals on bleach easily • Summary page to see an overview of test results and chemical additions • Data backup / Export Premium Subscribers get access to these additional features: • Unlimited Test Log History Storage • Maintenance Reminders • Cloud Sync/Backup • Sync across multiple devices • Unlimited Pool / Spa Configurations • Test Log CSV Import / Export Pool Math Premium Subscription details: • Auto-renewable subscription • 1 year for $7.99 USD • Your subscription will be charged to your iTunes account at confirmation of purchase and will automatically renew (at the duration of 1 year) unless auto-renew is turned off at least 24 hours before the end of the current period. • Current subscription may not be cancelled during the active subscription period; however, you can manage your subscription and/or turn off auto-renewal by visiting your iTunes Account Settings after purchase. • Privacy Policy & Terms of Use: http://poolmathapp.com/privacy/

Screenshots

HTH™ | Test to Swim™4 screens
Pool Math by TroubleFreePool4 screens

Verdict

The call

The clearest difference is rating: HTH™ | Test to Swim™ at 4.7 against Pool Math by TroubleFreePool's 3.6. HTH™ | Test to Swim™ also leads on in-app purchases (none vs 1) and ratings volume (4.2K vs 287). Pool Math by TroubleFreePool's advantage is review sentiment (63% vs 24%) and update cadence (fortnightly vs monthly). On price, ads, monetization model and device support there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Pool Math by TroubleFreePool sells 1 in-app purchase, starting at $7.99 per year. HTH™ | Test to Swim™ asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

HTH™ | Test to Swim™ holds the better App Store score, 4.7 against 3.6. That said, the two scores are not equally well evidenced: HTH™ | Test to Swim™ has 4.2K ratings behind it against 287, so its average is the more settled of the two. Written reviews complicate that: 24% of HTH™ | Test to Swim™'s written reviews are positive against 63% of Pool Math by TroubleFreePool's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

HTH™ | Test to Swim™ ships an update monthly, Pool Math by TroubleFreePool fortnightly. The most recent releases landed on November 6, 2026 and November 4, 2026 respectively.

Scorecard5 real differences · 5 level
HTH™ | Test to Swim™ versus Pool Math by TroubleFreePool: the parameters behind the verdict, then further details
ParameterHTH™ | Test to Swim™Pool Math by TroubleFreePool
PriceFreeFree
Rating4.7 (4.2K ratings) — better3.6 (287 ratings)
Positive reviews23.9% of reviews63.3% of reviews — better
Number of ratings4.2K — better287
Update frequencyMonthlyFortnightly — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree with in-app purchasesFreemium
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.115.0 — better
Further details — not scored
Size55 MB314 MB
Age rating4+4+
DeveloperSolenis, LLCTroubleFreePool

Customer experience

HTH™ | Test to Swim™

All ratings4,010 ratings
Positive92.1%
Neutral3.0%
Negative4.9%
Written reviews184 reviews
Positive23.9%
Neutral3.8%
Negative72.3%

Pool Math by TroubleFreePool

All ratings262 ratings
Positive66.0%
Neutral7.3%
Negative26.7%
Written reviews128 reviews
Positive63.3%
Neutral10.9%
Negative25.8%

User reviews

HTH™ | Test to Swim™

From 4.2K App Store ratings

What we love

  • 🚀 Easy to use
  • 👍 Helpful guidance
  • 💡 Tracks water testing history

Room to improve

  • 🐛 Inconsistent and inaccurate results
  • 🤖 Poor camera/scanning functionality
  • 🤔 Requires too much personal information
  • 🚫 Doesn't work for all pool types

Pool Math by TroubleFreePool

From 287 App Store ratings

What we love

  • 💎 Excellent for maintaining a clean, balanced pool
  • 🔍 Comprehensive tracking of test results and chemical additions
  • 🧠 Helpful recommendations for chemical adjustments
  • ⚙️ Useful features like SLAM mode and timeline
  • 🤖 Automatic weather data logging

Room to improve

  • 🐛 Issues with data syncing and backup
  • 🤔 Unintuitive interface and navigation
  • 💰 Subscription model and lack of one-time purchase
  • 🚫 Limited support for non-chlorine sanitizers and spa-specific options
  • 🔄 Bugs with chemical addition logging and target value retention

Bugs and requests

HTH™ | Test to Swim™

Reported bugs

3 issues
  • Registration and login issues
  • Crashing and freezing
  • Incompatible with certain devices

Requested features

3 requests
  • Ability to manually enter test results
  • More customization for pool size/type
  • Improved accuracy and consistency

Pool Math by TroubleFreePool

Reported bugs

4 issues
  • Subscription issues and inability to restore purchases
  • App crashes and freezes on certain actions
  • Incorrect chemical recommendations and calculations
  • Disappearing historical data after updates

Requested features

5 requests
  • Custom target ranges and alerts
  • Ability to log non-standard chemical additions
  • Export options for data analysis
  • Apple Watch integration
  • Improved user guidance and on-boarding

In-app purchases

None

HTH™ | Test to Swim™

No in-app purchases

1 purchases

Pool Math by TroubleFreePool

Subscriptions1
  • Pool Math Premium Subscription$7.991 Year

Questions

Is HTH™ | Test to Swim™ free?
HTH™ | Test to Swim™ is free to download, with no in-app purchases.
Is Pool Math by TroubleFreePool free?
Pool Math by TroubleFreePool is free to download, with in-app purchases available.
Which has better reviews, HTH™ | Test to Swim™ or Pool Math by TroubleFreePool?
HTH™ | Test to Swim™ is rated higher. HTH™ | Test to Swim™ averages 4.7 out of 5 from 4.2K ratings, while Pool Math by TroubleFreePool averages 3.6 from 287 ratings.
Do HTH™ | Test to Swim™ or Pool Math by TroubleFreePool have ads?
Neither HTH™ | Test to Swim™ nor Pool Math by TroubleFreePool shows ads.
Which is updated more often, HTH™ | Test to Swim™ or Pool Math by TroubleFreePool?
HTH™ | Test to Swim™ ships an update monthly, and Pool Math by TroubleFreePool fortnightly. Most recently, HTH™ | Test to Swim™ was updated on November 6, 2026 and Pool Math by TroubleFreePool on November 4, 2026.

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