Comparison

Pool Math by TroubleFreePool vs Stain Fix

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

Head to head
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/

About

Stain Fix

Instantly identify and remove tough stains with guided, step-by-step instructions. Simply snap a photo of the mess, confirm the surface, and receive a personalized cleaning plan with timers and product suggestions. Save successful methods for future use.

Highlights
  • Photo stain identification
  • Step-by-step cleaning plans
  • Timer-guided cleaning
  • Product swap suggestions
  • Surface-specific safety notes
  • Saved cleaning methods
Features
Read full description

Stain Savior gives you Kristen's step-by-step stain help right when the mess happens. Snap a photo or upload one. Confirm the stain and surface. Get a clear cleaning plan with timers, product swaps, and safety notes. Mark the result and get a safer next step if the stain is still there. Save what worked for next time. Use Stain Savior for real-life messes on: • Clothes and laundry • Carpet and rugs • Couches and upholstery • Kitchen and household surfaces • Common stains like wine, grease, ink, mud, blood, food, makeup, and more Why people keep it on their phone: • Fast stain identification from a photo • Step-by-step stain removal help • Tiny, low-overwhelm cleaning steps • Timer-guided cleaning flow • "Use what ya have" product swaps • Surface-specific safety reminders • Saved fixes for repeat messes This is not a generic cleaning wiki. It's Kristen's method, built for the moment you need it most. No digging through comments. No guessing what to use. No long, overwhelming checklists. Just open the app, snap the stain, and get the next right step. Always spot test first on delicate materials. Privacy: https://www.builtbyfoundry.io/stain-savior/privacy Terms: https://www.builtbyfoundry.io/stain-savior/terms EULA: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

Pool Math by TroubleFreePool4 screens
Stain Fix4 screens

Verdict

The call

Pool Math by TroubleFreePool and Stain Fix both sit at 3.7 stars, but that hides the real split: 100% of Stain Fix's written reviews are positive against 63% of Pool Math by TroubleFreePool's. Stain Fix also leads on update cadence (every 2 days vs fortnightly). Pool Math by TroubleFreePool's advantage is ratings volume (272 vs 3). On price, rating, ads and in-app purchases 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 and Stain Fix sells 2 in-app purchases, starting at $9.99 per month. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 3.7 for Pool Math by TroubleFreePool against 3.7 for Stain Fix. That said, the two scores are not equally well evidenced: Pool Math by TroubleFreePool has 272 ratings behind it against 3, so its average is the more settled of the two. Written reviews are what separate them: 63% of Pool Math by TroubleFreePool's written reviews are positive against 100% of Stain Fix's.

UpkeepUpdate frequency

Pool Math by TroubleFreePool ships an update fortnightly, Stain Fix every 2 days. The most recent releases landed on September 22, 2026 and September 5, 2026 respectively.

Scorecard3 real differences · 7 level
Pool Math by TroubleFreePool versus Stain Fix: the parameters behind the verdict, then further details
ParameterPool Math by TroubleFreePoolStain Fix
PriceFreeFree
Rating3.7 (272 ratings)3.7 (3 ratings) — better
Positive reviews63.4% of reviews100.0% of reviews — better
Number of ratings272 — better3
Update frequencyFortnightlyEvery 2 days — better
AdsNoNo
In-app purchasesYesYes
MonetizationFreemiumFree with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.0 — better15.1
Further details — not scored
Size314 MB79 MB
Age rating4+4+
DeveloperTroubleFreePoolBUILT BY FOUNDRY, INC.

Customer experience

Pool Math by TroubleFreePool

All ratings262 ratings
Positive66.0%
Neutral7.3%
Negative26.7%
Written reviews123 reviews
Positive63.4%
Neutral11.4%
Negative25.2%

Stain Fix

All ratings3 ratings
Positive66.7%
Neutral0.0%
Negative33.3%
Written reviews2 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Bugs and requests

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

Stain Fix

Not enough reviews yet to summarise bugs or requests.

In-app purchases

1 purchases

Pool Math by TroubleFreePool

Subscriptions1
  • Pool Math Premium Subscription$7.991 Year
2 purchases

Stain Fix

Subscriptions2
  • Monthly Premium$9.991 Month
  • Annual Premium$39.991 Year

Questions

Is Pool Math by TroubleFreePool free?
Pool Math by TroubleFreePool is free to download, with in-app purchases available.
Is Stain Fix free?
Stain Fix is free to download, with in-app purchases available.
Which has better reviews, Pool Math by TroubleFreePool or Stain Fix?
Stain Fix is rated higher. Pool Math by TroubleFreePool averages 3.7 out of 5 from 272 ratings, while Stain Fix averages 3.7 from 3 ratings.
Do Pool Math by TroubleFreePool or Stain Fix have ads?
Neither Pool Math by TroubleFreePool nor Stain Fix shows ads.
Which is updated more often, Pool Math by TroubleFreePool or Stain Fix?
Pool Math by TroubleFreePool ships an update fortnightly, and Stain Fix every 2 days. Most recently, Pool Math by TroubleFreePool was updated on September 22, 2026 and Stain Fix on September 5, 2026.

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