# Simple Pool: Chemistry & Math — Pool Care Chemical Calculator > Pool and spa water chemistry calculator with dosing and tracking tools. (iPhone/iPad app by Grey Park, LLC.) - Source: https://appshunter.io/ios/app/simple-pool-chemistry-and-math/id6744664712 (this page in markdown: same URL + `.md`) - Developer: [Grey Park, LLC](https://appshunter.io/developer/1739831354) - Category: Lifestyle, Reference - Price: Free with in-app purchases - Rating: 4.90/5 from 18 App Store ratings · 7 written reviews indexed - Age rating: 4+ - Requires: iOS 17.6 · 24 MB - Languages: American English, Dutch, French (France), German (Germany), Italian, Brazilian Portuguese, European Spanish - Released: 2025-04-23 - Data updated: 2026-09-03 - Monetization: free with in-app purchases - User reviews in markdown: https://appshunter.io/ios/app/simple-pool-chemistry-and-math/id6744664712/reviews.md ## What is Simple Pool? Unlock crystal-clear pool water with Simple Pool - the pool chemistry calculator with no subscription, ever. One purchase, lifetime access. Simple Pool helps you test, dose, and track your pool water chemistry with precision. Get CYA-aware sanitizer targets, practical dosing recommendations, and powerful tools that make routine pool maintenance faster and easier. Whether you manage a chlorine pool, saltwater pool, bromine pool, or hot tub and spa, Simple Pool gives you accurate chemical calculations - including algae treatment dosing - every time. No more overspending at the pool store - just enter your test results and get exactly what your pool needs. What you can do: • Keep a chemical log of every addition with the unified Activity History • Log full water tests or Quick Tests in seconds • Built-in LSI calculator tracks the Langelier Saturation Index (LSI/CSI) to prevent scale and corrosion • Get dosing recommendations for chlorine, acid, total alkalinity, calcium hardness, stabilizer, and more • Set your exact chlorine concentration and acid strength for precise dosing • Use Shock Treatment mode (chlorine/saltwater pools) with progress tracking • Set recurring test reminders and shock retest reminders • Use the Chemical Effects Calculator to preview chemical changes before dosing • Track trends and test history over time with interactive charts • Haptic feedback confirms pool status at a glance • Support for chlorine, saltwater, and bromine pools • Keep visual track of how your pool is doing over time by snapping a photo during water testing • Share your pool's progress by tapping the share icon on your water test details Simple Pool Pro (one-time purchase, no subscription): • One-time purchase - no subscription, no recurring fees • Unlimited pools and spas • Full test and activity history • 90-day and all-time trend ranges • iCloud sync across Apple devices Free includes: • 1 pool • Test logging and dosing recommendations • 7-day and 30-day trends • 30 days of history Spend less time managing pool chemicals and more time enjoying your pool. Download Simple Pool and make pool care simple. Links: • Privacy Policy: https://sites.google.com/view/simple-pool-privacy-policy/home • Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ ## Key features - Water test logging - Dosing recommendations - Chemical tracking - LSI/CSI monitoring - Shock treatment mode - Test reminders - Chemical effects preview ## Pricing and in-app purchases Base price: Free. **One-time purchases** | Purchase | Price | Type | | --- | --- | --- | | SimplePool - Lifetime | $9.99 | one-time | ## Recent user reviews (7 of 7) All indexed reviews: https://appshunter.io/ios/app/simple-pool-chemistry-and-math/id6744664712/reviews.md ### 5/5 — Fantastic app for pool maintenance! *2026-06-18* This app is a really great app for helping me maintain a clear and clean pool. I don’t like wasting money on unnecessary chemicals and the recommendations have been very accurate - making maintenance get easier and easier through the season. **Developer response:** Thank you for the review and enjoy the swim season! ### 5/5 — Fixed App issue *2026-06-16* There was a bug that I reported through my review where I couldn’t use the APP. Within days the bug was corrected and now I’ll be using the APP! **Developer response:** Very sorry to hear you were unable to use Simple Pool! I investigated and found an issue where the button to proceed was indeed pushed off of the screen for some screen sizes and have since fixed that issue. Thank you for the feedback and I hope you are able to give Simple Pool another go! Edit: So glad to hear the issue was resolved for you! Please feel free to reach out with any future suggestions! ### 5/5 — Simply the Best *2026-06-04* Simple Poll is the best chemical tracking app for homeowners. I don’t manage multiple pools but it seems straightforward if you are a business owner (and as of this review, it’s just a one time fee of $9.99). The user interface is thoughtful and elegant, and the app is helpful with recommendations and reminders. There is no paywall to access essential features like logging multiple things per day, as is the case with other popular pool tracking apps. Additionally, the developer is extremely responsive and continues to make improvements with input from the community. Would highly recommend. **Developer response:** Thanks so much for using Simple Pool and for the detailed review! I hope you continue enjoying the app and have an excellent swim season! ### 5/5 — So User Friendly! *2026-04-21* Other apps were too confusing for me. This has everything I need and doesn’t go overboard with obscure stuff (if you’re into that, that’s great but I was looking for all the necessary stuff without needing a chemistry PhD). Thank you! **Developer response:** Thanks so much for using Simple Pool and for taking the time to review!! ### 5/5 — Helpful *2026-03-03* Making pool maintenance this year much easier! **Developer response:** Thanks for the review! Its very appreciated! ### 5/5 — Very nice *2026-02-25* Started using this at the end of last season. App has been very accurate and I’ll be using it to this spring and summer too. **Developer response:** Thanks for choosing Simple Pool and taking the time to review! ### 5/5 — Super Simple *2025-08-06* I came across this app on Reddit after i decided to start doing my own pool. This is the simplest app I’ve used, and I’ve tried them all. Very user friendly, no frills, no gimmicks, just straight to the point. i highly recommend Simple Pool to anyone that is ready to take over their pool!!! **Developer response:** Thanks for the review! I really appreciate it! ## Frequently asked questions about Simple Pool ### What is Simple Pool? Simple Pool is a pool and spa water chemistry calculator that helps you test, dose, and track your water. It provides precise chemical calculations and dosing recommendations to simplify pool maintenance. ### Does Simple Pool have a subscription? No, Simple Pool offers a one-time purchase for lifetime access to its Pro features, including unlimited pools and full history. The free version provides core functionality for one pool. ### What pool types does Simple Pool support? Simple Pool supports chlorine pools, saltwater pools, bromine pools, and hot tubs and spas. It provides tailored calculations for each type. ### Can I track my pool's history with Simple Pool? Yes, the app allows you to track your pool's test results and chemical additions with a unified Activity History. The Pro version offers extended trend ranges and all-time history. ### How does Simple Pool help prevent scale and corrosion? Simple Pool helps monitor the Langelier Saturation Index (LSI/CSI), a key factor in preventing scale buildup and corrosion in your pool water. ### What is the age rating for Simple Pool? Simple Pool has an age rating of 4+, making it suitable for a wide range of users. It is available on iPhone and iPad. ### How often is Simple Pool updated? The latest version of Simple Pool is 1.5.0, last updated on April 1, 2026. Updates typically include new features and improvements. ### Does Simple Pool have ads? No, Simple Pool does not contain advertisements. The app is free to download and use, with optional in-app purchases for advanced features. ## Version history (last 5 releases) ### 1.8.6 — 2026-08-05 What’s new: • Saltwater pools can now record combined chlorine. Shock tracking uses your actual reading instead of assuming zero, so it tells you when a shock is genuinely finished. • Salt levels can be corrected on a saved test, not only when you first log it. • Test entry is more consistent, with matching colors on the quick-value buttons and alkalinity options that step by 10 up to 120 ppm. Thanks for using Simple Pool! - Christian ### 1.8.4 — 2026-07-23 What’s new: • Choose Pool or Spa for temperature, sanitizer, and pH guidance tailored to your water. • Liquid Stabilizer is now available in dosing preferences, recommendations, and the chemical effects calculator. • Metric temperatures now work consistently throughout the app, with expanded translations and clearer range explanations. Thanks for using Simple Pool! - Christian ### 1.8.2 — 2026-07-17 Smarter water care and more reliable syncing: • Improved CSI calculations. • New chemistry explainers show what each reading means and how to adjust it. • Faster first-test flow, optional CYA in Quick Test, and buttons to clear individual readings. • Quickly reuse recently entered custom chemicals, plus new Liquid Stabilizer support. • Clearer iCloud sync health, upload/download status, and a new “Re-sync All Data” option. • Refreshed app icon and launch screen, expanded translations, and additional polish. ### 1.8.0 — 2026-07-11 Thanks for using Simple Pool! This update reimagines Trends so your water tells its own story at a glance. • Trends now opens with a plain-language Water Report: see whether your pool is balanced, slightly off, or needs attention without reading a single chart. • Personalized insights turn your numbers into clear next steps. • Charts are calmer and easier to trust, showing both ideal and acceptable ranges — and no longer inventing trends from sparse data. • Bug fixes and maintenance. ### 1.7.82 — 2026-07-08 This update fixes an issue where users with saltwater pool types could see an app crash when navigating to set custom chemical ranges. ## Apps similar to Simple Pool | App | Rating | Price | Category | | --- | --- | --- | --- | | [iopool](https://appshunter.io/ios/app/iopool/id1449698927) | 4.3 (94) | Free | Lifestyle | | [ICO – Smart pool/spa partner](https://appshunter.io/ios/app/ico-smart-poolspa-partner/id1132611479) | 3.9 (38) | Free | Lifestyle | | [Pool Math Calculator](https://appshunter.io/ios/app/pool-math-calculator/id6746519942) | 4.8 (43) | Free | Lifestyle | | [WaterLink Solutions PRO](https://appshunter.io/ios/app/waterlink-solutions-pro/id1398371628) | 2.9 (16) | Free | Lifestyle | | [WaterLink Home](https://appshunter.io/ios/app/waterlink-home/id1500943677) | 4.1 (37) | Free | Lifestyle | | [Pinch A Penny - Pool Care](https://appshunter.io/ios/app/pinch-a-penny-pool-care/id6473803551) | 1.9 (23) | Free | Lifestyle | ## More apps by Grey Park, LLC - [Budget Zero: Envelope Planner](https://appshunter.io/ios/app/budget-zero-envelope-planner/id6482576006) - [Calorie Counter: Log & Go!](https://appshunter.io/ios/app/calorie-counter-log-and-go/id6748836518) - [Treat Tally: Dessert Tracker](https://appshunter.io/ios/app/treat-tally-dessert-tracker/id6792447577) All apps by Grey Park, LLC: https://appshunter.io/developer/1739831354 ## Related topics [lsi calc db water balance log](https://appshunter.io/ios/topics/lsi-calc-db-water-balance-log) · [ai pool chemical calculator](https://appshunter.io/ios/topics/ai-pool-chemical-calculator) · [pool math](https://appshunter.io/ios/topics/pool-math) --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-03.*