# HotTub&Pool > Chemical dosage and water balancing calculator for hot tubs, spas, and pools. (iPhone/iPad app by Pixelwand Ltd.) - Source: https://appshunter.io/ios/app/hottub-and-pool/id358719601 (this page in markdown: same URL + `.md`) - Developer: [Pixelwand Ltd](https://appshunter.io/developer/353011318) - Category: Utilities, Lifestyle - Price: Free - Rating: 3.50/5 from 13 App Store ratings · 21 written reviews indexed - Age rating: 4+ - Requires: iOS 8.0 · 8 MB - Languages: American English - Released: 2010-03-02 - Data updated: 2026-06-05 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/hottub-and-pool/id358719601/reviews.md ## What is HotTub&Pool? Calculator for hot tub, spa and pool owners to take the guesswork out of how much of each chemical you should be adding. The calculator will correctly work out doses for Calcium, raising and lowering alkalinity and pH, and adding the correct amounts of sanitizer and stabiliser. Also includes water balancing feature to allow you to calculate your pools or hot tubs Langelier Saturation Index (LSI) to help maintain an efficient and smooth running system. Common Pool Calculators • Pool Volume Calculator • Flow Rate Calculator • Turnover Calculator • Minimum Filter Size Calculator • Total Dynamic Head (measured) Calculator ## Key features - Chemical dosage calculation - Water balancing (LSI) - Pool volume calculator - Flow rate calculator - Turnover calculator - Filter size calculator ## Recent user reviews (10 of 21) All indexed reviews: https://appshunter.io/ios/app/hottub-and-pool/id358719601/reviews.md ### 5/5 — Great app *2021-06-07, version 2.0.0* If you have a basic understanding of pool chemistry this App is spot on. Outstanding d quick reference for Dosimetry g. ### 1/5 — Temperature *2021-05-21, version 2.0.0* Only shows Celsius ### 1/5 — No longer works *2020-08-07, version 2.0.0* This was an excellent app. Got a new iphone 11 and there is apparently a compatibility issue. App now displays just a blank aqua screen where the calculators used to be. Still works with an older iphone running the same number ios. No way to contact developer for help. Disappointing. ### 1/5 — Not adequate for hot tubs *2019-03-30, version 2.0.0* Claims to be for hot tubs, but you can only set the balance calculator up to 36 degrees centigrade which is only 96.8 Fahrenheit - most hot tubs are kept 100-104 degrees Fahrenheit. Oh, and you can’t change it from centigrade to Fahrenheit. ### 5/5 — Simple to use and awesome for the homeowner! *2018-05-26, version 2.0.0* Great app. My only complaint is compatibility with iOS 11. ### 5/5 — Number 1 pool app *2017-01-08* If you have a pool you need this app makes dosing your pool easy just test your pool punch the numbers in the app and it tells you the correct amount of chemicals to add too easy ### 2/5 — Poor user interface, tough to use *2016-04-28, version 1.7.0* You're better off paying for a better designed app you don't have to manually configure as much. This looks and functions like something from 10 years ago. Chemicals and measures seems a bit off. ### 1/5 — Crashed *2015-05-13, version 1.7.0* I was plugging in recent data to see if this calculator works. All was great for about 10 minutes. Now it crashes every time I try to go into the dosing screens. I think it would be decent if it didn't crash. One issue - sodium hypochlorite (bleach) comes standard at 8.25%, but this app only has options for 6% or 10%, 12.5%, and higher. ### 1/5 — Celsius only??? *2014-08-19, version 1.7.0* Seems like a good app, except when it comes to the temperature setting. Why can't you change between Fahrenheit and Celsius? It only allows Celsius, which means that I have to do the conversion separately to figure out what the Fahrenheit temperature is. When this gets fixed, I'll give it 5 stars!!! ### 1/5 — Useless!! *2013-04-03, version 1.5.0* It has "HotTub" in the name but you can't raise the temp slider to a hot enough temperature! AND it only has celsius. ## Frequently asked questions about HotTub&Pool ### What chemicals can HotTub&Pool calculate dosages for? HotTub&Pool can calculate dosages for Calcium, alkalinity, pH, sanitizer, and stabilizer. It aims to take the guesswork out of adding the correct amounts of these essential chemicals for your pool or hot tub. ### Does HotTub&Pool help with overall water balance? Yes, HotTub&Pool includes a water balancing feature that allows you to calculate your pool or hot tub's Langelier Saturation Index (LSI). This helps maintain an efficient and smoothly running system. ### What other pool calculators are included in HotTub&Pool? In addition to chemical calculations, HotTub&Pool offers several other useful calculators. These include Pool Volume, Flow Rate, Turnover, Minimum Filter Size, and Total Dynamic Head calculators. ### Is HotTub&Pool available on Android devices? Based on the provided information, HotTub&Pool is currently supported on iPhone and iPod devices. There is no mention of Android compatibility in the app's data. ### How often is HotTub&Pool updated? The latest version of HotTub&Pool is 2.0.0, which was last updated on September 2, 2016. This indicates that the app has not received updates in several years. ### What is the user rating for HotTub&Pool? HotTub&Pool has a user rating of 3.5 stars based on 13 ratings. This suggests a mixed reception from its user base. ### Does HotTub&Pool have ads? No, HotTub&Pool is ad-free. The app's data indicates that it does not contain advertisements, allowing for an uninterrupted user experience. ### What is the age rating for HotTub&Pool? HotTub&Pool has an age rating of 4+. This means it is suitable for users aged 4 and above, making it appropriate for most family members who manage pool care. ## Version history (last 5 releases) ### 2.0.0 — 2016-09-02 This app has been updated by Apple to display the Apple Watch app icon. iOS9 Compatibilty new pool calculators tab • Pool Volume Calculator • Flow Rate Calculator • Turnover Calculator • Minimum Filter Size Calculator • Total Dynamic Head (measured) Calculator ### 1.7.0 — 2013-08-12 fixed bugs in settings tab new icon ### 1.6.0 — 2013-08-05 How nice!! A new icon and a new color scheme bug fix: missing switch ppols buttonn in breakpoint chlorination detail view. moved settings to it's own tab You can now rearrange additives in table views to put the ones you use at the top ### 1.5.0 — 2012-09-26 iOS 6 compatible you can now add a photo to pool settings *fixed a small bug when using volume preferences ### 1.4.0 — 2012-02-09 Completely re-written for iOS 5 New features include:- multiple pools dose calculations for real products breakpoint calculation puckorius scaling index added to balance tab ## Apps similar to HotTub&Pool | App | Rating | Price | Category | | --- | --- | --- | --- | | [H2OCHK Hayward](https://appshunter.io/ios/app/h2ochk-hayward/id1367373317) | 3.0 (4) | Free | Utilities | | [Pool Math by TroubleFreePool](https://appshunter.io/ios/app/pool-math-by-troublefreepool/id1228819359) | 3.7 (272) | Free | Utilities | | [Pool Measure Pro](https://appshunter.io/ios/app/pool-measure-pro/id531430929) | 4.1 (10) | Free | Utilities | | [Pool Doctor](https://appshunter.io/ios/app/pool-doctor/id375459618) | 4.4 (130) | $19.99 | Utilities | | [Pooldash](https://appshunter.io/ios/app/pooldash/id1505607801) | 4.6 (11) | $19.99 | Utilities | | [Pool Shark H2O Pro](https://appshunter.io/ios/app/pool-shark-h2o-pro/id1467944894) | 4.7 (219) | Free | Utilities | ## More apps by Pixelwand Ltd - [ReefDoser](https://appshunter.io/ios/app/reefdoser/id353011315) - [Moth Collector](https://appshunter.io/ios/app/moth-collector/id1113939209) - [Curious Collector](https://appshunter.io/ios/app/curious-collector/id1245708227) - [Hull 100](https://appshunter.io/ios/app/hull-100/id1419993675) - [Puffin Spotter](https://appshunter.io/ios/app/puffin-spotter/id1632447940) All apps by Pixelwand Ltd: https://appshunter.io/developer/353011318 --- *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 2026-06-05.*