# Critical Swim Speed — Calculate & Track CSS Progress

> Calculate & Track CSS Progress (iPhone/iPad app by Ed Stivala Limited.)

- Source: https://appshunter.io/ios/app/critical-swim-speed/id6474135199 (this page in markdown: same URL + `.md`)
- Developer: [Ed Stivala Limited](https://appshunter.io/developer/1686145102)
- Category: Sports, Health & Fitness
- Price: $0.99 (on sale, was $1.99)
- Age rating: 4+
- Requires: iOS 15.6 · 0 MB
- Languages: American English
- Released: 2023-12-12
- Data updated: 2026-08-23
- User reviews in markdown: https://appshunter.io/ios/app/critical-swim-speed/id6474135199/reviews.md

## What is Critical Swim Speed?

For Swimmers that take their training seriously and love DATA! 
If you want your time in the pool to be as productive as possible consider training at your 'critical swim speed'.  This app will calculate that number for you (based on a standard testing protocol). If you are unsure what the swim test is, I have included details in the app for you. 
- Calculate your CSS
- Log your results so you can track your progress
- Set an alert to be reminded when your next test is due

A simple to use app that helps you train more effectively and tracks your progress.


## Version history (last 5 releases)

### 1.4.1 — 2026-02-08

We've fixed an issue with css test reminders and made some improvements to the performance of our app.

### 1.4.0 — 2025-01-02

Add more detail to your Critical Swim Speed Test Result.

If you take your training seriously then you know your CSS is more than just the actual number. Many factors affect your performance on test day: Was the lane busy? Had you not slept well? Did you skip your last meal? And countless other considerations that your swim coach might ask about. Also if you use different pools, then how long was the length? 

In this update I have aligned my CSS Swimming app with the latest release of my FTP Cycling App, to enable athletes to store more context beyond just the number. Allowing you to review your results in a truer light and perhaps better understand what works for you.

### 1.3.1 — 2024-12-03

This update brings you an improved set of coaching instructions for completing your CSS swim. Helpful for newer athletes to CSS, but worth reviewing even if you have swam a few in the past. 

Also in this update the Menu page has been updated to give you a consistent experience with the latest releases of Running Calc and Cycling Calc (the other two apps in the Triathlete Bundle). This makes sending a feature request more streamlined, as is accessing support should you have any questions.

### 1.3.0 — 2024-09-17

Updated for iOS 18

### 1.2.0 — 2024-03-29

In this release I have made a small improvement to the CSS History Log to show when your next CSS evaluation swim is due. 
This will default to 6 weeks or use the CSS reminder value if you have set it in the Settings. Please note that this is independent of the Alert Reminder, so even if you have switched Alerts off the App will still use the value you set on the slider. 

Thanks for all the great suggestions sent through the Feature Request. And of course thank you for supporting my work by buying this app - hugely appreciated! Happy Swimming

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## More apps by Ed Stivala Limited

- [Profit Margin Analyser](https://appshunter.io/ios/app/profit-margin-analyser/id6448756151)
- [Run Times &  Paces](https://appshunter.io/ios/app/run-times-and-paces/id6449637693)
- [FTP Cycling Tracker](https://appshunter.io/ios/app/ftp-cycling-tracker/id6451365392)
- [Gifting Planner](https://appshunter.io/ios/app/gifting-planner/id6471303062)
- [Inventory Management Pro](https://appshunter.io/ios/app/inventory-management-pro/id6642683290)

All apps by Ed Stivala Limited: https://appshunter.io/developer/1686145102

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*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 2026-08-23.*