# CSS Calculator Pro vs LaChart

The clearest difference is iOS requirement: CSS Calculator Pro at 8.1 against LaChart's 15.0. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

CSS Calculator Pro ships an update every 2 weeks, LaChart every 9 days. The most recent releases landed on October 8, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | CSS Calculator Pro | LaChart |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 weeks | **Every 9 days** |
| Monetization | Free | — |
| Size | 2 MB | 226 MB |
| Requires iOS | **8.1** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Alexey Ovod](https://appshunter.io/developer/1545142178) | [Jakub Stadnik](https://appshunter.io/developer/1895908891) |

## What reviewers say

### CSS Calculator Pro

[App page](https://appshunter.io/ios/app/css-calculator-pro/id1082142936)

This application helps swimmers learn and calculate their critical swim speed and sprint distance index. It also allows users to predict their race times based on their performance metrics.

**Highlights:** Learn critical swim speed test, Calculate critical swim speed, Calculate sprint distance index, Predict race time

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### LaChart

[App page](https://appshunter.io/ios/app/lachart/id6764768876)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is CSS Calculator Pro free?

CSS Calculator Pro is free to download, with no in-app purchases.

### Is LaChart free?

LaChart is free to download, with no in-app purchases.

### Do CSS Calculator Pro or LaChart have ads?

Neither CSS Calculator Pro nor LaChart shows ads.

### Which is updated more often, CSS Calculator Pro or LaChart?

CSS Calculator Pro ships an update every 2 weeks, and LaChart every 9 days. Most recently, CSS Calculator Pro was updated on October 8, 2026 and LaChart on October 11, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*