# FSA System vs Bike Sizer

The clearest difference is in-app purchases: FSA System at none against Bike Sizer's 1. FSA System also leads on iOS requirement (14.1 vs 17.0). Bike Sizer's advantage is update cadence (weekly vs every 3 months). On price, ads and device support there is nothing between them.

Both are free to download. Bike Sizer sells 1 one-off in-app purchase. FSA System asks for nothing beyond the download.

FSA System ships an update every 3 months, Bike Sizer weekly. The most recent releases landed on September 8, 2026 and June 3, 2026 respectively.

## The numbers

| Metric | FSA System | Bike Sizer |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Weekly** |
| Monetization | — | Free with in-app purchases |
| Size | 44 MB | 100 MB |
| Requires iOS | **14.1** | 17.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [F.S.A. srl](https://appshunter.io/developer/610405987) | [TECHNOLOGIES KALIDA INC.](https://appshunter.io/developer/1616678833) |

## What reviewers say

### FSA System

[App page](https://appshunter.io/ios/app/fsa-system/id6443544994)

**In-app purchases:** none


### Bike Sizer

[App page](https://appshunter.io/ios/app/bike-sizer/id6743167693)

Find your ideal bicycle or optimize your current setup with AI-powered recommendations. Access a comprehensive bike database and generate detailed, exportable reports to improve your cycling performance.

**Highlights:** AI-driven bike sizing, Extensive bike database, Positioning enhancement, PDF-exportable reports, Cycling practice optimization

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| session | $2.99 | one-time |


## Frequently asked questions

### Is FSA System free?

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

### Is Bike Sizer free?

Bike Sizer is free to download, with in-app purchases available.

### Do FSA System or Bike Sizer have ads?

Neither FSA System nor Bike Sizer shows ads.

### Which is updated more often, FSA System or Bike Sizer?

FSA System ships an update every 3 months, and Bike Sizer weekly. Most recently, FSA System was updated on September 8, 2026 and Bike Sizer on June 3, 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.*