# FS8 vs Kefir

The clearest difference is in-app purchases: FS8 at none against Kefir's 2. Kefir's advantage is update cadence (every 8 days vs every 4 weeks). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Kefir sells 2 in-app purchases, starting at $5.99 per month. FS8 asks for nothing beyond the download.

FS8 ships an update every 4 weeks, Kefir every 8 days. The most recent releases landed on September 11, 2026 and September 13, 2026 respectively.

## The numbers

| Metric | FS8 | Kefir |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.0 (20 ratings)](https://appshunter.io/ios/app/fs8/id6477149540/reviews)** | — |
| Number of ratings | **20** | — |
| Positive reviews | 66.7% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 weeks | **Every 8 days** |
| Monetization | Free | — |
| Size | 104 MB | 40 MB |
| Requires iOS | 15.1 | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [FS8 Inc.](https://appshunter.io/developer/1552735060) | [Daniel Signer](https://appshunter.io/developer/1603421894) |

## What reviewers say

### FS8

[App page](https://appshunter.io/ios/app/fs8/id6477149540)

Book fitness classes, join programs, and track your progress. Discover healthy recipes and educational content to enhance your physical and mental well-being. Achieve your fitness goals with this comprehensive wellness companion.

**Highlights:** Book and schedule fitness classes, Join 30-day fitness programs, Track progress and set goals, Discover healthy recipes, Access educational wellness articles, Book in-studio body scans

**Features:** macOS Compatibility

**In-app purchases:** none


### Kefir

[App page](https://appshunter.io/ios/app/kefir-nutrient-tracker/id6772584766)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $5.99 | per month |
| Annual | $29.99 | per year |


## Frequently asked questions

### Is FS8 free?

FS8 is free to download, with no in-app purchases.

### Is Kefir free?

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

### Do FS8 or Kefir have ads?

Neither FS8 nor Kefir shows ads.

### Which is updated more often, FS8 or Kefir?

FS8 ships an update every 4 weeks, and Kefir every 8 days. Most recently, FS8 was updated on September 11, 2026 and Kefir on September 13, 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.*