# SIBERION vs The Flex

The clearest difference is iOS requirement: SIBERION at 13.4 against The Flex'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.

SIBERION ships an update monthly, The Flex every 3 weeks. The most recent releases landed on October 5, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | SIBERION | The Flex |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.8 (33 ratings)](https://appshunter.io/ios/app/the-flex/id6474018774/reviews)** |
| Number of ratings | — | **33** |
| Positive reviews | — | 43.4% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Monthly | **Every 3 weeks** |
| Monetization | — | Free |
| Size | 29 MB | 49 MB |
| Requires iOS | **13.4** | 15.0 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Fitbase](https://appshunter.io/developer/1530906929) | [ООО «ФЛЕКС ИРКУТСК»](https://appshunter.io/developer/1720348929) |

## What reviewers say

### SIBERION

[App page](https://appshunter.io/ios/app/siberion/id1578869597)

**Features:** macOS Compatibility

**In-app purchases:** none


### The Flex

[App page](https://appshunter.io/ios/app/the-flex/id6474018774)

Stay updated with studio news and schedules. Receive timely notifications about changes and special offers. Manage your fitness journey with ease.

**Highlights:** Studio news updates, Schedule tracking, Timely notifications, Special offers, Information on changes

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

**In-app purchases:** none

**What reviewers like**

- 👍 Convenient app release
- 👍 Clear schedule on app
- 👍 Good user experience overall

**What reviewers complain about**

- 🐌 Slow loading times
- 🐛 Frequent errors and crashes
- ❌ Difficult to book/cancel
- ❌ Missing website features
- ❌ Poor design and interface

**Reported bugs**

- App is disabled/not working
- Login errors
- Cannot authorize in app
- App crashes frequently
- Error 1019 when booking

**Requested features**

- Add ability to see number of people in queue
- Add ability to see available spots in schedule
- Return website functionality
- Improve schedule visibility (color coding, booking marks)
- Allow booking more than 6 sessions


## Frequently asked questions

### Is SIBERION free?

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

### Is The Flex free?

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

### Do SIBERION or The Flex have ads?

Neither SIBERION nor The Flex shows ads.

### Which is updated more often, SIBERION or The Flex?

SIBERION ships an update monthly, and The Flex every 3 weeks. Most recently, SIBERION was updated on October 5, 2026 and The Flex on October 15, 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.*