# К41 vs PilatesStudio by KS

К41 and PilatesStudio by KS are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

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

Both ship on a similar rhythm, roughly every 6 weeks. The most recent releases landed on October 8, 2026 and September 19, 2026 respectively.

## The numbers

| Metric | К41 | PilatesStudio by KS |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 75.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 weeks | Every 6 weeks |
| Monetization | Free | — |
| Size | 51 MB | 51 MB |
| Requires iOS | 15.1 | 15.1 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Fitbase](https://appshunter.io/developer/1530906929) | [Vasiliy Suvorov](https://appshunter.io/developer/1612668132) |

## What reviewers say

### К41

[App page](https://appshunter.io/ios/app/41/id1558443349)

Manage your fitness club membership with this app. Book classes, track attendance, and stay updated on news and promotions. Enjoy an active lifestyle with your family.

**Highlights:** View training schedule, Book training sessions, Get workout reminders, Receive club news, Track attendance, Monitor membership validity

**Features:** Vision Pro support

**In-app purchases:** none


### PilatesStudio by KS

[App page](https://appshunter.io/ios/app/pilatesstudio-by-ks/id1641155579)

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

**In-app purchases:** none


## Frequently asked questions

### Is К41 free?

К41 is free to download, with no in-app purchases.

### Is PilatesStudio by KS free?

PilatesStudio by KS is free to download, with no in-app purchases.

### Do К41 or PilatesStudio by KS have ads?

Neither К41 nor PilatesStudio by KS shows ads.

### Which is updated more often, К41 or PilatesStudio by KS?

К41 ships an update every 6 weeks, and PilatesStudio by KS every 6 weeks. Most recently, К41 was updated on October 8, 2026 and PilatesStudio by KS on September 19, 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.*