# The Flex vs Sunkalpa App

The clearest difference is review sentiment: Sunkalpa App at 100% against The Flex's 43%. Sunkalpa App also leads on rating (5.0 vs 4.8). The Flex's advantage is update cadence (every 3 weeks vs every 3 months) and ratings volume (28 vs 3). On price, ads, in-app purchases and monetization model there is nothing between them.

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

Sunkalpa App holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: The Flex has 28 ratings behind it against 3, so its average is the more settled of the two. Written reviews point the same way: 43% of The Flex's written reviews are positive against 100% of Sunkalpa App's.

The Flex ships an update every 3 weeks, Sunkalpa App every 3 months. The most recent releases landed on September 23, 2026 and September 18, 2026 respectively.

## The numbers

| Metric | The Flex | Sunkalpa App |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.8 (28 ratings)](https://appshunter.io/ios/app/the-flex/id6474018774/reviews) | **[5.0 (3 ratings)](https://appshunter.io/ios/app/sunkalpa-app/id6757699053/reviews)** |
| Number of ratings | **28** | 3 |
| Positive reviews | 43.4% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 3 months |
| Monetization | Free | Free |
| Size | 63 MB | 61 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [ООО «ФЛЕКС ИРКУТСК»](https://appshunter.io/developer/1720348929) | [Marina Kuznecova](https://appshunter.io/developer/1868348915) |

## What reviewers say

### 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


### Sunkalpa App

[App page](https://appshunter.io/ios/app/sunkalpa-app/id6757699053)

Access a self-service system for booking practices and stay updated on center news. Discover unique offers and special pricing through this application.

**Highlights:** Self-service practice booking, Center news updates, Exclusive offers, Special pricing access, User-friendly interface

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

**In-app purchases:** none


## Frequently asked questions

### Is The Flex free?

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

### Is Sunkalpa App free?

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

### Which has better reviews, The Flex or Sunkalpa App?

Sunkalpa App is rated higher. The Flex averages 4.8 out of 5 from 28 ratings, while Sunkalpa App averages 5.0 from 3 ratings.

### Do The Flex or Sunkalpa App have ads?

Neither The Flex nor Sunkalpa App shows ads.

### Which is updated more often, The Flex or Sunkalpa App?

The Flex ships an update every 3 weeks, and Sunkalpa App every 3 months. Most recently, The Flex was updated on September 23, 2026 and Sunkalpa App on September 18, 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.*