The Flex vs Sunkalpa App
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
The Flex
Stay updated with studio news and schedules. Receive timely notifications about changes and special offers. Manage your fitness journey with ease.
- Studio news updates
- Schedule tracking
- Timely notifications
- Special offers
- Information on changes
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С помощью приложения вы можете следить за новостями, расписанием студии, оперативно получать информацию об изменениях в расписании и специальных предложениях
Sunkalpa App
Access a self-service system for booking practices and stay updated on center news. Discover unique offers and special pricing through this application.
- Self-service practice booking
- Center news updates
- Exclusive offers
- Special pricing access
- User-friendly interface
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С помощью приложения вы получаете доступ к самостоятельной системе записи на практики актуальным новостям центра,а также к уникальным предложениям и специальным ценам.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | The Flex | Sunkalpa App |
|---|---|---|
| Price | Free | Free |
| Rating | 4.8 (28 ratings) | 5.0 (3 ratings) — better |
| Positive reviews | 43.4% of reviews | 100.0% of reviews — better |
| Number of ratings | 28 — better | 3 |
| Update frequency | Every 3 weeks — better | Every 3 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPod | iPhone, iPod |
| Requires iOS | 15.0 | 15.0 |
| Further details — not scored | ||
| Size | 63 MB | 61 MB |
| Age rating | 4+ | 4+ |
| Developer | ООО «ФЛЕКС ИРКУТСК» | Marina Kuznecova |
Customer experience
The Flex
Sunkalpa App
Bugs and requests
The Flex
Reported bugs
15 issues- App is disabled/not working
- Login errors
- Cannot authorize in app
- App crashes frequently
- Error 1019 when booking
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- Error 1031 when cancelling
- Error 'Something went wrong'
- Cannot book or cancel sessions
- Personal cabinet not loading
- App is slow and lags
- Cannot add to calendar
- Personal cabinet errors (freezing, etc.)
- WhatsApp login issues (code not arriving)
- Application is disconnected
- All training sessions deleted if one is missed
Requested features
15 requests- 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
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- Add ability to cancel sessions closer to start time
- Add ability to rate trainers
- Add ability to see price for master classes
- Add ability to leave trainer reviews
- Add ability to freeze membership via app
- Add option to filter by available spots
- Add quick access to schedule
- Add option to disable promotional notifications
- Improve error handling messages
- Add ability to book massage directly
Sunkalpa App
Not enough reviews yet to summarise bugs or requests.
In-app purchases
The Flex
No in-app purchases
Sunkalpa App
No in-app purchases
