# FLEX Stronger vs Kyna

The clearest difference is iOS requirement: FLEX Stronger at 12.0 against Kyna's 15.1. 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.

FLEX Stronger ships an update monthly, Kyna fortnightly. The most recent releases landed on October 4, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | FLEX Stronger | Kyna |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.4 (8 ratings)](https://appshunter.io/ios/app/flex-stronger/id1452436164/reviews)** | — |
| Number of ratings | **8** | — |
| Positive reviews | 71.4% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Monthly | **Fortnightly** |
| Monetization | Free | — |
| Size | 83 MB | 37 MB |
| Requires iOS | **12.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 4+ |
| Developer | [Kinetic Performance](https://appshunter.io/developer/343232407) | [Keanu Calo](https://appshunter.io/developer/1829696197) |

## What reviewers say

### FLEX Stronger

[App page](https://appshunter.io/ios/app/flex-stronger/id1452436164)

This app revolutionizes weight training by syncing with a sensor to provide real-time performance feedback. Track, manage, and review your training like elite athletes, with automated workouts and group training options. It offers detailed metrics, video recording with data overlay, and a community feature for sharing and downloading workouts.

**Highlights:** Real-time performance feedback, Velocity-based training (VBT), Automated workouts, Group training for up to three people, Video recording with synced data, 1RM prediction, Workout creation and sharing

**Features:** macOS Compatibility

**In-app purchases:** none


### Kyna

[App page](https://appshunter.io/ios/app/kyna/id6749269525)

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

**In-app purchases:** none


## Frequently asked questions

### Is FLEX Stronger free?

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

### Is Kyna free?

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

### Do FLEX Stronger or Kyna have ads?

Neither FLEX Stronger nor Kyna shows ads.

### Which is updated more often, FLEX Stronger or Kyna?

FLEX Stronger ships an update monthly, and Kyna fortnightly. Most recently, FLEX Stronger was updated on October 4, 2026 and Kyna on October 7, 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.*