# FLEX Stronger vs TeamBuildr OS

The clearest difference is update cadence: FLEX Stronger at monthly against TeamBuildr OS's every 3 months. FLEX Stronger also leads on iOS requirement (12.0 vs 15.1). On price, ads, in-app purchases and device support 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, TeamBuildr OS every 3 months. The most recent releases landed on August 6, 2026 and September 24, 2026 respectively.

## The numbers

| Metric | FLEX Stronger | TeamBuildr OS |
| --- | --- | --- |
| 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** | Every 3 months |
| Monetization | Free | — |
| Size | 83 MB | 57 MB |
| Requires iOS | **12.0** | 15.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 17+ | 4+ |
| Developer | [Kinetic Performance](https://appshunter.io/developer/343232407) | [TeamBuildr, LLC](https://appshunter.io/developer/1148960444) |

## 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


### TeamBuildr OS

[App page](https://appshunter.io/ios/app/teambuildr-os/id6445898415)

**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 TeamBuildr OS free?

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

### Do FLEX Stronger or TeamBuildr OS have ads?

Neither FLEX Stronger nor TeamBuildr OS shows ads.

### Which is updated more often, FLEX Stronger or TeamBuildr OS?

FLEX Stronger ships an update monthly, and TeamBuildr OS every 3 months. Most recently, FLEX Stronger was updated on August 6, 2026 and TeamBuildr OS on September 24, 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.*