# FLEX Stronger vs RepSpeed

The clearest difference is in-app purchases: FLEX Stronger at none against RepSpeed's 1. FLEX Stronger also leads on iOS requirement (12.0 vs 14.0). RepSpeed's advantage is update cadence (every 2 weeks vs monthly) and review sentiment (83% vs 71%). On price, rating, ratings volume and ads there is nothing between them.

Both are free to download. RepSpeed sells 1 in-app purchase, starting at $0.99 per month. FLEX Stronger asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 4.4 for FLEX Stronger against 4.5 for RepSpeed. Both are backed by a comparable volume of ratings — 8 and 17 respectively. Written reviews are what separate them: 71% of FLEX Stronger's written reviews are positive against 83% of RepSpeed's.

FLEX Stronger ships an update monthly, RepSpeed every 2 weeks. The most recent releases landed on October 4, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | FLEX Stronger | RepSpeed |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.4 (8 ratings)](https://appshunter.io/ios/app/flex-stronger/id1452436164/reviews) | **[4.5 (17 ratings)](https://appshunter.io/ios/app/repspeed/id1584279988/reviews)** |
| Number of ratings | 8 | **17** |
| Positive reviews | 71.4% of reviews | **83.3% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Every 2 weeks** |
| Monetization | **Free** | Freemium |
| Size | 83 MB | 56 MB |
| Requires iOS | **12.0** | 14.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 4+ |
| Developer | [Kinetic Performance](https://appshunter.io/developer/343232407) | [Sreyas Rangaraju](https://appshunter.io/developer/1570083962) |

## 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


### RepSpeed

[App page](https://appshunter.io/ios/app/repspeed/id1584279988)

This app uses your phone's camera to analyze barbell lifts, providing detailed metrics like bar path, velocity, and power. Optimize your training, improve form, and get stronger faster with advanced analytics.

**Highlights:** Automatic barbell detection, Barbell path visualization, Velocity and power metrics, Video recording and upload, Repetition tracking, Workout notes

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| RepSpeed Premium | $0.99 | per month |


## Frequently asked questions

### Is FLEX Stronger free?

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

### Is RepSpeed free?

RepSpeed is free to download, with in-app purchases available.

### Which has better reviews, FLEX Stronger or RepSpeed?

RepSpeed is rated higher. FLEX Stronger averages 4.4 out of 5 from 8 ratings, while RepSpeed averages 4.5 from 17 ratings.

### Do FLEX Stronger or RepSpeed have ads?

Neither FLEX Stronger nor RepSpeed shows ads.

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

FLEX Stronger ships an update monthly, and RepSpeed every 2 weeks. Most recently, FLEX Stronger was updated on October 4, 2026 and RepSpeed 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.*