# StabilityAI vs Flexius

The clearest difference is iOS requirement: Flexius at 15.1 against StabilityAI's 18.1. On price, rating, ratings volume and update cadence there is nothing between them.

Both are free to download. StabilityAI sells 3 in-app purchases, starting at $9.99 per month and Flexius sells 2 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

On the App Store both sit at effectively the same score — 5.0 for StabilityAI against 5.0 for Flexius. Both are backed by a comparable volume of ratings — 6 and 4 respectively.

StabilityAI ships an update fortnightly, Flexius every 3 weeks. The most recent releases landed on October 31, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | StabilityAI | Flexius |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (6 ratings)](https://appshunter.io/ios/app/stabilityai/id6758789490/reviews) | [5.0 (4 ratings)](https://appshunter.io/ios/app/flexius/id6762490113/reviews) |
| Number of ratings | **6** | 4 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 3 weeks |
| Monetization | Freemium | Freemium |
| Size | 43 MB | 46 MB |
| Requires iOS | 18.1 | **15.1** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 17+ | 17+ |
| Developer | [Griffin Hunt](https://appshunter.io/developer/1795830925) | [George Levy](https://appshunter.io/developer/1893370819) |

## What reviewers say

### StabilityAI

[App page](https://appshunter.io/ios/app/stabilityai/id6758789490)

Improve mobility, reduce discomfort, and build healthier movement habits with personalized routines and guided exercises. Track your progress and receive adaptive insights to enhance your journey towards better everyday movement.

**Highlights:** Personalized mobility plans, Guided daily training routines, Progress tracking and visual dashboards, Gamified progression systems (XP, ranks), Adaptive exercise recommendations, Focus on back pain, hip, and knee discomfort

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Stability Premium (Monthly) | $9.99 | per month |
| Stability Premium (Yearly) 2 | $19.99 | per year |
| Stability Premium (Yearly) | $29.99 | per year |


### Flexius

[App page](https://appshunter.io/ios/app/flexius/id6762490113)

This guided stretching and mobility app helps users build consistent habits to improve flexibility and reduce stiffness. It offers timed routines with clear instructions, allowing users to easily follow along at home or the gym without needing to plan their sessions.

**Highlights:** Guided stretching routines, Timed stretches with instructions, Hold-to-start daily sessions, Routine setup based on goals, Weekly streak and progress tracking, Stretch catalog and custom builder

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly subscription | $4.99 | per month |
| Yearly subscription | $34.99 | per year |


## Frequently asked questions

### Is StabilityAI free?

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

### Is Flexius free?

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

### Which has better reviews, StabilityAI or Flexius?

StabilityAI and Flexius are both rated 5.0 out of 5 on the App Store, from 6 and 4 ratings respectively.

### Do StabilityAI or Flexius have ads?

Neither StabilityAI nor Flexius shows ads.

### Which is updated more often, StabilityAI or Flexius?

StabilityAI ships an update fortnightly, and Flexius every 3 weeks. Most recently, StabilityAI was updated on October 31, 2026 and Flexius on November 5, 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.*