# Ankle Flex vs StayUpRight!

The clearest difference is update cadence: StayUpRight! at every 2 weeks against Ankle Flex's every 5 months. Ankle Flex's advantage is device support (3 vs 1) and iOS requirement (15.6 vs 17.0). On price, 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.

Ankle Flex ships an update every 5 months, StayUpRight! every 2 weeks. The most recent releases landed on October 28, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Ankle Flex | StayUpRight! |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (4 ratings)](https://appshunter.io/ios/app/stayupright/id6761411871/reviews)** |
| Number of ratings | — | **4** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 2 weeks** |
| Monetization | — | Free |
| Size | 10 MB | 46 MB |
| Requires iOS | **15.6** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 17+ |
| Developer | [Perry Hooker](https://appshunter.io/developer/1827290197) | [Upright Science, Inc](https://appshunter.io/developer/1882993374) |

## What reviewers say

### Ankle Flex

[App page](https://appshunter.io/ios/app/ankle-flex/id6748759970)

**Features:** macOS Compatibility

**In-app purchases:** none


### StayUpRight!

[App page](https://appshunter.io/ios/app/stayupright/id6761411871)

Measure your balance using your phone's sensors. Track scores over time and sync with Apple Health data like sleep and steps. This app helps you monitor postural sway to understand your balance capabilities.

**Highlights:** Balance measurement via phone sensors, Postural sway quantification, Three simple balance poses, Score tracking over time, Apple Health data sync, Audio and written instructions

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

**In-app purchases:** none


## Frequently asked questions

### Is Ankle Flex free?

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

### Is StayUpRight! free?

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

### Do Ankle Flex or StayUpRight! have ads?

Neither Ankle Flex nor StayUpRight! shows ads.

### Which is updated more often, Ankle Flex or StayUpRight!?

Ankle Flex ships an update every 5 months, and StayUpRight! every 2 weeks. Most recently, Ankle Flex was updated on October 28, 2026 and StayUpRight! on October 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.*