# Ultra Strong vs Flexibull

Ultra Strong and Flexibull are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Ultra Strong ships an update every 2 weeks, Flexibull fortnightly. The most recent releases landed on October 15, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | Ultra Strong | Flexibull |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/ultra-strong/id6451003305/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 weeks** | Fortnightly |
| Monetization | Free | — |
| Size | 74 MB | 76 MB |
| Requires iOS | 15.1 | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [PYRY JOHANNES LIUKKONEN](https://appshunter.io/developer/1696169555) | [Flexibull Fitness](https://appshunter.io/developer/1816282485) |

## What reviewers say

### Ultra Strong

[App page](https://appshunter.io/ios/app/ultra-strong/id6451003305)

This app offers a smart system for runners to improve performance and prevent injuries. It integrates strength training, technique drills, mobility exercises, and intelligent running programming into personalized plans.

**Highlights:** Integrated strength, technique, and mobility training, Intelligent running programming, Goal-based training plans, Exercise demonstration videos, Run logging and progress tracking, Community support

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

**In-app purchases:** none


### Flexibull

[App page](https://appshunter.io/ios/app/flexibull/id6746347632)

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

**In-app purchases:** none


## Frequently asked questions

### Is Ultra Strong free?

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

### Is Flexibull free?

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

### Do Ultra Strong or Flexibull have ads?

Neither Ultra Strong nor Flexibull shows ads.

### Which is updated more often, Ultra Strong or Flexibull?

Ultra Strong ships an update every 2 weeks, and Flexibull fortnightly. Most recently, Ultra Strong was updated on October 15, 2026 and Flexibull on October 13, 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.*