# JustStretch | Flex & Mobility vs MuscleUp

The clearest difference is ads: MuscleUp at none against JustStretch | Flex & Mobility's shown. JustStretch | Flex & Mobility's advantage is review sentiment (64% vs 50%) and ratings volume (2.4K vs 393). On price, rating, update cadence and in-app purchases there is nothing between them.

Both are free to download. JustStretch | Flex & Mobility sells 10 in-app purchases, starting at $9.99 per month and MuscleUp sells 5 in-app purchases, starting at $6.99 per 7 days. Whichever you choose, the download price is not the number that matters.

On the App Store both sit at effectively the same score — 4.7 for JustStretch | Flex & Mobility against 4.8 for MuscleUp. That said, the two scores are not equally well evidenced: JustStretch | Flex & Mobility has 2.4K ratings behind it against 393, so its average is the more settled of the two. Written reviews are what separate them: 64% of JustStretch | Flex & Mobility's written reviews are positive against 50% of MuscleUp's.

JustStretch | Flex & Mobility ships an update every 3 weeks, MuscleUp every 10 days. The most recent releases landed on November 13, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | JustStretch | Flex & Mobility | MuscleUp |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.7 (2.4K ratings)](https://appshunter.io/ios/app/juststretch-flex-and-mobility/id6737028992/reviews) | **[4.8 (393 ratings)](https://appshunter.io/ios/app/muscleup-workout-planner/id6738424338/reviews)** |
| Number of ratings | **2.4K** | 393 |
| Positive reviews | **64.1% of reviews** | 50.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 3 weeks | **Every 10 days** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 104 MB | 131 MB |
| Requires iOS | 13.0 | **12.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 17+ | 17+ |
| Developer | [TechPioneers Limited](https://appshunter.io/developer/1760674678) | [DEEP FLOW SOFTWARE SERVICES](https://appshunter.io/developer/1833881740) |

## What reviewers say

### JustStretch | Flex & Mobility

[App page](https://appshunter.io/ios/app/juststretch-flex-and-mobility/id6737028992)

This app helps you build a daily stretching habit to improve flexibility, relieve pain, and boost overall well-being. It offers guided routines, custom workout creation, and multimedia instructions for all fitness levels.

**Highlights:** Daily stretching routines, Custom workout creation, Audio, image, and video guidance, Live instructor experience, Pain relief and injury prevention, Improved posture and sleep

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

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1 Month Premium | $9.99 | per month |
| 1 Month Premium | $19.99 | per month |
| 3 Months Premium | $19.99 | per 3 months |
| 3 Months Premium | $29.99 | per 3 months |
| 12 Months Premium | $29.99 | per year |
| LUCKY DRAW PRIZE | $29.99 | per year |
| 12 Months Premium | $35.99 | per year |
| 12 Months Premium | $37.99 | per year |
| One Year Membership | $39.99 | per year |
| 12 Months Premium | $47.99 | per year |

**What reviewers like**

- 🤸‍♀️ Effective stretching routines
- 💪 Variety of exercises
- 🕰️ Guided sessions
- 🌟 Helpful for pain relief

**What reviewers complain about**

- 💰 Requires paid subscription
- 🚫 No free trial
- 🐛 App crashes and bugs
- 🤔 Inconsistent program design

**Reported bugs**

- App not working after latest update
- Inability to open app on certain devices

**Requested features**

- Preparation time before transitions
- Ability to use app on multiple devices


### MuscleUp

[App page](https://appshunter.io/ios/app/muscleup-workout-planner/id6738424338)

Create personalized workout plans for any fitness level and track your strength-building progress. Whether you train at the gym or at home, this app helps you achieve your fitness goals.

**Highlights:** Personalized workout plans, Customizable for fitness level, Real-time progress tracking, Strength building monitoring, Gym and home workout routines

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

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| MuscleUp Premium 1 Week | $6.99 | per 7 days |
| MuscleUp Premium 1 Week | $6.99 | per 7 days |
| MUSLEUP PREMIUM | $9.99 | per 7 days |
| MUSLEUP PREMIUM | $9.99 | per 7 days |
| MuscleUp Premium Yearly | $39.99 | per year |


## Frequently asked questions

### Is JustStretch | Flex & Mobility free?

JustStretch | Flex & Mobility is free to download, with in-app purchases available.

### Is MuscleUp free?

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

### Which has better reviews, JustStretch | Flex & Mobility or MuscleUp?

MuscleUp is rated higher. JustStretch | Flex & Mobility averages 4.7 out of 5 from 2.4K ratings, while MuscleUp averages 4.8 from 393 ratings.

### Do JustStretch | Flex & Mobility or MuscleUp have ads?

JustStretch | Flex & Mobility shows ads; MuscleUp does not.

### Which is updated more often, JustStretch | Flex & Mobility or MuscleUp?

JustStretch | Flex & Mobility ships an update every 3 weeks, and MuscleUp every 10 days. Most recently, JustStretch | Flex & Mobility was updated on November 13, 2026 and MuscleUp on November 4, 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.*