# Sculpt by Science vs JustStretch | Flex & Mobility

The clearest difference is in-app purchases: Sculpt by Science at none against JustStretch | Flex & Mobility's 18. Sculpt by Science also leads on ads (none vs shown) and rating (5.0 vs 4.7). JustStretch | Flex & Mobility's advantage is ratings volume (2.4K vs 1) and update cadence (every 3 weeks vs every 6 weeks). On price, monetization model and device support there is nothing between them.

Both are free to download. JustStretch | Flex & Mobility sells 17 in-app purchases, starting at $7.49 per month. Sculpt by Science asks for nothing beyond the download.

Sculpt by Science holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: JustStretch | Flex & Mobility has 2.4K ratings behind it against 1, so its average is the more settled of the two.

Sculpt by Science ships an update every 6 weeks, JustStretch | Flex & Mobility every 3 weeks. The most recent releases landed on October 30, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Sculpt by Science | JustStretch | Flex & Mobility |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/sculpt-by-science/id6633439975/reviews)** | [4.7 (2.4K ratings)](https://appshunter.io/ios/app/juststretch-flex-and-mobility/id6737028992/reviews) |
| Number of ratings | 1 | **2.4K** |
| Positive reviews | — | 64.1% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 6 weeks | **Every 3 weeks** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 51 MB | 104 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 17+ |
| Developer | [Michael Gino Diamonds](https://appshunter.io/developer/1762633125) | [TechPioneers Limited](https://appshunter.io/developer/1760674678) |

## What reviewers say

### Sculpt by Science

[App page](https://appshunter.io/ios/app/sculpt-by-science/id6633439975)

This app offers a science-backed approach to health and fitness, acting as a support system for sustainable transformations. It aims to help users optimize performance, mitigate health risks, and improve sleep quality, empowering them to achieve their ideal physique and well-being.

**Highlights:** Science-backed fitness strategies, Sustainable health transformations, Risk mitigation for diseases, Improved sleep quality, Personalized coaching plans, Dream physique achievement

**Features:** macOS Compatibility

**In-app purchases:** none


### 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 (17)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1 Month Premium | $7.49 | per month |
| 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 | $30.99 | 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 |
| 7-Day Free Trial | $47.99 | per year |
| one year membership | $49.99 | per year |
| 12 Months Premium | $89.99 | per year |
| Stretch Guide Ebook Bundle | $9.99 | one-time |
| Stretch Guide Ebook Bundle | $12.99 | one-time |

**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


## Frequently asked questions

### Is Sculpt by Science free?

Sculpt by Science is free to download, with no in-app purchases.

### Is JustStretch | Flex & Mobility free?

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

### Which has better reviews, Sculpt by Science or JustStretch | Flex & Mobility?

Sculpt by Science is rated higher. Sculpt by Science averages 5.0 out of 5 from 1 ratings, while JustStretch | Flex & Mobility averages 4.7 from 2.4K ratings.

### Do Sculpt by Science or JustStretch | Flex & Mobility have ads?

JustStretch | Flex & Mobility shows ads; Sculpt by Science does not.

### Which is updated more often, Sculpt by Science or JustStretch | Flex & Mobility?

Sculpt by Science ships an update every 6 weeks, and JustStretch | Flex & Mobility every 3 weeks. Most recently, Sculpt by Science was updated on October 30, 2026 and JustStretch | Flex & Mobility on October 31, 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.*