# InLab vs JustStretch | Flex & Mobility

The clearest difference is review sentiment: JustStretch | Flex & Mobility at 64% against InLab's 0%. JustStretch | Flex & Mobility also leads on rating (4.7 vs 1.0) and ratings volume (2.4K vs 1). InLab's advantage is in-app purchases (none vs 18) and ads (none vs shown). On price 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. InLab asks for nothing beyond the download.

JustStretch | Flex & Mobility holds the better App Store score, 4.7 against 1.0. 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. Written reviews point the same way: 0% of InLab's written reviews are positive against 64% of JustStretch | Flex & Mobility's.

InLab ships an update every 3 months, JustStretch | Flex & Mobility every 3 weeks. The most recent releases landed on October 24, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | InLab | JustStretch | Flex & Mobility |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [1.0 (1 ratings)](https://appshunter.io/ios/app/inlab-growth-diary/id1091424868/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 | 0.0% of reviews | **64.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 3 months | **Every 3 weeks** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 10 MB | 104 MB |
| Requires iOS | **7.0** | 13.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [InBody Co., Ltd.](https://appshunter.io/developer/524989563) | [TechPioneers Limited](https://appshunter.io/developer/1760674678) |

## What reviewers say

### InLab

[App page](https://appshunter.io/ios/app/inlab-growth-diary/id1091424868)

Track your child's height and weight progress with this app. Monitor growth against standard curves using detailed graphs and reports. Manage multiple children's data easily by entering their birth dates.

**Highlights:** Record height and weight, Monitor growth against standard curves, Detailed graphs and reports, Manage multiple children, Simple design

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

**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 InLab free?

InLab 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, InLab or JustStretch | Flex & Mobility?

JustStretch | Flex & Mobility is rated higher. InLab averages 1.0 out of 5 from 1 ratings, while JustStretch | Flex & Mobility averages 4.7 from 2.4K ratings.

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

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

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

InLab ships an update every 3 months, and JustStretch | Flex & Mobility every 3 weeks. Most recently, InLab was updated on October 24, 2026 and JustStretch | Flex & Mobility on October 30, 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.*