# G21 vs Styku

The clearest difference is rating: Styku at 4.7 against G21's 3.7. Styku also leads on ads (none vs shown) and ratings volume (250 vs 3). G21's advantage is in-app purchases (none vs 3). On price, update cadence, device support and iOS requirement there is nothing between them.

Both are free to download. Styku sells 3 in-app purchases, starting at $49.99 per 3 months. G21 asks for nothing beyond the download.

Styku holds the better App Store score, 4.7 against 3.7. That said, the two scores are not equally well evidenced: Styku has 250 ratings behind it against 3, so its average is the more settled of the two.

Both ship on a similar rhythm, roughly monthly. The most recent releases landed on September 30, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | G21 | Styku |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.7 (3 ratings)](https://appshunter.io/ios/app/g21/id1211311329/reviews) | **[4.7 (250 ratings)](https://appshunter.io/ios/app/styku/id1626065310/reviews)** |
| Number of ratings | 3 | **250** |
| Positive reviews | — | 55.6% of reviews |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | Monthly | Monthly |
| Monetization | **Ad-supported** | Free with in-app purchases |
| Size | 152 MB | 69 MB |
| Requires iOS | **14.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Gravity 21 Fort Lauderdale, LLC](https://appshunter.io/developer/1821273003) | [Styku LLC](https://appshunter.io/developer/1626065312) |

## What reviewers say

### G21

[App page](https://appshunter.io/ios/app/g21/id1211311329)

Easily plan and schedule your fitness classes directly from your mobile device. View class schedules, sign up for sessions, and access studio location information. Optimize your time and enjoy the convenience of managing your fitness activities on the go.

**Highlights:** View class schedules, Sign up for classes, Access studio location information, Optimize time management, Convenient mobile access

**Features:** macOS Compatibility, Apple Wallet

**In-app purchases:** none


### Styku

[App page](https://appshunter.io/ios/app/styku/id1626065310)

Visualize your body's transformation in 3D with advanced body scanning technology. Track key metrics beyond the scale, gain personalized wellness insights, and compare progress with dynamic side-by-side visuals. Understand your body's changes like never before.

**Highlights:** 3D body visualization, Wellness and shape insights, Track key body metrics, Compare scan progress, Non-invasive 3D scanning

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium 3 Months Plan | $49.99 | per 3 months |
| Premium 6 Months Plan | $79.99 | per 6 months |
| Premium Annual Plan | $99.99 | per year |


## Frequently asked questions

### Is G21 free?

G21 is free to download, with no in-app purchases.

### Is Styku free?

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

### Which has better reviews, G21 or Styku?

Styku is rated higher. G21 averages 3.7 out of 5 from 3 ratings, while Styku averages 4.7 from 250 ratings.

### Do G21 or Styku have ads?

G21 shows ads; Styku does not.

### Which is updated more often, G21 or Styku?

G21 ships an update monthly, and Styku monthly. Most recently, G21 was updated on September 30, 2026 and Styku on October 11, 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.*