# Tennis.ru vs Gravity 21

The clearest difference is update cadence: Tennis.ru at fortnightly against Gravity 21's every 5 weeks. Gravity 21's advantage is review sentiment (100% vs 91%) and iOS requirement (13.4 vs 15.1). On price, ads, in-app purchases and monetization model there is nothing between them.

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

Tennis.ru ships an update fortnightly, Gravity 21 every 5 weeks. Both last shipped on November 3, 2026.

## The numbers

| Metric | Tennis.ru | Gravity 21 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (3 ratings)](https://appshunter.io/ios/app/tennisru/id1489443589/reviews)** | — |
| Number of ratings | **3** | — |
| Positive reviews | 91.5% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 5 weeks |
| Monetization | Free | Free |
| Size | 52 MB | 29 MB |
| Requires iOS | 15.1 | **13.4** |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Alexey Bayankin](https://appshunter.io/developer/1489443588) | [Fitbase](https://appshunter.io/developer/1530906929) |

## What reviewers say

### Tennis.ru

[App page](https://appshunter.io/ios/app/tennisru/id1489443589)

Easily book tennis and padel courts, find training partners, and reserve equipment at a large, modern sports club. The app offers a user-friendly interface for remote booking and payment, making your sports activities more convenient.

**Highlights:** Court rental for tennis and padel, Find sparring partners, Book training sessions, Rent sports equipment, Remote booking and payment, Club news and updates

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

**In-app purchases:** none


### Gravity 21

[App page](https://appshunter.io/ios/app/gravity-21/id1668987927)

Manage your fitness club memberships and class schedules. Book group sessions, receive workout reminders, and track your membership validity. Stay updated with your fitness journey.

**Highlights:** View workout schedules, Book group training sessions, Receive workout reminders, Track membership expiry, Manage club services

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Tennis.ru free?

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

### Is Gravity 21 free?

Gravity 21 is free to download, with no in-app purchases.

### Do Tennis.ru or Gravity 21 have ads?

Neither Tennis.ru nor Gravity 21 shows ads.

### Which is updated more often, Tennis.ru or Gravity 21?

Tennis.ru ships an update fortnightly, and Gravity 21 every 5 weeks. Most recently, Tennis.ru was updated on November 3, 2026 and Gravity 21 on November 3, 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.*