# J vs Sonar

The clearest difference is update cadence: Sonar at every 9 days against J's every 2 months. Sonar also leads on device support (3 vs 1). On price, ads, in-app purchases and iOS requirement there is nothing between them.

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

J ships an update every 2 months, Sonar every 9 days. The most recent releases landed on October 24, 2026 and October 23, 2026 respectively.

## The numbers

| Metric | J | Sonar |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 9 days** |
| Size | 75 MB | 15 MB |
| Requires iOS | **16.0** | 17.0 |
| Devices | iPhone | **iPhone, iPad, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [JUZ40 ONLINE, TOO](https://appshunter.io/developer/1833670091) | [Ivan Kudryavtsev](https://appshunter.io/developer/1896682098) |

## What reviewers say

### J

[App page](https://appshunter.io/ios/app/j-staff/id6754760953)

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

**In-app purchases:** none


### Sonar

[App page](https://appshunter.io/ios/app/sonar/id6769999004)

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is J free?

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

### Is Sonar free?

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

### Do J or Sonar have ads?

Neither J nor Sonar shows ads.

### Which is updated more often, J or Sonar?

J ships an update every 2 months, and Sonar every 9 days. Most recently, J was updated on October 24, 2026 and Sonar on October 23, 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.*