# ZT vs JAZZER

The clearest difference is update cadence: ZT at every 3 weeks against JAZZER's every 6 weeks. On price, ads, in-app purchases and device support there is nothing between them.

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

ZT ships an update every 3 weeks, JAZZER every 6 weeks. The most recent releases landed on September 24, 2026 and September 21, 2026 respectively.

## The numbers

| Metric | ZT | JAZZER |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (212 ratings)](https://appshunter.io/ios/app/zt/id1214656147/reviews)** | — |
| Number of ratings | **212** | — |
| Positive reviews | 11.1% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 6 weeks |
| Monetization | Free | — |
| Size | 121 MB | 25 MB |
| Requires iOS | 12.0 | 12.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 17+ |
| Developer | [ZTK, OOO](https://appshunter.io/developer/1577726159) | [ShenZhen SYL Technology CO.,Ltd](https://appshunter.io/developer/1619732209) |

## What reviewers say

### ZT

[App page](https://appshunter.io/ios/app/zt/id1214656147)

Connect with incarcerated individuals through a comprehensive mobile service. Send letters, photos, make audio/video calls, and transfer funds. Offers entertainment options like puzzles and games to enrich communication.

**Highlights:** Send electronic letters and photos, Make audio and video calls, Transfer money to inmate accounts, Add puzzles and games to letters, Instant printing at correctional facilities

**Features:** Vision Pro support

**In-app purchases:** none


### JAZZER

[App page](https://appshunter.io/ios/app/jazzer/id6449239498)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is ZT free?

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

### Is JAZZER free?

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

### Do ZT or JAZZER have ads?

Neither ZT nor JAZZER shows ads.

### Which is updated more often, ZT or JAZZER?

ZT ships an update every 3 weeks, and JAZZER every 6 weeks. Most recently, ZT was updated on September 24, 2026 and JAZZER on September 21, 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.*