# ZT vs Юволт

The clearest difference is rating: Юволт at 5.0 against ZT's 4.6. Юволт also leads on review sentiment (40% vs 18%) and update cadence (weekly vs every 3 weeks). ZT's advantage is ratings volume (292 vs 1) and iOS requirement (12.0 vs 14.0). 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.

Юволт holds the better App Store score, 5.0 against 4.6. That said, the two scores are not equally well evidenced: ZT has 292 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 18% of ZT's written reviews are positive against 40% of Юволт's.

ZT ships an update every 3 weeks, Юволт weekly. The most recent releases landed on November 6, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | ZT | Юволт |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.6 (292 ratings)](https://appshunter.io/ios/app/zt/id1214656147/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/id6657960288/reviews)** |
| Number of ratings | **292** | 1 |
| Positive reviews | 18.5% of reviews | **40.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Weekly** |
| Monetization | Free | — |
| Size | 121 MB | 48 MB |
| Requires iOS | **12.0** | 14.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [ZTK, OOO](https://appshunter.io/developer/1577726159) | [Maksim Egoshin](https://appshunter.io/developer/1764418377) |

## 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


### Юволт

[App page](https://appshunter.io/ios/app/id6657960288)

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

**In-app purchases:** none


## Frequently asked questions

### Is ZT free?

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

### Is Юволт free?

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

### Which has better reviews, ZT or Юволт?

Юволт is rated higher. ZT averages 4.6 out of 5 from 292 ratings, while Юволт averages 5.0 from 1 ratings.

### Do ZT or Юволт have ads?

Neither ZT nor Юволт shows ads.

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

ZT ships an update every 3 weeks, and Юволт weekly. Most recently, ZT was updated on November 6, 2026 and Юволт on November 4, 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.*