# ZT vs EnerGO

The clearest difference is review sentiment: EnerGO at 43% against ZT's 11%. EnerGO also leads on rating (4.8 vs 4.6) and ratings volume (790 vs 212). ZT's advantage is monetization model (free vs free with in-app purchases) and iOS requirement (12.0 vs 15.1). On price, update cadence, ads and in-app purchases there is nothing between them.

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

EnerGO holds the better App Store score, 4.8 against 4.6. Both are backed by a comparable volume of ratings — 212 and 790 respectively. Written reviews point the same way: 11% of ZT's written reviews are positive against 43% of EnerGO's.

ZT ships an update every 3 weeks, EnerGO monthly. The most recent releases landed on September 24, 2026 and September 25, 2026 respectively.

## The numbers

| Metric | ZT | EnerGO |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.6 (212 ratings)](https://appshunter.io/ios/app/zt/id1214656147/reviews) | **[4.8 (790 ratings)](https://appshunter.io/ios/app/energo/id1507114521/reviews)** |
| Number of ratings | 212 | **790** |
| Positive reviews | 11.1% of reviews | **42.7% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Monthly |
| Monetization | **Free** | Free with in-app purchases |
| Size | 121 MB | 91 MB |
| Requires iOS | **12.0** | 15.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [ZTK, OOO](https://appshunter.io/developer/1577726159) | [Energo Technologies](https://appshunter.io/developer/1507114520) |

## 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


### EnerGO

[App page](https://appshunter.io/ios/app/energo/id1507114521)

Never let a dead phone stop you. Find and rent portable chargers from thousands of stations located in malls, cafes, and transport hubs. Simply scan a QR code to rent a power bank and return it at any convenient location.

**Highlights:** Find rental stations on a map, Rent power banks via QR code, Return power banks at any station, Power banks with Type-C, micro-USB, and Lightning cables, Quick registration with phone number and card

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

**In-app purchases:** none


## Frequently asked questions

### Is ZT free?

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

### Is EnerGO free?

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

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

EnerGO is rated higher. ZT averages 4.6 out of 5 from 212 ratings, while EnerGO averages 4.8 from 790 ratings.

### Do ZT or EnerGO have ads?

Neither ZT nor EnerGO shows ads.

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

ZT ships an update every 3 weeks, and EnerGO monthly. Most recently, ZT was updated on September 24, 2026 and EnerGO on September 25, 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.*