# ZT vs StarLine 2

The clearest difference is rating: ZT at 4.7 against StarLine 2's 4.3. ZT also leads on iOS requirement (12.0 vs 16.0). On price, review sentiment, ratings volume and update cadence there is nothing between them.

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

ZT holds the better App Store score, 4.7 against 4.3. Both are backed by a comparable volume of ratings — 279 and 703 respectively. Written reviews complicate that: 19% of ZT's written reviews are positive against 26% of StarLine 2's, so the app with the better star average is not the one people write more warmly about.

ZT ships an update every 3 weeks, StarLine 2 monthly. Both last shipped on October 20, 2026.

## The numbers

| Metric | ZT | StarLine 2 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (279 ratings)](https://appshunter.io/ios/app/zt/id1214656147/reviews)** | [4.3 (703 ratings)](https://appshunter.io/ios/app/starline-2/id1463863869/reviews) |
| Number of ratings | 279 | **703** |
| Positive reviews | 19.4% of reviews | **25.6% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Monthly |
| Monetization | Free | Free |
| Size | 121 MB | 121 MB |
| Requires iOS | **12.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [ZTK, OOO](https://appshunter.io/developer/1577726159) | [StarLine LLC](https://appshunter.io/developer/492074740) |

## 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


### StarLine 2

[App page](https://appshunter.io/ios/app/starline-2/id1463863869)

Manage your car's security and settings remotely from your smartphone. Control alarm systems, start or stop the engine, and receive real-time alerts about your vehicle's status and events.

**Highlights:** Remote engine start/stop, Arm/disarm security system, Vehicle location tracking, Real-time event notifications, Valet mode, Anti-hijack mode, Sensor adjustment

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

**In-app purchases:** none

**What reviewers like**

- 🚀 Great app
- 🔒 Top security
- 👍 Well-designed app
- 👍 Fantastic bit of kit
- 👍 Convenient and functional

**What reviewers complain about**

- 🐛 Constant crashes
- 🐛 Frequent glitches
- 🐛 Unreliable auto-start
- 🐛 Inaccurate location tracking
- 🐛 Buggy after updates

**Reported bugs**

- App crashes on launch
- Bluetooth connectivity issues
- Incorrect balance display
- Disappearing UI elements
- Unreliable auto-start function

**Requested features**

- Add widget support
- Improve language options
- Enhance map and location features
- Customize alarm sounds
- Integrate with virtual assistants


## Frequently asked questions

### Is ZT free?

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

### Is StarLine 2 free?

StarLine 2 is free to download, with no in-app purchases.

### Which has better reviews, ZT or StarLine 2?

ZT is rated higher. ZT averages 4.7 out of 5 from 279 ratings, while StarLine 2 averages 4.3 from 703 ratings.

### Do ZT or StarLine 2 have ads?

Neither ZT nor StarLine 2 shows ads.

### Which is updated more often, ZT or StarLine 2?

ZT ships an update every 3 weeks, and StarLine 2 monthly. Most recently, ZT was updated on October 20, 2026 and StarLine 2 on October 20, 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.*