# Polygon ID vs ZSTL

The clearest difference is rating: ZSTL at 4.7 against Polygon ID's 4.3. ZSTL also leads on iOS requirement (12.0 vs 14.0). Polygon ID's advantage is update cadence (every 3 weeks vs every 2 months). On price, ratings volume, 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.

ZSTL holds the better App Store score, 4.7 against 4.3. Both are backed by a comparable volume of ratings — 7 and 3 respectively.

Polygon ID ships an update every 3 weeks, ZSTL every 2 months. The most recent releases landed on June 6, 2026 and June 11, 2026 respectively.

## The numbers

| Metric | Polygon ID | ZSTL |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.3 (7 ratings)](https://appshunter.io/ios/app/polygon-id/id1629870183/reviews) | **[4.7 (3 ratings)](https://appshunter.io/ios/app/zstl/id6745016964/reviews)** |
| Number of ratings | **7** | 3 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 2 months |
| Monetization | Free | Free |
| Size | 156 MB | 44 MB |
| Requires iOS | 14.0 | **12.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [ZKID Labs AG](https://appshunter.io/developer/1691328887) | [召 李](https://appshunter.io/developer/1740123808) |

## What reviewers say

### Polygon ID

[App page](https://appshunter.io/ios/app/polygon-id/id1629870183)

Create and manage your self-sovereign digital identity. Prove access rights and reputation privately using zero-knowledge cryptography. Access web3 and web2 services with secure, private on-chain verifications.

**Highlights:** Create and manage digital identity, Prove access rights privately, Manage verifiable claims, Generate private proofs, Secure authentication (biometrics/PIN), Identity recovery with seed phrase

**In-app purchases:** none


### ZSTL

[App page](https://appshunter.io/ios/app/zstl/id6745016964)

This tool simplifies device access using QR codes and Bluetooth. It offers quick pairing and one-tap unlocking for various smart devices, ensuring a secure and efficient connection experience.

**Highlights:** QR code device recognition, Quick Bluetooth pairing, One-tap unlocking, Supports various smart devices, Secure encrypted connections

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Polygon ID free?

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

### Is ZSTL free?

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

### Which has better reviews, Polygon ID or ZSTL?

ZSTL is rated higher. Polygon ID averages 4.3 out of 5 from 7 ratings, while ZSTL averages 4.7 from 3 ratings.

### Do Polygon ID or ZSTL have ads?

Neither Polygon ID nor ZSTL shows ads.

### Which is updated more often, Polygon ID or ZSTL?

Polygon ID ships an update every 3 weeks, and ZSTL every 2 months. Most recently, Polygon ID was updated on June 6, 2026 and ZSTL on June 11, 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.*