Polygon ID vs ZSTL
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Polygon ID
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.
- Create and manage digital identity
- Prove access rights privately
- Manage verifiable claims
- Generate private proofs
- Secure authentication (biometrics/PIN)
- Identity recovery with seed phrase
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Polygon ID enables you to create and manage your own self-sovereign digital identity. Prove your access rights and reputation without revealing any of your personal information. Manage verifiable claims about your identity and generate private proofs for digital interactions. Polygon ID is an open-source and private by default identity system based on zero-knowledge cryptography (zkSNARK). With the Polygon ID app, you will have access to web3 and web2 services and the ability for private on-chain verifications. Convenient control: - Secure authentication with biometrics or a 6-digit PIN - Identity recovery with seed phrase mechanism Obtaining claims: - Scan an issuer’s QR code - Follow the steps to connect your identity with the issuer and retrieve your claims - Store and manage your claims from your wallet Presenting your private proofs: - Scan a verifier’s QR code - Accept the proof request presented in your wallet - Generate and share the private proof of your claims with the verifier.
ZSTL
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.
- QR code device recognition
- Quick Bluetooth pairing
- One-tap unlocking
- Supports various smart devices
- Secure encrypted connections
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This is a smart and convenient unlocking tool designed specifically for devices that support QR code and Bluetooth connectivity. With just a simple scan, users can quickly pair via Bluetooth and unlock the device — efficiently, securely, and effortlessly. Whether it's a shared bike, smart lock, or smart cabinet, we deliver a fast and stable connection experience tailored for your needs. Key Features: Automatically recognize devices by scanning QR codes Quick Bluetooth pairing without complicated setup One-tap unlock with lightning-fast response Supports various types of smart devices Secure encrypted connections to protect your data Download now and step into a smarter, more convenient lifestyle!
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Polygon ID | ZSTL |
|---|---|---|
| Price | Free | Free |
| Rating | 4.3 (7 ratings) | 4.7 (3 ratings) — better |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 7 — better | 3 |
| Update frequency | Every 3 weeks — better | Every 2 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 14.0 | 12.0 — better |
| Further details — not scored | ||
| Size | 156 MB | 44 MB |
| Age rating | 4+ | 4+ |
| Developer | ZKID Labs AG | 召 李 |
Customer experience
Polygon ID
ZSTL
In-app purchases
Polygon ID
No in-app purchases
ZSTL
No in-app purchases









