Comparison

Polygon ID vs ZSTL

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

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
Read full description

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.

About

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.

Highlights
  • QR code device recognition
  • Quick Bluetooth pairing
  • One-tap unlocking
  • Supports various smart devices
  • Secure encrypted connections
Features
Read full description

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

Polygon ID4 screens
ZSTL2 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

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

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard3 real differences · 7 level
Polygon ID versus ZSTL: the parameters behind the verdict, then further details
ParameterPolygon IDZSTL
PriceFreeFree
Rating4.3 (7 ratings)4.7 (3 ratings) — better
Positive reviews100.0% of reviews—
Number of ratings7 — better3
Update frequencyEvery 3 weeks — betterEvery 2 months
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPad, iPod — betteriPhone, iPod
Requires iOS14.012.0 — better
Further details — not scored
Size156 MB44 MB
Age rating4+4+
DeveloperZKID Labs AG召 李

Customer experience

Polygon ID

All ratings7 ratings
Positive85.7%
Neutral0.0%
Negative14.3%
Written reviews3 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

ZSTL

All ratings3 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Polygon ID

No in-app purchases

None

ZSTL

No in-app purchases

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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