# ZK SmartKey vs SigmaPay Ng

The clearest difference is iOS requirement: ZK SmartKey at 9.0 against SigmaPay Ng's 12.0. On price, ads, in-app purchases and device support there is nothing between them.

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

## The numbers

| Metric | ZK SmartKey | SigmaPay Ng |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[1.7 (13 ratings)](https://appshunter.io/ios/app/zk-smartkey/id1399544296/reviews)** | — |
| Number of ratings | **13** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Monthly | — |
| Monetization | Free | — |
| Size | 145 MB | 128 MB |
| Requires iOS | **9.0** | 12.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [ZKTeco Inc.](https://appshunter.io/developer/955313767) | [Digipaxs Technology Limited](https://appshunter.io/developer/1815098071) |

## What reviewers say

### ZK SmartKey

[App page](https://appshunter.io/ios/app/zk-smartkey/id1399544296)

Manage your smart door locks from your mobile device. Grant temporary access, register users via fingerprint or PIN, and track entry records. Control lock volume and reset settings remotely.

**Highlights:** Visitor mode with temporary passcode sharing, User registration via fingerprint, card, or PIN, Access records check (who and when), Time zone access control, Adjustable volume settings (high, low, mute), Remote lock initialization and normal open, Real-time battery status monitoring

**In-app purchases:** none


### SigmaPay Ng

[App page](https://appshunter.io/ios/app/sigmapay-ng/id6746730535)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is ZK SmartKey free?

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

### Is SigmaPay Ng free?

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

### Do ZK SmartKey or SigmaPay Ng have ads?

Neither ZK SmartKey nor SigmaPay Ng shows ads.

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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.*