# 卓信签Pro vs Notta

The clearest difference is update cadence: Notta at weekly against 卓信签Pro's every 2 months. 卓信签Pro's advantage is iOS requirement (10.0 vs 16.6). 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.

卓信签Pro ships an update every 2 months, Notta weekly. The most recent releases landed on October 19, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | 卓信签Pro | Notta |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Weekly** |
| Size | 12 MB | 27 MB |
| Requires iOS | **10.0** | 16.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [山东卓码信息技术有限公司](https://appshunter.io/developer/1484067461) | [嘉奇 龙](https://appshunter.io/developer/1787171315) |

## What reviewers say

### 卓信签Pro

[App page](https://appshunter.io/ios/app/pro/id1610080599)

**Features:** macOS Compatibility

**In-app purchases:** none


### Notta

[App page](https://appshunter.io/ios/app/notta/id6794847648)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is 卓信签Pro free?

卓信签Pro is free to download, with no in-app purchases.

### Is Notta free?

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

### Do 卓信签Pro or Notta have ads?

Neither 卓信签Pro nor Notta shows ads.

### Which is updated more often, 卓信签Pro or Notta?

卓信签Pro ships an update every 2 months, and Notta weekly. Most recently, 卓信签Pro was updated on October 19, 2026 and Notta on October 6, 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.*