# 卓信签 vs Focus.AI

The clearest difference is in-app purchases: 卓信签 at none against Focus.AI's 3. 卓信签 also leads on ads (none vs shown) and iOS requirement (10.0 vs 16). Focus.AI's advantage is update cadence (every 3 days vs every 3 months). On price and device support there is nothing between them.

Both are free to download. Focus.AI sells 3 in-app purchases, starting at $1.99 per month. 卓信签 asks for nothing beyond the download.

卓信签 ships an update every 3 months, Focus.AI every 3 days. The most recent releases landed on November 3, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | 卓信签 | Focus.AI |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 3 months | **Every 3 days** |
| Size | 11 MB | 32 MB |
| Requires iOS | **10.0** | 16 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 4+ |
| Developer | [山东卓码信息技术有限公司](https://appshunter.io/developer/1484067461) | [永生 刘](https://appshunter.io/developer/830484999) |

## What reviewers say

### 卓信签

[App page](https://appshunter.io/ios/app/id1560956043)

**Features:** macOS Compatibility

**In-app purchases:** none


### Focus.AI

[App page](https://appshunter.io/ios/app/focusai-track-progress/id6751448871)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Plan | $1.99 | per month |
| Quarterly Plan | $5.99 | per 3 months |
| Annual Plan | $17.99 | per year |


## Frequently asked questions

### Is 卓信签 free?

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

### Is Focus.AI free?

Focus.AI is free to download, with in-app purchases available.

### Do 卓信签 or Focus.AI have ads?

Focus.AI shows ads; 卓信签 does not.

### Which is updated more often, 卓信签 or Focus.AI?

卓信签 ships an update every 3 months, and Focus.AI every 3 days. Most recently, 卓信签 was updated on November 3, 2026 and Focus.AI on October 28, 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.*