# 识之 vs 压缩专家

The clearest difference is iOS requirement: 识之 at 10.0 against 压缩专家's 14.0. On price, update cadence, ads and in-app purchases there is nothing between them.

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

识之 ships an update every 3 months, 压缩专家 every 2 months. The most recent releases landed on October 26, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | 识之 | 压缩专家 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.2 (76 ratings)](https://appshunter.io/ios/app/id1482479741/reviews)** |
| Number of ratings | — | **76** |
| Positive reviews | — | 62.5% of reviews |
| In-app purchases | No | No |
| Ads | Yes | Yes |
| Update frequency | Every 3 months | **Every 2 months** |
| Monetization | — | Ad-supported |
| Size | 53 MB | 98 MB |
| Requires iOS | **10.0** | 14.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [亮 钟](https://appshunter.io/developer/1437141355) | [岚 赵](https://appshunter.io/developer/1352261434) |

## What reviewers say

### 识之

[App page](https://appshunter.io/ios/app/ai/id1441597334)

**Features:** macOS Compatibility

**In-app purchases:** none


### 压缩专家

[App page](https://appshunter.io/ios/app/id1482479741)

This tool efficiently compresses various file types including documents, videos, audio, and images. It helps optimize phone storage by cleaning up duplicate photos and unnecessary data, making file transfer and sharing easier.

**Highlights:** Full-format file compression, Quick packaging and sharing, Intelligent photo album optimization, Deep phone storage cleanup, Supports documents, videos, audio, images, PDFs, GIFs

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

**In-app purchases:** none


## Frequently asked questions

### Is 识之 free?

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

### Is 压缩专家 free?

压缩专家 is free to download, with no in-app purchases.

### Do 识之 or 压缩专家 have ads?

Both 识之 and 压缩专家 show ads.

### Which is updated more often, 识之 or 压缩专家?

识之 ships an update every 3 months, and 压缩专家 every 2 months. Most recently, 识之 was updated on October 26, 2026 and 压缩专家 on November 3, 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.*