# 图片格式转换 vs 知言

The clearest difference is in-app purchases: 知言 at none against 图片格式转换's 3. 知言 also leads on iOS requirement (12.0 vs 16.0). 图片格式转换's advantage is device support. On price there is nothing between them.

Both are free to download. 图片格式转换 sells 3 in-app purchases, starting at $3.99 per month. 知言 asks for nothing beyond the download.

## The numbers

| Metric | 图片格式转换 | 知言 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/ai/id6450945948/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | Yes | — |
| Update frequency | Weekly | — |
| Monetization | — | Free |
| Size | 61 MB | 36 MB |
| Requires iOS | 16.0 | **12.0** |
| Devices | **iPhone, iPad** | — |
| Age rating | 4+ | 4+ |
| Developer | [子豪 张](https://appshunter.io/developer/1625809217) | [祥利 管](https://appshunter.io/developer/1553028619) |

## What reviewers say

### 图片格式转换

[App page](https://appshunter.io/ios/app/id6446273369)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Month Membership | $3.99 | per month |
| Season Membership | $9.99 | per 3 months |
| Year Membership | $19.99 | per year |


### 知言

[App page](https://appshunter.io/ios/app/ai/id6450945948)

This AI prompt assistant offers a vast library of tested templates for content creators, programmers, job seekers, and AI users. It helps users communicate more effectively with AI tools to solve problems, generate code, draft content, and find inspiration.

**Highlights:** Extensive prompt templates, Tested and verified content, Clear categorization, One-click copy and use, Continuous updates, Supports writing, coding, and more

**In-app purchases:** none


## Frequently asked questions

### Is 图片格式转换 free?

图片格式转换 is free to download, with in-app purchases available.

### Is 知言 free?

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

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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.*