# 知道-公式定理大全错题本计划

> Reference app for formulas and theorems with cross-device sync. (iPhone/iPad app by Chongqing Freestyle Technology Co., Ltd.)

- Source: https://appshunter.io/ios/app/id1566718185 (this page in markdown: same URL + `.md`)
- Developer: [Chongqing Freestyle Technology Co., Ltd](https://appshunter.io/developer/1536263272)
- Category: Reference, Education
- Price: Free with in-app purchases
- Rating: 5.00/5 from 3 App Store ratings
- Age rating: 4+
- Requires: iOS 12.0 · 120 MB
- Languages: Chinese
- Released: 2021-05-13
- Data updated: 2026-06-10
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/id1566718185/reviews.md

## What is 知道?

提供准确、标准、美观的公式定理搜索、查看。
跨设备数据同步，让你随时随地都可以学习。
内容丰富，未来，知道将持续不断的增加公式内容。

## Key features

- Accurate formula and theorem search
- Standardized and aesthetic presentation
- Cross-device data synchronization
- Extensive and growing content library
- Study planning tools

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| 包月会员 | $0.99 | one-time |
| 包年会员 | $1.99 | one-time |



## Frequently asked questions about 知道

### What is 知道?

知道 is a reference application that provides accurate, standardized, and aesthetically pleasing formulas and theorems. It also offers cross-device data synchronization and study planning features.

### What kind of content does 知道 offer?

知道 offers a rich collection of formulas and theorems across various subjects. The developers plan to continuously add more content to the app in the future.

### Can I use 知道 on multiple devices?

Yes, 知道 supports cross-device data synchronization, allowing you to access your learning progress and notes from any of your supported devices.

### Is 知道 free to use?

Yes, 知道 is free to download and use. It also includes in-app purchases for additional features or content.

### Does 知道 have ads?

Yes, 知道 contains advertisements to support its free service.

### What devices is 知道 compatible with?

知道 is available for iPhone, iPad, and iPod devices.

### How often is 知道 updated?

The latest version of 知道 is 6.1.9, and it was last updated on March 20, 2024. Updates are released regularly to improve the app and add new content.

### What is the age rating for 知道?

知道 has an age rating of 4+, making it suitable for a wide range of users.

## Version history (last 5 releases)

### 6.1.9 — 2024-03-20

1、ui细节修复

### 6.1.8 — 2024-01-10

1、bug 修复

### 6.1.7 — 2023-12-13

1、ui细节修复

### 6.1.6 — 2023-11-16

1、bug修复

### 6.1.4 — 2023-07-13

1、ui细节更新。

## Apps similar to 知道

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Chemistry Answers](https://appshunter.io/ios/app/chemistry-answers/id1502837305) | 3.2 (37) | Free | Reference |
| [长相思-赏诗词之美](https://appshunter.io/ios/app/id1600622338) | 4.7 (61) | Free | Reference |

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-10.*