# 知到. vs 51论文查重

The clearest difference is rating: 51论文查重 at 5.0 against 知到.'s 1.2. 51论文查重 also leads on iOS requirement (11.0 vs 14.0). 知到.'s advantage is monetization model (free vs free with in-app purchases) and ratings volume (320 vs 2). On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. 知到. sells 11 in-app purchases, starting at $1.99 per month and 51论文查重 sells 10 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

51论文查重 holds the better App Store score, 5.0 against 1.2. That said, the two scores are not equally well evidenced: 知到. has 320 ratings behind it against 2, so its average is the more settled of the two.

知到. ships an update every 3 weeks, 51论文查重 fortnightly. The most recent releases landed on September 23, 2026 and September 8, 2026 respectively.

## The numbers

| Metric | 知到. | 51论文查重 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [1.2 (320 ratings)](https://appshunter.io/ios/app/id1255358463/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/51/id1497273923/reviews)** |
| Number of ratings | **320** | 2 |
| Positive reviews | 19.6% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Fortnightly** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 393 MB | 25 MB |
| Requires iOS | 14.0 | **11.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [上海卓越睿新数码科技有限公司](https://appshunter.io/developer/702650874) | [Beijing Jiangao Technology Co., Ltd.](https://appshunter.io/developer/1497273922) |

## What reviewers say

### 知到.

[App page](https://appshunter.io/ios/app/id1255358463)

Access a vast library of high-quality courses from over 2,000 universities worldwide. This platform aims to share educational resources and help users improve themselves with daily lessons from experts.

**Highlights:** Extensive course library, University-level content, Expert instructors, Daily learning sessions, Personal development focus

**Features:** Vision Pro support

**In-app purchases (11)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 知到VIP会员 | $1.99 | per month |
| 6课程商品 | $0.99 | one-time |
| 知到VIP会员(新特惠价1) | $0.99 | one-time |
| 18课程商品 | $2.99 | one-time |
| 30课程商品 | $3.99 | one-time |
| 50课程商品 | $6.99 | one-time |
| 68课程商品 | $9.99 | one-time |
| 智慧树VIP会员(年卡学生价) | $24.99 | one-time |
| 198课程商品 | $29.99 | one-time |
| 知到VIP会员 | $29.99 | one-time |
| 588课程商品 | $79.99 | one-time |

**What reviewers like**

- 👍 Provides access to learning resources
- 👍 Offers a platform for academic exchange
- 👍 Free to download and access content
- 👍 Useful for supplementary learning
- 👍 Good for utilizing spare time for learning

**What reviewers complain about**

- 👎 Forced updates
- 👎 Poor server performance
- 👎 Frequent crashes and freezes
- 👎 Bad user interface and experience
- 👎 Inconvenient login and verification process

**Reported bugs**

- App crashes frequently
- App freezes or becomes unresponsive
- Video playback issues (no sound, auto-pause, content not counting)
- Login and verification process is problematic
- Exams end prematurely

**Requested features**

- Develop an iPad/tablet version
- Improve server stability and performance
- Offer a delayed update option
- Allow users to choose whether to rate courses
- Implement a proper rating system for courses


### 51论文查重

[App page](https://appshunter.io/ios/app/51/id1497273923)

This app helps students and academics check their papers for plagiarism. It offers fast and accurate detection against a vast database, assisting with revisions to improve acceptance rates for various academic works.

**Highlights:** Plagiarism detection, Paper revision assistance, Extensive comparison database, Fast and accurate results, Supports various academic paper types, Improves paper acceptance rates

**Features:** macOS Compatibility

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 论文查重12元/篇 | $1.99 | one-time |
| 论文降重93元 | $13.99 | one-time |
| 论文降重98元 | $14.99 | one-time |
| 论文降重108元 | $15.99 | one-time |
| 论文降重113元 | $16.99 | one-time |
| 论文降重118元 | $17.99 | one-time |
| 论文降重123元 | $18.99 | one-time |
| 论文降重128元 | $19.99 | one-time |
| 论文降重138元 | $20.99 | one-time |
| 论文降重148元 | $21.99 | one-time |


## Frequently asked questions

### Is 知到. free?

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

### Is 51论文查重 free?

51论文查重 is free to download, with in-app purchases available.

### Which has better reviews, 知到. or 51论文查重?

51论文查重 is rated higher. 知到. averages 1.2 out of 5 from 320 ratings, while 51论文查重 averages 5.0 from 2 ratings.

### Do 知到. or 51论文查重 have ads?

Neither 知到. nor 51论文查重 shows ads.

### Which is updated more often, 知到. or 51论文查重?

知到. ships an update every 3 weeks, and 51论文查重 fortnightly. Most recently, 知到. was updated on September 23, 2026 and 51论文查重 on September 8, 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.*