# 51论文查重 vs 无忧写作

The clearest difference is iOS requirement: 51论文查重 at 11.0 against 无忧写作's 15.0. On price, rating, ratings volume and update cadence there is nothing between them.

Both are free to download. 51论文查重 sells 10 one-off in-app purchases and 无忧写作 sells 5 in-app purchases, starting at $4.99 per 7 days. Whichever you choose, the download price is not the number that matters.

On the App Store both sit at effectively the same score — 5.0 for 51论文查重 against 5.0 for 无忧写作. Both are backed by a comparable volume of ratings — 2 and 1 respectively.

Both ship on a similar rhythm, roughly fortnightly. The most recent releases landed on September 8, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | 51论文查重 | 无忧写作 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (2 ratings)](https://appshunter.io/ios/app/51/id1497273923/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/ai/id6743647481/reviews) |
| Number of ratings | **2** | 1 |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Fortnightly | Fortnightly |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 25 MB | 62 MB |
| Requires iOS | **11.0** | 15.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 9+ |
| Developer | [Beijing Jiangao Technology Co., Ltd.](https://appshunter.io/developer/1497273922) | [祖恒 廖](https://appshunter.io/developer/1800609484) |

## What reviewers say

### 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 |


### 无忧写作

[App page](https://appshunter.io/ios/app/ai/id6743647481)

This AI-powered writing assistant helps users refine academic papers, remove AI detection markers, and generate creative content. It offers features like smart essay correction, scriptwriting, and a vast library of sample texts to inspire users.

**Highlights:** Academic paper polishing and plagiarism reduction, AI detection removal for natural-sounding text, Short script generation, Smart essay grading and suggestions, Extensive sample text library, AI-powered writing idea generation, Professional document writing assistance

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 周会员 | $4.99 | per 7 days |
| 周会员 | $7.99 | per 7 days |
| 月会员 | $14.99 | per month |
| 季会员 | $24.99 | per 3 months |
| 年会员 | $29.99 | per year |


## Frequently asked questions

### Is 51论文查重 free?

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

### Is 无忧写作 free?

无忧写作 is free to download, with in-app purchases available.

### Which has better reviews, 51论文查重 or 无忧写作?

51论文查重 and 无忧写作 are both rated 5.0 out of 5 on the App Store, from 2 and 1 ratings respectively.

### Do 51论文查重 or 无忧写作 have ads?

Neither 51论文查重 nor 无忧写作 shows ads.

### Which is updated more often, 51论文查重 or 无忧写作?

51论文查重 ships an update fortnightly, and 无忧写作 fortnightly. Most recently, 51论文查重 was updated on September 8, 2026 and 无忧写作 on October 2, 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.*