# Pythagoras Calculator vs 51论文查重

The clearest difference is rating: 51论文查重 at 5.0 against Pythagoras Calculator's 4.6. 51论文查重 also leads on iOS requirement (11.0 vs 15.0). Pythagoras Calculator's advantage is ratings volume (242 vs 2). On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Pythagoras Calculator sells 8 one-off in-app purchases 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 4.6. That said, the two scores are not equally well evidenced: Pythagoras Calculator has 242 ratings behind it against 2, so its average is the more settled of the two.

Pythagoras Calculator ships an update every 3 weeks, 51论文查重 fortnightly. The most recent releases landed on September 22, 2026 and September 8, 2026 respectively.

## The numbers

| Metric | Pythagoras Calculator | 51论文查重 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.6 (242 ratings)](https://appshunter.io/ios/app/pythagoras-calculator/id1270384222/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/51/id1497273923/reviews)** |
| Number of ratings | **242** | 2 |
| Positive reviews | 83.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Fortnightly** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 179 MB | 25 MB |
| Requires iOS | 15.0 | **11.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Glindemann, Sennoun, Langer GbR](https://appshunter.io/developer/1024972809) | [Beijing Jiangao Technology Co., Ltd.](https://appshunter.io/developer/1497273922) |

## What reviewers say

### Pythagoras Calculator

[App page](https://appshunter.io/ios/app/pythagoras-calculator/id1270384222)

Easily calculate any side of a right-angled triangle using the Pythagorean theorem. Input two sides to find the third, with all calculations saved in a history. Supports fractions and offers an ad-free option.

**Highlights:** Pythagorean theorem calculations, Calculate any of the three sides, History of calculations, Supports fraction input, Shareable solutions, Ad-free option

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

**In-app purchases (8)**

| Purchase | Price | Billing |
| --- | --- | --- |
| +30 User Tokens | $0.29 | one-time |
| +1 Convenience Token / 6h, max. +2 | $0.59 | one-time |
| +2 Convenience Tokens / 6h, max. +4 | $0.99 | one-time |
| +150 User Tokens | $0.99 | one-time |
| +300 User Tokens | $1.49 | one-time |
| +4 Convenience Tokens / 6h, max. +8 | $1.59 | one-time |
| Remove Ads | $1.99 | one-time |
| Lifetime Access | $1.99 | one-time |

**What reviewers like**

- 👍 Easy to use and simple interface
- ✅ Accurate calculations for Pythagorean theorem
- 📚 Shows step-by-step solutions for learning
- 🚀 Fast and efficient computation
- 💼 Useful for construction and woodworking projects

**What reviewers complain about**

- 📢 Intrusive and annoying advertisements
- 💳 Deceptive payment practices and fraudulent charges
- 🔐 Suspicious credit card requirements for access
- ⚠️ Forced rating prompts
- ❌ Limited functionality (only works with 2 known sides)

**Reported bugs**

- App crashes or fails to calculate
- Paid ad removal not working properly
- Fraudulent payment processing through third-party sites
- Occasional incorrect calculation results
- App not functioning on iPhone 5SE and older devices

**Requested features**

- Calculate triangle angles
- Support angle-based calculations with one side
- Better monetization without aggressive ads
- Improved ratings system
- Real-time results display


### 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 Pythagoras Calculator free?

Pythagoras Calculator 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, Pythagoras Calculator or 51论文查重?

51论文查重 is rated higher. Pythagoras Calculator averages 4.6 out of 5 from 242 ratings, while 51论文查重 averages 5.0 from 2 ratings.

### Do Pythagoras Calculator or 51论文查重 have ads?

Neither Pythagoras Calculator nor 51论文查重 shows ads.

### Which is updated more often, Pythagoras Calculator or 51论文查重?

Pythagoras Calculator ships an update every 3 weeks, and 51论文查重 fortnightly. Most recently, Pythagoras Calculator was updated on September 22, 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.*