# Pythagoras Calculator vs Tri

The clearest difference is ads: Pythagoras Calculator at none against Tri's shown. Pythagoras Calculator also leads on review sentiment (83% vs 67%) and ratings volume (248 vs 17). Tri's advantage is iOS requirement (12.0 vs 15.0). On price, rating, update cadence and in-app purchases there is nothing between them.

Both are free to download. Pythagoras Calculator sells 8 one-off in-app purchases and Tri sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

On the App Store both sit at effectively the same score — 4.6 for Pythagoras Calculator against 4.5 for Tri. That said, the two scores are not equally well evidenced: Pythagoras Calculator has 248 ratings behind it against 17, so its average is the more settled of the two. Written reviews are what separate them: 83% of Pythagoras Calculator's written reviews are positive against 67% of Tri's.

Pythagoras Calculator ships an update every 4 weeks, Tri every 2 months. The most recent releases landed on October 26, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Pythagoras Calculator | Tri |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (248 ratings)](https://appshunter.io/ios/app/pythagoras-calculator/id1270384222/reviews)** | [4.5 (17 ratings)](https://appshunter.io/ios/app/tri-go-math-your-math-helper/id1525513476/reviews) |
| Number of ratings | **248** | 17 |
| Positive reviews | **83.0% of reviews** | 66.7% of reviews |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 4 weeks** | Every 2 months |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 179 MB | 48 MB |
| Requires iOS | 15.0 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Glindemann, Sennoun, Langer GbR](https://appshunter.io/developer/1024972809) | [Alejandro Apodaca](https://appshunter.io/developer/1524127326) |

## 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


### Tri

[App page](https://appshunter.io/ios/app/tri-go-math-your-math-helper/id1525513476)

This app simplifies math homework with a suite of tools including area, basic, and trigonometry calculators. It offers offline access and equation solvers for first and second-degree equations, with more features planned.

**Highlights:** Offline Access, Area Calculator, Basic Calculator, Trigonometry Calculator, Unit Converter, Equation Solvers

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Quitar anuncios | $1.99 | one-time |


## Frequently asked questions

### Is Pythagoras Calculator free?

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

### Is Tri free?

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

### Which has better reviews, Pythagoras Calculator or Tri?

Pythagoras Calculator is rated higher. Pythagoras Calculator averages 4.6 out of 5 from 248 ratings, while Tri averages 4.5 from 17 ratings.

### Do Pythagoras Calculator or Tri have ads?

Tri shows ads; Pythagoras Calculator does not.

### Which is updated more often, Pythagoras Calculator or Tri?

Pythagoras Calculator ships an update every 4 weeks, and Tri every 2 months. Most recently, Pythagoras Calculator was updated on October 26, 2026 and Tri on October 24, 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.*