Pythagoras Calculator vs Tri
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Pythagoras Calculator
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.
- Pythagorean theorem calculations
- Calculate any of the three sides
- History of calculations
- Supports fraction input
- Shareable solutions
- Ad-free option
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Finish your homework instantly. Prepare for exams without stress. Free, complete step-by-step solutions. Enter two sides and calculate the third using the Pythagorean theorem. HOW IT WORKS Enter your values in the correct fields and get started. You’ll receive the solution instantly and can share it with friends or classmates. YOUR PERSONAL DATA We don’t need it. Only anonymized data is collected, for example: - which features are used - how many solutions are generated This helps us improve. We cannot draw any conclusions about you. COSTS Everything is free to use. 24/7 access to your solutions. All solution steps are always fully available. If you need many solutions in a short time, various purchase options are available. EXTRAS - curated learning videos - feedback on incorrect inputs - manage your own solutions - app introduction CONTACT Questions and feedback via Discord or directly in the app review.
Tri
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.
- Offline Access
- Area Calculator
- Basic Calculator
- Trigonometry Calculator
- Unit Converter
- Equation Solvers
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Easily complete your homework with this app! Key Features: Offline Access: Use the app anytime, anywhere. Area Calculator: Quickly compute the area of shapes. Basic Calculator: Simplify everyday calculations. Trigonometry Calculator: Solve the Pythagorean theorem. Calculate trigonometric functions. Unit Converter: Convert between units with ease. Equation Solvers: Solve first-degree equations! Solve second-degree equations! And More Features Coming Soon!
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Pythagoras Calculator | Tri |
|---|---|---|
| Price | Free | Free |
| Rating | 4.6 (248 ratings) — better | 4.5 (17 ratings) |
| Positive reviews | 83.0% of reviews — better | 66.7% of reviews |
| Number of ratings | 248 — better | 17 |
| Update frequency | Every 4 weeks — better | Every 2 months |
| Ads | No — better | Yes |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.0 | 12.0 — better |
| Further details — not scored | ||
| Size | 179 MB | 48 MB |
| Age rating | 4+ | 4+ |
| Developer | Glindemann, Sennoun, Langer GbR | Alejandro Apodaca |
Customer experience
Pythagoras Calculator
Tri
Bugs and requests
Pythagoras Calculator
Reported bugs
6 issues- 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
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- Persistent ads despite payment for removal
Requested features
6 requests- Calculate triangle angles
- Support angle-based calculations with one side
- Better monetization without aggressive ads
- Improved ratings system
- Real-time results display
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- Support for non-right triangles
Tri
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Pythagoras Calculator
- +30 User Tokens$0.29
- +1 Convenience Token / 6h, max. +2$0.59
- +2 Convenience Tokens / 6h, max. +4$0.99
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- +150 User Tokens$0.99
- +300 User Tokens$1.49
- +4 Convenience Tokens / 6h, max. +8$1.59
- Remove Ads$1.99
- Lifetime Access$1.99
Tri
- Quitar anuncios$1.99
Questions
Is Pythagoras Calculator free?
Is Tri free?
Which has better reviews, Pythagoras Calculator or Tri?
Do Pythagoras Calculator or Tri have ads?
Which is updated more often, Pythagoras Calculator or Tri?
Other comparisons
