# Tri vs Trigonometry Master

The clearest difference is review sentiment: Tri at 100% against Trigonometry Master's 50%. Tri also leads on price (Free vs $12.99) and rating (5.0 vs 2.5). Trigonometry Master's advantage is ads (none vs shown) and device support (4 vs 2). On ratings volume, update cadence and in-app purchases there is nothing between them.

Tri is free to download; Trigonometry Master costs $12.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Tri holds the better App Store score, 5.0 against 2.5. Both are backed by a comparable volume of ratings — 1 and 2 respectively. Written reviews point the same way: 100% of Tri's written reviews are positive against 50% of Trigonometry Master's.

Tri ships an update every 12 months, Trigonometry Master every 10 months. The most recent releases landed on September 16, 2026 and September 10, 2026 respectively.

## The numbers

| Metric | Tri | Trigonometry Master |
| --- | --- | --- |
| Price | **Free** | $12.99 |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/tri-func/id496807268/reviews)** | [2.5 (2 ratings)](https://appshunter.io/ios/app/trigonometry-master/id1389001905/reviews) |
| Number of ratings | 1 | **2** |
| Positive reviews | **100.0% of reviews** | 50.0% of reviews |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Every 12 months | **Every 10 months** |
| Monetization | **Ad-supported** | Paid |
| Size | 4 MB | 12 MB |
| Requires iOS | 15.6 | **11.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Thirdware.jp](https://appshunter.io/developer/464228680) | [Intemodino Group s.r.o.](https://appshunter.io/developer/557849644) |

## What reviewers say

### Tri

[App page](https://appshunter.io/ios/app/tri-func/id496807268)

This utility app provides the formula and value for calculating triangle properties. It's designed for quick access to mathematical formulas related to triangles.

**Highlights:** Triangle formula display, Value calculation, Quick access utility, Mathematical formulas

**Features:** Vision Pro support

**In-app purchases:** none


### Trigonometry Master

[App page](https://appshunter.io/ios/app/trigonometry-master/id1389001905)

Easily calculate unknown sides, angles, area, and perimeter of any triangle. Supports both right and oblique triangles with visual input modes and adjustable decimal places for accuracy. Includes a history tape and email sharing for recent calculations.

**Highlights:** Solves right and oblique triangles, Calculates sides, angles, area, perimeter, Draws calculated triangles, Supports degrees and radians, Visual input modes, Adjustable decimal places, History tape and email results

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Tri free?

Tri is free to download, with no in-app purchases.

### Is Trigonometry Master free?

Trigonometry Master costs $12.99, with no in-app purchases.

### Which has better reviews, Tri or Trigonometry Master?

Tri is rated higher. Tri averages 5.0 out of 5 from 1 ratings, while Trigonometry Master averages 2.5 from 2 ratings.

### Do Tri or Trigonometry Master have ads?

Tri shows ads; Trigonometry Master does not.

### Which is updated more often, Tri or Trigonometry Master?

Tri ships an update every 12 months, and Trigonometry Master every 10 months. Most recently, Tri was updated on September 16, 2026 and Trigonometry Master on September 10, 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.*