# Tri vs Slope Calculator

The clearest difference is rating: Tri at 5.0 against Slope Calculator's 4.3. Tri also leads on review sentiment (100% vs 58%) and in-app purchases (none vs 1). Slope Calculator's advantage is ads (none vs shown) and ratings volume (104 vs 1). On price, update cadence and device support there is nothing between them.

Both are free to download. Slope Calculator sells 1 one-off in-app purchase. Tri asks for nothing beyond the download.

Tri holds the better App Store score, 5.0 against 4.3. That said, the two scores are not equally well evidenced: Slope Calculator has 104 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 100% of Tri's written reviews are positive against 58% of Slope Calculator's.

Tri ships an update every 12 months, Slope Calculator every 14 months. Both last shipped on September 16, 2026.

## The numbers

| Metric | Tri | Slope Calculator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/tri-func/id496807268/reviews)** | [4.3 (104 ratings)](https://appshunter.io/ios/app/slope-calculator-calc/id1561129699/reviews) |
| Number of ratings | 1 | **104** |
| Positive reviews | **100.0% of reviews** | 58.3% of reviews |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | **Every 12 months** | Every 14 months |
| Monetization | **Ad-supported** | Free with in-app purchases |
| Size | 4 MB | 5 MB |
| Requires iOS | 15.6 | **13.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Thirdware.jp](https://appshunter.io/developer/464228680) | [Phan Nhat Đang](https://appshunter.io/developer/1437390098) |

## 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


### Slope Calculator

[App page](https://appshunter.io/ios/app/slope-calculator-calc/id1561129699)

Calculate slope in angle, percentage, or ratio by inputting two sides of a right triangle. This intuitive and easy-to-use application provides the remaining necessary values.

**Highlights:** Calculate slope as angle, Calculate slope as percentage, Calculate slope as ratio, Input two sides of a right triangle, Calculate remaining triangle values, Intuitive and easy to use

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove ads | $1.99 | one-time |


## Frequently asked questions

### Is Tri free?

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

### Is Slope Calculator free?

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

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

Tri is rated higher. Tri averages 5.0 out of 5 from 1 ratings, while Slope Calculator averages 4.3 from 104 ratings.

### Do Tri or Slope Calculator have ads?

Tri shows ads; Slope Calculator does not.

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

Tri ships an update every 12 months, and Slope Calculator every 14 months. Most recently, Tri was updated on September 16, 2026 and Slope Calculator on September 16, 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.*