# Arbitrary Triangle PRO vs Yomi

The clearest difference is price: Yomi at Free against Arbitrary Triangle PRO's $2.99. Arbitrary Triangle PRO's advantage is in-app purchases (none vs 4) and update cadence (every 3 weeks vs every 3 months). On ads, device support and iOS requirement there is nothing between them.

Yomi is free to download; Arbitrary Triangle PRO costs $2.99 up front. Yomi sells 4 in-app purchases, starting at $4.99 per 7 days. Arbitrary Triangle PRO asks for nothing beyond the download.

Arbitrary Triangle PRO ships an update every 3 weeks, Yomi every 3 months. The most recent releases landed on November 7, 2026 and November 8, 2026 respectively.

## The numbers

| Metric | Arbitrary Triangle PRO | Yomi |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/arbitrary-triangle-pro/id1617819308/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 3 months |
| Monetization | Paid | — |
| Size | 182 MB | 271 MB |
| Requires iOS | **15.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Glindemann, Sennoun, Langer GbR](https://appshunter.io/developer/1024972809) | [Elina Patjas](https://appshunter.io/developer/1784693168) |

## What reviewers say

### Arbitrary Triangle PRO

[App page](https://appshunter.io/ios/app/arbitrary-triangle-pro/id1617819308)

This app calculates all unknown quantities of an arbitrary triangle. It displays the formulas used and provides step-by-step solutions, supporting decimals and fractions. Calculations are saved in history and can be shared.

**Highlights:** Calculates all triangle quantities, Displays formulas used, Step-by-step solutions, Supports decimals and fractions, Calculation history, Shareable solutions

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

**In-app purchases:** none


### Yomi

[App page](https://appshunter.io/ios/app/yomi-read-aloud-for-kids/id6739611621)

**Features:** macOS Compatibility

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Yomi Pro Weekly | $4.99 | per 7 days |
| Yomi Pro Monthly | $9.99 | per month |
| Yomi Pro Annual | $49.99 | per year |
| Lifetime | $25.00 | one-time |


## Frequently asked questions

### Is Arbitrary Triangle PRO free?

Arbitrary Triangle PRO costs $2.99, with no in-app purchases.

### Is Yomi free?

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

### Do Arbitrary Triangle PRO or Yomi have ads?

Neither Arbitrary Triangle PRO nor Yomi shows ads.

### Which is updated more often, Arbitrary Triangle PRO or Yomi?

Arbitrary Triangle PRO ships an update every 3 weeks, and Yomi every 3 months. Most recently, Arbitrary Triangle PRO was updated on November 7, 2026 and Yomi on November 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.*