# Unit Converter Pro HD. vs Arbitrary Triangle PRO

The clearest difference is rating: Arbitrary Triangle PRO at 5.0 against Unit Converter Pro HD.'s 4.6. Arbitrary Triangle PRO also leads on update cadence (every 3 weeks vs every 2 months). Unit Converter Pro HD.'s advantage is ratings volume (185 vs 1) and price ($0.99 vs $2.99). On ads, in-app purchases and device support there is nothing between them.

Unit Converter Pro HD. costs $0.99 and Arbitrary Triangle PRO $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Arbitrary Triangle PRO holds the better App Store score, 5.0 against 4.6. That said, the two scores are not equally well evidenced: Unit Converter Pro HD. has 185 ratings behind it against 1, so its average is the more settled of the two.

Unit Converter Pro HD. ships an update every 2 months, Arbitrary Triangle PRO every 3 weeks. The most recent releases landed on September 23, 2026 and September 17, 2026 respectively.

## The numbers

| Metric | Unit Converter Pro HD. | Arbitrary Triangle PRO |
| --- | --- | --- |
| Price | **$0.99** | $2.99 |
| Rating | [4.6 (185 ratings)](https://appshunter.io/ios/app/unit-converter-pro-hd/id458584668/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/arbitrary-triangle-pro/id1617819308/reviews)** |
| Number of ratings | **185** | 1 |
| Positive reviews | 86.7% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 3 weeks** |
| Monetization | **Free** | Paid |
| Size | 13 MB | 182 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [良峰 侯](https://appshunter.io/developer/654444245) | [Glindemann, Sennoun, Langer GbR](https://appshunter.io/developer/1024972809) |

## What reviewers say

### Unit Converter Pro HD.

[App page](https://appshunter.io/ios/app/unit-converter-pro-hd/id458584668)

Easily convert between over 700 units of measure across 30 categories. This powerful tool acts as a universal assistant for all your conversion needs, saving you time and effort.

**Highlights:** 30 conversion categories, Over 700 units of measure, Backspace key for corrections, Intuitive and easy to use, Supports Dark Mode

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

**In-app purchases:** none

**What reviewers like**

- 🚀 Fast and efficient
- 👍 Easy to use
- 👍 Comprehensive unit conversions
- 👍 Accurate calculations
- 👍 Handy and useful

**What reviewers complain about**

- 🐛 Missing some important units
- 🔍 Difficult to navigate and find desired units
- 🔍 Cluttered interface with too many options
- 🔋 High battery consumption

**Reported bugs**

- Incorrect fuel consumption conversions
- Conversion values disappearing after update

**Requested features**

- Add support for more units (e.g. knots, stone, electron volts)
- Improve navigation and make it easier to find desired units
- Add portrait mode support
- Optimize interface for better usability


### 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


## Frequently asked questions

### Is Unit Converter Pro HD. free?

Unit Converter Pro HD. costs $0.99, with no in-app purchases.

### Is Arbitrary Triangle PRO free?

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

### Which has better reviews, Unit Converter Pro HD. or Arbitrary Triangle PRO?

Arbitrary Triangle PRO is rated higher. Unit Converter Pro HD. averages 4.6 out of 5 from 185 ratings, while Arbitrary Triangle PRO averages 5.0 from 1 ratings.

### Do Unit Converter Pro HD. or Arbitrary Triangle PRO have ads?

Neither Unit Converter Pro HD. nor Arbitrary Triangle PRO shows ads.

### Which is updated more often, Unit Converter Pro HD. or Arbitrary Triangle PRO?

Unit Converter Pro HD. ships an update every 2 months, and Arbitrary Triangle PRO every 3 weeks. Most recently, Unit Converter Pro HD. was updated on September 23, 2026 and Arbitrary Triangle PRO on September 17, 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.*