# Unit Converter Pro HD. vs Visual Math 4D

The clearest difference is in-app purchases: Unit Converter Pro HD. at none against Visual Math 4D's 3. Unit Converter Pro HD. also leads on review sentiment (87% vs 76%) and price ($0.99 vs $1.99). Visual Math 4D's advantage is ratings volume (873 vs 187) and iOS requirement (10.0 vs 13.0). On rating, update cadence, ads and device support there is nothing between them.

Unit Converter Pro HD. costs $0.99 and Visual Math 4D $1.99 up front. Visual Math 4D sells 3 one-off in-app purchases. Unit Converter Pro HD. asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 4.6 for Unit Converter Pro HD. against 4.6 for Visual Math 4D. Both are backed by a comparable volume of ratings — 187 and 873 respectively. Written reviews are what separate them: 87% of Unit Converter Pro HD.'s written reviews are positive against 76% of Visual Math 4D's.

Unit Converter Pro HD. ships an update every 2 months, Visual Math 4D every 3 months. The most recent releases landed on October 12, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | Unit Converter Pro HD. | Visual Math 4D |
| --- | --- | --- |
| Price | **$0.99** | $1.99 |
| Rating | [4.6 (187 ratings)](https://appshunter.io/ios/app/unit-converter-pro-hd/id458584668/reviews) | [4.6 (873 ratings)](https://appshunter.io/ios/app/visual-math-4d/id657441399/reviews) |
| Number of ratings | 187 | **873** |
| Positive reviews | **86.7% of reviews** | 76.1% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 3 months |
| Monetization | **Free** | Free with in-app purchases |
| Size | 13 MB | 112 MB |
| Requires iOS | 13.0 | **10.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [良峰 侯](https://appshunter.io/developer/654444245) | [Ronny Weidemann](https://appshunter.io/developer/657441402) |

## 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


### Visual Math 4D

[App page](https://appshunter.io/ios/app/visual-math-4d/id657441399)

Visualize and solve complex mathematical equations in 2D and 3D. Supports various equation types, vector fields, and animated variables. Ideal for students and engineers needing a powerful graphical calculator.

**Highlights:** Visualize 2D and 3D equations, Plot and animate vector fields, Support for polar, spherical, and parametric equations, Complex function plotting, Animate variables, Offline functionality

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Coffee | $0.99 | one-time |
| Cappuccino | $1.99 | one-time |
| Sandwich | $4.99 | one-time |

**What reviewers like**

- 🚀 Beautiful renderings
- 👍 Useful app
- 👍 Wonderful graphs and graphics
- 👍 Superior modeling tool
- 👍 Nice and easy to visualize

**What reviewers complain about**

- 🐛 App crashes and lost data
- 🐛 Unable to plot complex functions
- 🐛 Incorrect graph plotting
- 🐛 Scaling and range issues
- 🐛 Misleading app screenshots

**Reported bugs**

- App crashes on opening
- Incorrect graph plotting of planes
- Scaling issues with 2D vector fields
- Calculator not functioning

**Requested features**

- Save button/menu to save equations
- Complex function plotting
- Slope field option for differential equations
- Unit vector scaling for 2D vector fields
- Undo button


## Frequently asked questions

### Is Unit Converter Pro HD. free?

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

### Is Visual Math 4D free?

Visual Math 4D costs $1.99, and also offers in-app purchases.

### Which has better reviews, Unit Converter Pro HD. or Visual Math 4D?

Unit Converter Pro HD. and Visual Math 4D are both rated 4.6 out of 5 on the App Store, from 187 and 873 ratings respectively.

### Do Unit Converter Pro HD. or Visual Math 4D have ads?

Neither Unit Converter Pro HD. nor Visual Math 4D shows ads.

### Which is updated more often, Unit Converter Pro HD. or Visual Math 4D?

Unit Converter Pro HD. ships an update every 2 months, and Visual Math 4D every 3 months. Most recently, Unit Converter Pro HD. was updated on October 12, 2026 and Visual Math 4D on October 11, 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.*