Comparison

Unit Converter Pro HD. vs Visual Math 4D

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Unit Converter Pro HD.

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
Read full description

The most powerful unit converter in the market. Helps you make easy conversion between more than 700+ various units of measure in 30 categories. Discover a universal assistant for all of your unit conversion needs. Features: √ 30 Categories √ 700+ Units of Measure √ Backspace key √ Extremely Easy-to-Use √ Supports Dark Mode Save Your Time. Quickly & Easily! Universer Unit Converter Pro HD URL scheme is "EWUnitConverterPro://"

About

Visual Math 4D

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
Read full description

Visual Math 4D is a graphical calculator that allows you to visualize and solve your mathematical equations. It supports various types of equations, such as polar, spherical, parametric and implicit equations, which can be visualized and animated in 2D and 3D. You can also plot and animate vector fields in 2D and 3D. Features: - solve equations - plot cartesian functions with intersections - plot polar- and spherical functions - plot parametric equations in 2D and 3D - plot complex functions (draw real part & imaginary part) - plot vector fields in 2D and 3D - plot implicit equations in 2D and 3D - plot contour maps ins 2D and 3D - support for complex numbers - vectors & matrices - truth- and value tables - trigonometrical and hyperbolic functions - piecewise-defined functions - logarithmic functions - logical & binary operators - definite integral - n-th derivations - statistical functions (nPr, nCr, rand..) - physical and mathematical constants with their units - animate variables - share content with other apps - no network connection required - and a lot more The app is easy to use and helps students and engineers to visualize and solve their mathematical equations.

Screenshots

Unit Converter Pro HD.3 screens
Visual Math 4D4 screens

Verdict

The call

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.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

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.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard6 real differences · 4 level
Unit Converter Pro HD. versus Visual Math 4D: the parameters behind the verdict, then further details
ParameterUnit Converter Pro HD.Visual Math 4D
Price$0.99 — better$1.99
Rating4.6 (187 ratings)4.6 (873 ratings)
Positive reviews86.7% of reviews — better76.1% of reviews
Number of ratings187873 — better
Update frequencyEvery 2 months — betterEvery 3 months
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS13.010.0 — better
Further details — not scored
Size13 MB112 MB
Age rating4+4+
Developer良峰 侯Ronny Weidemann

Customer experience

Unit Converter Pro HD.

All ratings187 ratings
Positive90.9%
Neutral3.2%
Negative5.9%
Written reviews331 reviews
Positive86.7%
Neutral4.2%
Negative9.1%

Visual Math 4D

All ratings873 ratings
Positive91.6%
Neutral4.2%
Negative4.1%
Written reviews92 reviews
Positive76.1%
Neutral6.5%
Negative17.4%

User reviews

Unit Converter Pro HD.

From 187 App Store ratings

What we love

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

Room to improve

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

Visual Math 4D

From 873 App Store ratings

What we love

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

Room to improve

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

Bugs and requests

Unit Converter Pro HD.

Reported bugs

2 issues
  • Incorrect fuel consumption conversions
  • Conversion values disappearing after update

Requested features

4 requests
  • 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

Reported bugs

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

Requested features

8 requests
  • Save button/menu to save equations
  • Complex function plotting
  • Slope field option for differential equations
  • Unit vector scaling for 2D vector fields
  • Undo button
Show 3 more
  • Ability to add custom functions
  • Ability to combine and scale multiple graphs
  • Instructions and documentation

In-app purchases

None

Unit Converter Pro HD.

No in-app purchases

3 purchases

Visual Math 4D

One-time3
  • Coffee$0.99
  • Cappuccino$1.99
  • Sandwich$4.99

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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