Geometry solver ² lite – homework math calculator - Interview with the developer of a fantastic app

Did you have any prior development or coding experience?

Yes, I have. I've been developing apps for various platforms since 2005. I jumped to an Android bandwagon as soon as it has reached version 0.9 - so pretty soon, in 2009. I already had a few years of experience with Java SE and J2EE, so the transition was smooth. Over time I've also developed mobile apps for Windows mobile and iOS. Also, I've almost 8 years of experience in ABAP, which is a programming language used on SAP systems.

What was the most challenging aspect of developing mobile app?

I've chosen the geometry field because the formulas are already discovered, so one would think it's the least challenging thing to program, right? Wrong :) If you want to do the geometry app in such a manner it would be more than a simple calculator, you have to determine the conditions under which the formulas work. For instance, in a triangle, the sum of two sides cannot be smaller than the third one, because it wouldn't form a triangle.

Rudo is an always-doing-something type of developer, communicative and friendly towards others, and a team player who doesn't like to play solo. He is currently working on Android and iOS apps and raising a son with my lovely wife. In the past, he has worked as an ABAP developer for the SAP IS-U module (~8 years), but also had his share of fun with J2EE, databases, PHP, and so on. He also participated in or has created few apps for Windows Phone 8.

Name a few of your favorite apps and reason you love them.

Well, even though I'm a mobile developer, I don't really use mobile apps that much. I'm spending most of my time in Gmail, Twitter, and Slack. Those are my "communication" apps, they keep me up to date with the world :) I spend quite a large chunks of my time in Revolut investing and staring at the stock charts... Otherwise, to be productive I need my PC and to entertain myself I have my consoles.

How long have you been working on this app?

The first version of this app was released on 4th of February 2011. Yes, 10 years ago. Of course it didn't looked anything like it's looking today. Last major version was first released last May on iOS and I've been pushing updates with new geometric shapes almost every two weeks. I've re-released this version of Geometry solver (3.0.0) for Android on 20th of February 2021 after two months of quite an intensive development.

What need of the user did you have in mind when developing this app?

As I said before, each geometry formula is something that is discovered already. And to create a math/geometry app you don't need a sophisticated backend nor any difficult programming techniques. So for me, it was something that I could program quickly and efficiently. Also, I have a few friends and they were struggling with checking the geometry homework of their kids, so it was an easy decision for me to help them and at the same time get a new app entry in my portfolio.

In what way do you think your app is better than similar apps on the market? Please describe in detail what innovation you think you bring and what you are proud of in your app.

Clean UI and color-coded schematics make it easy to imagine which variable goes where. Also, it's made with tablets in mind and therefore it's very well suited to be used in the schools. Moreover, it was certified by the teachers on, which is a platform used for app reviews by professionally experienced teachers. I don't think any of my competitors have that.

What are your future plans and expected features of the coming new versions of this app?

You wouldn't believe how many geometric shapes are still there. I get emails from civil engineers, parents, teachers, and students alike and everybody sends their tips for the next shape "I simply have to add in the app". But some of them are quite a lot of work. My latest addition "Incircle and circumcircle of a triangle" has 3226 lines of code. One day I'd like to add a new feature, that would explain to the user how the app did calculate the results step by step.

Assuming new users of your app are reading this page. What do you want to ask them to do (contact you about X, Share the app, etc.)?

Download the app for free and let me know what you think, what can I do better. If you share the app's link with a short sentence why you like the app on your social media and send me the link as a proof, you'll get a promo code for full paid version of the app (the number of codes are limited to 200 ;))

Geometry solver ² lite – homework math calculator

About App:

Simple and easy-to-use homework geometry solver that proofs your solutions!

Solve the perimeter, area, surface, or volume of various geometric shapes with this geometry calculator.

Perimeter and surface calculator for 2D shapes:
- square
- rectangle
- circle
- ellipse
- triangle
- trapezoid
- parallelogram
- trigonometry
- equilateral triangle
- isosceles triangle
- right triangle
- circular segment
- circular sector
- annular sector
- elliptical segment
- annulus
- Quadratic function
- Cubic function.

Area and volume calculator for 3D shapes:
- cone
- truncated cone
- pyramid
- sphere
- cube
- cylinder
- torus
- right triangular prism
- rectangular prism
- truncated pyramid
- barrel
- asymmetric barrel
- trapezoidal prism
- parallelogram prism
- wedge
- elliptic cone
- Tetrahedron
- Octahedron
- Dodecahedron
- Icosahedron
- oblique cylinder
- oblique prism
- oblique cone
- oblique truncated cone
- truncated elliptical cone
- triangular prism
- frustum
- right prism
- Spherical sector
- Spherical cap
- Spherical segment
- Spherical wedge
- ellipsoid
- toroid.

Categories: Tools

Date: March 9, 2021

Developer: Rudo Halmi

About developer: Rudo is an always-doing-something type of developer, communicative and frien ... Read more



App URL in iTunes
App URL in Google Play


The “Protect Amoled” application is lightweight and straightforward. The majority of ...
OpenSky – Drone Flyer App

OpenSky – Drone Flyer App

October 4, 2023

OpenSky is a convenient and quick solution for drone pilots to view the rules and ...
Essential Backup

Essential Backup

September 12, 2023

Backup your Android phone! Backup your important data with Essential Backup. Backup ...
Sup Dropshipping

Sup Dropshipping

September 1, 2023

1. Regular updates of latest hot selling products
On Sup’s mall, you w ...


Every day we publish one great app and help 750,000 users discover new apps to add to their mobile device. Click here to add your app and let users discover it for free.

Social Links