GeoGebra is the better choice for most geometry work. It has a dedicated Geometry app, a 3D Calculator and a CAS, and the installed apps keep working offline. Desmos Geometry is the better choice when you want a clean, simple canvas for constructions and transformations in a browser, with less to learn. That matters because geometry homework and geometry teaching ask for different things: a student checking a proof needs depth, while a teacher drawing a quick reflection on the board needs speed. Here's how the two compare, feature by feature.
Quick verdict
- Choose GeoGebra if you need proofs, 3D solids, algebra alongside your shapes, or a tool that works offline.
- Choose Desmos if you want a tidy, beginner-friendly canvas for constructions and transformations, and you already use the Desmos graphing calculator.
- Use both if your class uses Desmos for graphing but your geometry unit gets into 3D or algebraic proof.
Side-by-side comparison
| Feature | GeoGebra | Desmos |
|---|---|---|
| Dedicated geometry tool | Yes, the Geometry app | Yes, Desmos Geometry |
| Constructions (points, lines, circles, angles, polygons) | Yes | Yes |
| Transformations (translate, reflect, rotate, dilate) | Yes | Yes, via the Transform and Construct menu |
| 3D geometry | Yes, 3D Calculator app | Separate 3D calculator, not part of Desmos Geometry |
| Algebra system (CAS) | Yes, CAS app | No CAS in Desmos Geometry |
| Offline use | Yes, once apps are installed | Browser-based |
| iPhone | iOS apps available | Graphing Calculator app; Geometry runs in the browser |
| Price | Free for non-commercial use | Free |
Based on GeoGebra's download page, the Desmos Geometry getting-started guide and the Desmos transformations guide, as of October 2026. We couldn't find a separate Desmos Geometry app on the App Store at the time of writing.
Where GeoGebra is better
It's a full geometry toolkit, not just a canvas
GeoGebra splits its tools into separate apps. According to its download page, there's a Geometry app for circles, angles and transformations, a 3D Calculator for surfaces and 3D geometry, a CAS for solving equations and finding derivatives, plus Graphing and Scientific apps. The Calculator Suite combines them in one place.
That range matters once geometry stops being just triangles. Volume of a cone, the angle between two planes, or proving that a point lies on a circle using coordinates all need more than a 2D drawing.
3D geometry lives in the same family
Surface area and volume problems are much easier to picture when you can rotate the solid. GeoGebra's 3D Calculator handles 3D geometry directly, so you can build a prism and check its faces instead of trusting a flat sketch.
It works offline
GeoGebra says its installed apps keep the main math tools working without internet, and you can save work locally. You only need a connection to sign in, open online resources or share your work. For homework on a bus or in a library with unreliable Wi-Fi, that's a real advantage.
Stronger for proofs and exploration
Because constructions in GeoGebra stay linked, you can drag a vertex and watch which relationships hold. Build a triangle, add an exterior angle, then drag the vertices: the exterior angle theorem holds every time, which is a far more convincing check than one measured drawing.
The trade-off: more tools means more menus. New users often take longer to find the right command, and the interface can feel busy on a small screen.
Where Desmos is better
It's easier to start
Desmos Geometry keeps everything in one toolbar. Its getting-started guide shows you constructing points, lines, circles, angles and polygons from the same place. If you've used the Desmos graphing calculator in algebra class, the look and feel will already be familiar.
Transformations are clear and reusable
The Desmos transformations guide walks through translating, reflecting, rotating and dilating shapes from the Transform and Construct menu. You choose a vector, a line of reflection, a centre or a scale factor, and Desmos keeps a Recent Transformations list so you can reuse one or combine several into a composite transformation.
For a typical worked example, such as reflecting triangle ABC across the line y = x and then rotating it 90° about the origin, that composite feature lets you see both steps and the final image without redrawing anything.
Clean diagrams for class
Desmos diagrams look tidy by default, which is why many teachers like it for slides and worksheets. If your goal is a clear picture rather than a deep investigation, it gets you there with fewer clicks.
The trade-off: Desmos Geometry is focused on 2D. There's no CAS inside it, 3D work happens in a separate calculator, and it runs in the browser rather than as a dedicated iPhone app.
Which should you choose?
Match the tool to the task in front of you:
| Your situation | Better pick |
|---|---|
| Learning basic constructions and transformations | Desmos |
| Proving theorems by dragging and checking | GeoGebra |
| Surface area, volume or 3D solids | GeoGebra |
| Making a clean diagram for a worksheet | Desmos |
| Doing homework without reliable internet | GeoGebra |
| Your teacher already uses Desmos in class | Desmos |
If you're a student, the most practical answer is often "whatever your teacher uses," because assignments and shared activities are built around one tool. Both are free for students, so there's no cost to trying each on the same problem and seeing which one makes the idea click.
One caution: neither tool replaces understanding why a step works. Dragging a diagram shows you that angles add up, but your exam will still ask you to justify it. Use the tool to check your reasoning, not to skip it. If you want to see how other geometry apps compare, our roundup of the best geometry solver apps covers solvers as well as construction tools.
Try both on one problem: a 5-step test
The fastest way to decide is to run the same construction in each tool. Use this problem: draw a circle, inscribe a triangle with one side as the diameter, and check the angle opposite that side. By Thales' theorem it should always be 90°.
1. Draw the circle
Place a centre point and a point on the circle. In both tools this takes two clicks. Notice which toolbar you found the circle tool in faster.
2. Add the diameter
Draw a line through the centre so that it crosses the circle in two places, and mark both intersection points. These become two vertices of your triangle. GeoGebra and Desmos both create intersection points for you, but check how easy it is to select the right ones.
3. Pick a third point on the circle
Put a point anywhere else on the circle and join it to the two ends of the diameter. You now have an inscribed triangle.
4. Measure the angle
Use the angle tool on the vertex sitting on the circle. It should read 90°. If it reads 89.9° or 90.1°, your third point isn't attached to the circle, which is a useful lesson in how each tool links objects.
5. Drag and watch
Drag the third point around the circle. If the angle stays at 90° wherever the point goes, the construction is linked correctly. This is where you'll feel the difference: GeoGebra gives you more measurement and algebra options around the drawing, while Desmos keeps the screen calmer and easier to read.
Whichever tool made those five steps feel natural is the one to use for your course. If one kept getting in your way, you have your answer.
How Photo Solver can help
GeoGebra and Desmos are great for building shapes, but they expect you to set up the problem yourself. Photo Solver works from the other end: you photograph a geometry problem from your textbook or worksheet and it recognises triangles, circles and polygons, applies the relevant theorems, and shows a step-by-step solution with a labelled diagram. It covers missing angles, area, perimeter, volume and surface area. Use it to check your working after you've tried a problem, then rebuild the diagram in GeoGebra or Desmos to see why the answer holds. It's on iPhone only. See the app page or more guides on the geometry blog.
Frequently asked questions
Is GeoGebra or Desmos better for geometry?
GeoGebra is usually better for geometry because it has a dedicated Geometry app, a 3D Calculator and a CAS for algebra steps. Desmos Geometry covers constructions and transformations with a cleaner interface, so it can be easier for beginners or quick class diagrams.
Is GeoGebra free?
Yes, for non-commercial use. GeoGebra says its apps are free for teachers and students at school, university or home, and no account is needed for basic use. Commercial use needs a separate licence.
Can Desmos do geometry constructions?
Yes. Desmos Geometry has a toolbar for points, lines, circles, angles and polygons, and a Transform and Construct menu for translating, reflecting, rotating and dilating shapes. You can also reuse transformations and combine them.
Does GeoGebra work offline?
Installed GeoGebra apps work without internet for the main math tools, and you can save work locally. You still need a connection to sign in, open online resources, or save and share work online.
Which one should I use on my iPhone?
GeoGebra offers iOS apps, including its Calculator Suite with geometry and 3D tools. Desmos's App Store app is its Graphing Calculator; Desmos Geometry itself runs in the browser, which works on an iPhone but feels more cramped than a laptop.
Conclusion
GeoGebra wins for depth: a dedicated Geometry app, 3D and CAS tools, and offline use make it the better pick for proofs, solids and serious homework. Desmos wins for simplicity: its Geometry tool makes constructions and transformations quick and tidy, especially if you already know Desmos from algebra. Both are free for students, so try the same problem in each and keep whichever helps you understand the geometry, not just draw it.