The most common mistake when choosing a geometry app is picking the highest-rated math solver and assuming it's best for geometry too. Those star ratings cover every topic the app handles, and geometry is often a small part of that. The fix is to pick by the job. Do you need to scan a worksheet problem and see steps? Work out the area of an odd shape? Or build a figure and see why a theorem holds? Below are six apps that each do one of those jobs well. Every fact comes from their official App Store listings, so you can judge what each one really offers.
How we chose
We started with the geometry and math apps that show up most often for iPhone. Then we kept the ones whose official App Store listings clearly say they handle geometry, not just algebra or calculus. For each app we looked at four things:
- What it does for geometry: scanning problems, calculating from shapes, or building figures.
- How it explains: full steps, short steps, diagrams, or no explanation.
- What's free: what the listing says you get without paying.
- Who it suits: a quick homework check, a deeper learner, or someone who needs formulas on the go.
Ratings are from the US App Store as of October 2026. We didn't test these apps for accuracy ourselves, and no listing gives a geometry-only accuracy figure. So treat every answer as something to check, not something to copy. If you want a refresher on what good steps look like, our exterior angle theorem guide walks through a full worked example.
1. Photomath
Best for: scanning a problem and getting free basic steps.
Photomath is made by Google, and its listing lists geometry, trigonometry and angles among the topics it covers. You scan a printed, handwritten or on-screen problem and get a step-by-step explanation. Its listing says basic steps come at no charge, while Photomath Plus adds animated tutorials and textbook solutions.
- Strengths: free basic steps, multiple solution methods, and a huge rating base (4.8 from over 700,000 ratings).
- Weaknesses: geometry is one topic among many, and the deeper explanations sit behind Photomath Plus.
2. Geometry Solver ²
Best for: formulas and shape properties, even offline.
Geometry Solver ² is a shape calculator with an AI photo feature added. Its listing says it covers more than 115 shapes, from flat figures to 3D solids. You enter what you know and it works out the rest. A Live Preview shows how changing one measurement changes the whole shape. The listing also says calculations work without an internet connection, and it includes a formula library.
- Strengths: a wide shape library, offline calculations, and the live preview for seeing relationships.
- Weaknesses: a calculator-style approach suits "find the missing side" more than word-heavy problems. Its rating is 4.3 from about 1,300 ratings.
3. GeoGebra Geometry
Best for: building figures and understanding why a rule works.
GeoGebra Geometry isn't a photo solver at all. You construct points, lines, circles, polygons and angles yourself, then drag them around and measure lengths and areas. It also handles transformations (reflections, rotations and dilations), and you can step back through a construction to see how it was built. It's free.
Here's a quick example. Build any triangle, extend one side, and measure the exterior angle and the two interior angles opposite it. Now drag a vertex around. The exterior angle always equals the sum of those two angles, however you stretch the shape. Seeing that happen sticks better than reading the rule.
- Strengths: free, great for proofs and "does this always work?" questions, and it has built-in learning activities.
- Weaknesses: it won't read your worksheet, so you have to set up each problem by hand. Its rating is 4.0 from a small base of about 75 ratings.
4. Gauth
Best for: students who want a tutor-style explanation across many subjects.
Gauth is a general AI study app. Its listing names plane and solid geometry and transformations among its math topics. Beyond step-by-step answers, it offers an AI Live Tutor that talks through problems on a virtual whiteboard, and access to human subject experts.
- Strengths: conversational explanations, many subjects in one app, and a 4.8 rating from more than 1.5 million ratings.
- Weaknesses: it does a lot, so geometry is one small part of a big app. If you only need geometry, it may feel crowded.
5. Symbolab
Best for: students who also need trigonometry and algebra steps.
Symbolab says it bundles over 500 calculators, including a trigonometry calculator, and you can type or snap a problem. Its listing says basic steps are free and more advanced steps need a subscription.
- Strengths: strong on the algebra and trig inside many geometry problems (solving for x in an angle equation, using sine and cosine). It's rated 4.6 from about 26,000 ratings.
- Weaknesses: the listing doesn't name a geometry calculator, so diagram-heavy problems aren't its focus. Our Symbolab vs Mathway comparison goes into more detail on how it works.
6. Geometry Solver: Photo Solver
Best for: scanning geometry problems specifically, with diagram-based solutions.
This is our app, so weigh this entry with that in mind. Its listing describes a geometry-only scanner. It recognises triangles, circles, polygons and more complex shapes, solves for missing angles and measurements, and works out area, perimeter and volume. Solutions come with labelled diagrams, and it applies relevant theorems as it goes.
- Strengths: built only for geometry, visual step-by-step solutions, and support for 3D solids.
- Weaknesses: it's new on the US store and has no ratings there yet. It's iPhone only, and full use needs a subscription.
Which one is right for you?
Match the app to the job you actually have:
| Your situation | Good fit |
|---|---|
| "I want free steps for a scanned problem" | Photomath |
| "I need the area or a missing side of an unusual shape, maybe offline" | Geometry Solver ² |
| "I don't understand why the theorem works" | GeoGebra Geometry |
| "I want it explained like a tutor would" | Gauth |
| "My geometry problem is really a trig or algebra equation" | Symbolab |
| "I want a scanner that only does geometry and draws the diagram" | Geometry Solver: Photo Solver |
A few habits make any of these more useful:
- Try it first. Spend five minutes on the problem before scanning. Then the app's steps show you exactly where you went wrong.
- Check what the app read. Compare its version of the problem with yours: angle marks, parallel arrows, given lengths. One misread label changes the answer.
- Don't trust the picture's proportions. Worksheet diagrams often aren't drawn to scale, and an answer should come from the givens, not from how the drawing looks.
- Redo it without the app. If you can't solve a similar problem on your own the next day, you haven't learned it yet.
- Follow your teacher's rules. Checking your work is one thing. Handing in answers you didn't work out is another.
Here's why step 2 matters. Say a triangle has angles of 47° and 68°, and you need the third. The answer is 180 − 47 − 68 = 65°. If a scanner misreads the faint "47" as "41", it will confidently show 180 − 41 − 68 = 71°, with tidy steps that are all correct for the wrong problem. The steps won't warn you. Only comparing the givens with your worksheet will.
For more general math apps, see our list of the best math solver apps for iPhone.
How Photo Solver can help
If most of your homework comes as diagrams, a geometry-only scanner keeps things simple. Point your iPhone camera at the problem and the app recognises the shapes, then shows a step-by-step solution with a labelled diagram. It covers missing angles, area, perimeter, volume and 3D solids, and it names the theorem it applies, so you can see why each step follows. Use it to check your own work after you've tried the problem, not before. Learn more on the app page or browse more geometry guides.
Frequently asked questions
What is the best free geometry solver app?
For building figures, GeoGebra Geometry is free and lets you construct shapes, drag points and measure lengths and areas. For scanning problems, Photomath's listing says basic step-by-step explanations come at no charge. Most other solvers are free to download but keep fuller explanations behind a subscription.
Can a geometry app solve a problem from a photo of a diagram?
Several apps say they can, including Photomath, Gauth and dedicated geometry scanners. Always check what the app read before trusting the answer. A misread angle mark, a missing label or a diagram that isn't drawn to scale can lead to a confident but wrong result.
Is it cheating to use a geometry solver app?
It depends on how you use it and on your school's rules. Using an app to check your own work or to see the steps you missed is usually fine. Copying answers into graded work you're meant to do alone is not. If you're unsure, ask your teacher what's allowed.
Which geometry app is best for proofs?
Proofs are the hardest thing for any solver, because there's rarely one fixed answer to scan. GeoGebra Geometry helps you test whether a claim holds by dragging points and watching measurements change. Some AI solvers list proofs or theorem steps, but read every line and make sure each reason is valid.
Do geometry solver apps work offline?
Most photo solvers need an internet connection to process a scan. Geometry Solver ² is an exception for calculations: its listing says it can compute properties for more than 115 shapes without a connection. Check each app's listing if you'll study somewhere with poor signal.
Conclusion
The best geometry solver app is the one that fits your task. Photomath gives free steps for scanned problems. Geometry Solver ² handles shape formulas and works offline. GeoGebra Geometry is the free choice for understanding figures and proofs. Gauth suits learners who want a tutor-like explanation, and Symbolab is strong on the trig and algebra inside geometry. Whichever you choose, try each problem first, check what the app read, and make sure you could solve it again on your own.