Scanner app for homework · Available now on Android

Scan the problem. Preview first. See every step.

Use your Android camera (with flash for dim desks) or photo library to scan printed worksheets and handwritten STEM homework. Nothing is sent or charged until you confirm the crop, and every solution comes back with numbered steps, textbook-typeset math, and an arithmetic check.

iPhone, iPad, and Mac: coming soon to the App Store.

10 free scan credits to start. No sign-in needed.

Scanned Algebra Problem

Solve the quadratic equation: x² − 5x + 6 = 0

Step by step.

Factor the quadratic expression (x − 2)(x − 3) = 0 Find two numbers that multiply to +6 and add to −5: those numbers are −2 and −3.
Apply the zero-product property x − 2 = 0 or x − 3 = 0 Set each linear factor equal to zero and solve for x.
Substitute both roots to check (2)² − 5(2) + 6 = 0 Both x = 2 and x = 3 satisfy the original equation.

Solution

x = 2, x = 3

Arithmetic checks passed

Why students switch to Stemulus

A homework scanner built for STEM, not just a camera.

Many photo solver apps waste your free scans on blurry captures or lock intermediate steps behind a recurring subscription. Stemulus gives you control before and after you scan.

Preview before you spend a credit

Take a photo with flash or choose a screenshot from your Android gallery. You see the captured problem in a preview first. Capturing an image alone never uses a scan credit until you tap Check Problem.

Numbered steps with the reason for each move

Instead of dropping a bare final number, Stemulus numbers every step in order, renders the math the way it appears in a textbook, and explains why that step works.

Automated arithmetic verification

Where the calculation supports it, Stemulus substitutes the final result back into the original equation to verify accuracy, and tells you honestly to review it when a check cannot confirm the answer.

Copy clean LaTeX or save your own attempt

Enter the answer you got before checking so your attempt is saved alongside the worked solution. Copy any equation as LaTeX for lab reports or digital notes in one tap.

What you can scan

One camera scanner across your STEM courses.

Each scanned problem is automatically labeled with its subject and saved to your device so you can organize problems by assignment.

Mathematics

Algebra, Geometry & Calculus

Scan linear and quadratic equations, inequalities, systems of equations, geometry problems, trigonometric identities, derivatives, limits, and integrals.

Physics

Mechanics, Kinematics & Circuits

Capture multi-sentence physics word problems and numericals covering motion, forces, work and energy, momentum, and electricity.

Chemistry

Stoichiometry, Reactions & Equilibrium

Photograph chemical equations, molar mass and limiting-reactant problems, gas laws, acid-base pH calculations, and organic chemistry questions.

After you scan

Turn scanned worksheets into study guides and practice tests.

01 · Assignments

Organize scanned problems by homework set

Group scanned problems into named assignments and mark each one Got it, Review later, or Still stuck as you work through tonight's homework.
02 · Study guide

Build a study guide from your own scans

Generate a custom study guide for any assignment covering key concepts, formulas and when to apply them, worked examples linked back to your scanned problems, and targeted review suggestions.
03 · Practice

Practice three new questions with progressive hints

Start a practice round drawn from your assignment, prioritizing problems you marked Still stuck or Review later. Reveal hints one at a time and check your attempt before viewing the worked answer.
04 · Offline

Reopen saved scans and practice sets offline for free

Reopening saved solutions, study guides, and practice sets never uses a credit and works offline on your Android phone or tablet.

How to get the cleanest homework scan on Android

When scanning printed worksheets, textbook pages, or handwritten math and science problems on Android, a clean crop makes all the difference:

Crop to a single problem: If a worksheet has ten equations on the page, frame or crop just the one problem you want to check so the solver focuses on that specific question.
Use the built-in flash on dim desks: Shadows from your phone or lamp can obscure exponents, minus signs, and subscripts. Stemulus includes a camera flash toggle right in the capture view.
Log your own attempt before checking: If you already worked the problem on paper and got stuck on step three, enter your answer before tapping Check Problem. Stemulus keeps your attempt next to the worked solution and never marks a problem as “correct” just because you viewed the answer.
Explore subject-specific solvers: Need help with a specific course? See how Stemulus handles Geometry Problems & Proofs, Physics Numericals & Word Problems, Chemistry Equations & Stoichiometry, and Algebra & Calculus Word Problems, or read our comparison of Gauth, Photomath, and Mathway alternatives.

Pricing

Start free, then pay the way you study.

No sign-in is needed to check problems or subscribe. Every new account starts with 10 free scan credits. Link an Apple or Google account when you want to use your access on other platforms.

Subscription

Stemulus Pro

$4.99 per week

100 problem checks or study generations per rolling seven days
Each check becomes available again seven days after you use it
A failed generation returns its allowance
Renews weekly until canceled

One-time purchase

50 Scan Credits

$2.99 once

One credit checks one problem
No subscription, buy another pack when you need it
Opening saved solutions, guides and practice never uses a credit

US prices shown; your local price appears in the App Store or Google Play before you buy. A problem check uses one scan credit. For people without a subscription, generating a study guide or practice set also uses one scan credit, disclosed before you confirm, and a failed generation returns it. The subscription renews automatically until canceled; manage or cancel it in your App Store account or in Google Play. No free trial is offered.

Questions & Answers

Frequently asked questions

Does taking a photo immediately use a scan credit?

No. Every photo, gallery image, or typed problem goes into a preview first. Nothing is sent and no credit is used until you tap Check Problem.

Can I use the homework scanner app without creating an account?

Yes. No sign-in is required to scan problems or subscribe, and every new account starts with 10 free scan credits on Android.

Do I have to buy a monthly subscription to see the step-by-step work?

No. Every problem check includes the full numbered step-by-step solution. After your 10 free starter credits, you can buy a one-time pack of 50 Scan Credits for $2.99 (no subscription) or subscribe to Stemulus Pro for $4.99 per week.

What subjects does the homework scanner support?

Stemulus is built for STEM coursework: math (algebra, geometry, trigonometry, pre-calculus, calculus, statistics) and science (physics and chemistry) problems that can be solved step by step.

Available now on Android. Coming to iPhone, iPad, and Mac.

Stemulus requires Android 8.0 or later, or iOS 26.5, iPadOS 26.5, or macOS 26.5 or later, and is available in English.