Word problem & calculus solver · Available now on Android

Turn multi-sentence word problems into clear equations.

Scan or type algebra, inequality, system-of-equations, pre-calculus, and calculus problems on Android. Stemulus translates the English prompt into mathematical expressions, works every step in order, verifies the arithmetic, and generates targeted practice questions.

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

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

Algebra · Inequality Word Problem

A student has budgeted at most $120 for a tutoring service that charges a $24 registration fee plus $16 per hour h. What is the maximum number of hours the student can book?

Step by step.

Translate the budget constraint into a linear inequality 24 + 16h ≤ 120 The fixed fee ($24) plus the hourly cost (16h) must be less than or equal to $120.
Subtract the fixed fee from both sides 16h ≤ 96 Subtract 24 from both sides: 120 − 24 = 96.
Divide by the hourly rate and verify boundary h ≤ 6 ⇒ 24 + 16(6) = 120 Dividing by positive 16 preserves the inequality direction.

Solution

h ≤ 6 hours (maximum 6 hours)

Arithmetic checks passed

Built for word problems & symbolic math

See how the equation is built before solving it.

Calculator apps that only read pure equations fail as soon as a problem is written as a paragraph. Stemulus handles both multi-sentence word problems and symbolic calculus.

Sentence-to-equation translation in Step 01

For word problems, Stemulus explicitly defines the variables and shows how each phrase in the prompt maps to an equation, system of equations, or inequality.

Step-by-step limits, derivatives, and integrals

For Pre-Calculus and Calculus, Stemulus shows the algebraic simplification, factoring, L'Hôpital's rule, chain rule, or integration technique step by step.

Substitution check to catch sign and boundary errors

Where supported, Stemulus substitutes the solved roots or boundary values back into the original equation or inequality to confirm the arithmetic.

One-tap LaTeX copy for typed homework

Copy any equation or worked step as clean LaTeX for digital math submissions, Markdown notes, or study sheets.

Math courses covered

From Algebra 1 word problems to Calculus limits and derivatives.

Scan printed worksheets, textbook pages, or handwritten problems across high school and college math.

Algebra 1 & 2

Linear, Inequality & System of Equations Word Problems

Rate-time-distance, mixture and percent problems, linear inequalities, two-variable systems of equations, quadratics, rational expressions, and exponential growth.

Pre-Calculus & Trig

Functions, Logarithms, Sequences & Trigonometry

Domain and range, composite and inverse functions, logarithmic equations, arithmetic and geometric series, unit circle, trig identities, and polar coordinates.

Calculus & Statistics

Limits, Derivatives, Integrals & Probability

Calculus limit solver with steps, product/quotient/chain rules, implicit differentiation, optimization word problems, definite and indefinite integrals, and descriptive statistics.

Don't just copy, learn the pattern

Practice similar word problems until you can set them up solo.

01 · Assignments

Save word problems into a named assignment

Group homework problems from a chapter or DeltaMath/WebAssign unit and mark the ones you struggled to set up as Still stuck.
02 · Study guide

Generate a study guide for that problem set

Stemulus summarizes the key equation templates, formulas, and worked examples from your assignment so you can see the pattern across problems.
03 · Practice

Solve three new word problems with progressive hints

Start a practice round that prioritizes your Still stuck problems. Reveal Hint 1 to check your equation setup before solving the rest on your own.
04 · Offline

Review saved work and practice rounds offline for free

Reopening saved solutions, study guides, and practice sets never costs a credit and works offline on your Android device.

Why progressive hints beat full-solution spoilers on word problems

Reading a finished solution to a word problem always makes sense in hindsight, until you face a blank page on the quiz and don’t know how to write the first equation.

With Stemulus on Android, you can turn any homework assignment into a three-question Practice Round (see how the STEM Study Guide Generator works). On each practice problem, you can tap Reveal Hint 1 just to verify how to define the variables and set up the equation, then finish the algebra yourself and check your answer. Need help with other STEM courses? Explore our Geometry Solver App, Physics Solver App, and Chemistry Solver App.

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

Can Stemulus solve inequality word problems and systems of equations?

Yes. Stemulus translates single-variable and multi-variable word problems, including linear inequalities, systems of equations, quadratic applications, and optimization problems, into equations and solves them step by step.

Does Stemulus show steps for pre-calculus and calculus limit problems?

Yes. You can scan or type pre-calculus and calculus problems, including limits, derivatives, and integrals, and get a numbered step-by-step breakdown with textbook math rendering.

How much does the word problem solver app cost on Android?

You get 10 free scan credits right away with no sign-in required. After that, you can buy a one-time pack of 50 Scan Credits for $2.99 (no subscription) or subscribe to Stemulus Pro for $4.99/week.

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.