Photomath, Khanmigo, Desmos, Mathway, Symbolab and ChatGPT each fit a different study need, and five of the six have a free version.
Whether an app works better than Gauth depends entirely on the subject you study and whether you want direct answers or guided practice. In the guides we publish here at Chalkbox, we examine classroom software so students and educators know their options before choosing study tools. If you want photo math with clear step-by-step breakdowns, Photomath has a free Basic plan with step-by-step explanations. If you want interactive practice rather than handed solutions, Khanmigo prompts you to think through each problem. For graphing equations, Desmos is free. For typed problems, Mathway covers 11 subjects including chemistry and physics, and Symbolab covers pre-algebra through calculus. For plain-English explanations of difficult ideas, the Free plan of ChatGPT includes unlimited text chats.
| App | Maker | What It Does | Free Version | Paid Price | Best For |
|---|---|---|---|---|---|
| Gauth | Gauthtech Pte. Ltd. (US operated by TikTok USDS Joint Venture LLC) | Photo scanner, AI tutor and human experts across STEM | Free download, question limits not published | $11.99/month, $31.99/quarter or $99.99/year (App Store list prices) | Scanning many subjects, with optional 24/7 human experts |
| Photomath | Google LLC | Photo scanner, arithmetic through calculus, with visual aids | Basic plan ($0 USD) with step-by-step explanations | $9.99/month or $69.99/year | Math-only photo scanning with free written steps |
| Mathway | Chegg, Inc. | Photo and typed solver for 11 math and science subjects | Free steps with no sign-up (full work for every step needs a subscription) | $9.99 to $19.99/month or $39.99 to $79.99/year (App Store list ranges) | Typed problems in 11 subjects, including chemistry and physics |
| Symbolab | Eqsquest Ltd / Learneo, Inc. | Step-by-step calculator, pre-algebra through calculus | Free solutions with basic steps (App Store listing) | $2.49/week to $39.99/year (App Store in-app purchase list) | Typed or photographed math, including word problems |
| Khanmigo | Khan Academy | Socratic AI tutor that guides you with questions | Not listed for learners (Khan Academy's teacher and student tools are free) | $4/month or $44/year | Learning without being handed answers |
| Desmos | Desmos Studio PBC | Graphing Calculator and other free math tools | Fully free suite of math tools | Not shown on site | Visualizing functions, curves and coordinates |
| ChatGPT | OpenAI | AI assistant for open conversation | Free plan with unlimited text chats on GPT-5.6 Luna | Free plan $0 (paid plans not compared here) | Plain-English explanations of concepts and topics |
Photomath and Gauth both solve a problem from a photo, but Photomath's App Store listing describes a math-only app. Photomath scans problems from basic arithmetic through calculus, whether handwritten, printed in a textbook or shown on a screen. Photomath publishes what its free Basic plan includes: step-by-step explanations, custom visual aids, and extra "how" and "why" tips. Our guide to whether Photomath is free covers each Photomath plan.
Gauth, available on the Apple App Store and Google Play, covers math alongside biology, chemistry, and physics. However, its free tier policies are less clear. While the Google Play description claims Gauth offers unlimited answers, it simultaneously lists unlimited answers as a paid Gauth Plus benefit. Gauth does not publish its free-question limit, so check what the Gauth app shows you. Our guide to whether Gauth is free covers Gauth's plans and free trial.
Paid subscriptions also differ in price. Photomath Plus costs $9.99 USD monthly or $69.99 USD annually, adding animated tutorials and textbook solutions. Gauth Plus lists App Store auto-renewing subscriptions at $11.99 monthly, $31.99 quarterly, or $99.99 annually, though actual prices vary by region. Gauth also advertises human experts available 24/7, a feature Photomath does not list. If your coursework is only math, start with Photomath's free Basic plan.
Pick Gauth to solve a photographed problem and ChatGPT to talk through an idea. Gauth is built specifically as a homework companion. You open Gauth, point your camera at an equation or textbook question, and Gauth recognizes the question, crops it and solves it. Gauth also has AI Live Tutor, an AI tutor you talk to by voice that explains on a virtual whiteboard, and a "DeepThinking" mode.
ChatGPT functions as an open-ended conversational partner rather than a dedicated scanner. On the ChatGPT pricing page, the Free tier provides unlimited text chats with GPT-5.6 Luna, subject to abuse guardrails, along with limited file uploads and image creation. ChatGPT's Free plan limits file uploads, so you will mostly type your question into ChatGPT. In the same chat, you can ask follow-up questions, request simpler analogies, or ask why a specific mathematical property applies. For broader tools in this category, read our overview of AI math tools for students.
If you have a worksheet of algebra problems and want the steps for each one, Gauth is built for that job. If you read a solution and do not understand the underlying concept, paste that step into ChatGPT and ask for a plain-English explanation.
Answer apps help learning only if you rework every step yourself rather than copying down the result. If you want to learn the method, Khanmigo and Desmos make you do the work instead of handing you the answer.
Khanmigo, created by Khan Academy, takes the opposite approach of traditional homework apps. The Khanmigo learners page says Khanmigo "helps you flex your brain muscles by never giving you the answer." Instead, Khanmigo says you will be "prompted to think deeply and critically in order to solve problems." The learner subscription costs $4 per month or $44 per year. For teachers, the Khan Academy teacher portal notes that Khan Academy rebuilt its free classroom and student tools. If you want other tutoring assistants, consult our guide to Khanmigo alternatives.
Desmos is run by Desmos Studio, a Public Benefit Corporation. Desmos says its free suite of math tools, including its Graphing Calculator, is used by over 75 million people a year. Desmos does not describe a photo-solve feature. Instead, Desmos lets you graph an equation and see how the curve changes when you edit it. Our guide to AI for learning math covers more ways to study math with AI.
To use any answer-generating software responsibly, follow a three-step study routine:
Gauth's store listings and Terms name these companies:
Both store listings confirm that Gauth is actively listed and downloadable on the United States App Store and Google Play as of October 2026.
Regarding user age, both the US and rest-of-world terms require users to be at least 13 years old, or meet their jurisdiction's minimum age requirement. Users under the age of majority must have express permission from a parent or legal guardian. The App Store rating of 4+ and the Google Play rating of Everyone are store content ratings. The 13+ rule comes from Gauth's Terms.
On schoolwork, Gauth's terms state that users commit to upholding the highest standards of academic integrity. The terms say Gauth should not be used "to complete exams, quizzes, or assignments when such actions are prohibited by your academic institution." The gauth.com footer adds: "Gauth is an AI study companion designed to support learning, not a substitute for students' own work." Each school sets its own rules on AI use. Our guide on whether using AI is cheating covers how to use AI within your school's rules.
Gauth fits students who want an all-in-one mobile app to scan assignments across multiple sciences, algebra, and calculus in one place. Gauth crops a photographed problem automatically, and Gauth Plus lists 24/7 tutor help for when the AI explanation is not enough.
If you want free step-by-step math explanations from a plan that lists what it includes, start with Photomath's Basic plan. If your homework means typing problems in chemistry or statistics, Mathway covers both, and our guide to Mathway alternatives compares similar solvers. If your teacher bans outside answer generation entirely, using Gauth violates your course policies. In that case, ask your teacher whether a tutor like Khanmigo or a graphing calculator like Desmos is allowed.
Test your options on your own homework. Pick one free alternative tonight, scan a math problem you have already completed, and compare the app's written steps against your own work.
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Yes, if you need a specific type of help rather than an all-in-one solver. Photomath gives free step-by-step math explanations from a photo. Khanmigo tutors you instead of giving the answer, Desmos graphs for free, and ChatGPT's Free plan explains ideas in plain language.
Photomath is better for pure mathematics because its free basic plan includes step-by-step explanations, custom visual aids, and extra tips at no cost. Gauth is better if you need help across non-math subjects like biology, chemistry, and physics, or want access to human tutors.
ChatGPT is better for open conversation and conceptual explanations on its free tier, while Gauth is better for automatically cropping and solving textbook photos across STEM subjects. ChatGPT's Free plan limits uploads, so you mostly type your question, while Gauth is built around photographing the problem.
Gauth lets you photograph a problem in math, biology, physics or chemistry and get the steps, with optional help from human experts. However, Gauth does not publish its free question limit, and its Google Play listing contradicts itself on unlimited answers. Check each solution against your own work.
Using Gauth becomes cheating when you submit its generated steps as your own work on graded homework, quizzes, or tests where outside help is prohibited. Gauth's own terms require users to uphold academic integrity and say not to use Gauth to complete exams, quizzes, or assignments when your school prohibits it. Each school sets its own rules on AI use.