Android tablet · adults 18 and older
Study the book. Write the proof.
Professor Euler is a free, non-commercial mathematics app for serious self-study, from high school through university. The textbook stays on the page. You write with a stylus. When you ask, your own AI provider reads the work you choose to send.
eiπ + 1 = 0
Read
Fifty textbooks and course resources, in English and German, from algebra and calculus through analysis, probability, and the mathematics of machine learning. Reading works offline.
Write
A large Android tablet and a stylus are the intended desk. Keep the printed page in view and develop a calculation, a proof, or a diagram in your own handwriting.
Check
AI grading looks at the handwritten solution you submit. It can miss a step, and it is not a formal mark. You bring your own provider key. Charges and eligibility are the provider’s.
Six study paths
The curriculum is a set of books the app can legally share. You study the authors’ text. The app does not replace those licenses.
Algebra through precalculusAlgebra, geometry, trigonometry, and precalculus.
Proof and linear algebraCalculus, linear algebra, proofs, discrete mathematics, number theory, and abstract algebra.
AnalysisReal and complex analysis, topology, measure and integration, and functional analysis.
Equations and computationOrdinary and partial differential equations, numerical methods, and optimization.
ProbabilityProbability, statistics, statistical inference, and stochastic processes.
Learning machinesThe mathematics of machine learning and deep learning.
Among the books: OpenStax Calculus, Richard Hammack’s Book of Proof, Sheldon Axler’s Linear Algebra Done Right and Measure, Integration & Real Analysis, and Simon J. D. Prince’s Understanding Deep Learning. My books is separate: you import your own PDFs, and those files stay yours to supply.
No Professor Euler account
Profiles live on the device. There is no subscription and no advertising. Optional AI uses Gemini, DeepSeek, OpenRouter, or DeepInfra with a key you provide.
Google sign-in is optional and off until you turn on sync for a profile. It reaches only a hidden folder in your own Google Drive, plus the email address of that account, so another device can open the same study files. The built-in textbooks are not uploaded. API keys stay on the device. The privacy policy is the full account of this, and the same text is published at github.com/dawei7/professor-euler-privacy.
Made in Switzerland
David Schmid built Professor Euler for the way he wants to study: keep the depth, and make the desk comfortable. The tutoring voice in the app is a fictional tribute to Leonhard Euler, not the historical man.
A 10-inch or larger Android tablet is recommended. The offline library needs several gigabytes. Questions: ai.professor.euler@gmail.com.