Turn any lesson into a course you actually learn from.
Orbily is an AI study app: it reads your photos, recordings and PDFs, then builds structured courses, flashcards, quizzes and graded corrections. Made for students who study solo.
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Calculus · Differentiation
2 / 7
lessons completed
Review
7 cards due today
Lessons
The concept of a limit
Completed · 92%
Limits and operations
Completed · 86%
Differentiability at a point
In progress · section 3 of 5
Resume
Rolle’s theorem
Up next · 9 min
Goal
Final exam
5 lessons left to complete
Resources
From raw material to mastery in three steps
Import anything
Snap a photo of your notes, record a lecture, or drop in a PDF. Orbily extracts and understands the content.
Let AI build your tools
Get a full multi-lesson course, flashcards, quizzes, summaries and formula sheets, generated and adapted to the subject.
Study and track progress
Learn with active recall, time your sessions, keep your streak, and watch your performance grow.
One app for the whole study loop
AI Courses
Full multi-lesson courses from your material
Orbily's flagship tool. Feed it a chapter, a stack of photos or a recording and it writes a structured, multi-lesson course complete with a plan, checkpoints, a final exam and progress tracking. Each notion is explained, illustrated and anchored with worked examples adapted to the subject.
FeaturesCalculus · Differentiation
2 / 7
lessons completed
Review
7 cards due today
Lessons
The concept of a limit
Completed · 92%
Limits and operations
Completed · 86%
Differentiability at a point
In progress · section 3 of 5
Resume
Rolle’s theorem
Up next · 9 min
Goal
Final exam
5 lessons left to complete
Resources
Orby chat
A tutor that shows, not just tells
Orby is your AI study partner. Ask a question and it answers in clear prose. When it helps, it draws graphs, builds interactive quizzes, generates flashcards and renders tables and equations right in the conversation. Link your own chapters so it grounds its answers in your material.
FeaturesExplain Rolle’s theorem to me
If f is continuous on [a, b], differentiable on (a, b) and f(a) = f(b), then there is a c in (a, b) with f′(c) = 0: the tangent is horizontal there.
Example: f(x) = x² − 4x satisfies f(1) = f(3) = −3, and indeed f′(x) = 2x − 4 vanishes at c = 2.
What does Rolle’s theorem guarantee?
Correct. Rolle gives you that c exists, not its value.
Flashcards
Spaced repetition, Quizlet-style swipes
Turn any lesson into an atomic flashcard deck. Study with a free 2D swipe where the card follows your finger, and Orbily schedules reviews with a lightweight spaced-repetition system so you revisit exactly what you're about to forget.
FeaturesFlashcards
Calculus · Differentiation
24 cards
17 known · 5 due · 2 new
AI Correction
Grade your work like a real teacher
Photograph your answer and Orbily grades it out of 100, citing exactly what you wrote, question by question or against discipline-specific criteria. You get a verdict, strengths, what to rework, and detailed corrections. Add the assignment as a photo or text for sharper grading.
FeaturesAI grading
Good
4 correct · 2 partial · 1 wrong
Solid reasoning. Two implicit justifications cost you most of the lost points.
Feedback
✓ What works
· Q1 to Q3: product and quotient derivatives are right
· Q6: Rolle’s hypotheses checked before applying it
→ To review
· Q5: continuity on [1, 3] is stated but never justified
· Q7: conclude on (1, 3), not on all of ℝ
Study Timer
Focused sessions that count toward your streak
A focus-mode timer built for deep work. Pick a duration or go open-ended, choose your subject, and study inside a calm progress ring. Browse your linked chapters without leaving the session, ask Orby for help, and every minute feeds your revision time and streak.
FeaturesLesson 3 · Differentiability at a point
Smart Import
Photo, audio or file: Orbily reads it all
Three doors into Orbily: snap photos of your notes, record a lecture, or drop in PDFs and text files. AI extracts a clean, canonical version of the content and files it into the right folder and chapter, the single source every study tool builds on.
FeaturesContent
Calculus · Differentiation
7 lessons · 24 cards
History · The Cold War
5 lessons · 18 cards
Physics · Mechanics
6 lessons · 21 cards
Photo
Textbook pages, handwritten notes
Record
Capture a lecture as it happens
File
PDF, Word or plain text
Everything in your pocket
Questions, answered
Orbily is out now. Download it free on the App Store and Google Play and start studying in minutes.
Orbily is free during early access. We'll introduce fair, student-friendly pricing later, and early members will get the best deal.
All of them. Orbily adapts to maths, sciences, languages, history, philosophy, economics and more: the AI tailors the course structure to each discipline.
Generating content needs a connection, but once a course is created it renders fully offline: text, maths, chemistry, graphs and code included.
Yes. Orbily is a solo study app: no social feed, no public profile. Your content stays yours. See our privacy policy for details.
Your next study session starts now
Download Orbily free on the App Store and Google Play.