Bring your own model
Use the Claude Code or Codex CLI you are already logged in to, or an OpenRouter key.
Tutor
Ask better questions.
Ask the tutor about the note in front of you. Explanations stay grounded in the material you are studying, so the answer matches your course's notation and scope.
- Context
- The open note
- Providers
- Claude Code · Codex · OpenRouter
- Auth
- CLI login or API key
- Keys
- Kept in the main process
Concrete — Tutor
Recorded in Concrete
How it works
Three steps.
- 1
Open
Open a note. The tutor reads it as context.
- 2
Ask
Ask for a derivation, an analogy, or a check of your reasoning.
- 3
Keep
Copy the parts worth keeping into your note, in your own words.
Up close
Ask about the note that's open.
An illustrative example, drawn in the app's Concrete theme.
Tutor · kinematics.md
Why does the ½ appear in x = v₀t + ½at²?
Grounded in kinematics.md
Your note defines velocity as v(t) = v₀ + at. Displacement is the area under that line: a rectangle v₀t plus a triangle with base t and height at. A triangle's area is ½ · base · height, which gives ½at².
So with zero acceleration it's just the rectangle?
Why it matters
Scoped
Answers are anchored to the note, which keeps explanations from drifting off-syllabus.
Private by default
API keys never reach the renderer. They stay in Electron's main process.
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Flashcards with spaced repetition.