Structured to learn.
Engineered to remember.
Cortex is a structured data-science syllabus that goes further than notes: a visual roadmap, interlinked lessons, timed quizzes, and spaced repetition that brings a topic back right before you would forget it.
- 44
- Interlinked notes
- 19
- Topic tracks
- 6
- Learning phases
The guiding idea: a structured curriculum you actually retain. Topics build in a deliberate order along a visual roadmap, then timed quizzes, spaced repetition, and cumulative recall bring each concept back right before you would forget it, so it sticks.
Everything you need to learn and retain
Six parts working together, from the first read to long-term recall.
A roadmap, not a reading list
The whole data-science journey as one branching map, from Python foundations to deployment. Flip between a simple phase overview and a detailed topic graph, and click any node to see exactly what to learn and jump into the notes.
- 6 phases
- Simple + detailed views
- Click for the syllabus
Notes that link themselves
Every topic is a focused note with KaTeX math, callouts, and diagrams. Wikilinks connect related ideas and backlinks appear automatically, so the material reads as a connected web, with a live table of contents down the side.
- Wikilinks
- Automatic backlinks
- Math & callouts
Timed quizzes that test judgement
Each note carries a bank of questions. A graded attempt samples a fresh, timed subset every sitting, so you cannot pass by memorising an order. Clear two-thirds to complete the topic; miss it and the quiz locks until its review is due.
- Strict wall-clock timer
- Fresh sample each time
- Locks on a miss
Spaced repetition, built in
Pass a quiz and the topic enters a review schedule that stretches out as you keep getting it right and snaps back when you slip. A daily "review due" pass stops what you learned from quietly fading away.
- SM-2 scheduling
- Widening intervals
- Daily review queue
Weekly and monthly recall
At the end of a study window, recall across everything you covered at once, interleaved, not one note at a time. Fall behind and the card turns amber and escalates, so the habit holds instead of silently lapsing.
- Interleaved across topics
- Weekly + monthly
- Escalates if you lag
Progress that stays yours
Completions, review schedule, recall history, and your scratchpad notes live in your browser, with no account to create and nothing uploaded. Back it all up to a single file and restore it on any device, any time.
- No account
- Local-first
- Export & restore
And the details that make it stick
The small, deliberate touches you feel on every page.
Flashcards mode
Flip the same question bank into untimed recall practice: hide the options, answer from memory, grade yourself.
Instant full-text search
Press Ctrl or Cmd + K anywhere to search every note in milliseconds, powered by a prebuilt Pagefind index.
Prerequisites, wired in
Each topic knows what to learn first. The roadmap and notes read one shared map, so the order never contradicts itself.
Per-note scratchpad
A private notepad on every page. Writing a topic in your own words is a small act of recall; it autosaves, locally.
Dark and light
Follows your system by default, remembers an explicit choice, and swaps with no flash of the wrong theme on load.
Write Markdown, commit, done
Add a note, commit, push. The site rebuilds and it is live in a minute or two. No CMS, no database, no build to babysit.
How a topic moves through Cortex
One loop, from first encounter to durable memory.
- 1
Read
Follow the roadmap into a focused, interlinked note.
- 2
Test
Take the timed quiz; clear two-thirds to complete it.
- 3
Review
Spaced repetition brings it back on a widening schedule.
- 4
Recall
Weekly and monthly sessions interleave everything you covered.
Start at the beginning of the map
Open the roadmap, pick a track, and read your first note. Your progress saves itself as you go, right in your browser.