Stoa · ΣΤΟΆ · A free academy
A modern
free academy.
An online library of knowledge on everything that matters: business, philosophy, mathematics, history, economics.
Free, always.
55+ schools · 1800+ articles · 4 tracks · 2 languages
Tracks
All tracks →- — Antiquity10 schools · 21 clusters · 21 exams · 3 months
Where it begins.
From Socratic questioning to stoic discipline. The school that shaped every other.
Open the track → - — Humanities14 schools · 336 articles · 8 months
The full library.
Philosophy, history, rhetoric, literature, art, ethics, mythology, science of science, language.
Open the track → - — Business22 schools · 1019 articles · 12 months
Strategy made readable.
Economics, finance, real estate, communication, leadership, decision psychology, public policy.
Open the track → - — Mathematics22 schools · 351 articles · 5 years (taken at university pace)
The other kind of rigor.
Analysis, algebra, geometry, probability, optimization, neural networks, complex systems.
Open the track →
Ten instruments
AI is the working librarian here — and the sparring partner. Each instrument is named in Greek, made for one purpose, and free.
— MAIEUTICS
Socratic dialogue.
You bring a thesis. The AI argues against it in six to ten rounds. You leave with a thesis that has been tested.
Begin maieutics →— ELENCHUS
Crash-test of ideas.
Describe an idea. The AI finds its weakest joints the way Socrates did — without softening.
Test an idea →— EPHEMERIS
Daily stoic.
Each morning, one short practice in the manner of Marcus Aurelius. Three minutes. One decision.
Get tomorrow's practice →— GYMNASIUM
Simulator.
A situation. Two schools argue. You are the third.
Open the gymnasium →— EXETASIS
Examination.
An eight-question exam, generated for the article you just closed. Not memory — understanding.
Take the exam →— LOGISMOS
Calculation.
Numerical problems with steps shown. Economics, finance, mathematics — worked, not announced.
Solve a problem →— ANAMNESIS
Recollection.
Spaced repetition by the schedule of the ancients: today, in three days, in a week, in a month. The mind does the rest.
Open your trail →— CHRONIKA
The chronicle.
One long article each day, written for you from the courses you are studying. No feed. A daily.
Read today's →— PAIDEIA
The tracks.
Four curated paths — antiquity, humanities, business, mathematics — sequenced month by month for a year of study.
Choose a track →— ASKESIS
The drills.
Twenty-stage trainers for French and for mathematics. Personalised by your level. Daily. Short. Sharp.
Begin training →
Manifesto · in brief
"The library does not need a key.
It asks something else of you."
Stoa is a free library of canonical knowledge — Aristotle on rhetoric, Euclid on the line, Kant on judgement, Keynes on liquidity. Not authorial essays. The base of knowledge an educated person used to have, organised into a path you can walk.
Built for a heroic education.
Difficult, long, rewarding the effort. The instruments are 2,500 years old. The interface is new. The reading is free.
From the library
Open the library →
STOICISM
Stoicism: The Complete Guide
A 2,300-year-old philosophy that refuses to die — and the practical case for letting it shape your week.
32 MIN
CALCULUS
Calculus & Linear Algebra: The Complete Guide
The mathematics that runs modern science and engineering — explained without the textbook condescension, and without the YouTube oversimplification.
36 MIN
DCF & CORPORATE FINANCE
DCF Valuation: The Complete Walkthrough (with a Worked SaaS Example)
The valuation method that the finance industry treats as foundational — explained without the bullshit, with a complete worked example and a downloadable Excel model.
36 MIN
HOW TO THINK BETTER
Logical Fallacies: The Complete List with Examples
The errors of reasoning that have plagued public discourse for two thousand years — catalogued, named, and illustrated with examples you have probably encountered this week.
38 MIN
PRIVATE EQUITY
Private Equity: A Complete Guide (How PE Actually Works)
The industry that runs trillions of dollars and answers to almost no one — explained from the inside, with the parts the marketing brochures leave out.
40 MIN
In the studio
— Series one: Ancient minds in modern rooms
Twelve episodes. Twelve thinkers from antiquity brought into the rooms they were never built for — the boardroom, the gym, the algorithm.
Start listening →
— Series two: Socratic defeats
Famous arguments tested by the method that built them.
[Coming summer MMXXVI]
What is here
55+
Schools
1800+
Articles
10
AI instruments
The canon, curated with AI. Free, always.
ἀγεωμέτρητος μηδεὶς εἰσίτω
"Let no one ignorant of geometry enter."
— inscription above the entrance to Plato's Academy