Stoa lets you talk with thinkers of the past as if they were sitting in front of you. Ask Aristoteles what makes a life good, Sokrates what courage is, or Marcus Aurelius how to handle anger, and get an answer drawn only from their own writings and the testimonies of the people who knew them, in their own register, inside their own lifetime. No invented quotes: every persona is built from public-domain primary sources, with the bibliography published.

Three ways to use it. Chat in the browser: the first question is free, no account needed, then pay as you go with credits and a choice of models. Own a mind as a downloadable skill: the complete persona (full works, voice profile, install guide, license key) that installs into your own ChatGPT, Claude or Gemini in about a minute, one purchase, yours to keep, 29.95 EUR. Or commission a persona: any figure with a public-domain record built to order for a classroom, a library or yourself.

Eleven minds so far: Marcus Aurelius, Seneca, Epictetus, Sokrates, Platon, Aristoteles, Confucius, Lao Tzu, Sun Tzu, Cicero and Lucretius, with more added regularly. Also includes Stoic answers to real problems (anxiety, grief, procrastination, control) and a Wisdom library by philosopher and topic. iPhone app coming.

Built for students and teachers of philosophy, classics and history, readers of Stoicism, and anyone who would rather ask a Stoic than a generic chatbot.