Pricing

Choose your path

All plans include Socratic teaching, LaTeX rendering, real-time streaming, and LLM model support. Upgrade or cancel anytime. Every tier supports your own AI provider keys.

Diophantus
Free — basic access
$0
forever free
  • Up to 5 saved sessions
  • 1 LLM provider key
  • Standard teaching quality
  • Web search —
  • Community support
Get started
Riemann
For regular learners
$9/month
billed monthly
  • Up to 50 saved sessions
  • 3 LLM provider keys
  • Advanced teaching quality
  • Web search enabled
  • Email support
Subscribe
Descartes
For serious students
$19/month
billed monthly
  • Up to 200 saved sessions
  • 5 LLM provider keys
  • Advanced teaching + depth control
  • Web search enabled
  • Priority email support
Subscribe
Premium
Euclid
For power users & teams
$39/month
billed monthly
  • Unlimited saved sessions
  • Unlimited LLM provider keys
  • Max teaching depth & customization
  • Web search enabled
  • Priority support & early features
Subscribe

All prices in USD. Cancel anytime. You bring your own API keys — we never charge for model usage.

Detailed comparison

Feature Diophantus Riemann Descartes Euclid
Saved sessions 5 50 200 Unlimited
LLM provider keys 1 3 5 Unlimited
Supported providers OpenAI, Anthropic, compatible OpenAI, Anthropic, compatible OpenAI, Anthropic, compatible OpenAI, Anthropic, compatible
Web search — Enabled Enabled Enabled
LaTeX rendering Enabled Enabled Enabled Enabled
Real-time streaming Enabled Enabled Enabled Enabled
Knowledge graph Basic Full Full Full + export
Diagnostic questions Enabled Enabled Enabled Enabled
Support Community Email Priority email Priority + early access
FAQ

Frequently asked questions

Yes, all tiers require you to bring your own LLM provider API key (OpenAI, Anthropic, or any OpenAI-compatible endpoint). Socrates does not charge for model inference — you only pay for platform features. The free tier supports 1 key; premium tiers support more.
Diophantus (free) gives you up to 5 saved sessions, 1 LLM provider key, standard teaching quality, community support, and all core features like LaTeX rendering and real-time streaming. No credit card needed — just bring your API key and start learning.
Euclid is our premium tier. It offers unlimited saved sessions, unlimited LLM keys, maximum teaching depth and customization, priority support, and early access to new features. It's designed for power users, researchers, and teams who rely on Socrates daily.
Absolutely. Subscriptions are month-to-month with no long-term commitment. Cancel anytime from your profile settings — your access continues until the end of the billing period.

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No credit card required. Bring your API key and begin your learning journey.

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