Heptabase
Free tierMaster anything you learn. Do your best research with AI.
Free tier available·All audiences·Powered by Google (Gemini), OpenAI (GPT), Anthropic (Claude)·API available
Key strengths
Visual whiteboard-based knowledge organizationAI Tutor with structured personalized learning sessionsBi-directional links and block-based editorMulti-model AI agent support (GPT, Claude, Gemini)PDF annotation and YouTube transcript integrationCLI agent compatible with Claude Code and Codex
Free tier + paid plans · from $8.99 USD/mo
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- Research pipelines: Ingest PDFs with annotation, pull YouTube transcripts, and clip web content — then link all sources bi-directionally across whiteboards via the block editor.
- Multi-model AI workflows: Switch between GPT, Claude, and Gemini agents within the same workspace; use the CLI-compatible agent with Claude Code or Codex for automated or terminal-based knowledge tasks.
- Reference management: Zotero and Readwise integrations allow syncing of citations and highlights directly into the note graph.
- API automation: Use the public API to build custom ingestion, export, or sync workflows on top of the Heptabase knowledge base.
- Credit-aware AI usage: Design workflows around the tiered AI credit system (100 / 1,800 / 8,100 per month) to manage cost at scale.