Directory

OpenAI's consumer and workplace assistant, available on the web, desktop and mobile, with projects, plugins, browsing, voice and the Codex coding agent

Anthropic's consumer and team assistant on web, desktop and mobile, with projects, artifacts, memory, connectors and web search, sold on Pro, Max, Team and Enterprise plans

Google's consumer assistant on web, Android and iOS, with Gemini Live voice, Deep Research, Canvas, Gems and image and video generation, tied to Google AI subscription plans

Open-source, outliner-based knowledge base storing notes as local Markdown or Org-mode files with block references, queries and a graph view

Hosted workspace combining block-based documents, relational databases, wikis and project views, with an API and built-in AI features

Local-first Markdown note-taking app with bidirectional links, graph view and a large community plugin ecosystem; optional paid Sync and Publish