Sigma (Private AI Browser) alternatives

Chromium-based browser with AI agent (navigates pages, fills forms), chat-with-page, deep research and an in-browser local LLM (Eclipse) for private on-device processing; macOS, Windows, iOS, Android beta. Full Sigma (Private AI Browser) record →

  1. 1 Perplexity Comet Browser-agent memory

    also in Browser-agent memory · same storage (vector, file) · same retrieval (similarity) · same memory unit (episode, document) · also offered managed

    OSS ? Self-host — Managed ✓ MCP ? Compare with Sigma (Private AI Browser) →

  2. 2 Botpress LLMz Framework-embedded memory

    same storage (vector) · same retrieval (similarity) · same memory unit (episode, document) · also offered managed

    OSS ✓ Self-host ✓ Managed ✓ MCP ✓ ★ 15k MIT (SDK/integration packages in… Compare with Sigma (Private AI Browser) →

  3. 3 Pydantic-AI + Hindsight Framework-embedded memory

    same storage (vector) · same retrieval (similarity) · same memory unit (episode) · also offered managed

    OSS ✓ Self-host ✓ Managed ✓ MCP ✓ ★ 20k released 2026-04-15 MIT Compare with Sigma (Private AI Browser) →

  4. 4 Abridge Vertical / domain-specific AI memory

    same storage (vector, file) · same retrieval (similarity) · same memory unit (episode, document) · also offered managed

    OSS ? Self-host — Managed ✓ MCP ? Compare with Sigma (Private AI Browser) →

  5. 5 Aleph Alpha PhariaAI / PhariaCatch Dedicated memory layers

    same storage (vector, file) · same retrieval (similarity) · same memory unit (document) · also offered managed

    OSS ? Self-host ✓ Managed ✓ MCP ? Compare with Sigma (Private AI Browser) →

  6. 6 Browserbase Browser-agent memory

    also in Browser-agent memory · same storage (file) · same memory unit (episode) · also offered managed

    OSS ? Self-host — Managed ✓ MCP ✓ Compare with Sigma (Private AI Browser) →

  7. 7 Friend Voice-first / wearable AI memory

    same storage (vector) · same retrieval (similarity) · same memory unit (episode) · also offered managed

    OSS ? Self-host — Managed ✓ MCP ? Compare with Sigma (Private AI Browser) →

  8. 8 Microsoft Edge Copilot Mode + Journeys (now Copilot in Edge) Browser-agent memory ⚠ renamed — now Copilot in Edge

    also in Browser-agent memory · same storage (file) · same retrieval (similarity) · same memory unit (episode) · also offered managed

    OSS ? Self-host — Managed ✓ MCP ? Compare with Sigma (Private AI Browser) →

Ranked by shared memory design (storage, retrieval, conflict handling, memory unit), same section and shared must-haves (open source, self-hosting, MCP), with adoption as a tie-breaker. ✓ confirmed · — no · ? not in the catalog yet. Want picks for your own requirements? Use the chooser. Checking a whole project? Check your stack.