# WorldBrain/Memex

Browser extension to curate, annotate, and discuss the most valuable content and ideas on the web. As individuals, teams and communities.

Repository: https://github.com/WorldBrain/Memex
Canonical: https://ross.abutalabs.com/products/memex
Homepage: https://worldbrain.io
Language: TypeScript
License Family: other
Topics: web-extension, chrome-extension, firefox-addon, typescript, javascript, full-text-search, browser-extension, annotations, annotation, annotate, note-taking, research
Last push: 2025-12-02T02:31:07+00:00

## Health v2 (maintenance only)
Score: 48/100 (v2, computed 2026-09-03T02:39:23.370411+00:00)
- activity 55, release rhythm 8, longevity 100
- inputs: {"age_days": 3441, "days_push": 275, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_license
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 4715, forks 357 (observed 2026-08-28T04:08:57.421834+00:00)

## What it is
Memex is a browser extension (Chrome/Firefox) for curating, annotating, highlighting, tagging, and full-text searching web content and PDFs, with encrypted sync and mobile companion apps. It also exposes an MCP server so AI agents can search and act on a user's saved knowledge base.

## Use cases
- full-text search across all pages I've visited and bookmarked
- highlight and annotate web pages and PDFs
- organize research with tags, lists, and bookmarks
- sync my web research across desktop and mobile with encryption
- let my AI assistant search my saved web research via MCP
- summarize and ask questions about pages, videos, and PDFs I saved
- import and auto-tag content from YouTube, RSS, and Reddit channels

## When to choose
- you need searchable, annotated archives of everything you read online
- you want a privacy-focused, self-funded alternative to VC-backed bookmarking tools
- you want your personal knowledge base accessible to AI agents via MCP
- you research across websites, PDFs, and videos and need highlights plus notes in one place

## When to avoid
- you only need simple bookmark syncing built into your browser
- you need a team wiki rather than personal web research curation
- you require a formally licensed open-source build - the repo currently lists no license

## Facets
- artifact type: plugin
- maturity: active
- function: search-engine, nlp, mcp, chatbot, developer-tools
- domain: browser-extensions, developer-tools, privacy
- platform: browser-extension, browser, cross-platform
- tags: web-extension, annotations, full-text-search, note-taking, bookmarks, second-brain, knowledge-management, typescript, encrypted-sync, mcp-server, research, natural-language-processing, android, ios

## Member repositories
- WorldBrain/Memex (main) score 48

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:08:57.421834+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-29T18:19:08.080695+00:00, confidence not recorded.
  - readme: https://github.com/WorldBrain/Memex (fetched 2026-08-28T04:08:57.421834+00:00, sha 0659f41ee50c)
  - homepage: https://worldbrain.io (fetched 2026-08-29T09:03:12.430676+00:00, sha 5804477b0c05)
- Data as of 2026-08-30T08:39:29.467469+00:00.