The bookmark manager is having a renaissance. In 2026, "save this link" is not enough — researchers, writers, and knowledge workers need smart capture that extracts content, generates summaries, and makes everything searchable by meaning. Three extensions lead the pack. Here is how they compare.
1. Glassy Companion
Glassy Companion is the browser extension for the Glassy knowledge workspace. It captures web content directly into your Glassy corpus, where it is indexed for hybrid search and exposed via the MCP server to AI agents. See the extension page for installation details.
Capture types: Article, Video (with transcript), Repository (GitHub), Product, Research (academic papers), Highlight (selected text), Screenshot (full page or region), Bookmark. Eight structured capture types, each producing Markdown with frontmatter.
AI features: Auto-tagging runs locally via WebGPU (no cloud API key needed). Captured content is cleaned and structured — Readability extraction for articles, transcript extraction for videos, README extraction for repos. The content is preserved as Markdown in your Glassy notes, not just a URL.
Search: Hybrid BM25 + vector search across your entire Glassy corpus — not just bookmarks, but notes, documents, and Obsidian vault files. Semantic search means you find captures by meaning, not by remembering exact titles.
Integrations: MCP server exposes captures to Claude, Cursor, Windsurf, OpenCode, Hermes, Openclaw, Pi, and any MCP-compatible AI agent and Cursor. Obsidian sync flows captures into your vault. RSS reader auto-captures feed items. Voice Studio for audio capture. All content lives in one queryable corpus.
Privacy: Auto-tagging runs on-device. Content is stored on Glassy's server (or your own Docker host). Self-host option available. No third-party data sharing.
Offline: Captures queue offline and sync when connection returns. No data lost when you are on a plane or in a tunnel.
2. AltShift+
AltShift+ is an AI bookmark manager built for researchers and knowledge workers. It turns pages, screenshots, and shared links into a private AI bookmark library with summaries, OCR, and smart tags.
Capture types: Pages, screenshots, shared links. Mobile-ready sharing via iOS/Android share sheet. Captures include original source, visual preview, tags, and a short AI-generated brief.
AI features: AI summaries, smart tags, OCR for screenshots. Collections keep source, context, and next steps together. Search by meaning, not just keywords.
Search: Semantic search across your capture library. Find sources by topic, phrase, or category — not just by folder.
Privacy: KMS-backed encryption protects saved captures. Cloud-hosted — no local AI option. Free tier caps at 100 captures.
Limitations: No MCP server or agent integration. No Obsidian sync. No voice capture. No self-host option. Cloud-only AI means your content is processed on someone else's server.
3. TabStash
TabStash is a bookmark manager focused on speed and simplicity. One-click save, semantic search, and cross-device sync. Chrome extension, Raycast integration, and a bookmarklet.
Capture types: Any page, one click. Titles, descriptions, and favicons grabbed automatically. No structured content extraction — it saves metadata, not full article text.
AI features: Automatic summaries for every bookmark. Semantic search understands what a page is about, not just the words in the title.
Search: Semantic search from the web app, StashBar overlay, or Raycast. Three organization layers: folders, tags, and smart folders that auto-populate based on filters.
Privacy: Cloud-hosted with cross-device sync. Export anytime. No local AI, no self-host option.
Limitations: Saves bookmarks, not content. If the original page goes down, you have a URL and a summary, not the full article. No MCP integration. No Obsidian sync. No voice capture. No structured capture types.
Feature comparison
| Feature | Glassy Companion | AltShift+ | TabStash |
|---|---|---|---|
| Capture types | 8 structured | 3 (page, screenshot, link) | 1 (bookmark) |
| Full text extraction | Yes (Readability) | Yes | No (metadata only) |
| Local AI tagging | Yes (WebGPU) | No (cloud) | No (cloud) |
| Semantic search | Hybrid (BM25+vector) | Yes | Yes |
| MCP / Agent integration | Yes | No | No |
| Obsidian sync | Yes | No | No |
| Voice capture | Yes (Whisper) | No | No |
| RSS auto-capture | Yes | No | No |
| Offline queue | Yes | No | No |
| Self-host option | Yes (Docker) | No | No |
| Mobile capture | Via web app | iOS/Android share sheet | No |
| Free tier | 10MB, 120 MCP/hr | 100 captures | Limited |
Which one should you use?
Choose TabStash if: You want a fast, simple bookmark manager with AI search. You do not need full text extraction, MCP integration, or local AI. You just want to save links and find them later.
Choose AltShift+ if: You want AI summaries and OCR with mobile capture via share sheet. You are okay with cloud-only processing. Collections and visual previews are important to your workflow.
Choose Glassy Companion if: You want structured capture that preserves full article text, not just URLs. You want local AI tagging without cloud dependency. You want to query your captures from Claude, Cursor, Windsurf, OpenCode, Hermes, Openclaw, Pi, or any MCP-compatible AI agent via MCP. You want Obsidian sync, voice capture, and RSS auto-capture in the same corpus. You want a self-host option for sensitive content.
The difference is depth. TabStash and AltShift+ are bookmark managers. Glassy Companion is the capture layer of a knowledge base.