# Burn 451 (burn451.cloud)

> Free bookmark manager — every bookmark gets 24 hours. Read it or let it burn. Expose your knowledge to AI agents via MCP.

## What is Burn

Burn gives every bookmark a 24-hour countdown. Read it and it becomes a Spark (saved 30 days). Ignore it and it turns to Ash. What survives goes to your permanent Vault. Connect your Vault to AI agents via the MCP server — your bookmarks become a searchable knowledge API.

## Core Concepts

- **Flame**: New bookmarks with a 24h timer. Read or let burn.
- **Spark**: Bookmarks you read. Saved for 30 days.
- **Vault**: Permanent collection. Your curated knowledge.
- **Ash**: Expired bookmarks. They had their chance.
- **Collection**: Topic bundles you create manually. AI overview included.

## Platforms

- iOS App: https://apps.apple.com/us/app/burn451/id6759418544
- Web App (PWA): https://burn451.cloud
- Chrome Extension: Bookmark Autopsy — scan and manage browser bookmarks
- MCP Server: `npx burn-mcp-server` (npm: https://www.npmjs.com/package/burn-mcp-server)

## MCP Server

The MCP server exposes 22 tools for AI agents (Claude, Cursor, Windsurf):

- Search vault, sparks, flame, and ash
- Move bookmarks between lifecycle stages
- Create and manage topic collections
- Write analysis back to bookmarks
- Get reading stats and patterns

Install: `npx burn-mcp-server`
Protocol: Model Context Protocol (MCP)
Rate limit: 30 calls/min
Cost: Free

## API

- Content extraction: /api/jina-extract
- Metadata parsing: /api/parse-meta (supports WeChat, Xiaohongshu, HN, Reddit)
- X/Twitter parsing: /api/parse-x
- Bookmark analysis: /api/analyze-bookmarks

## Key Data

- Average user never reopens 94% of saved bookmarks
- Only 4.7% of bookmarks are revisited after saving
- By day 9, revisit rate drops to 0.3%

## Links

- Website: https://burn451.cloud
- Bookmark Scanner (free tool): https://burn451.cloud/scan
- MCP Server: https://www.npmjs.com/package/burn-mcp-server
- Chrome Extension: Chrome Web Store (search "Bookmark Autopsy")