Burn 451 vs Readspace

Burn 451 is a read-later app that puts saved links on a schedule and turns retained items into a searchable knowledge base. A link begins in Flame for 24 hours; opening it moves it to Spark for 30 days, and users can move it to Vault for permanent retention. The free tier permits five Flame saves per day, 30 Spark items, 100 Vault items and 30 MCP requests per day. Pro costs $4.99 a month and removes limits on Spark items, Vault items and MCP requests. Pro also includes AI summaries and decision cards, voice notes, YouTube transcripts, automatic Vault tagging, full-text search and Markdown export. A 26-tool MCP server can search saved content and manage the queue in Claude, Cursor and Windsurf; the service also offers a REST API. Users can save links through the web app, Chrome extension, iOS share sheet or Safari extension for Mac. The maker describes Burn 451 as a personal tool for triaging unread links rather than maintaining an enduring bookmark archive. The Web Clipper requires a free account to sync saves across devices.

Readspace brings followed publications, writers, and newsletters into a reading feed and creates a five-minute daily briefing. The chronological feed contains sources a user follows, without engagement ranking or suggested posts. Its Daily Digest groups coverage of the same development across selected sources and links to them. Readers can explore more than 120,000 sources and import or export subscriptions as OPML. A browser extension can find a site's RSS feed when available. Reading tools include summaries, key-point highlighting, and translation. Newsletters can be received through a private Readspace email alias and placed in a Newsletters folder. The maker says reading has no ads or trackers and that reading activity is not sold or used for targeting. Readspace is open source and can be self-hosted; that option has no usage limits, but lacks the hosted catalog, requires OPML imports, and bills AI through the user's provider. Basic is free with limits on feeds, saved articles, and daily tools. Pro costs $5.99 a month, billed monthly, with fair-use limits.