Burn 451

Overview

Burn 451 is a read-later app organized around a short-lived queue and a permanent collection for links worth keeping. It fits readers who want to decide what deserves attention and retention, rather than collect every link as a bookmark. The trade-off is deliberate: links move through timed stages, and the free tier places firm limits on daily saving and storage.

Key features

Each saved link starts in Flame for 24 hours. Opening it moves it to Spark for 30 days; moving it to Vault keeps it permanently. This makes the queue feel purposeful, but it also calls for active curation: links left unopened have a short window, and Free users have only 30 Spark slots and 100 Vault slots.

Burn 451 accepts saves through its web app, Chrome extension, iOS share sheet and Safari extension for Mac. The Web Clipper requires a free account so links can sync across devices. Browser and mobile options make capture possible across common reading contexts, while the account requirement may not suit someone seeking a no-account clipper.

Pro adds AI summaries and decision cards, voice notes, YouTube transcripts, automatic Vault tagging, full-text search and Markdown export. Together, these features make retained links more useful as a searchable reference collection; readers who only need a basic queue may not need the paid toolkit. Its 26-tool MCP server works with Claude, Cursor and Windsurf to search saved content and manage the reading queue, and a REST API is also available. MCP tokens are scoped to user data with row-level security, capped at 30 calls per minute and expire after 30 days. The MCP server is open source under the MIT license.

Pricing

Free costs nothing, requires no card and is available indefinitely. It allows 5 Flame saves per day, 30 Spark items, 100 Vault items and 30 MCP requests per day. That is a usable starting point for selective readers, but the daily save allowance and collection caps can constrain anyone building a larger archive or regularly using MCP.

Pro costs $4.99 a month, billed monthly, and includes unlimited Spark items, unlimited Vault items and unlimited MCP requests. It removes the free tier’s storage and MCP ceilings, making it the practical choice for heavier use. The AI features are part of Pro.

Platforms

Burn 451 supports API, browser extension, iOS, macOS and web. Android is not among its supported platforms, so readers who need an Android app should consider another option.

Who it's for

Choose Burn 451 if you want a disciplined read-later workflow that separates links to review soon from items worth retaining, especially if you value AI-assisted search or integrations with developer tools. It is less suitable for people who want a large, permanent bookmark archive without quotas, or who need Android support.

Pros and cons

• Pros: Timed Flame and Spark stages give unread links a clear review window, while Vault provides a permanent home for selected items.
• Pros: Pro combines AI features with MCP and API access, making the retained collection useful beyond ordinary browsing.
• Cons: Free is capped at five daily saves, 30 Spark items, 100 Vault items and 30 daily MCP requests, limiting sustained or high-volume use.
• Cons: Links left in Flame have only 24 hours before their initial window closes, which may not suit an irregular reading routine.
• Cons: Android is not supported.

Alternatives

Read-It-Later Apps is the broader category directory for comparing options. Pick wallabag if you want a free read-later option with Android, Linux and self-hosted support. Omnivore is worth considering if you can deploy your own server: its cloud application was deprecated in November 2024. Choose PaperSpan if offline mobile reading, highlights or sending one article at a time to Kindle matters more. Reminde offers a free plan with one slot and unlimited savings, a different fit for readers who prefer a slot-based limit.

Couch is an iOS and macOS option with unlimited saves and basic features on its free plan. Gistory may suit readers seeking unlimited article saves and a free allowance of 10 AI summaries per month. Matter is limited to iOS and web and offers an unlimited free library. Readspace is another alternative.

Verdict

Burn 451 is a strong choice for selective readers who want deadlines for unread links and a searchable, AI-enabled collection for what they keep. Its clearest reason to choose it is the combination of staged triage, Vault retention and developer integrations. Look elsewhere if you need Android, exceed five free saves a day, or want Spark, Vault and MCP without the free tier’s caps; Pro is $4.99 a month.