Burn 451 vs Cubox

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.

Cubox is an AI read-it-later app for saving and organizing material to read across devices. It supports offline access, full-text search, highlighting, and highlight export. Users can start for free, while Cubox Pro costs $29 a year and includes unlimited saves and highlights, webpage parsing and snapshots, multiple highlight colors, customizable reading style, nested folders and tags, Email Drop, and API access. Cubox Pro+AI costs $49 a year and adds an AI reading assistant, AI insights with summaries and points, and AI ghost highlights; this plan includes a 14-day free trial that can be canceled any time. Native apps are listed for Mac, iPhone and iPad, Android, and E-Ink, along with extensions for Chrome, Edge, Firefox, and Safari. The service lists more than ten saving extensions. Paid subscriptions are available across platforms without a login limitation. Cubox says it is ad-free, does not sell or use personal data, and keeps data after membership expires. Users can export links and annotations at any time.