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Ultrathink is a personal, private knowledge base built for knowledge workers. Its goal is to help you quickly capture information from webpages, notes, files, audio, screenshots, AI conversations, and more, then use AI-powered summarization, classification, linking, and natural-language search to improve recall and organization. It is closer to a personal knowledge management and research workspace than a full enterprise knowledge base.
The product’s strengths lie in its capture options and AI processing pipeline. Users can capture content through a Chromium browser extension, an Electron desktop widget, the Web App, and iOS Web/PWA. It supports 20+ content types, including ChatGPT, Claude, and Perplexity conversations, PDF/Office files, Notion pages, Outlook emails, YouTube/Vimeo, images, screenshots, and audio. For organization, it offers Grid, Kanban, Work Plan canvas, and AI Canvas views, making it suitable for workflows ranging from collecting materials and managing tasks to research and writing. Its AI can automatically summarize content, classify items as Project/Task/Knowledge, extract topics and people, identify relationships between entries, and support natural-language search.
Pricing is relatively straightforward: Free costs £0/month and includes unlimited entries, the browser extension, desktop widget, built-in OpenAI API Key, basic filters, and views. Pro costs £9.99/month or £99.99/year and includes AI summaries, 10,000 AI calls per month, priority email support, advanced filtering, and a trial. Current integrations focus more on “capture and recognition,” with OpenAI serving as the core AI layer. GitHub, Notion, Fastmail, and Asana are still planned integrations, so they should not yet be treated as mature connectors.
The advantages are a low-friction free plan, broad content-type support, automatic saving, and a fairly complete AI metadata workflow. Navigation, entities, content types, views, and prompts are also customizable. The downsides are that native mobile apps have not yet launched, while team collaboration is only mentioned in scattered references to sharing and org-shared entries. Permissions, audit logs, SSO, compliance certifications, SLA, and self-hosting have not been disclosed, so it should not be positioned directly as an enterprise-grade knowledge management platform.
Ultrathink is well suited to individual researchers, project managers, consultants, product managers, operations teams, and others who need to preserve large amounts of fragmented information. It is also a good fit for heavy users of AI chat tools who want to archive and retrieve past conversations. The available text does not specify access conditions from mainland China; however, because the product depends on services such as OpenAI and Firebase, AI features and overall stability may be affected by local network and payment conditions. If local collaboration and stable access are priorities, alternatives such as 飞书知识库, 语雀, Notion, Obsidian, and OneNote may be worth comparing.
⚠ This review is compiled from public sources and does not constitute a purchase recommendation. Verify all facts on the vendor's official site. Verify on tryultrathink.com official site.
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