# SigmaNote — Build your AI knowledge base > AI-powered knowledge hub for capturing, learning, and creating with your information. (iPhone/iPad app by SignifyID LLC.) - Source: https://appshunter.io/ios/app/sigmanote/id6744374542 (this page in markdown: same URL + `.md`) - Developer: [SignifyID LLC](https://appshunter.io/developer/1793292360) - Category: Productivity, Education - Price: Free with in-app purchases - Rating: 5.00/5 from 1 App Store ratings - Age rating: 4+ - Requires: iOS 18.0 · 90 MB - Languages: American English - Released: 2025-05-09 - Data updated: 2026-06-01 - Monetization: freemium - User reviews in markdown: https://appshunter.io/ios/app/sigmanote/id6744374542/reviews.md ## What is SigmaNote? SigmaNote — AI-Powered Knowledge Hub SigmaNote lets you build your own AI-powered knowledge hub — a single place to capture, manage, learn from, and create knowledge. It goes beyond notes or chat. SigmaNote gives you AI agents that work with your knowledge, across every format. Capture Knowledge from Anywhere Bring knowledge into SigmaNote from any source: • Notes and markdown documents • PDFs, files, and document scans • Images with OCR • Web pages and web archives • YouTube videos (with or without subtitles) • Voice recordings and system audio • Real-time, multi-language transcripts No format limits. Everything becomes searchable and usable. AI Agents That Organize for You SigmaNote’s AI agents help you: • Find relevant knowledge instantly • Organize content into the right Spaces • Connect related ideas across files and formats • Reduce clutter as your knowledge grows Your knowledge hub stays structured — without manual effort. Learn by Listening, Reading, and Conversation Knowledge shouldn’t just sit there. With SigmaNote, AI agents can: • Proactively read or speak knowledge to you • Explain complex topics in simple terms • Answer questions grounded in your materials • Help you think through ideas step by step It’s like discussing your knowledge with a personal tutor or teammate. Talk to Write. Build New Knowledge. SigmaNote introduces voice-driven AI writing. You can talk to an AI agent to: • Write new documents • Edit and update markdown files • Refine ideas through conversation • Create knowledge using your entire hub or a selected document This turns thinking out loud into structured writing — powered by everything you’ve learned. From Capture to Creation SigmaNote supports the full knowledge lifecycle: • Capture information • Understand it with AI • Absorb it through reading and listening • Create new knowledge by talking and writing All in one personal system. Who It’s For Students, researchers, founders, consultants, lawyers, clinicians, creators — anyone who wants to own their knowledge and build with it. Why SigmaNote • One hub for all knowledge formats • AI agents grounded in your data • Learn by conversation, not just reading • Turn knowledge into output Legal Term of services & privacy policy: https://www.signifyid.com/terms/view.html?doc=privacy_policy https://www.signifyid.com/terms/view.html?doc=term_of_service ## Key features - Capture knowledge from diverse sources - AI agents for organization and retrieval - Learn through conversation and listening - Voice-driven AI writing and content creation - Unified knowledge lifecycle management - Cross-format knowledge integration ## Pricing and in-app purchases Base price: Free. **Subscriptions** | Subscription | Price | Period | | --- | --- | --- | | SigmaNote Premium Yearly | $80.99 | per year | | SigmaNote Premium Monthly | $8.99 | per month | | SigmaNote Premium Plus Monthly | $12.99 | per month | | SigmaNote Premium Plus Yearly | $116.99 | per year | ## Frequently asked questions about SigmaNote ### What kind of content can SigmaNote capture? SigmaNote can capture a wide range of content including notes, markdown documents, PDFs, scans, images with OCR, web pages, YouTube videos, voice recordings, system audio, and real-time transcripts. ### How does SigmaNote help users learn? SigmaNote's AI agents can proactively read or speak knowledge to you, explain complex topics simply, answer questions grounded in your materials, and help you think through ideas step by step, acting like a personal tutor. ### Can I create new content with SigmaNote? Yes, SigmaNote offers voice-driven AI writing. You can talk to an AI agent to write new documents, edit existing markdown files, refine ideas through conversation, and create knowledge using your entire hub or selected documents. ### What are the subscription options for SigmaNote? SigmaNote offers several premium subscription plans, including SigmaNote Premium Monthly ($8.99), SigmaNote Premium Plus Monthly ($12.99), SigmaNote Premium Yearly ($80.99), and SigmaNote Premium Plus Yearly ($116.99). ### Is SigmaNote available on multiple devices? SigmaNote is supported on iPhone and iPad, making it accessible for users on Apple's mobile and tablet platforms. ### How often is SigmaNote updated? The latest version of SigmaNote is 2.0.0, and it was last updated on January 8, 2026. This indicates a relatively frequent update cycle for the application. ### Does SigmaNote have ads? No, SigmaNote does not contain advertisements. It is an ad-free application, focusing on providing a seamless user experience. ### What is the age rating for SigmaNote? SigmaNote has an age rating of 4+, making it suitable for a wide range of users, including younger individuals and families. ## Version history (last 5 releases) ### 2.0.0 — 2026-01-08 SigmaNote has been rebuilt. Introducing an AI-powered knowledge hub — capture knowledge in any format, learn by conversation, and talk to write using your own knowledge. ### 1.1.5 — 2025-11-24 - Support webarchive file format import - Support image file formats - Support apple notification for long running conversion tasks - Bug fixes ### 1.1.4 — 2025-11-18 – New hands-free speech reader for listening to any content – Talk-to-AI mode for natural, voice-driven interaction – Listening mode now includes AI question assistance while you read – Improved search and advanced filtering for faster discovery – New PDF and EPUB reader with a built-in AI assistant – Enhanced bookmarking for articles, webpages, and documents – Stability and performance improvements across all devices ### 1.1.3 — 2025-11-07 - Support live AI question assistant in voice transcripts recording - Support text to speech for any contents - Bug fixes ### 1.1.2 — 2025-10-01 - bug fixes ## More apps by SignifyID LLC - [PatentGPT - AI patent research](https://appshunter.io/ios/app/patentgpt-ai-patent-research/id6741141699) - [Paperly: AI-powered Library](https://appshunter.io/ios/app/paperly-ai-powered-library/id6755901735) All apps by SignifyID LLC: https://appshunter.io/developer/1793292360 --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-01.*