Description
SigmaNote is an AI-powered second-brain app that helps you capture, organize, and use knowledge from any source. You can import PDFs, EPUBs, Word, Excel, and PowerPoint files, capture web pages, extract YouTube video transcripts, and record voice notes with real-time transcription, all into one hub. AI agents grounded in your data then help you learn by conversation and turn what you capture into output.
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Instead of just reading, you chat with your knowledge: ask any question and the AI finds answers grounded in your data, even across multiple sources, with natural-language search that needs no keywords. You can turn any file or note into an audio experience, pause anytime to ask questions, read EPUBs and PDFs while chatting with the text, and co-create summaries, articles, and reports with AI. Content is organized in a flexible, visual knowledge tree.
SigmaNote is designed for students, researchers, founders, consultants, lawyers, clinicians, and creators, anyone who works with large amounts of documents and wants AI help extracting insights. It syncs across iPhone, iPad, Mac, and web, so your second brain is always with you. Notes are stored with end-to-end encryption, sync traffic is protected with TLS 1.3, and your content is never used for model training.
SigmaNote offers a free Starter tier (5 captures per day, 5 AI chats per day, up to 5MB per file) with full access to all features, plus Premium monthly and yearly plans that add unlimited imports and prompts, 15GB of cloud storage, and a premium AI model.
- CategoryAI Knowledge Management
- Pricing ModelFreemium
- DeploymentCloud
- PlatformsWeb, iOS, macOS
SigmaNote's Core Features
One hub for PDFs, EPUBs, Office files, web pages, and YouTube videos
AI chat grounded in your knowledge base across multiple sources
Voice recording with real-time transcription
Listen to files and notes as audio, then ask questions
Natural-language search with no keywords required
AI-powered note creation and knowledge into output
Cross-platform sync across iOS, Mac, and web
End-to-end encrypted storage, never used for training
How to use SigmaNote?
Capture anything: Import PDFs, Office files, EPUBs, YouTube links, web pages, and voice notes.
Organize: Group content in a flexible, visual knowledge tree.
Chat with your knowledge: Ask questions and get answers grounded in your own data.
Create: Use AI to summarize, write, and expand your ideas into deliverables.
Sync: Continue on any device with iPhone, iPad, Mac, and web sync.
SigmaNote's Use Cases
- Research organization
- Document-heavy professional work
- Content research
- Lecture and meeting capture
- Turning knowledge into deliverables
