SigmaNote vs Bubbly Thoughts
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
SigmaNote
This app acts as an AI-powered knowledge hub, allowing users to capture, manage, learn from, and create knowledge across various formats. It uses AI agents to organize content, answer questions, and facilitate voice-driven writing and content creation.
- 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
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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
Bubbly Thoughts
This app allows you to speak your thoughts, which are then automatically organized into distinct, named items. It can parse lists, recognize dates, and answer questions based on what you've said, all while keeping your data private on your device.
- Speech-to-text organization
- Automatic thought categorization
- List parsing
- Date recognition
- Private data storage
- Searchable thought history
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Speak your mind. Bubbly sorts it. Say everything at once. The errands, the dates, the half-formed worry, the question you keep meaning to look up. Bubbly breaks it into separate thoughts, names each one, and files them where they belong. Everything happens on your iPhone. Your words are never sent anywhere to be read, summarised, or trained on. • Speak once, get many. One rambling paragraph becomes separate bubbles. • Lists stay lists. Say five things to buy and they arrive as five items. • Ask your own thoughts. "Did I ever pay the dentist?" Answered from what you actually said. • Dates that hold up: "every Tuesday", "before the 30th", "moved to Friday". • Nothing is capped. Nothing is filed by hand.
Screenshots
Verdict
The clearest difference is update cadence: Bubbly Thoughts at every 3 days against SigmaNote's weekly. Bubbly Thoughts also leads on ratings volume (6 vs 1) and iOS requirement (15.1 vs 18.0). On price, rating, ads and in-app purchases there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. SigmaNote sells 4 in-app purchases, starting at $8.99 per month and Bubbly Thoughts sells 1 in-app purchase, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.
On the App Store both sit at effectively the same score — 5.0 for SigmaNote against 5.0 for Bubbly Thoughts. That said, the two scores are not equally well evidenced: Bubbly Thoughts has 6 ratings behind it against 1, so its average is the more settled of the two.
SigmaNote ships an update weekly, Bubbly Thoughts every 3 days. The most recent releases landed on November 5, 2026 and October 31, 2026 respectively.
| Parameter | SigmaNote | Bubbly Thoughts |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) | 5.0 (6 ratings) |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | 1 | 6 — better |
| Update frequency | Weekly | Every 3 days — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Freemium | Free with in-app purchases |
| Devices | iPhone, iPad | iPhone, iPod |
| Requires iOS | 18.0 | 15.1 — better |
| Further details — not scored | ||
| Size | 90 MB | 49 MB |
| Age rating | 4+ | 12+ |
| Developer | SignifyID LLC | Yehuda Green |
Customer experience
SigmaNote
Bubbly Thoughts
In-app purchases
SigmaNote
- SigmaNote Premium Monthly$8.991 Month
- SigmaNote Premium Plus Monthly$12.991 Month
- SigmaNote Premium Yearly$80.991 Year
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- SigmaNote Premium Plus Yearly$116.991 Year
Bubbly Thoughts
- Bubbly+$4.991 Month
Questions
Is SigmaNote free?
Is Bubbly Thoughts free?
Which has better reviews, SigmaNote or Bubbly Thoughts?
Do SigmaNote or Bubbly Thoughts have ads?
Which is updated more often, SigmaNote or Bubbly Thoughts?
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