Comparison

Decision IO vs SigmaNote

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Decision IO

Features
Read full description

Make smarter choices with Decision IO. Whether you're facing big life choices or everyday decisions, Decision IO helps you make confident and intentional choices that align with your goals. DOCUMENT FOR CLARITY Write out your decisions and set your choices for a clear overview. Add pros and cons lists for each choice so you can see all perspectives and never miss anything important. TRACK AND ANALYZE Rate decision outcomes and visualize your decision-making patterns with 90-day trend insights. Learn from past decision-data to see where you can improve. COACH IO GUIDANCE Get personalized advice from the AI-powered Coach IO that analyzes your options against your prioritized goals to recommend your best choice to you. COLLABORATE WITH FRIENDS Share your decisions with friends and family to get their input when you need additional perspectives or make joint decisions on what you need together. PRO ACCESS - Subscribe to Pro Access for unlimited decisions and choices - With access to Coach IO for personalized AI guidance - Subscriptions are billed automatically at the rate selected in your subscription plan Download Decision IO today and start making better decisions that align with the best you. Terms of Use (EULA) can be found at: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

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.

Highlights
  • 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
Features
Read full description

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

Screenshots

Decision IO4 screens
SigmaNote4 screens

Verdict

The call

The clearest difference is update cadence: SigmaNote at weekly against Decision IO's monthly. Decision IO's advantage is iOS requirement (14.0.0 vs 18.0). On price, ads, in-app purchases and device support 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Decision IO sells 2 in-app purchases, starting at $7.99 per month and SigmaNote sells 4 in-app purchases, starting at $8.99 per month. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Decision IO ships an update monthly, SigmaNote weekly. The most recent releases landed on September 9, 2026 and June 1, 2026 respectively.

Scorecard2 real differences · 7 level
Decision IO versus SigmaNote: the parameters behind the verdict, then further details
ParameterDecision IOSigmaNote
PriceFreeFree
Rating—5.0 (1 ratings) — better
Number of ratings—1 — better
Update frequencyMonthlyWeekly — better
AdsNoNo
In-app purchasesYesYes
Monetization—Freemium
DevicesiPhone, iPodiPhone, iPad
Requires iOS14.0.0 — better18.0
Further details — not scored
Size48 MB90 MB
Age rating4+4+
DeveloperAltius Opes LLCSignifyID LLC

In-app purchases

2 purchases

Decision IO

Subscriptions2
  • Pro Access - Monthly$7.991 Month
  • Pro Access - Yearly$59.991 Year
4 purchases

SigmaNote

Subscriptions4
  • SigmaNote Premium Monthly$8.991 Month
  • SigmaNote Premium Plus Monthly$12.991 Month
  • SigmaNote Premium Yearly$80.991 Year
Show 1 more
  • SigmaNote Premium Plus Yearly$116.991 Year

Questions

Is Decision IO free?
Decision IO is free to download, with in-app purchases available.
Is SigmaNote free?
SigmaNote is free to download, with in-app purchases available.
Do Decision IO or SigmaNote have ads?
Neither Decision IO nor SigmaNote shows ads.
Which is updated more often, Decision IO or SigmaNote?
Decision IO ships an update monthly, and SigmaNote weekly. Most recently, Decision IO was updated on September 9, 2026 and SigmaNote on June 1, 2026.

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