Comparison

SigmaNote vs Eidra

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

Head to head
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

About

Eidra

Effortlessly capture and recall details about people in your life. This AI-powered memory aid extracts names, interests, and follow-ups from your spoken or typed notes, making it easy to remember important information for both personal and professional connections.

Highlights
  • AI-powered information extraction
  • Voice and text input
  • Effortless recall of names and details
  • Personal and professional use cases
  • Automatic profile updates
  • Connection linking
  • Important dates and reminders
Read full description

Eidra is a quiet memory for the people in your life. Tap once. Speak. Or type a few words. The AI listens, extracts the names, places, interests, and follow-ups, and holds them for you. Months later, when you bump into someone and your mind goes blank, you ask Eidra. The answer is already there. WHO IT'S FOR The friend you saw at a dinner party last spring (whose new partner's name you keep almost remembering). The neighbor you've waved at for two years and never quite caught the name of. The mentor you met at a conference whose advice you can never relocate when you need it. Your kid's teacher, your cousin's husband, the barista who knows your order, the new colleague who mentioned a hobby you wanted to ask about. The dating app match whose stories you want to hold onto. The mom of your daughter's classmate. Anyone you've ever wanted to remember a little better. FOR WORK, TOO Sales reps building rapport with prospects across long deal cycles. Founders tracking the people they meet at every dinner, conference, and intro coffee. Recruiters keeping context on candidates and clients. Investors holding onto the threads of every founder pitch. Anyone whose job depends on remembering people well. Eidra is a personal CRM that does not feel like a CRM. The same fast capture, the same effortless recall, just as useful for the prospect you met last quarter as the friend you saw last weekend. WHAT MAKES IT FEEL DIFFERENT Most apps make you do the work of organizing. Eidra does it the moment you speak. You say, "had drinks with Leslie, she just got back from Lisbon and is starting sourdough lessons." Eidra extracts Leslie, the trip, the new interest, and the date. It writes a one-line entry into her timeline. It updates her structured profile so the next time you ask, "what's Leslie been up to," it remembers all of it. Her card even grows with her: as you capture more, Eidra reconciles the details over time, remembers the family and pets around her, and links her to the people she's connected to. It is not a note-taking app. It is not a journal. It is a memory aid that makes the small details feel effortless to keep. WHAT YOU CAN ASK Once you've captured something, you can ask Eidra anything about anyone: • When did I last see Marcus? • What was the name of Sarah's daughter? • Who did I meet last month interested in startups? • What was that book Olivia mentioned? Eidra answers in your own words, the moment you need it. ALSO INSIDE • Important dates & reminders: a calendar of every birthday, anniversary, and follow-up, with an optional heads-up two days before so you never miss one • Connections: link people together and remember how they relate • Family & pets: Eidra quietly remembers the people (and pets) around the people you know • Briefings: a 30-second AI recap before you see someone again • Custom prompts: ask anything specific ("what should I bring up with Eli?") • Hidden contacts: lock private notes behind Face ID • Voice or text capture, your choice every time SUBSCRIPTION TIERS Eidra is free to start, with limits. Unlock more with a 7-day free trial: • Eidra Casual ($2.99/month): unlimited contacts, 20 captures/day, 5 briefings/day, custom prompt briefings • Eidra Business ($4.99/month): unlimited contacts, 40 captures/day, 10 briefings/day, custom prompt briefings, priority support Subscriptions auto-renew monthly until canceled. Manage or cancel anytime in iOS Settings, Apple ID, Subscriptions. PRIVACY Your notes stay in your account. Audio is deleted right after transcription. AI runs server-side and never trains on your data. Read the full policy at eidra-site.vercel.app/privacy. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Questions or feedback: eidra.app@gmail.com

Screenshots

SigmaNote4 screens
Eidra4 screens

Verdict

The call

The clearest difference is update cadence: SigmaNote at weekly against Eidra's every 3 weeks. Eidra's advantage is iOS requirement (15.1 vs 18.0). On price, rating, ratings volume and ads 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. SigmaNote sells 4 in-app purchases, starting at $8.99 per month and Eidra sells 2 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 5.0 for SigmaNote against 5.0 for Eidra. Both are backed by a comparable volume of ratings — 1 and 1 respectively.

UpkeepUpdate frequency

SigmaNote ships an update weekly, Eidra every 3 weeks. The most recent releases landed on October 17, 2026 and October 4, 2026 respectively.

Scorecard2 real differences · 7 level
SigmaNote versus Eidra: the parameters behind the verdict, then further details
ParameterSigmaNoteEidra
PriceFreeFree
Rating5.0 (1 ratings)5.0 (1 ratings)
Number of ratings11
Update frequencyWeekly — betterEvery 3 weeks
AdsNoNo
In-app purchasesYesYes
MonetizationFreemiumFreemium
DevicesiPhone, iPadiPhone, iPod
Requires iOS18.015.1 — better
Further details — not scored
Size90 MB44 MB
Age rating4+4+
DeveloperSignifyID LLCMikel Whiting

Customer experience

SigmaNote

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

Eidra

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

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
2 purchases

Eidra

Subscriptions2
  • Eidra Casual7 Days trial$2.991 Month
  • Eidra Business7 Days trial$4.991 Month

Questions

Is SigmaNote free?
SigmaNote is free to download, with in-app purchases available.
Is Eidra free?
Eidra is free to download, with in-app purchases available.
Which has better reviews, SigmaNote or Eidra?
SigmaNote and Eidra are both rated 5.0 out of 5 on the App Store, from 1 and 1 ratings respectively.
Do SigmaNote or Eidra have ads?
Neither SigmaNote nor Eidra shows ads.
Which is updated more often, SigmaNote or Eidra?
SigmaNote ships an update weekly, and Eidra every 3 weeks. Most recently, SigmaNote was updated on October 17, 2026 and Eidra on October 4, 2026.

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