# SigmaNote vs Eidra

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.

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.

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.

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

## The numbers

| Metric | SigmaNote | Eidra |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/sigmanote/id6744374542/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/eidra/id6763976011/reviews) |
| Number of ratings | 1 | 1 |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Weekly** | Every 3 weeks |
| Monetization | Freemium | Freemium |
| Size | 90 MB | 44 MB |
| Requires iOS | 18.0 | **15.1** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [SignifyID LLC](https://appshunter.io/developer/1793292360) | [Mikel Whiting](https://appshunter.io/developer/1867326970) |

## What reviewers say

### SigmaNote

[App page](https://appshunter.io/ios/app/sigmanote/id6744374542)

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:** macOS Compatibility, Family Sharing

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| SigmaNote Premium Monthly | $8.99 | per month |
| SigmaNote Premium Plus Monthly | $12.99 | per month |
| SigmaNote Premium Yearly | $80.99 | per year |
| SigmaNote Premium Plus Yearly | $116.99 | per year |


### Eidra

[App page](https://appshunter.io/ios/app/eidra/id6763976011)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Eidra Casual | $2.99 | per month |
| Eidra Business | $4.99 | per month |


## Frequently asked 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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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*