# SigmaNote vs CRTX

The clearest difference is iOS requirement: SigmaNote at 18.0 against CRTX's 26.0. 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 CRTX sells 4 in-app purchases, starting at $7.99 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 CRTX. Both are backed by a comparable volume of ratings — 1 and 1 respectively.

## The numbers

| Metric | SigmaNote | CRTX |
| --- | --- | --- |
| 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/crtx/id6761746898/reviews) |
| Number of ratings | 1 | 1 |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Weekly | — |
| Monetization | Freemium | Free with in-app purchases |
| Size | 90 MB | 24 MB |
| Requires iOS | **18.0** | 26.0 |
| Devices | iPhone, iPad | iPhone, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [SignifyID LLC](https://appshunter.io/developer/1793292360) | [Lars Janssen](https://appshunter.io/developer/1891252260) |

## 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 |


### CRTX

[App page](https://appshunter.io/ios/app/crtx/id6761746898)

This app acts as a shared digital memory for your household, allowing you to save voice notes, photos, links, and documents. You can then ask questions in plain English to retrieve information saved by anyone in your group.

**Highlights:** Capture voice notes, photos, links, and PDFs, Search contents using natural language, Create private or shared memory pools, Assign and track tasks within shared pools, Automatic recognition of people in saved items, Apple Watch and share extension support

**Features:** macOS Compatibility, Family Sharing, Apple Watch app, Vision Pro support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| CRTX Personal Monthly | $7.99 | per month |
| CRTX Family Monthly | $12.99 | per month |
| CRTX Personal Annual | $69.99 | per year |
| CRTX Family Annual | $119.99 | per year |


## Frequently asked questions

### Is SigmaNote free?

SigmaNote is free to download, with in-app purchases available.

### Is CRTX free?

CRTX is free to download, with in-app purchases available.

### Which has better reviews, SigmaNote or CRTX?

SigmaNote and CRTX are both rated 5.0 out of 5 on the App Store, from 1 and 1 ratings respectively.

### Do SigmaNote or CRTX have ads?

Neither SigmaNote nor CRTX shows ads.

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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.*