# Decision IO vs SigmaNote

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.

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.

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

## The numbers

| Metric | Decision IO | SigmaNote |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/sigmanote/id6744374542/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Weekly** |
| Monetization | — | Freemium |
| Size | 48 MB | 90 MB |
| Requires iOS | **14.0.0** | 18.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Altius Opes LLC](https://appshunter.io/developer/1792062188) | [SignifyID LLC](https://appshunter.io/developer/1793292360) |

## What reviewers say

### Decision IO

[App page](https://appshunter.io/ios/app/decision-io/id6740878575)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Access - Monthly | $7.99 | per month |
| Pro Access - Yearly | $59.99 | per year |


### 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 |


## Frequently asked 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.

---

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