# SimpleSigma vs noteSUM

The clearest difference is iOS requirement: noteSUM at 14.0 against SimpleSigma's 26.0. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. SimpleSigma sells 2 in-app purchases, starting at $2.99 per month and noteSUM sells 3 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

SimpleSigma ships an update every 6 weeks, noteSUM monthly. The most recent releases landed on September 11, 2026 and September 8, 2026 respectively.

## The numbers

| Metric | SimpleSigma | noteSUM |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | Yes | Yes |
| Update frequency | Every 6 weeks | **Monthly** |
| Size | 7 MB | 7 MB |
| Requires iOS | 26.0 | **14.0** |
| Devices | iPhone, Apple Watch | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [MUTSUAKI KIKUCHI](https://appshunter.io/developer/1874283283) | [Kazuhiro Sawamura](https://appshunter.io/developer/620439638) |

## What reviewers say

### SimpleSigma

[App page](https://appshunter.io/ios/app/simplesigma/id1522264347)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| SimpleSigma Pro (Monthly) | $2.99 | per month |
| SimpleSigma Pro (Yearly) | $29.99 | per year |


### noteSUM

[App page](https://appshunter.io/ios/app/notesum/id1553539735)

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Number of History records | $0.99 | one-time |
| Number of Favorites | $0.99 | one-time |
| Hide Ads | $2.99 | one-time |


## Frequently asked questions

### Is SimpleSigma free?

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

### Is noteSUM free?

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

### Do SimpleSigma or noteSUM have ads?

Both SimpleSigma and noteSUM show ads.

### Which is updated more often, SimpleSigma or noteSUM?

SimpleSigma ships an update every 6 weeks, and noteSUM monthly. Most recently, SimpleSigma was updated on September 11, 2026 and noteSUM on September 8, 2026.

---

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