# SimpleSigma vs Voice Diary

The clearest difference is ads: Voice Diary at none against SimpleSigma's shown. Voice Diary also leads on iOS requirement (15.6 vs 26.0). On price, update cadence, in-app purchases and device support there is nothing between them.

Both are free to download. SimpleSigma sells 2 in-app purchases, starting at $2.99 per month and Voice Diary sells 3 in-app purchases, starting at $1.99 per month. Whichever you choose, the download price is not the number that matters.

SimpleSigma ships an update every 6 weeks, Voice Diary monthly. The most recent releases landed on October 7, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | SimpleSigma | Voice Diary |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 66.7% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 6 weeks | **Monthly** |
| Monetization | Free with in-app purchases | — |
| Size | 7 MB | 58 MB |
| Requires iOS | 26.0 | **15.6** |
| Devices | iPhone, Apple Watch | **iPhone, iPad, iPod** |
| Age rating | 4+ | 9+ |
| Developer | [MUTSUAKI KIKUCHI](https://appshunter.io/developer/1874283283) | [Arseni Hlaz](https://appshunter.io/developer/6774904084) |

## What reviewers say

### SimpleSigma

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

This app offers a versatile calculator with three distinct table types for various needs, from simple sums to complex quantity-based calculations. It features intuitive input, auto-saving, and CSV export. An optional Pro version removes ads, unlocks unlimited tables, and adds advanced statistics and OCR receipt scanning.

**Highlights:** Three distinct table types (Simple, Duplex, Shopping), Auto-totaling and quick sum calculations, Swipe keyboard for cell navigation, CSV data export, Auto-save functionality, Optional Pro version with advanced features

**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 |


### Voice Diary

[App page](https://appshunter.io/ios/app/voice-diary-ai-journal/id6774904082)

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly (1 month) | $1.99 | per month |
| Annual (12 months) | $12.99 | per year |
| Lifetime (Forever) | $69.99 | one-time |


## Frequently asked questions

### Is SimpleSigma free?

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

### Is Voice Diary free?

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

### Do SimpleSigma or Voice Diary have ads?

SimpleSigma shows ads; Voice Diary does not.

### Which is updated more often, SimpleSigma or Voice Diary?

SimpleSigma ships an update every 6 weeks, and Voice Diary monthly. Most recently, SimpleSigma was updated on October 7, 2026 and Voice Diary on October 25, 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.*