# Sigma Notepad Calculator — Math in words: units, currency

> Math in words: units, currency (iPhone/iPad app by Soules Studio Ltd.)

- Source: https://appshunter.io/ios/app/sigma-notepad-calculator/id6768903761 (this page in markdown: same URL + `.md`)
- Developer: [Soules Studio Ltd](https://appshunter.io/developer/1883253392)
- Category: Productivity, Utilities
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 17.0 · 15 MB
- Languages: American English, French (France)
- Released: 2026-05-26
- Data updated: 2026-07-25
- User reviews in markdown: https://appshunter.io/ios/app/sigma-notepad-calculator/id6768903761/reviews.md

## What is Sigma Notepad Calculator?

Type your math. Sigma calculates as you write. A notepad where every line is a working calculation.

Type "rent 1200, food 380, transport 95" and Sigma adds them. Write "20% of 240" and the answer appears beside the line. Name a value, reference it three lines down, and every dependent answer updates when you change the source.

Free forever for everyday use: three sheets, full calculator, no ads. Upgrade to Sigma Pro yearly, monthly, or once-for-life when you need unlimited sheets, export, and iCloud sync.

Highlights:
- Natural language arithmetic. Operators read like English. Percentages, totals, averages, and units all work the way you write them.
- Named variables. Declare once, reference everywhere. Changes propagate.
- Currency. Live rates with offline cache. Tap a line to see when rates were last fetched.
- Themes. Six themes including a high-contrast option. The default follows your system light and dark; five more unlock with Sigma Pro.
- Sheets. Up to three sheets on the free tier. Sigma Pro unlocks unlimited sheets, export to PDF, Markdown, and plain text, plus iCloud sync across your devices.
- Private by default. Sheets stay on your device. iCloud sync uses your private database, never our servers.
- Designed for iOS first. Reads French and English natively. No web app, no ads, no surprise pop-ups.

Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Privacy Policy: https://getsigma.app/privacy

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| Monthly | $1.99 | per month |
| Annual | $14.99 | per year |

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Lifetime | $29.99 | one-time |



## Version history (last 2 releases)

### 1.1.0 — 2026-07-02

New: checkboxes. Start a line with [ ] to add a checkable item, tap to mark it done, unchecked items skip your totals automatically. Plus a faster, hands on onboarding that gets you calculating right away.

### 1.0.0 — 2026-05-26

No release notes.

## More apps by Soules Studio Ltd

- [Ayyam: Islamic calendar](https://appshunter.io/ios/app/ayyam-islamic-calendar/id6760212193)

All apps by Soules Studio Ltd: https://appshunter.io/developer/1883253392

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-07-25.*