# 1Calc vs Sigma Notepad Calculator

The clearest difference is ads: Sigma Notepad Calculator at none against 1Calc's shown. On price, update cadence, in-app purchases and device support there is nothing between them.

Both are free to download. 1Calc sells 3 in-app purchases, starting at $0.99 per month and Sigma Notepad Calculator sells 3 in-app purchases, starting at $1.99 per month. Whichever you choose, the download price is not the number that matters.

Both ship on a similar rhythm, roughly fortnightly. The most recent releases landed on October 24, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | 1Calc | Sigma Notepad Calculator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[2.0 (1 ratings)](https://appshunter.io/ios/app/1calc-one-calculator/id6502853473/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Fortnightly | Fortnightly |
| Size | 6 MB | 16 MB |
| Requires iOS | 18.0 | **17.0** |
| Devices | iPhone | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Asim Roy](https://appshunter.io/developer/1703408134) | [Soules Studio Ltd](https://appshunter.io/developer/1883253392) |

## What reviewers say

### 1Calc

[App page](https://appshunter.io/ios/app/1calc-one-calculator/id6502853473)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $0.99 | per month |
| Yearly | $3.99 | per year |
| Lifetime | $8.99 | one-time |


### Sigma Notepad Calculator

[App page](https://appshunter.io/ios/app/sigma-notepad-calculator/id6768903761)

**Features:** Family Sharing

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $1.99 | per month |
| Annual | $14.99 | per year |
| Lifetime | $29.99 | one-time |


## Frequently asked questions

### Is 1Calc free?

1Calc is free to download, with in-app purchases available.

### Is Sigma Notepad Calculator free?

Sigma Notepad Calculator is free to download, with in-app purchases available.

### Do 1Calc or Sigma Notepad Calculator have ads?

1Calc shows ads; Sigma Notepad Calculator does not.

### Which is updated more often, 1Calc or Sigma Notepad Calculator?

1Calc ships an update fortnightly, and Sigma Notepad Calculator fortnightly. Most recently, 1Calc was updated on October 24, 2026 and Sigma Notepad Calculator 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.*