# cFormula vs CalcNotes

The clearest difference is ads: CalcNotes at none against cFormula's shown. CalcNotes also leads on update cadence (weekly vs every 5 months). cFormula's advantage is iOS requirement (13.0 vs 15.1). On price, in-app purchases and device support there is nothing between them.

Both are free to download. cFormula sells 1 one-off in-app purchase and CalcNotes sells 2 in-app purchases, starting at $1.99 per month. Whichever you choose, the download price is not the number that matters.

cFormula ships an update every 5 months, CalcNotes weekly. The most recent releases landed on October 10, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | cFormula | CalcNotes |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 5 months | **Weekly** |
| Size | 13 MB | 51 MB |
| Requires iOS | **13.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [疆 边](https://appshunter.io/developer/1124320934) | [naoki otsu](https://appshunter.io/developer/1082476153) |

## What reviewers say

### cFormula

[App page](https://appshunter.io/ios/app/cformula/id6475750528)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Fully unlock app | $1.99 | one-time |


### CalcNotes

[App page](https://appshunter.io/ios/app/calcnotes-calculation-memo/id6752585573)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium | $1.99 | per month |
| Premium (Pay Once) | $4.99 | one-time |


## Frequently asked questions

### Is cFormula free?

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

### Is CalcNotes free?

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

### Do cFormula or CalcNotes have ads?

cFormula shows ads; CalcNotes does not.

### Which is updated more often, cFormula or CalcNotes?

cFormula ships an update every 5 months, and CalcNotes weekly. Most recently, cFormula was updated on October 10, 2026 and CalcNotes on October 14, 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.*