# Four Formula Calculator vs Formula Calculator #

The clearest difference is in-app purchases: Four Formula Calculator at none against Formula Calculator #'s 4. On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Formula Calculator # sells 4 one-off in-app purchases. Four Formula Calculator asks for nothing beyond the download.

Four Formula Calculator ships an update every 2 months, Formula Calculator # every 5 weeks. The most recent releases landed on October 26, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | Four Formula Calculator | Formula Calculator # |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (2 ratings)](https://appshunter.io/ios/app/formula-calculator/id6504839903/reviews)** |
| Number of ratings | — | **2** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | Yes | Yes |
| Update frequency | Every 2 months | **Every 5 weeks** |
| Monetization | — | Free with in-app purchases |
| Size | 4 MB | 67 MB |
| Requires iOS | 12.0 | 12.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [SHIGETO TAKAGI](https://appshunter.io/developer/519611619) | [威 刘](https://appshunter.io/developer/1465235012) |

## What reviewers say

### Four Formula Calculator

[App page](https://appshunter.io/ios/app/four-formula-calculator/id523405542)

**In-app purchases:** none


### Formula Calculator #

[App page](https://appshunter.io/ios/app/formula-calculator/id6504839903)

Perform calculations with a vast library of built-in formulas or create your own. Save and sync custom formulas to the cloud for easy access across devices. Includes a comprehensive scientific calculator.

**Highlights:** Extensive built-in calculation formulas, Create and save custom formulas, Cloud synchronization for custom formulas, Share custom formulas with others, Comprehensive scientific calculator

**Features:** macOS Compatibility

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1 month subscription | $1.49 | one-time |
| 3 months subscription | $2.49 | one-time |
| 6 months subscription | $3.49 | one-time |
| 1 year subscription | $4.49 | one-time |


## Frequently asked questions

### Is Four Formula Calculator free?

Four Formula Calculator is free to download, with no in-app purchases.

### Is Formula Calculator # free?

Formula Calculator # is free to download, with in-app purchases available.

### Do Four Formula Calculator or Formula Calculator # have ads?

Both Four Formula Calculator and Formula Calculator # show ads.

### Which is updated more often, Four Formula Calculator or Formula Calculator #?

Four Formula Calculator ships an update every 2 months, and Formula Calculator # every 5 weeks. Most recently, Four Formula Calculator was updated on October 26, 2026 and Formula Calculator # on November 4, 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.*