# Formulize vs CalcFlex

Formulize and CalcFlex are too close to call on the numbers: across 3 compared parameters — price, in-app purchases and iOS requirement among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

Both are free to download. Formulize sells 1 one-off in-app purchase and CalcFlex sells 3 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

## The numbers

| Metric | Formulize | CalcFlex |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | — | No |
| Update frequency | — | Every 9 days |
| Size | 30 MB | 2 MB |
| Requires iOS | 17.5 | **17.0** |
| Devices | — | **iPhone** |
| Age rating | 4+ | 4+ |
| Developer | [Morten Gregersen](https://appshunter.io/developer/414244543) | [Daniel Chiu Loong Ng](https://appshunter.io/developer/1755978644) |

## What reviewers say

### Formulize

[App page](https://appshunter.io/ios/app/formulize/id6503178796)

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Formulize Pro | $2.99 | one-time |


### CalcFlex

[App page](https://appshunter.io/ios/app/calcflex-calculator/id6520389768)

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| +3 New Variables | $1.99 | one-time |
| +20 New Equation Slots | $1.99 | one-time |
| +1 New Calculator | $3.99 | one-time |


## Frequently asked questions

### Is Formulize free?

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

### Is CalcFlex free?

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

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*