# Calculus Formulas vs Electron Flow

The clearest difference is in-app purchases: Electron Flow at none against Calculus Formulas's 3. Calculus Formulas's advantage is iOS requirement (15.1 vs 17.0). On price, ads and device support there is nothing between them.

Both are free to download. Calculus Formulas sells 3 in-app purchases, starting at $4.99 per 7 days. Electron Flow asks for nothing beyond the download.

## The numbers

| Metric | Calculus Formulas | Electron Flow |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Size | 48 MB | 6 MB |
| Requires iOS | **15.1** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Mobin Akhter](https://appshunter.io/developer/1812505286) | [HANZ WONG](https://appshunter.io/developer/1896613535) |

## What reviewers say

### Calculus Formulas

[App page](https://appshunter.io/ios/app/calculus-formulas-calcref/id6761394165)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Premium | $4.99 | per 7 days |
| CalcRef Yearly Premium | $44.99 | per year |
| CalcRef Premium Lifetime | $74.99 | one-time |


### Electron Flow

[App page](https://appshunter.io/ios/app/electron-flow/id6768893417)

**In-app purchases:** none


## Frequently asked questions

### Is Calculus Formulas free?

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

### Is Electron Flow free?

Electron Flow is free to download, with no in-app purchases.

### Do Calculus Formulas or Electron Flow have ads?

Neither Calculus Formulas nor Electron Flow shows ads.

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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.*