# Physics Answers vs Electron Flow

The clearest difference is in-app purchases: Electron Flow at none against Physics Answers's 2. Physics Answers's advantage is iOS requirement (11.4 vs 17.0). On price, ads and device support there is nothing between them.

Both are free to download. Physics Answers sells 2 in-app purchases, starting at $9.99 per month. Electron Flow asks for nothing beyond the download.

## The numbers

| Metric | Physics Answers | Electron Flow |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 months | — |
| Size | 111 MB | 6 MB |
| Requires iOS | **11.4** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Biobrain Learning Pty Ltd](https://appshunter.io/developer/1371680532) | [HANZ WONG](https://appshunter.io/developer/1896613535) |

## What reviewers say

### Physics Answers

[App page](https://appshunter.io/ios/app/physics-answers-ap-physics/id1510694550)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| All Content | $9.99 | per month |
| All Content | $49.99 | per year |


### Electron Flow

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

**In-app purchases:** none


## Frequently asked questions

### Is Physics Answers free?

Physics Answers 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 Physics Answers or Electron Flow have ads?

Neither Physics Answers 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.*