# Sensor Recorder Pro vs 错题本

The clearest difference is in-app purchases: 错题本 at none against Sensor Recorder Pro's 1. 错题本 also leads on iOS requirement (13 vs 15.4). On price, ads and device support there is nothing between them.

Both are free to download. Sensor Recorder Pro sells 1 one-off in-app purchase. 错题本 asks for nothing beyond the download.

## The numbers

| Metric | Sensor Recorder Pro | 错题本 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 4 weeks | — |
| Size | 3 MB | 13 MB |
| Requires iOS | 15.4 | **13** |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [晓聪 姜](https://appshunter.io/developer/6782490208) | [媛媛 钱](https://appshunter.io/developer/1869024065) |

## What reviewers say

### Sensor Recorder Pro

[App page](https://appshunter.io/ios/app/sensor-recorder-pro/id6782758613)

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlimited Recording | $2.99 | one-time |


### 错题本

[App page](https://appshunter.io/ios/app/id6793146293)

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

**In-app purchases:** none


## Frequently asked questions

### Is Sensor Recorder Pro free?

Sensor Recorder Pro is free to download, with in-app purchases available.

### Is 错题本 free?

错题本 is free to download, with no in-app purchases.

### Do Sensor Recorder Pro or 错题本 have ads?

Neither Sensor Recorder Pro nor 错题本 shows ads.

---

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