# Clausius BT vs Quick Voice Recorder Pro

The clearest difference is price: Clausius BT at Free against Quick Voice Recorder Pro's $3.99. Clausius BT also leads on update cadence (every 2 months vs every 20 months). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

Clausius BT is free to download; Quick Voice Recorder Pro costs $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Clausius BT ships an update every 2 months, Quick Voice Recorder Pro every 20 months. Both last shipped on November 3, 2026.

## The numbers

| Metric | Clausius BT | Quick Voice Recorder Pro |
| --- | --- | --- |
| Price | **Free** | $3.99 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 20 months |
| Size | 21 MB | 31 MB |
| Requires iOS | 13.0 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [SELTRON d.o.o.](https://appshunter.io/developer/894504883) | [SPIRITSHACK LTD](https://appshunter.io/developer/1562729686) |

## What reviewers say

### Clausius BT

[App page](https://appshunter.io/ios/app/clausius-bt/id1599744081)

**Features:** macOS Compatibility

**In-app purchases:** none


### Quick Voice Recorder Pro

[App page](https://appshunter.io/ios/app/quick-voice-recorder-pro/id1669981985)

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

**In-app purchases:** none


## Frequently asked questions

### Is Clausius BT free?

Clausius BT is free to download, with no in-app purchases.

### Is Quick Voice Recorder Pro free?

Quick Voice Recorder Pro costs $3.99, with no in-app purchases.

### Do Clausius BT or Quick Voice Recorder Pro have ads?

Neither Clausius BT nor Quick Voice Recorder Pro shows ads.

### Which is updated more often, Clausius BT or Quick Voice Recorder Pro?

Clausius BT ships an update every 2 months, and Quick Voice Recorder Pro every 20 months. Most recently, Clausius BT was updated on November 3, 2026 and Quick Voice Recorder Pro on November 3, 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.*