# BlueKeyDetect vs Astrum Audio

The clearest difference is price: Astrum Audio at Free against BlueKeyDetect's $0.99. Astrum Audio also leads on update cadence (every 6 weeks vs every 8 months). BlueKeyDetect's advantage is device support (3 vs 1) and iOS requirement (10.0 vs 16.0). On rating, ratings volume, ads and in-app purchases there is nothing between them.

Astrum Audio is free to download; BlueKeyDetect costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

On the App Store both sit at effectively the same score — 5.0 for BlueKeyDetect against 5.0 for Astrum Audio. Both are backed by a comparable volume of ratings — 1 and 1 respectively.

BlueKeyDetect ships an update every 8 months, Astrum Audio every 6 weeks. The most recent releases landed on October 13, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | BlueKeyDetect | Astrum Audio |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/bluekeydetect/id1493584771/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/astrum-audio/id6753939142/reviews) |
| Number of ratings | 1 | 1 |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 8 months | **Every 6 weeks** |
| Monetization | Paid | **Free** |
| Size | 15 MB | 5 MB |
| Requires iOS | **10.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Stefan Arnhold](https://appshunter.io/developer/432185706) | [Astrum World INC](https://appshunter.io/developer/1845816393) |

## What reviewers say

### BlueKeyDetect

[App page](https://appshunter.io/ios/app/bluekeydetect/id1493584771)

Instantly identify the musical key and tempo of songs by recording short audio clips. Ideal for musicians in jam sessions needing quick key information.

**Highlights:** Record audio clips, Detect musical key, Display beats per minute (BPM), Supports guitar and bass jam sessions, Multiple recording options for accuracy

**In-app purchases:** none


### Astrum Audio

[App page](https://appshunter.io/ios/app/astrum-audio/id6753939142)

This app provides full control over premium audio devices, offering easy pairing, sound customization, and firmware updates. Manage multiple devices, monitor battery status, and locate misplaced items for a personalized listening experience.

**Highlights:** Easy device pairing, Sound customization (EQ, bass, treble), Firmware updates, Multi-device management, Mode selection (noise cancellation, gaming), Battery status monitoring, Find My Device feature

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

**In-app purchases:** none


## Frequently asked questions

### Is BlueKeyDetect free?

BlueKeyDetect costs $0.99, with no in-app purchases.

### Is Astrum Audio free?

Astrum Audio is free to download, with no in-app purchases.

### Which has better reviews, BlueKeyDetect or Astrum Audio?

BlueKeyDetect and Astrum Audio are both rated 5.0 out of 5 on the App Store, from 1 and 1 ratings respectively.

### Do BlueKeyDetect or Astrum Audio have ads?

Neither BlueKeyDetect nor Astrum Audio shows ads.

### Which is updated more often, BlueKeyDetect or Astrum Audio?

BlueKeyDetect ships an update every 8 months, and Astrum Audio every 6 weeks. Most recently, BlueKeyDetect was updated on October 13, 2026 and Astrum Audio on October 25, 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.*