# SoundBG vs KeyPM

The clearest difference is review sentiment: KeyPM at 100% against SoundBG's 44%. KeyPM also leads on rating (5.0 vs 4.3) and in-app purchases (none vs 4). SoundBG's advantage is ratings volume (832 vs 5) and update cadence (monthly vs every 3 months). On price and device support there is nothing between them.

Both are free to download. SoundBG sells 4 in-app purchases, starting at $1.99 per 7 days. KeyPM asks for nothing beyond the download.

KeyPM holds the better App Store score, 5.0 against 4.3. That said, the two scores are not equally well evidenced: SoundBG has 832 ratings behind it against 5, so its average is the more settled of the two. Written reviews point the same way: 44% of SoundBG's written reviews are positive against 100% of KeyPM's.

SoundBG ships an update monthly, KeyPM every 3 months. Both last shipped on October 24, 2026.

## The numbers

| Metric | SoundBG | KeyPM |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.3 (832 ratings)](https://appshunter.io/ios/app/soundbg/id1450235611/reviews) | **[5.0 (5 ratings)](https://appshunter.io/ios/app/keypm/id1509802163/reviews)** |
| Number of ratings | **832** | 5 |
| Positive reviews | 44.1% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Monthly** | Every 3 months |
| Monetization | Free with in-app purchases | **Free** |
| Size | 29 MB | 42 MB |
| Requires iOS | **12.0** | 15.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Nursing Baby Apps](https://appshunter.io/developer/1511180210) | [Hugo Canseco Llanos](https://appshunter.io/developer/1871098482) |

## What reviewers say

### SoundBG

[App page](https://appshunter.io/ios/app/soundbg/id1450235611)

Drift off to sleep with a wide variety of ambient soundscapes, enhanced by beautiful 3D animations. Features an intuitive timer to automatically turn off sounds, and offers premium access for an ad-free experience.

**Highlights:** Extensive library of sleep sounds, 3D animated visualizer, Intuitive sleep timer, Ad-free premium option, Auto-renewing subscription

**Features:** macOS Compatibility

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Sleep Sounds | $1.99 | per 7 days |
| Premium Sleep Sounds | $4.99 | per month |
| Premium Sleep Sounds | $29.99 | per year |
| Premium Sleep Sounds | $3.99 | one-time |

**What reviewers like**

- 🌊 Relaxing sounds
- 💤 Helps with sleep
- 🕰️ Useful timer feature

**What reviewers complain about**

- 💰 Requires paid subscription
- 🚫 Misleading free trial
- 🤖 Poor user experience
- 📢 Excessive ads

**Reported bugs**

- Subscription issues
- Crashing and freezing
- Compatibility problems

**Requested features**

- More free sound options
- Landscape mode
- Better sound quality


### KeyPM

[App page](https://appshunter.io/ios/app/keypm/id1509802163)

Discover the key and tempo of your favorite songs. Analyze music charts, create playlists with song metrics, and filter by musical characteristics. Preview tracks and share music insights with others.

**Highlights:** Analyze Billboard top 100, Create playlists with song metrics, Filter by key, BPM, Camelot, and mode, Preview songs from Spotify, Share music DNA

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

**In-app purchases:** none


## Frequently asked questions

### Is SoundBG free?

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

### Is KeyPM free?

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

### Which has better reviews, SoundBG or KeyPM?

KeyPM is rated higher. SoundBG averages 4.3 out of 5 from 832 ratings, while KeyPM averages 5.0 from 5 ratings.

### Do SoundBG or KeyPM have ads?

SoundBG shows ads; KeyPM does not.

### Which is updated more often, SoundBG or KeyPM?

SoundBG ships an update monthly, and KeyPM every 3 months. Most recently, SoundBG was updated on October 24, 2026 and KeyPM on October 24, 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.*