# SubStreamer vs Slim K Vault

The clearest difference is rating: Slim K Vault at 5.0 against SubStreamer's 4.0. Slim K Vault also leads on review sentiment (100% vs 72%). SubStreamer's advantage is ratings volume (141 vs 7). On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Slim K Vault holds the better App Store score, 5.0 against 4.0. That said, the two scores are not equally well evidenced: SubStreamer has 141 ratings behind it against 7, so its average is the more settled of the two. Written reviews point the same way: 72% of SubStreamer's written reviews are positive against 100% of Slim K Vault's.

SubStreamer ships an update every 2 weeks, Slim K Vault fortnightly. The most recent releases landed on October 10, 2026 and September 24, 2026 respectively.

## The numbers

| Metric | SubStreamer | Slim K Vault |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.0 (141 ratings)](https://appshunter.io/ios/app/substreamer/id1012991665/reviews) | **[5.0 (7 ratings)](https://appshunter.io/ios/app/slim-k-vault/id6757439092/reviews)** |
| Number of ratings | **141** | 7 |
| Positive reviews | 72.2% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 weeks** | Fortnightly |
| Monetization | Free | Free |
| Size | 55 MB | 62 MB |
| Requires iOS | 16.4 | **15.1** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | +4 | 12+ |
| Developer | [Gaven Henry](https://appshunter.io/developer/925249622) | [SK WORLDWIDE INDUSTRIES, LLC](https://appshunter.io/developer/1866966664) |

## What reviewers say

### SubStreamer

[App page](https://appshunter.io/ios/app/substreamer/id1012991665)

Access and stream your personal music library from a Subsonic-compatible server on your mobile device. Enjoy offline playback, personalized mixes, and detailed listening analytics without ads or subscriptions.

**Highlights:** Stream and download music library, Offline listening with background processing, Personalized smart mixes, Listening analytics and scrobbling, Playlist and library management, Background playback with lock screen controls, Open source

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

**In-app purchases:** none

**What reviewers like**

- 🎨 Beautiful and modern UI design
- ⚡ Clean, intuitive interface
- 🎵 Excellent Navidrome server compatibility
- 📱 Works seamlessly with self-hosted music servers
- 🔄 Reliable background playback functionality

**What reviewers complain about**

- 🐛 Frequent playback failures and stalling
- 🐛 Random crashes during playback
- 🐛 Scrobbling not working reliably
- 🐛 Large file playback issues (10MB+)
- 🐛 AirPlay/Apple TV streaming broken

**Reported bugs**

- Songs fail to play without double-pressing play button
- Playback stops with 4 seconds remaining in track
- Skipping back crashes the app
- Large files (10MB+) require pause-then-play to start
- Scrobbling fails despite server support

**Requested features**

- CarPlay support for in-car use
- Traditional Chinese language support
- Simplified Chinese language support
- All-songs library view (not just albums/artists)
- Lyrics API integration


### Slim K Vault

[App page](https://appshunter.io/ios/app/slim-k-vault/id6757439092)

Stream exclusive slowed mixes and remixes from DJ Slim K. Discover music by mood, enjoy gapless playback, and receive notifications for new drops. Access a curated selection for free or unlock the full catalog with tiered access.

**Highlights:** Exclusive slowed mixes and remixes, Mood-based music discovery, Gapless playback, Background audio and lock screen controls, Weekly new drops, Tiered access levels

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

**In-app purchases:** none


## Frequently asked questions

### Is SubStreamer free?

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

### Is Slim K Vault free?

Slim K Vault is free to download, with no in-app purchases.

### Which has better reviews, SubStreamer or Slim K Vault?

Slim K Vault is rated higher. SubStreamer averages 4.0 out of 5 from 141 ratings, while Slim K Vault averages 5.0 from 7 ratings.

### Do SubStreamer or Slim K Vault have ads?

Neither SubStreamer nor Slim K Vault shows ads.

### Which is updated more often, SubStreamer or Slim K Vault?

SubStreamer ships an update every 2 weeks, and Slim K Vault fortnightly. Most recently, SubStreamer was updated on October 10, 2026 and Slim K Vault on September 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.*