# Protocol vs Milthm

The clearest difference is rating: Milthm at 4.9 against Protocol's 4.2. Milthm also leads on update cadence (every 2 weeks vs every 3 months) and review sentiment (92% vs 79%). Protocol's advantage is iOS requirement (9.0 vs 15.0). On price, ads, in-app purchases and monetization model there is nothing between them.

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

Milthm holds the better App Store score, 4.9 against 4.2. That said, the two scores are not equally well evidenced: Milthm has 275 ratings behind it against 53, so its average is the more settled of the two. Written reviews point the same way: 79% of Protocol's written reviews are positive against 92% of Milthm's.

Protocol ships an update every 3 months, Milthm every 2 weeks. The most recent releases landed on September 23, 2026 and September 25, 2026 respectively.

## The numbers

| Metric | Protocol | Milthm |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.2 (53 ratings)](https://appshunter.io/ios/app/protocolhyperspace-diver/id1124788464/reviews) | **[4.9 (275 ratings)](https://appshunter.io/ios/app/milthm/id6451048899/reviews)** |
| Number of ratings | 53 | **275** |
| Positive reviews | 78.5% of reviews | **92.3% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 2 weeks** |
| Monetization | Free | Free |
| Size | 274 MB | 1.1 GB |
| Requires iOS | **9.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [LINE Games](https://appshunter.io/developer/447309128) | [志琰 陈](https://appshunter.io/developer/1696218830) |

## What reviewers say

### Protocol

[App page](https://appshunter.io/ios/app/protocolhyperspace-diver/id1124788464)

Experience a unique rhythm game set in a musical hyperspace. Enjoy tense 3D note patterns synchronized with music from famous artists and popular game soundtracks. Optimized for smartphones and tablets.

**Highlights:** Unique 3D visual note patterns, Music from famous artists, Soundtracks from popular games, Optimized for smartphone/tablet, Tense rhythm gameplay

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

**In-app purchases:** none


### Milthm

[App page](https://appshunter.io/ios/app/milthm/id6451048899)

Immerse yourself in a rhythm game with a "Dreams" and "Rain" theme. Enjoy dynamic tracks, a clean UI, and unique replay modes that adjust difficulty. Experience a blend of music, animation, and challenging gameplay.

**Highlights:** Clean UI design with rain theme, Dream replay mode with adjustable difficulty, Vivid chart design, High-quality music tracks, Wonderful Trial for automatic restart, Fade out notes for increased challenge, Downpour mode for chaotic gameplay

**In-app purchases:** none

**What reviewers like**

- 🎵 Excellent song variety and quality
- 🎨 Beautiful UI design and visual effects
- ⚡ Smooth and polished gameplay experience
- 🎯 Unique and creative charting style
- 💰 No gacha, ads, or pay-to-win mechanics

**What reviewers complain about**

- 🐛 Frequent crashes and black screen issues
- 📱 Compatibility problems with older iOS devices
- ⚙️ Occasional frame rate stuttering and lag
- 🎯 Overly strict S-rank requirements (all perfect needed)
- 🔧 Hitbox detection inconsistencies

**Reported bugs**

- App crashes on startup or black screen freeze
- Crashes when playing specific charts (e.g., mornflutter, Downpour)
- 404 cloudburst error preventing song playback
- Incompatibility with iPad Air 1 and older iOS versions
- Game freezes at splash screen

**Requested features**

- Cloud save/account synchronization
- Chinese mainland server launch
- Notch and Dynamic Island optimization settings
- Screen edge width adjustment for gameplay
- More lenient rating system (full combo instead of all perfect)


## Frequently asked questions

### Is Protocol free?

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

### Is Milthm free?

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

### Which has better reviews, Protocol or Milthm?

Milthm is rated higher. Protocol averages 4.2 out of 5 from 53 ratings, while Milthm averages 4.9 from 275 ratings.

### Do Protocol or Milthm have ads?

Neither Protocol nor Milthm shows ads.

### Which is updated more often, Protocol or Milthm?

Protocol ships an update every 3 months, and Milthm every 2 weeks. Most recently, Protocol was updated on September 23, 2026 and Milthm on September 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.*