# Sound Sky vs OpenLock

The clearest difference is in-app purchases: OpenLock at none against Sound Sky's 4. OpenLock also leads on ads (none vs shown) and iOS requirement (13.0 vs 15.0). Sound Sky's advantage is update cadence (every 2 weeks vs every 8 months). On price and device support there is nothing between them.

Both are free to download. Sound Sky sells 4 one-off in-app purchases. OpenLock asks for nothing beyond the download.

Sound Sky ships an update every 2 weeks, OpenLock every 8 months. The most recent releases landed on October 29, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Sound Sky | OpenLock |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (341 ratings)](https://appshunter.io/ios/app/sound-sky-keep-calm-drum-on/id1170680370/reviews)** | — |
| Number of ratings | **341** | — |
| Positive reviews | 91.5% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Every 2 weeks** | Every 8 months |
| Monetization | Free with in-app purchases | — |
| Size | 158 MB | 78 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [HIGHKEY Games](https://appshunter.io/developer/1170680369) | [Kıyan SISAKHTI](https://appshunter.io/developer/1704015191) |

## What reviewers say

### Sound Sky

[App page](https://appshunter.io/ios/app/sound-sky-keep-calm-drum-on/id1170680370)

Immerse yourself in a unique rhythm game designed for stress relief and musical exploration. Master tempo and timing with meditative soundtracks and mesmerizing visuals across over 50 levels. Perfect for music enthusiasts and aspiring percussionists alike.

**Highlights:** Meditative soundtracks, Unique finger drumming experience, Over 50 levels with original music, Mesmerizing visuals, Accurate scoring for tempo and timing, Explore a universe of planets with unique songs

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pack of 3 Soundstones | $0.99 | one-time |
| Half Energy Discount (1 week) | $0.99 | one-time |
| Half Energy Discount (2 weeks) | $2.99 | one-time |
| Founder's Pack | $4.99 | one-time |

**What reviewers like**

- 😌 Highly calming and stress-relieving gameplay
- 🎵 Beautiful music and atmospheric soundtrack
- 🎨 Stunning visuals and space-themed graphics
- 🧠 Unique memory-based rhythm mechanic
- ⏱️ Perfect timing and rhythm synchronization

**What reviewers complain about**

- 📉 Limited content and levels once completed
- 🔋 High battery drain and phone overheating
- ⏳ Long download times reported
- 🔊 Harsh error sound effects when missing notes
- ⚡ Energy system limits play sessions

**Reported bugs**

- Download fails or takes excessive time
- Music and beats out of sync
- Tap inputs not registering properly
- Phone overheating during extended play
- Inconsistent rhythm detection

**Requested features**

- Add more levels and content
- Include recognizable and popular songs
- Release official soundtrack
- Allow players to select different music/sounds
- Add diverse note combinations without disappearing mechanic


### OpenLock

[App page](https://appshunter.io/ios/app/openlock-infinity/id6474688652)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Sound Sky free?

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

### Is OpenLock free?

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

### Do Sound Sky or OpenLock have ads?

Sound Sky shows ads; OpenLock does not.

### Which is updated more often, Sound Sky or OpenLock?

Sound Sky ships an update every 2 weeks, and OpenLock every 8 months. Most recently, Sound Sky was updated on October 29, 2026 and OpenLock on October 30, 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.*