# Subterraneous vs OptiSound

The clearest difference is in-app purchases: OptiSound at none against Subterraneous's 2. OptiSound also leads on ads (none vs shown) and update cadence (every 3 weeks vs every 2 months). On price, device support and iOS requirement there is nothing between them.

Both are free to download. Subterraneous sells 2 in-app purchases, starting at $5.99 per month. OptiSound asks for nothing beyond the download.

Subterraneous ships an update every 2 months, OptiSound every 3 weeks. The most recent releases landed on October 16, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | Subterraneous | OptiSound |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 2 months | **Every 3 weeks** |
| Size | 111 MB | 79 MB |
| Requires iOS | **14.0** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 17+ | 4+ |
| Developer | [Damon Robertson](https://appshunter.io/developer/1763582490) | [OptiSigns Inc](https://appshunter.io/developer/1475554406) |

## What reviewers say

### Subterraneous

[App page](https://appshunter.io/ios/app/subterraneous/id6642695079)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Monthly Music Access | $5.99 | per month |
| Premium Yearly Music Access | $46.99 | per year |


### OptiSound

[App page](https://appshunter.io/ios/app/optisound/id6743694208)

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

**In-app purchases:** none


## Frequently asked questions

### Is Subterraneous free?

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

### Is OptiSound free?

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

### Do Subterraneous or OptiSound have ads?

Subterraneous shows ads; OptiSound does not.

### Which is updated more often, Subterraneous or OptiSound?

Subterraneous ships an update every 2 months, and OptiSound every 3 weeks. Most recently, Subterraneous was updated on October 16, 2026 and OptiSound on October 5, 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.*