# SPD vs Astro Shock Zero

The clearest difference is in-app purchases: Astro Shock Zero at none against SPD's 6. SPD's advantage is update cadence (every 2 days vs weekly) and iOS requirement (12.0 vs 15.1). On price, ads and device support there is nothing between them.

Both are free to download. SPD sells 6 one-off in-app purchases. Astro Shock Zero asks for nothing beyond the download.

SPD ships an update every 2 days, Astro Shock Zero weekly. The most recent releases landed on October 15, 2026 and October 19, 2026 respectively.

## The numbers

| Metric | SPD | Astro Shock Zero |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | Yes | Yes |
| Update frequency | **Every 2 days** | Weekly |
| Size | 176 MB | 39 MB |
| Requires iOS | **12.0** | 15.1 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 9+ |
| Developer | [Purvisha Gadhiya](https://appshunter.io/developer/1608673782) | [Pena](https://appshunter.io/developer/1473707001) |

## What reviewers say

### SPD

[App page](https://appshunter.io/ios/app/spd-space-power-delta/id6469977600)

**Features:** macOS Compatibility

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Gems 10 | $0.99 | one-time |
| Gems 25 | $1.99 | one-time |
| Gems 40 | $2.99 | one-time |
| Gems 55 | $3.99 | one-time |
| Gems 70 | $4.99 | one-time |
| Gems 90 | $5.99 | one-time |


### Astro Shock Zero

[App page](https://appshunter.io/ios/app/astro-shock-zero/id6763540957)

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

**In-app purchases:** none


## Frequently asked questions

### Is SPD free?

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

### Is Astro Shock Zero free?

Astro Shock Zero is free to download, with no in-app purchases.

### Do SPD or Astro Shock Zero have ads?

Both SPD and Astro Shock Zero show ads.

### Which is updated more often, SPD or Astro Shock Zero?

SPD ships an update every 2 days, and Astro Shock Zero weekly. Most recently, SPD was updated on October 15, 2026 and Astro Shock Zero on October 19, 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.*