# OverclockeTD vs SPHERE

The clearest difference is in-app purchases: SPHERE at none against OverclockeTD's 6. OverclockeTD's advantage is ads (none vs shown) and update cadence (every 2 months vs every 4 months). On price, device support and iOS requirement there is nothing between them.

Both are free to download. OverclockeTD sells 6 one-off in-app purchases. SPHERE asks for nothing beyond the download.

OverclockeTD ships an update every 2 months, SPHERE every 4 months. The most recent releases landed on July 7, 2026 and September 8, 2026 respectively.

## The numbers

| Metric | OverclockeTD | SPHERE |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.4 (9 ratings)](https://appshunter.io/ios/app/overclocketd/id1505199638/reviews)** | — |
| Number of ratings | **9** | — |
| Positive reviews | 80.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | **Every 2 months** | Every 4 months |
| Monetization | Free with in-app purchases | — |
| Size | 115 MB | 154 MB |
| Requires iOS | **12.0** | 13.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 9+ | 4+ |
| Developer | [Jonas Krucher](https://appshunter.io/developer/1505199637) | [Tomoki Fukushima](https://appshunter.io/developer/1777185003) |

## What reviewers say

### OverclockeTD

[App page](https://appshunter.io/ios/app/overclocketd/id1505199638)

A synthwave-inspired tower defense game where you strategically place towers to eliminate enemies. Overclock your defenses for temporary boosts and protect your heart across multiple worlds and levels. Enjoy a free experience with optional additional content.

**Highlights:** Strategic tower placement, Overclocking for temporary power-ups, Synthwave 80s pixel art style, Multiple worlds and levels, Free to play with optional purchases

**Features:** macOS Compatibility

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Small Pledge | $0.99 | one-time |
| Premium: small amount | $0.99 | one-time |
| Medium Pledge | $2.99 | one-time |
| Premium: medium amount | $2.99 | one-time |
| Big Pledge | $4.99 | one-time |
| Premium: big amount | $4.99 | one-time |


### SPHERE

[App page](https://appshunter.io/ios/app/sphere-defense/id6737588413)

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

**In-app purchases:** none


## Frequently asked questions

### Is OverclockeTD free?

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

### Is SPHERE free?

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

### Do OverclockeTD or SPHERE have ads?

SPHERE shows ads; OverclockeTD does not.

### Which is updated more often, OverclockeTD or SPHERE?

OverclockeTD ships an update every 2 months, and SPHERE every 4 months. Most recently, OverclockeTD was updated on July 7, 2026 and SPHERE on September 8, 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.*