# InvertKeep vs IsoSphere

The clearest difference is in-app purchases: IsoSphere at none against InvertKeep's 1. IsoSphere also leads on update cadence (every 3 days vs fortnightly) and iOS requirement (15.0 vs 26.0). On price, ads and device support there is nothing between them.

Both are free to download. InvertKeep sells 1 one-off in-app purchase. IsoSphere asks for nothing beyond the download.

InvertKeep ships an update fortnightly, IsoSphere every 3 days. The most recent releases landed on July 20, 2026 and September 13, 2026 respectively.

## The numbers

| Metric | InvertKeep | IsoSphere |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Fortnightly | **Every 3 days** |
| Size | 361 MB | 41 MB |
| Requires iOS | 26.0 | **15.0** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [JARED WILLIAM COFFMAN](https://appshunter.io/developer/1895897887) | [Adrian Krzewinski](https://appshunter.io/developer/6788739110) |

## What reviewers say

### InvertKeep

[App page](https://appshunter.io/ios/app/invertkeep/id6777580871)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| InvertKeep Pro | $4.99 | one-time |


### IsoSphere

[App page](https://appshunter.io/ios/app/isosphere/id6788739108)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is InvertKeep free?

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

### Is IsoSphere free?

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

### Do InvertKeep or IsoSphere have ads?

Neither InvertKeep nor IsoSphere shows ads.

### Which is updated more often, InvertKeep or IsoSphere?

InvertKeep ships an update fortnightly, and IsoSphere every 3 days. Most recently, InvertKeep was updated on July 20, 2026 and IsoSphere on September 13, 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.*