# InsideKU vs Butterfly Discover

The clearest difference is in-app purchases: InsideKU at none against Butterfly Discover's 1. InsideKU also leads on iOS requirement (15.6 vs 17.0). Butterfly Discover's advantage is update cadence (fortnightly vs every 6 months). On price, ads and device support there is nothing between them.

Both are free to download. Butterfly Discover sells 1 one-off in-app purchase. InsideKU asks for nothing beyond the download.

InsideKU ships an update every 6 months, Butterfly Discover fortnightly. The most recent releases landed on October 2, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | InsideKU | Butterfly Discover |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 6 months | **Fortnightly** |
| Size | 17 MB | 791 MB |
| Requires iOS | **15.6** | 17.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Age rating | 4+ | 4+ |
| Developer | [Kasetsart University](https://appshunter.io/developer/1350631517) | [Rizk Corsight, LLC](https://appshunter.io/developer/1896065289) |

## What reviewers say

### InsideKU

[App page](https://appshunter.io/ios/app/insideku/id1097690261)

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

**In-app purchases:** none


### Butterfly Discover

[App page](https://appshunter.io/ios/app/butterfly-discover/id6797183800)

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full access | $3.99 | one-time |


## Frequently asked questions

### Is InsideKU free?

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

### Is Butterfly Discover free?

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

### Do InsideKU or Butterfly Discover have ads?

Neither InsideKU nor Butterfly Discover shows ads.

### Which is updated more often, InsideKU or Butterfly Discover?

InsideKU ships an update every 6 months, and Butterfly Discover fortnightly. Most recently, InsideKU was updated on October 2, 2026 and Butterfly Discover on October 1, 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.*