# Light Lab vs KORAKU

The clearest difference is in-app purchases: KORAKU at none against Light Lab's 2. KORAKU also leads on update cadence (weekly vs every 3 months) and iOS requirement (13.0 vs 16.6). Light Lab's advantage is ads (none vs shown). On price and device support there is nothing between them.

Both are free to download. Light Lab sells 2 one-off in-app purchases. KORAKU asks for nothing beyond the download.

Light Lab ships an update every 3 months, KORAKU weekly. Both last shipped on September 14, 2026.

## The numbers

| Metric | Light Lab | KORAKU |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | Every 3 months | **Weekly** |
| Size | 8 MB | 24 MB |
| Requires iOS | 16.6 | **13.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [THSS](https://appshunter.io/developer/1722239755) | [Fuji Bit Inc.](https://appshunter.io/developer/1874205957) |

## What reviewers say

### Light Lab

[App page](https://appshunter.io/ios/app/light-lab-learn-optics/id6504238420)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Purchase all lenses | $4.99 | one-time |
| Lens Ticket Issuance Function | $9.99 | one-time |


### KORAKU

[App page](https://appshunter.io/ios/app/koraku/id6760215571)

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

**In-app purchases:** none


## Frequently asked questions

### Is Light Lab free?

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

### Is KORAKU free?

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

### Do Light Lab or KORAKU have ads?

KORAKU shows ads; Light Lab does not.

### Which is updated more often, Light Lab or KORAKU?

Light Lab ships an update every 3 months, and KORAKU weekly. Most recently, Light Lab was updated on September 14, 2026 and KORAKU on September 14, 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.*