# Kioku vs PIECE

The clearest difference is in-app purchases: PIECE at none against Kioku's 1. Kioku's advantage is iOS requirement (15.1 vs 17.0). On price, ads and device support there is nothing between them.

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

## The numbers

| Metric | Kioku | PIECE |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | — | Every 3 days |
| Size | 33 MB | 12 MB |
| Requires iOS | **15.1** | 17.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [HIROAKI TANO](https://appshunter.io/developer/1884766711) | [Shuntaro Shimada](https://appshunter.io/developer/1851679432) |

## What reviewers say

### Kioku

[App page](https://appshunter.io/ios/app/kioku-spaced-flashcards/id6760512052)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Spaced Premium | $1.99 | one-time |


### PIECE

[App page](https://appshunter.io/ios/app/piece/id6796343521)

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

**In-app purchases:** none


## Frequently asked questions

### Is Kioku free?

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

### Is PIECE free?

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

### Do Kioku or PIECE have ads?

Neither Kioku nor PIECE shows ads.

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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.*