# KOI Keyboard vs OtterBoard

The clearest difference is ads: KOI Keyboard at none against OtterBoard's shown. On price, update cadence, in-app purchases and device support there is nothing between them.

Both are free to download. KOI Keyboard sells 18 one-off in-app purchases and OtterBoard sells 8 in-app purchases, starting at $5.99 per year. Whichever you choose, the download price is not the number that matters.

KOI Keyboard ships an update every 4 days, OtterBoard every 3 days. The most recent releases landed on October 31, 2026 and October 29, 2026 respectively.

## The numbers

| Metric | KOI Keyboard | OtterBoard |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 4 days | **Every 3 days** |
| Size | 363 MB | 227 MB |
| Requires iOS | **16.0** | 17.0 |
| Devices | iPhone | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Chi Yu Cheng](https://appshunter.io/developer/1896654870) | [One Eternal](https://appshunter.io/developer/6792182843) |

## What reviewers say

### KOI Keyboard

[App page](https://appshunter.io/ios/app/koi-keyboard/id6789937180)

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

**In-app purchases (18)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 精鑄銀 | $0.99 | one-time |
| 霜晶 | $0.99 | one-time |
| 織絹 | $0.99 | one-time |
| 稜鏡主題 | $0.99 | one-time |
| 脈衝主題 | $0.99 | one-time |
| 浮影主題 | $0.99 | one-time |
| 座標主題 | $0.99 | one-time |
| 翹角主題 | $0.99 | one-time |
| 柔丘主題 | $0.99 | one-time |
| 隱翹主題 | $0.99 | one-time |
| 隱翹・律主題 | $0.99 | one-time |
| 隱翹・霓主題 | $0.99 | one-time |
| 紙墨 | $1.99 | one-time |
| 櫻桃軟糖 | $1.99 | one-time |
| 橙潮掌機 | $1.99 | one-time |
| 午夜爵士 | $1.99 | one-time |
| 青釉 | $1.99 | one-time |
| KOI Keyboard Sizing | $1.99 | one-time |


### OtterBoard

[App page](https://appshunter.io/ios/app/otterboard/id6803947273)

**Features:** iPhone Duo support

**In-app purchases (8)**

| Purchase | Price | Billing |
| --- | --- | --- |
| OtterBoard Pro Yearly | $5.99 | per year |
| 極光鍵盤主題 | $1.99 | one-time |
| 青苔螢火鍵盤主題 | $3.99 | one-time |
| 墨流鍵盤主題 | $4.99 | one-time |
| 夢幻泡泡鍵盤主題 | $5.99 | one-time |
| 機械 RGB 鍵盤主題 01 | $5.99 | one-time |
| 倉頡碼雨 Cangjie Rain 鍵盤主題 | $5.99 | one-time |
| OtterBoard Pro Lifetime | $14.99 | one-time |


## Frequently asked questions

### Is KOI Keyboard free?

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

### Is OtterBoard free?

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

### Do KOI Keyboard or OtterBoard have ads?

OtterBoard shows ads; KOI Keyboard does not.

### Which is updated more often, KOI Keyboard or OtterBoard?

KOI Keyboard ships an update every 4 days, and OtterBoard every 3 days. Most recently, KOI Keyboard was updated on October 31, 2026 and OtterBoard on October 29, 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.*