# SentenceDeck vs OpenKoto

The clearest difference is in-app purchases: OpenKoto at none against SentenceDeck's 3. OpenKoto also leads on update cadence (weekly vs every 6 weeks). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. SentenceDeck sells 3 one-off in-app purchases. OpenKoto asks for nothing beyond the download.

SentenceDeck ships an update every 6 weeks, OpenKoto weekly. The most recent releases landed on October 15, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | SentenceDeck | OpenKoto |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/openkoto/id6793335573/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Weekly** |
| Size | 36 MB | 9 MB |
| Requires iOS | **17.0** | 18.0 |
| Devices | iPhone, iPad | **iPhone, iPad, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [奇濂 任](https://appshunter.io/developer/1843376248) | [倍铭 刘](https://appshunter.io/developer/1831757727) |

## What reviewers say

### SentenceDeck

[App page](https://appshunter.io/ios/app/sentencedeck-shadowing/id6759489049)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Credits 100 | $0.99 | one-time |
| Credits 500 | $3.99 | one-time |
| Credits 1200 | $7.99 | one-time |


### OpenKoto

[App page](https://appshunter.io/ios/app/openkoto/id6793335573)

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is SentenceDeck free?

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

### Is OpenKoto free?

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

### Do SentenceDeck or OpenKoto have ads?

Neither SentenceDeck nor OpenKoto shows ads.

### Which is updated more often, SentenceDeck or OpenKoto?

SentenceDeck ships an update every 6 weeks, and OpenKoto weekly. Most recently, SentenceDeck was updated on October 15, 2026 and OpenKoto on October 24, 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.*