# okDuck vs Sentence Lab

The clearest difference is update cadence: Sentence Lab at every 6 weeks against okDuck's every 3 months. okDuck's advantage is iOS requirement (13.0 vs 15.1). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. okDuck sells 3 in-app purchases, starting at $2.99 per month and Sentence Lab sells 2 in-app purchases, starting at $5.99 per month. Whichever you choose, the download price is not the number that matters.

okDuck ships an update every 3 months, Sentence Lab every 6 weeks. The most recent releases landed on September 22, 2026 and September 23, 2026 respectively.

## The numbers

| Metric | okDuck | Sentence Lab |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 6 weeks** |
| Size | 57 MB | 43 MB |
| Requires iOS | **13.0** | 15.1 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [蕾 杨](https://appshunter.io/developer/1842688230) | [JEFFREY ROBERT SANCHEZ](https://appshunter.io/developer/1886201837) |

## What reviewers say

### okDuck

[App page](https://appshunter.io/ios/app/okduck/id6754228656)

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly VIP | $2.99 | per month |
| 连续包季VIP | $6.99 | per 3 months |
| Yearly VIP | $24.99 | per year |


### Sentence Lab

[App page](https://appshunter.io/ios/app/sentence-lab/id6760779281)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Sentence Lab Monthly Subscription | $5.99 | per month |
| Sentence Lab Yearly Subscription | $49.99 | per year |


## Frequently asked questions

### Is okDuck free?

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

### Is Sentence Lab free?

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

### Do okDuck or Sentence Lab have ads?

Neither okDuck nor Sentence Lab shows ads.

### Which is updated more often, okDuck or Sentence Lab?

okDuck ships an update every 3 months, and Sentence Lab every 6 weeks. Most recently, okDuck was updated on September 22, 2026 and Sentence Lab on September 23, 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.*