# Sink In vs SubFit

The clearest difference is in-app purchases: Sink In at none against SubFit's 2. On price, update cadence, ads and device support there is nothing between them.

Both are free to download. SubFit sells 2 in-app purchases, starting at $1.99 per month. Sink In asks for nothing beyond the download.

Sink In ships an update every 2 weeks, SubFit every 9 days. The most recent releases landed on October 31, 2026 and November 6, 2026 respectively.

## The numbers

| Metric | Sink In | SubFit |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/sink-in-language-in-context/id6786764536/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 weeks | **Every 9 days** |
| Monetization | Free | — |
| Size | 39 MB | 13 MB |
| Requires iOS | 15.1 | **15.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Syuan Yu Siao](https://appshunter.io/developer/6784940490) | [Cheng-Gang Wang](https://appshunter.io/developer/6790284003) |

## What reviewers say

### Sink In

[App page](https://appshunter.io/ios/app/sink-in-language-in-context/id6786764536)

Learn languages by transforming any text into interactive lessons. Analyze vocabulary, grammar, tone, and sentence structure. Practice with spaced repetition, quizzes, and timed challenges.

**Highlights:** Screenshot and paste text for lessons, On-device text recognition, Vocabulary, grammar, tone analysis, Spaced repetition review, Quiz and timed challenge modes, Cross-device learning history sync

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

**In-app purchases:** none


### SubFit

[App page](https://appshunter.io/ios/app/subfit/id6790284001)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| SubFit Plus 會員 | $1.99 | per month |
| SubFit Pro 會員 | $3.99 | per month |


## Frequently asked questions

### Is Sink In free?

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

### Is SubFit free?

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

### Do Sink In or SubFit have ads?

Neither Sink In nor SubFit shows ads.

### Which is updated more often, Sink In or SubFit?

Sink In ships an update every 2 weeks, and SubFit every 9 days. Most recently, Sink In was updated on October 31, 2026 and SubFit on November 6, 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.*