# Sentence Lab vs Rubi

The clearest difference is update cadence: Rubi at every 3 days against Sentence Lab's every 6 weeks. Rubi also leads on device support (4 vs 2). On price, ads, in-app purchases and iOS requirement there is nothing between them.

Both are free to download. Sentence Lab sells 2 in-app purchases, starting at $5.99 per month and Rubi sells 1 in-app purchase, starting at $0.99 per month. Whichever you choose, the download price is not the number that matters.

Sentence Lab ships an update every 6 weeks, Rubi every 3 days. Both last shipped on October 31, 2026.

## The numbers

| Metric | Sentence Lab | Rubi |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.0 (1 ratings)](https://appshunter.io/ios/app/sentence-lab/id6760779281/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Every 3 days** |
| Monetization | Free with in-app purchases | — |
| Size | 43 MB | 2 MB |
| Requires iOS | 15.1 | **15.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 17+ |
| Developer | [JEFFREY ROBERT SANCHEZ](https://appshunter.io/developer/1886201837) | [Shinichiro Yamashita](https://appshunter.io/developer/695153141) |

## What reviewers say

### Sentence Lab

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

Master Spanish sentence construction with this app. Practice translating English sentences into Spanish, receive instant feedback, and learn from detailed explanations. It uses spaced repetition and offers grammar guides and vocabulary flashcards.

**Highlights:** Translate English to Spanish sentences, Instant feedback and explanations, Spaced repetition learning, Grammar reference guides, Travel vocabulary flashcards, Detailed progress statistics, Offline practice support

**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 |


### Rubi

[App page](https://appshunter.io/ios/app/rubi-dual-subtitle-player/id6762080234)

**Features:** Safari Extension, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Rubi Pro Monthly | $0.99 | per month |


## Frequently asked questions

### Is Sentence Lab free?

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

### Is Rubi free?

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

### Do Sentence Lab or Rubi have ads?

Neither Sentence Lab nor Rubi shows ads.

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

Sentence Lab ships an update every 6 weeks, and Rubi every 3 days. Most recently, Sentence Lab was updated on October 31, 2026 and Rubi on October 31, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*