# Vocabulary Builder by Learning vs Rusty

The clearest difference is ads: Vocabulary Builder by Learning at none against Rusty's shown. Vocabulary Builder by Learning also leads on ratings volume (551 vs 4). Rusty's advantage is review sentiment (100% vs 68%) and rating (5.0 vs 4.7). On price, update cadence, in-app purchases and monetization model there is nothing between them.

Both are free to download. Vocabulary Builder by Learning sells 11 in-app purchases, starting at $2.99 per 7 days and Rusty sells 2 in-app purchases, starting at $6.99 per month. Whichever you choose, the download price is not the number that matters.

Rusty holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: Vocabulary Builder by Learning has 551 ratings behind it against 4, so its average is the more settled of the two. Written reviews point the same way: 68% of Vocabulary Builder by Learning's written reviews are positive against 100% of Rusty's.

Both ship on a similar rhythm, roughly weekly. The most recent releases landed on October 15, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | Vocabulary Builder by Learning | Rusty |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.7 (551 ratings)](https://appshunter.io/ios/app/vocabulary-builder-by-learning/id6738261069/reviews) | **[5.0 (4 ratings)](https://appshunter.io/ios/app/rusty-reading-and-math-tutor/id6777604306/reviews)** |
| Number of ratings | **551** | 4 |
| Positive reviews | 67.9% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Weekly | Weekly |
| Monetization | Free with in-app purchases | Freemium |
| Size | 76 MB | 266 MB |
| Requires iOS | **17.0** | 18.0 |
| Devices | **iPhone, iPad, Apple Watch** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Learning Learn LLC](https://appshunter.io/developer/1799893146) | [FOUR STAR GROUP INC](https://appshunter.io/developer/1896680979) |

## What reviewers say

### Vocabulary Builder by Learning

[App page](https://appshunter.io/ios/app/vocabulary-builder-by-learning/id6738261069)

Enhance your English vocabulary with daily words, definitions, and usage examples. Access over 20,000 words across various categories, set personalized learning goals, and test your knowledge with interactive quizzes. Features include home screen widgets and shareable flashcards for convenient learning.

**Highlights:** Daily Word of the Day, 20,000+ Word Library, Personalized Learning & Goals, Interactive Quizzes, Widgets & Reminders, Shareable Flashcards

**Features:** Apple Watch app, Vision Pro support

**In-app purchases (11)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Learning Weekly | $2.99 | per 7 days |
| Premium Learning Monthly | $4.99 | per month |
| Vocabulary Monthly Subscription | $7.99 | per month |
| Premium Learning Weekly | $12.99 | per 7 days |
| Learn Vocabulary Premium Value | $19.99 | per year |
| Annual Subscription 50% Discount | $24.99 | per year |
| Premium Learning Annual | $24.99 | per year |
| Vocabulary Annual Discount | $34.99 | per year |
| Vocabulary Annual Subscription | $34.99 | per year |
| Premium Learning Lifetime | $59.99 | one-time |
| Vocabulary Lifetime Subscription | $89.99 | one-time |


### Rusty

[App page](https://appshunter.io/ios/app/rusty-reading-and-math-tutor/id6777604306)

This app strengthens cognitive skills like mental math, articulation, and critical thinking through daily AI-powered training. It focuses on improving how you think, solve problems, and communicate, rather than just memorization. Track your progress and build mental sharpness for the AI age.

**Highlights:** Mental Math training, AI-powered articulation feedback, Verbal fluency exercises, Critical thinking challenges, Focus and concentration training, Problem-solving activities, Progress tracking and benchmarks

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Rusty Premium | $6.99 | per month |
| Rusty Premium | $39.99 | per year |


## Frequently asked questions

### Is Vocabulary Builder by Learning free?

Vocabulary Builder by Learning is free to download, with in-app purchases available.

### Is Rusty free?

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

### Which has better reviews, Vocabulary Builder by Learning or Rusty?

Rusty is rated higher. Vocabulary Builder by Learning averages 4.7 out of 5 from 551 ratings, while Rusty averages 5.0 from 4 ratings.

### Do Vocabulary Builder by Learning or Rusty have ads?

Rusty shows ads; Vocabulary Builder by Learning does not.

### Which is updated more often, Vocabulary Builder by Learning or Rusty?

Vocabulary Builder by Learning ships an update weekly, and Rusty weekly. Most recently, Vocabulary Builder by Learning was updated on October 15, 2026 and Rusty on October 1, 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.*