# Grammar Express vs Inference Ace

The clearest difference is review sentiment: Inference Ace at 89% against Grammar Express's 0%. Inference Ace also leads on rating (3.5 vs 2.0) and ratings volume (22 vs 1). Grammar Express's advantage is monetization model (free vs free with in-app purchases). On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Grammar Express sells 1 one-off in-app purchase and Inference Ace sells 3 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

Inference Ace holds the better App Store score, 3.5 against 2.0. That said, the two scores are not equally well evidenced: Inference Ace has 22 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 0% of Grammar Express's written reviews are positive against 89% of Inference Ace's.

Grammar Express ships an update every 13 months, Inference Ace every 7 months. The most recent releases landed on November 1, 2026 and November 6, 2026 respectively.

## The numbers

| Metric | Grammar Express | Inference Ace |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.0 (1 ratings)](https://appshunter.io/ios/app/grammar-express-nouns-lite/id369556344/reviews) | **[3.5 (22 ratings)](https://appshunter.io/ios/app/inference-ace/id866920724/reviews)** |
| Number of ratings | 1 | **22** |
| Positive reviews | 0.0% of reviews | **88.6% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 13 months | **Every 7 months** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 10 MB | 22 MB |
| Requires iOS | 15.0 | **12.2** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | +4 | 4+ |
| Developer | [Webrich Software Limited](https://appshunter.io/developer/290203591) | [Janine Toole](https://appshunter.io/developer/839832427) |

## What reviewers say

### Grammar Express

[App page](https://appshunter.io/ios/app/grammar-express-nouns-lite/id369556344)

Master the different types of nouns with interactive lessons and quizzes. Improve your understanding of noun classification, gender, number, and case through practice questions and detailed feedback. Track your progress with visual charts and customize your learning experience with adjustable timers.

**Highlights:** 48+ pages of grammar lessons and rules, 327+ examples with explanations, 450 multiple-choice questions, Topic-based study and mock tests, Detailed test results and progress tracking, Customizable timer settings, Voice-over feature

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full Question Bank | $1.99 | one-time |


### Inference Ace

[App page](https://appshunter.io/ios/app/inference-ace/id866920724)

This app helps children in grades 2-5 improve their reading comprehension by teaching inference skills step-by-step. It uses a game-like environment with over 450 examples and a reward center to keep kids engaged. Detailed reporting is available for up to 10 students.

**Highlights:** Step-by-step inference skill building, Game-like environment with reward center, Over 450 examples designed by teachers, Detailed reporting for multiple students, Incremental learning with unlocked levels, Guided learning for reduced frustration

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Upgrade to 2 Players | $1.99 | one-time |
| Inference Ace: Buy All Levels | $2.99 | one-time |
| Upgrade to 10 Players | $2.99 | one-time |


## Frequently asked questions

### Is Grammar Express free?

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

### Is Inference Ace free?

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

### Which has better reviews, Grammar Express or Inference Ace?

Inference Ace is rated higher. Grammar Express averages 2.0 out of 5 from 1 ratings, while Inference Ace averages 3.5 from 22 ratings.

### Do Grammar Express or Inference Ace have ads?

Neither Grammar Express nor Inference Ace shows ads.

### Which is updated more often, Grammar Express or Inference Ace?

Grammar Express ships an update every 13 months, and Inference Ace every 7 months. Most recently, Grammar Express was updated on November 1, 2026 and Inference Ace 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.*