# Grammar Flow vs TerraChron 9

Grammar Flow and TerraChron 9 are too close to call on the numbers: across 8 compared parameters — price, rating, ratings volume and ads among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

On the App Store both sit at effectively the same score — 1.0 for Grammar Flow against 1.0 for TerraChron 9. Both are backed by a comparable volume of ratings — 1 and 1 respectively.

## The numbers

| Metric | Grammar Flow | TerraChron 9 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [1.0 (1 ratings)](https://appshunter.io/ios/app/grammar-flow/id6755808637/reviews) | [1.0 (1 ratings)](https://appshunter.io/ios/app/terrachron-9/id6757675735/reviews) |
| Number of ratings | 1 | 1 |
| In-app purchases | No | No |
| Ads | No | No |
| Monetization | Free | Free |
| Size | 18 MB | 19 MB |
| Requires iOS | 13.0 | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Anh Duc Pham](https://appshunter.io/developer/1856497203) | [Kien Le Trung](https://appshunter.io/developer/1868204668) |

## What reviewers say

### Grammar Flow

[App page](https://appshunter.io/ios/app/grammar-flow/id6755808637)

Enhance your English skills with guided lessons, quizzes, and daily challenges. This app offers offline access to improve grammar, reading comprehension, and vocabulary with a clean, user-friendly interface. Track your progress and build confidence in your English abilities anytime.

**Highlights:** Guided grammar lessons, Reading comprehension exercises, Vocabulary building, Quick quizzes, Mixed tests, Daily challenges, Offline functionality

**Features:** macOS Compatibility

**In-app purchases:** none


### TerraChron 9

[App page](https://appshunter.io/ios/app/terrachron-9/id6757675735)

This offline study studio helps Grade 9 students master History and Geography. It features an Atlas for theory, terms, and timelines, guided Studio Runs for practice, and a Review Lab for creating revision cards. Each session concludes with a saved Notebook artifact and a daily check-in.

**Highlights:** Offline study studio, History & Geography curriculum, Interactive Atlas, Guided Studio Runs, Review Lab with Revision Cards, Saved Notebook artifacts

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Grammar Flow free?

Grammar Flow is free to download, with no in-app purchases.

### Is TerraChron 9 free?

TerraChron 9 is free to download, with no in-app purchases.

### Which has better reviews, Grammar Flow or TerraChron 9?

Grammar Flow and TerraChron 9 are both rated 1.0 out of 5 on the App Store, from 1 and 1 ratings respectively.

### Do Grammar Flow or TerraChron 9 have ads?

Neither Grammar Flow nor TerraChron 9 shows ads.

---

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