# D vs TERRACE

The clearest difference is update cadence: TERRACE at every 3 months against D's every 20 months. TERRACE also leads on review sentiment (33% vs 20%). D's advantage is iOS requirement (10.0 vs 12.0). On price, ads, in-app purchases and monetization model there is nothing between them.

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

D ships an update every 20 months, TERRACE every 3 months. The most recent releases landed on October 2, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | D | TERRACE |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 20.0% of reviews | **33.3% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 20 months | **Every 3 months** |
| Monetization | Free | Free |
| Size | 5 MB | 1.5 GB |
| Requires iOS | **10.0** | 12.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [WITH US CORPORATION](https://appshunter.io/developer/1456557806) | [SRJ](https://appshunter.io/developer/794881876) |

## What reviewers say

### D

[App page](https://appshunter.io/ios/app/d-file/id1456557807)

Visualize your personal growth and development with a digital map. Track your progress, gain a sense of accomplishment, and receive feedback to understand your achievements. Connect to an e-portfolio to record your growth history.

**Highlights:** Digital growth map, Growth visualization with graphs, Daily reflection and feedback, Set future self goals, Connect to e-portfolio

**Features:** macOS Compatibility

**In-app purchases:** none


### TERRACE

[App page](https://appshunter.io/ios/app/terrace/id1491312678)

This app is a self-directed learning platform designed to enhance five key abilities: speed reading, comprehension, critical thinking, English proficiency, and expression. It offers personalized training modules for each skill, requiring a contract and registration to access. The platform is exclusively for registered users of contracted schools and businesses.

**Highlights:** Speed reading and comprehension training, Mathematical thinking development, Speed reading and listening English courses, New Japanese language courses, Real-world problem-solving lessons, Personalized learning paths

**In-app purchases:** none


## Frequently asked questions

### Is D free?

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

### Is TERRACE free?

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

### Do D or TERRACE have ads?

Neither D nor TERRACE shows ads.

### Which is updated more often, D or TERRACE?

D ships an update every 20 months, and TERRACE every 3 months. Most recently, D was updated on October 2, 2026 and TERRACE on October 9, 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.*