# E.J.C Science&Tech Dictionary vs Luminous E

The clearest difference is price: Luminous E at Free against E.J.C Science&Tech Dictionary's $3.99. Luminous E also leads on update cadence (every 5 weeks vs every 13 months) and review sentiment (24% vs 0%). E.J.C Science&Tech Dictionary's advantage is in-app purchases (none vs 1). On ads and device support there is nothing between them.

Luminous E is free to download; E.J.C Science&Tech Dictionary costs $3.99 up front. Luminous E sells 1 one-off in-app purchase. E.J.C Science&Tech Dictionary asks for nothing beyond the download.

E.J.C Science&Tech Dictionary ships an update every 13 months, Luminous E every 5 weeks. The most recent releases landed on October 12, 2026 and September 21, 2026 respectively.

## The numbers

| Metric | E.J.C Science&Tech Dictionary | Luminous E |
| --- | --- | --- |
| Price | $3.99 | **Free** |
| Rating | — | **[4.0 (6 ratings)](https://appshunter.io/ios/app/luminous-e-j-dictionary/id600480308/reviews)** |
| Number of ratings | — | **6** |
| Positive reviews | 0.0% of reviews | **23.5% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 13 months | **Every 5 weeks** |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 67 MB | 1021 MB |
| Requires iOS | 15.6 | **12.0** |
| Devices | iPhone, iPad, iPod | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 12+ |
| Developer | [AOBO Co.,Ltd](https://appshunter.io/developer/310846199) | [English Channel, Inc.](https://appshunter.io/developer/597837764) |

## What reviewers say

### E.J.C Science&Tech Dictionary

[App page](https://appshunter.io/ios/app/ejc-science-and-tech-dictionary/id363371011)

This application provides a quick reference for scientific and technical terms in English, Japanese, and Chinese. It offers offline access to a large database of words, allowing for fast lookups and easy navigation through search history and bookmarks.

**Highlights:** Offline dictionary access, English, Japanese, Chinese terms, Search by prefix or partial match, Bookmark and history functions, Quick word lookups, Large word database

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

**In-app purchases:** none


### Luminous E

[App page](https://appshunter.io/ios/app/luminous-e-j-dictionary/id600480308)

This comprehensive English-Japanese and Japanese-English dictionary app offers extensive vocabulary and grammar explanations. It includes audio pronunciations, search functionalities, and export options, making it a powerful tool for all English learners.

**Highlights:** Extensive vocabulary (approx. 100,000 entries each), Audio pronunciations for words, Incremental search and spelling suggestions, Bookmark with notes, Export definitions and bookmarks, Daily vocabulary notifications, iPad multitasking and Drag & Drop support

**Features:** Family Sharing, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Luminous activation | $14.99 | one-time |


## Frequently asked questions

### Is E.J.C Science&Tech Dictionary free?

E.J.C Science&Tech Dictionary costs $3.99, with no in-app purchases.

### Is Luminous E free?

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

### Do E.J.C Science&Tech Dictionary or Luminous E have ads?

Neither E.J.C Science&Tech Dictionary nor Luminous E shows ads.

### Which is updated more often, E.J.C Science&Tech Dictionary or Luminous E?

E.J.C Science&Tech Dictionary ships an update every 13 months, and Luminous E every 5 weeks. Most recently, E.J.C Science&Tech Dictionary was updated on October 12, 2026 and Luminous E on September 21, 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.*