# Dictionary vs 逆引記念日

The clearest difference is update cadence: Dictionary at every 3 weeks against 逆引記念日's every 7 months. 逆引記念日's advantage is iOS requirement (12.0 vs 18.0). On price, ads, in-app purchases and device support there is nothing between them.

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

Dictionary ships an update every 3 weeks, 逆引記念日 every 7 months. The most recent releases landed on October 14, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | Dictionary | 逆引記念日 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.0 (5 ratings)](https://appshunter.io/ios/app/dictionary/id473493861/reviews)** | — |
| Number of ratings | **5** | — |
| Positive reviews | 94.0% of reviews | — |
| In-app purchases | No | No |
| Ads | Yes | Yes |
| Update frequency | **Every 3 weeks** | Every 7 months |
| Monetization | Ad-supported | — |
| Size | 28 MB | 21 MB |
| Requires iOS | 18.0 | **12.0** |
| Devices | iPhone, iPad, Apple Watch | **iPhone, iPad, iPod, Apple Watch** |
| Age rating | 12+ | 4+ |
| Developer | [Catalystwo](https://appshunter.io/developer/1651079501) | [Takuya Ishikawa](https://appshunter.io/developer/468311118) |

## What reviewers say

### Dictionary

[App page](https://appshunter.io/ios/app/dictionary/id473493861)

Instantly look up words from your iOS Home Screen without opening the app. Get definitions in seconds to aid studying, reading, or satisfying curiosity, keeping you focused and learning.

**Highlights:** Home Screen widget for instant lookups, No app launch required, Quick definitions, Seamless learning experience, Focus on tasks

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

**In-app purchases:** none


### 逆引記念日

[App page](https://appshunter.io/ios/app/id834965969)

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

**In-app purchases:** none


## Frequently asked questions

### Is Dictionary free?

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

### Is 逆引記念日 free?

逆引記念日 is free to download, with no in-app purchases.

### Do Dictionary or 逆引記念日 have ads?

Both Dictionary and 逆引記念日 show ads.

### Which is updated more often, Dictionary or 逆引記念日?

Dictionary ships an update every 3 weeks, and 逆引記念日 every 7 months. Most recently, Dictionary was updated on October 14, 2026 and 逆引記念日 on October 2, 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.*