# ぜったい覚える！英検１級単語帳 vs Optical Path

The clearest difference is price: ぜったい覚える！英検１級単語帳 at Free against Optical Path's $1.99. Optical Path's advantage is ads (none vs shown). On update cadence, in-app purchases, device support and iOS requirement there is nothing between them.

ぜったい覚える！英検１級単語帳 is free to download; Optical Path costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ぜったい覚える！英検１級単語帳 ships an update every 21 months, Optical Path every 12 months. The most recent releases landed on September 27, 2026 and October 3, 2026 respectively.

## The numbers

| Metric | ぜったい覚える！英検１級単語帳 | Optical Path |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| Positive reviews | 66.7% of reviews | — |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Every 21 months | **Every 12 months** |
| Size | 70 MB | 6 MB |
| Requires iOS | **15.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Ben Walker](https://appshunter.io/developer/385443776) | [坤 冉](https://appshunter.io/developer/1759927074) |

## What reviewers say

### ぜったい覚える！英検１級単語帳

[App page](https://appshunter.io/ios/app/id1295749587)

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

**In-app purchases:** none


### Optical Path

[App page](https://appshunter.io/ios/app/optical-path/id6670541141)

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

**In-app purchases:** none


## Frequently asked questions

### Is ぜったい覚える！英検１級単語帳 free?

ぜったい覚える！英検１級単語帳 is free to download, with no in-app purchases.

### Is Optical Path free?

Optical Path costs $1.99, with no in-app purchases.

### Do ぜったい覚える！英検１級単語帳 or Optical Path have ads?

ぜったい覚える！英検１級単語帳 shows ads; Optical Path does not.

### Which is updated more often, ぜったい覚える！英検１級単語帳 or Optical Path?

ぜったい覚える！英検１級単語帳 ships an update every 21 months, and Optical Path every 12 months. Most recently, ぜったい覚える！英検１級単語帳 was updated on September 27, 2026 and Optical Path on October 3, 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.*