Daily Vocabulary Builder Apps in Japan
Japan — Education, for consumers. Niche: Daily Vocabulary Builder.
Data from the week of 19 Oct 2026, refreshed every two weeks.
Our call
out of 100
We have not checked this against App Store search in Japan yet, so we won’t call it. Checks run every day, highest-scoring openings first.
At a glance
- Demand
- High, in your favour
- 249,639 ratings
- Revenue
- Medium, neither for nor against you
- 2 top-grossing
- Competition
- Low, in your favour
- 1 established in Japan
- Leading apps
- Strong, against you
- 4.6★ average
How the score of 60 is made
score out of 100
- Demand77
248,784 ratings in the US and UK, 855 in Japan
- Revenue36
2 of the top 2 on a top-grossing chart in the last 30 days; 0 paid
- Room locally88
1 established app in Japan (75+ ratings, scaled to the market’s size)
- Language gap50
Not checked in local search yet — counted as neutral (50) at most
- Incumbent weakness30
4.6 stars on average; 0 of 2 not updated in a year; includes a review signal (members)
- AI gap30
2 of the top 2 not built around AI
- Momentum—
History building since 19 Oct 2026 — counted as neutral (50) for now
Why this is an opening
The top app in Japan has 855 local ratings, compared to 248784 ratings for the top app in the United States reference market. Demand is strong with a score of 77, and local gap is rated at 50. In Japan, 2 top apps are non-native and 1 top app lacks local language support.
What people in Japan see
Not yet checked against local App Store search. Checks run every day, highest-scoring openings first.
How strong the competition is
The leading apps in this niche
The niche’s apps available in Japan, ranked by their share of ratings here and in the United States and United Kingdom; stars in Japan where it has them.
| App | Ratings in Japan | Ratings US + UK | Stars | Japanese | Last update | AI |
|---|---|---|---|---|---|---|
| Vocabulary - Learn words daily | 855 | 237,933 | 4.6 | No | Oct 2026 | No AI |
| WordPal - Vocabulary BuilderNot in this store | 0 | 10,851 | 4.7 | No | Oct 2026 | No AI |
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Is demand growing
New ratings each week in Japan, added up over the leading apps. A rating count only grows, so a week’s rise is the people who rated that week.
- Last 4 weeks
- 4 weeks before
- Earlier
Members see the weekly trend.
Show as a table
| Week | New ratings |
|---|---|
| Members | — |
What users complain about
- Unexpected charges and paywalls after setup28 reviews
Show as a table
| Complaint | Reviews |
|---|---|
| Unexpected charges and paywalls after setup | 28 |
See every complaint and the reviews behind them.Get 30 days — €19 →
If you build it
The smallest app that answers what users complain about and what the leaders leave out. Each feature says where it comes from.
- What apps here chargethe leading apps' in-app prices, once we have read themMembers
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What would kill this
Up to three things that would end this opening, each tied to the data.Get 30 days — €19 →
The same niche in other markets
- This market
- Other markets
✓ checked against local App Store search. Other markets are named for members.
Show as a table
| Market | Score | Checked against local search |
|---|---|---|
| Japan | 60 | Not yet |
| Members | 60 | Not yet |
| Members | 60 | Not yet |
| Members | 60 | Not yet |
| Members | 60 | Not yet |
| Members | 59 | Not yet |
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| Members | 58 | Not yet |
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| Members | 57 | Not yet |
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| Members | 56 | Not yet |
| Members | 56 | Not yet |
| Members | 54 | Not yet |
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| Members | 54 | Not yet |
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| Members | 53 | Not yet |
| Members | 53 | Not yet |
| Members | 34 | Yes |
| Members | 33 | Yes |
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Scored 2026-10-26 with score version 4. How the score works. Store data only: we do not estimate revenue or downloads.