Fever symptom tracking apps in Japan show weak local competition
Japan — Medical, for consumers. Niche: Fever Symptom Tracker.
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
- Medium, neither for nor against you
- 24,382 ratings
- Revenue
- Medium, neither for nor against you
- 1 top-grossing
- Competition
- Low, in your favour
- 0 established in Japan
- Leading apps
- Weak, in your favour
- 2★ average
How the score of 58 is made
score out of 100
- Demand48
24,380 ratings in the US and UK, 2 in Japan
- Revenue36
1 of the top 3 on a top-grossing chart in the last 30 days; 1 paid
- Room locally100
0 established apps 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 weakness100
2 stars on average; 1 of 3 not updated in a year
- AI gap30
3 of the top 3 not built around AI
- Momentum—
History building since 19 Oct 2026 — counted as neutral (50) for now
Why this is an opening
The highest local rating count in Japan is 2, while top reference markets reach 24380. A total of 1 app is considered stale, representing 100 percent of the evaluated set. All 3 top search results are non-native apps.
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 |
|---|---|---|---|---|---|---|
| Feevy – Fever Tracker | 2 | 35 | 2 | No | Sept 2018 | No AI |
| Body Temperature App For FeverNot in this store | 0 | 24,345 | 4.7 | Yes | Oct 2026 | No AI |
| BTMon PlusNot in this store | 0 | 0 | — | No | Jun 2025 | 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
Too few low-star reviews to group into complaints yet.
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 | 58 | Not yet |
| Members | 57 | Not yet |
| Members | 57 | Not yet |
| Members | 56 | Not yet |
| Members | 56 | Not yet |
| Members | 56 | Not yet |
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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.