Top Developer Tools apps in Japan 🇯🇵
As of May 21, 2026, TestFlight is the #1 Developer Tools app in Japan on iOS.
iOSAndroid
#App / PublisherCategoryIntel
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開発ツール - 144
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開発ツール - 314
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What changed
Movement between the previous day and May 21, 2026.
New entrants
Risers
- BOYA Notra
#90 → #39
- N8N Automations — Nathan
#89 → #46
HTML Creator : Editor & Viewer#88 → #55
- Rev for Vercel
#55 → #38
OpenCode Mobile App#78 → #64
Fallers
Jamy-#43 → #71
HTML Viewer: View Source#64 → #90
WebView - Tester#69 → #95
ストアイメージ作成 | モックアップ画像 | フレーム合成#32 → #57
Spectre VPN#49 → #74
Methodology
Rankings are pulled daily from the iOS store charts for Japan. We snapshot the top entries each day and compute day-over-day change relative to the prior snapshot. See our full methodology for data sources, refresh cadences, and quality filters.
Frequently asked questions
What is the #1 Developer Tools app in Japan on iOS?
As of May 21, 2026, TestFlight is the #1 Developer Tools app in Japan on iOS, based on the public iOS chart rankings Marlvel tracks daily.
How often are these rankings updated?
Marlvel snapshots the iOS charts for Japan every day and computes day-over-day movement. The "Current" page always reflects the latest snapshot; dated archive pages preserve each day's top 50.
Where does Marlvel's ranking data come from?
Rankings are pulled from the public iOS store charts for Japan. See our methodology for data sources, refresh cadence, and the quality filters applied before a ranking is indexed.