AtCoder Problems
Web Services & Online Tools
A web app that helps AtCoder users solve problems and manage their progress, under the tagline 'Extend your AtCoder'.
Free planJapanese UIIndie
Web Services & Online Tools: apps that support Japanese
8 apps
8 apps that APP NAVI confirmed from official sources to support Japanese. Last checked: 2026-11-05. Anything we could not confirm stays "Unverified"; we never guess. Prices and specs change, so check each app's official page before you use it.
Web Services & Online Tools — see all apps →
CMAN インターネットサービス
Web Services & Online Tools
A site for IT engineers and web creators with tools such as server monitoring, QR code generation, an .htaccess generator and image editing. Almost all services are described as free.
Japanese UI
Gyazo
Web Services & Online Tools
A capture tool for screenshots and video that creates a shareable URL right away. It offers shortcut capture, OCR search, tags and collections.
Free planAIJapanese UI
UGTOP
Web Services & Online Tools
A Japanese-language site that publishes tools such as the "Kakunin-kun" environment checker. Its copyright notice reads "1997- ugtop".
Japanese UI
Vivliostyle
Web Services & Online Tools
An open-source CSS typesetting project for digital and web publishing. The site is available in Japanese and English, and a CLI is provided.
Japanese UI
Zenn
Web Services & Online Tools
A knowledge-sharing community for engineers where users can publish articles and books. Its tagline is 'Write for yourself.'
Japanese UI
アサリツールズ (Asari Tools)
Web Services & Online Tools
A free collection of web tools for streamlining web work, including text formatting, image conversion and SEO analysis, run by Studio Asari LLC in Nagoya.
Free planJapanese UI
青空文庫
Web Services & Online Tools
An online digital library in Japanese. Works can be browsed by author and title, and usage rules are explained on the site.
Japanese UI