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 with a free plan
6 apps
6 apps that APP NAVI confirmed from official sources to have a free plan. 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 →
CryptPad
Web Services & Online Tools
An end-to-end encrypted, open-source collaborative office suite with documents, spreadsheets, forms and kanban boards. It can be self-hosted.
Free plan
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
Healthchecks.io
Web Services & Online Tools
A monitoring service for cron jobs and other scheduled tasks. It alerts you when a job's ping arrives late or not at all, and the official site says 20 jobs can be monitored for free.
Free plan
ntfy
Web Services & Online Tools
An HTTP-based pub-sub notification service that sends push notifications to phones and desktops via PUT/POST. It can be used without sign-up and is open source.
Free planIndie
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