Stopwatch (stopwatch.onl.jp)
A stopwatch web app with lap time recording. Useful for sports practice, task timing, and many other purposes — ready to use instantly without any installation.
Subtraction Challenge (minus.onl.jp)
A math practice web app where you solve subtraction problems within a time limit. Great for improving children's arithmetic skills or as a brain workout for adults, with score recording.
Text Diff (diff.onl.jp)
A web tool to visually compare two pieces of text and highlight their differences. Additions, deletions, and changes are color-coded for quick review of what has changed.
Text-to-Speech Web (speak.onl.jp)
A text-to-speech (TTS) web tool that reads aloud any text you enter. Adjust speed and voice type, and use it for foreign language listening practice.
Timer (timer.onl.jp)
A countdown timer web app that sounds an alarm at the specified time. Useful for managing cooking, study, and work sessions, with support for setting multiple timers.
Trading Card Battle Web (cardgame.onl.jp)
A web game to battle using original cards created with the Trading Card Creator tool. Play against friends or challenge an AI opponent in your browser.
Trading Card Creator (card.onl.jp)
A web app to design and create original trading cards in the browser. Upload images and add text to produce unique cards for personal or hobby use.
Translation Web (tran.onl.jp)
A web tool to translate text between Japanese, English, and many other languages. Translate easily in the browser for business documents and language learning.
Trend Web (trend.onl.jp)
A web service to check trending keywords on social media and the web in real time. Quickly browse what topics are currently being talked about.
URL Encoder (urlenc.onl.jp)
A web tool for easy URL encoding and decoding in the browser. Useful for converting and verifying URLs that contain Japanese characters or special symbols.
Vision Check Web (eye.onl.jp)
A web tool for a quick vision self-check in the browser using Landolt C optotype symbols. Useful as a preliminary check before an eye exam.
Voice Recorder Web (voice.onl.jp)
A voice recorder web app that lets you record, play back, and download audio using your browser's microphone. Perfect for capturing meeting notes and ideas without installing any app.
