Four Pillars of Destiny (destiny.onl.jp)
A web app for fortune-telling based on the Four Pillars of Destiny (Shichusuimei / Ba-Zi) using birth date and time. Easily check personality and fortune through this traditional East Asian divination method.
Dice Web (dice.onl.jp)
A web tool to roll dice in the browser. Roll one or multiple dice at a time, great for board games, tabletop RPGs, and other activities.
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.
Digital Clock (digital.onl.jp)
A web app that displays a large, easy-to-read digital clock in the browser. Ideal for displaying the time on screen during presentations, classes, and events, with full-screen support.
Division Challenge (divided.onl.jp)
A math practice web app where you solve division problems within a time limit. Great for improving children's arithmetic skills or as a brain workout for adults, with score tracking.
HTML Entities (entity.onl.jp)
A web tool to look up and search HTML entities (such as &, <, etc.). Useful for converting characters to HTML entities and investigating special characters.
Event Memo (evtmemo.onl.jp)
A web app to register and manage event information such as concerts and matches with date, location, and notes. Keep track of your favorite events without forgetting.
Excel to HTML Converter (excel.onl.jp)
A web tool that converts Excel files to HTML tables simply by uploading them. Output Excel data in a format ready to embed directly in web pages.
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.
File Web (file.onl.jp)
A web app for uploading and sharing files directly in the browser. Share files effortlessly by simply sending a URL — no account registration required.
FIRE Calculator (fire.onl.jp)
A web tool to calculate the assets and time needed to achieve FIRE (Financial Independence, Retire Early) by entering current assets, monthly cash flow, and target amount. Simulations based on the 4% rule.
Calligraphy Web (font.onl.jp)
A web tool to display and output text in a Japanese calligraphy (mouhitsu) brush font style. Useful for creating templates for noshi envelopes, New Year's cards, and calligraphy practice.
