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.
Speed Check (speed.onl.jp)
A web tool to easily measure your internet connection's download and upload speeds in the browser. Useful for checking connection quality and comparing ISP performance.
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.
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.
Desu/Masu Converter (tone.onl.jp)
A web tool to convert Japanese text between polite (desu/masu) form and plain form. Useful for unifying the writing style of business documents and blog articles.
Bill Splitter (warikan.onl.jp)
A web tool to equally split dining or party expenses among multiple people. Instantly calculates the amount per person including rounding, reducing the burden on the organizer.
Analog Clock (watch.onl.jp)
A web app that displays an analog clock in the browser. Shows the current time with a simple, clean design that can also be used as an ambient display piece.
Excel Table to Text Tool (atl2.net)
A tool that converts Excel tables into plain text format suitable for pasting into emails. Supports 3-digit number separators, right alignment, and grid line display options. All processing is done client-side.
Price per 100g Comparison Tool (saruwakakun.com)
A unit price comparison tool that calculates the cost per 100g for multiple products and highlights the best deal. Handy for comparing different sizes or refill vs. regular packs at the supermarket.
BMI Calculator (saruwakakun.com)
A BMI calculator that takes height and weight as input and rates your result across five levels from underweight to obese. Also shows your ideal weight and the gap to reach it.
Gas Cost Calculator (saruwakakun.com)
A fuel cost calculator that estimates the gasoline expense for a drive based on fuel price, travel distance, and fuel efficiency. Includes tips on finding each value.
Discount Price Calculator (saruwakakun.com)
A discount price calculator that instantly computes the final price from the original price and a discount rate. Save multiple results to check the total discounted amount.
