Tools
Handy tools you can use without logging in. What you type is processed in your browser and is mostly never sent to the server.
No matching tool.
Date & time
Age & Date Calculator
Korean legal age, D-day, 100-day and yearly anniversaries, the span between two dates, N days or months later, and business days excluding holidays.
Lunar Calendar
Convert between solar and lunar dates, browse a lunar calendar with leap months, sexagenary names, solar terms and holidays, and find the solar dates of lunar anniversaries.
Timer, Stopwatch & Pomodoro
A countdown timer, a stopwatch with laps, and a 25/5 Pomodoro. It rings and notifies when time is up, and the remaining time shows in the tab title.
Time Zones & World Clock
See the current time in many cities at a glance, and convert a meeting time to other time zones. Daylight saving time is handled automatically.
Weekly Timetable
Build a weekly timetable from day and time blocks, save it as an image (PNG), or turn it into a weekly repeating calendar file (.ics) for Google or Apple Calendar with holidays skipped.
Weather & air quality
See the current weather, a 5-day forecast and particulate matter (PM2.5 / PM10) for major cities or places you saved.
Use offline too
When turned on, tool pages and the files they need are saved on this device so the calculation and conversion tools work without internet. You can also install just the tools on your home screen.
Saving needs a few MB after you turn it on (large tools add more when used). Login information is never saved, and you can turn it off any time. Tools that need the server, such as the QR maker, web page checker, My IP and secret notes, do not work offline.