Korean everyday widgets: couple D-Day, fine dust, payday

These 10 widgets are designed around everyday life in Korea. They're all free and available in Korean, English, Japanese and Chinese.

Couple D-Day

• The first day counts as day 1 (D+1), the Korean way, so day 100 is 99 days after the first day. Switch to “First day = day 0” under Counting if you prefer.
• Milestones: every 100 days up to 1,000, then every 1,000 days, plus each anniversary. If you started on Feb 29, the anniversary falls on Feb 28 in common years.
• Until you pick a date, a sample date is shown with a “Sample” label.

Fine Dust · PM2.5

• Data comes from the Open-Meteo air quality API. These are model estimates from the EU's CAMS atmosphere model, so they can differ from monitoring stations — the widget always says so.
• Grades use the current hourly value. The standards themselves are defined on 24-hour averages, so treat the grade as a guide.

Standard	PM2.5 (µg/m³)	PM10 (µg/m³)
Korea (Ministry of Environment)	Good ≤15 · Moderate ≤35 · Bad ≤75 · Very bad above	Good ≤30 · Moderate ≤80 · Bad ≤150 · Very bad above
China HJ 633-2012	≤35 · ≤75 · ≤115 · ≤150 · ≤250 · above (6 levels)	≤50 · ≤150 · ≤250 · ≤350 · ≤420 · above
Japan	Environmental standard (daily 35) and advisory guideline (daily 70)	Not graded (value only)
US EPA AQI (2024 revision)	≤9.0 · ≤35.4 · ≤55.4 · ≤125.4 · ≤225.4 · above	≤54 · ≤154 · ≤254 · ≤354 · ≤424 · above

• By default the standard matches your language: Korea for Korean, Japan for Japanese, China for Simplified Chinese and the US EPA otherwise.
• Cities from the list are looked up by coordinates; for “Other city” the location is found the same way as in the weather widgets.

What to Wear by Temperature

• Follows Korea's popular temperature-to-outfit chart (sleeveless above 28°C … puffer jackets at 4°C and below). It's a rule of thumb, not an official guide.
• Pick current temperature, feels-like or today's high. A swing of 10°C or more adds a “bring a layer” tip; a 50%+ chance of rain adds an umbrella tip. Weather: Open-Meteo forecast.

Clock-out & Payday

• If payday lands on a weekend or public holiday, it moves to the previous workday by default (the most common rule in Korea and Japan). You can push it to the next workday or leave it as is.
• Holidays use the same data as the holiday widgets — announced days only; make-up workdays in mainland China and Taiwan count as workdays. If holidays can't be loaded, the widget says it's counting weekends only.

Korean Age Calculator

• Since June 28, 2023, Korean law uses international age (man-nai). Some laws, such as military service and youth protection, still use year age (this year − birth year).
• The old Korean counting age (year age + 1) is shown for reference and can be turned off.
• People born on Feb 29 turn a year older on Mar 1 in common years (Korean Civil Act, Article 160).

Study Time

• Uses your focus sessions in the focus space for today's study time, this week's total (from Monday) and your streak. Widgets are public, so only numbers are shown. Enter your own exam name and date for the D-Day.

Korean Word of the Day

• 41 native Korean words (sun-urimal), one a day. Only words found in the Standard Korean Language Dictionary (old or dialect words are marked), with meanings written in our own words and example sentences written by WidgetStore. Popular “pretty Korean words” that aren't in the dictionary are left out.

Zodiac Animal Daily Tip

• Just for fun: one of 36 light-hearted tips written by WidgetStore, picked by date and animal — not fortune-telling. Birth years are calendar years; if you were born before Lunar New Year, your animal may be the previous one.

MBTI Card

• Shows the type you choose — not an official assessment. The one-line traits are written by WidgetStore. MBTI is a trademark of The Myers-Briggs Company.

Lotto Number Picker

• Random numbers only — not winning numbers, and they don't improve your odds. No draw results are shown. A new set appears every day; “Draw again” re-draws only in your browser and isn't saved. In Korea, Lotto 6/45 tickets are for ages 19 and up.