Koyomi Yomi Downloads & RevenueKoyomi Yomi · App Store

KoyomiYomi is a Japanese calendar app that beautifully and clearly displays Japan's traditional calendar system.

What year is it in Reiwa? What is this year's zodiac animal? Whenever you wonder about Japan's traditional calendar, just open the app and find out instantly.

◆ Era & Zodiac Tab

Intuitively check the correspondence between the Western calendar and the Japanese era calendar.

・Tap the left/right arrows to change the year — the matching Japanese era and zodiac update automatically
・Wide range support, from Meiji (1868) through Reiwa, all the way to 2100
・"First year" notation supported (e.g., "Reiwa Gannen" instead of "Reiwa 1")
・Charming illustrations of all twelve zodiac animals make it visually delightful

【Japanese Era List】
Tap the ⓘ button to browse every era from Keio to Reiwa. View the reading, Western year range, duration, and the name of the reigning emperor for each era — perfect for studying Japanese history.

【Twelve Zodiac List】
Rat, Ox, Tiger… see all twelve zodiac signs at a glance, complete with kanji, readings, animal names, and illustrations. Handy whenever you want to check the order of the zodiac.

◆ Calendar Tab

A monthly calendar with Japanese era display lets you manage your schedule while feeling Japan's traditional calendar.

・Monthly grid view (Sunday start)
・Japanese era (e.g., "Reiwa 8") always shown at the top
・Sundays and national holidays in red, Saturdays in blue
・Japanese national holidays automatically detected and displayed
・Today's date highlighted in your accent color

【Apple Calendar Integration】
Your Apple Calendar events are displayed right in the app. Each day shows event names with color bars, and today's events appear in a dedicated section.

・Long-press a date to open the Apple Calendar app
・Choose your sync preference: all calendars / Apple only / Google only / no sync

【Era Conversion】
The ⓘ button gives you access to the "Era Conversion" feature. See at a glance which year a given Western year corresponds to in each era. Instantly answer questions like "What year would this be in Showa?" or "What about Taisho?"

◆ Widget Support

Display Japanese era, zodiac, and calendar information on your home screen at all times.

【Small】Japanese era, month/day, weekday, and zodiac illustration
【Medium】Date information plus a large zodiac illustration
【Large】Japanese era + mini monthly calendar + today's events (up to 3)

Widgets automatically sync with the app's color theme — change the theme and the widget colors change with it.

◆ 7 Japanese-Inspired Color Themes

Customize the look with seven themes inspired by traditional Japanese colors.

・White — Clean and minimal white base
・Aizome (Indigo) — Deep indigo dark theme
・Matcha — Calming green Japanese theme
・Sakura (Cherry Blossom) — Elegant pink spring theme
・Sumi (Ink) — Simple monochrome
・Shu (Vermilion) — Warm red dark theme
・Shion (Aster) — Refined purple theme

◆ Text Display Modes

Switch between display modes to suit your reading style.