Perpetual Calendar

Perpetual Calendar is an offline calendar and simple event planner. Add events with date & time, see countdowns, and keep your data safe with backup.

Features

• Offline—no sign-in required

• Add, edit, delete events with notes and optional image

• Countdown timer and “time’s up” alert

• Month calendar with dots for days that have events

• “All events” list with search and advanced filters (title, note, date, has image)

• Quick filters: Today, Weekend, This week, Good day, Due in < 24h

• Sort by: Nearest, Farthest, Name

• Backup & restore: JSON/CSV + ZIP images; share file

• PIN lock in Settings

• Multi-language (EN/ZH/FR/ID/JA/KO/RU/ES/TH/VI)

• Google banner ad at the bottom