DCalendar: Private Calendar

Name: DCalendar: Private Calendar
Author: NCOG

Android app by NCOG. Productivity · NCOG

Store rating: Unknown
Store rating count: Unknown
Download price: Free to download
In-app purchases: Not listed in captured metadata
Version: 1.0.0
Listing last refreshed: 2026-09-18

Store description excerpt

DCalendar is a calendar that keeps the details of your plans to yourself. Every event body is encrypted on your phone before it is sent anywhere, under a key only your NCOG Wallet can unwrap. There is no password to set, and none for anyone to steal. It is also a calendar you can run your week from: Day, Week, Month and Schedule views, tasks that tick off, repeating events, all-day events, and a real Google Meet or Zoom link on the events that need one. Swipe between periods, jump to a date, or search titles, locations and guests. You need the NCOG Wallet app Signing in opens NCOG Wallet and asks you to approve. The wallet holds your keys, which is what makes the passwordless sign-in and the encryption work: it unwraps the key to your calendar and signs every event you save. Install it first, or DCalendar cannot get past the sign-in screen. Events, tasks and time off - All-day events, and a timezone per event from 77 major zones - Repeats: daily, weekly, chosen weekdays, fortnightly, monthly, monthly on the nth or last weekday, yearly, weekdays only, or a custom every-N rule - Invite guests by email or straight from your dContacts address book. They get a standard .ics attachment that opens in any calendar. Repeating events are invited one date at a time - Tasks with their own dates, times and repeat rules, ticked off in one tap - Out of office entries for the days you are away, shown on your own calendar - A recycle bin: restore one, restore all, or delete for good Google Meet and Zoom Connect a Google or Zoom account in Settings, then choose Meet or Zoom on an event: DCalendar creates the real meeting, updates it when you move the event and cancels it when you delete. Meet needs Google Play services. Google Meet and Zoom are trademarks of their owners; DCalendar is not affiliated with either. What is encrypted, and what is not The body of every event is encrypted on your phone before it is sent anywhere: description, location, guest list, meeting link, repeat rule and timezone. The key is a data key of your own, sealed to your ML-KEM public key. NCOG's server only ever holds it sealed; it is unwrapped inside your NCOG Wallet, and DCalendar keeps the unwrapped copy in memory rather than writing it to storage. A decrypted copy of your calendar is cached on the device so it opens instantly. Sign-in is an ML-DSA-87 signature over a single-use challenge. ML-KEM and ML-DSA are post-quantum algorithms standardized by NIST. Not encrypted: the event title, its start and end times, its id and invitee email addresses. Those go to the NCOG blockchain, signed by your own wallet, as a permanent public record - anyone who knows your NCOG username can read them. Times and repeat rules also reach the NCOG server in the clear. Invitations are ordinary email with a plain .ics attachment, readable by our relay and by any mail server it passes through. If a title would be sensitive on a permanent public record, put the detail in the description instead.

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