Day0

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Content rating
Everyone
0+
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Content rating
Everyone
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About this app

Day0 is a diary that only you will ever read.

Log the moments that matter: who they were about, when they happened, and a note only you need to understand. By default everything stays on your phone. If you want the same records on another device, turn on optional sync: it is end-to-end encrypted with a key only you hold, so no one else can read what you wrote.

What's inside:
• Log a moment in a few taps, or let the built-in timer keep the record for you
• Build a quiet profile for each character you care about: birthday, aliases, your own notes
• Keep track of the things you've collected, and watch the cost of each use settle over time
• Review your history as calendars, timelines, and monthly look-backs
• Lock the app behind your fingerprint, face, or a local passcode; private notes are encrypted on the device
• Nine hand-tuned themes, a quiet mascot, and achievements that never nag
• Encrypted backups you control, exported as a single password-protected file

There's no streak to keep, no leaderboard, no nudging. Write as much or as little as you want. Day0 keeps the record, quietly.
A private diary that stays on your phone. Optional encrypted sync.
Updated on
Sep 18, 2026

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
  • No data shared with third parties
    Learn more about how developers declare sharing
  • This app may collect these data types
    Location, Personal info and 2 others
  • Data is encrypted in transit
  • You can request that data be deleted

What’s new

Fixed a batch of issues that got in the way:
• The "Turn on App Protection" entry points wouldn't open
• At the largest text size, the mood picker was out of reach
• Traditional characters slipped into the Simplified interface
• The last row on each tab sat under the floating bar

The interface got a pass too: card corners and surfaces are consistent everywhere, list chevrons no longer vary screen to screen, and the selected filter is finally obvious.
Content rating
Everyone
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App support

About the developer
Marque & Crown Inc.
contact@marquecrown.com
2967 Dundas St W 474B Toronto, ON M6P 1Z2 Canada
+1 916-436-7071