System Requirements for Day One
This page lists the minimum operating system versions required to run the current version of Day One.
Keeping Day One Up to Date (outdated version, old version, need to update)
Day One uses year-based version numbering. Current versions follow the format 2025.x or 2026.x (for example, 2026.5 or 2026.6). This is the numbering you will see inside the app on iOS, iPadOS, macOS, Android, Windows, and the web.
Important: If your Day One version number is a single or double digit (such as version 7.x, 8.x, or 10.x), your app is significantly outdated. These older versions are no longer supported and may have bugs, crashes, and missing features that have already been fixed. You should update to the latest version from your app store immediately before attempting any troubleshooting.
Exception – the Windows app has a second version number. Day One for Windows is a desktop wrapper around the Day One web app, and the Microsoft Store lists it with its own version number starting with 1, such as 1.0.4 or 1.1.0. That number belongs to the Windows wrapper, not to Day One. A 1.x number on Windows is current and does not mean your app is outdated. The Day One version inside the Windows app is year-based, under File > Settings > Advanced. See Day One for Windows: Getting Started for details.
To update Day One:
- Mac: Check for updates in the Mac App Store
- iOS/iPadOS: Check for updates in the App Store
- Android: Check for updates in the Google Play Store
- Windows: Check for updates in the Microsoft Store
You can find your current version number in Day One under Settings > About (on Windows and the web, File > Settings > Advanced). If that version number is not in the year-based format (2026.x or later), your app needs to be updated. The 1.x number the Microsoft Store shows for Day One for Windows is a separate wrapper version and is not expected to match this format.
iOS and iPadOS
Day One requires iOS 18 or later. Older versions of iOS are not supported and cannot install or update to the current version of Day One.
macOS
Day One requires macOS 15 (Sequoia) or later. Macs that cannot run macOS 15 cannot use the current version of Day One. You can still access your entries through the web app at dayone.me.
Android
Day One requires Android 9 or later. Check the Google Play Store listing for the current minimum version.
Web App
Day One is available at dayone.me and works in all modern browsers including Chrome, Firefox, Safari, and Edge.
Windows
Day One for Windows is available as a desktop app. It required Windows 10 version 14316.0 or higher. Check the download page for current system requirements.
The Microsoft Store lists the Windows app with a 1.x version number (for example, 1.1.0). That is the version of the Windows desktop app itself. Day One inside it, shown under File > Settings > Advanced, uses the year-based 2026.x numbering. A 1.x number in the Microsoft Store is current and does not mean Day One is outdated.
If your device cannot run the current version of Day One, you can access your synced entries through the web app at dayone.me from any modern browser.
