An offline-first desktop writing app for novelists and world-builders. Your manuscripts live on your machine — private, always available.
Windows 10 or later · 64-bit
Recommended: Installer (.exe) for most users. MSI for enterprise/managed deployments.
Ubuntu 20.04+ · Debian · x86_64
Recommended: DEB for Ubuntu/Debian. RPM for Fedora/RHEL.
Coming soon
macOS support is on the roadmap.
Mythos stores everything locally. No cloud required, no account needed. Your manuscripts never leave your computer unless you choose to sync.
Write on a plane, in a cabin, or anywhere without internet. Every feature works fully offline — no sync required to use the app.
The app checks for updates in the background and installs them the next time you restart. You're always on the latest version without lifting a finger.
| OS | Windows 10 or later (64-bit) |
| RAM | 4 GB minimum, 8 GB recommended |
| Disk | 200 MB free space |
| WebView | WebView2 (auto-installed if missing) |
| OS | Ubuntu 20.04+, Debian 11+, or equivalent |
| RAM | 4 GB minimum, 8 GB recommended |
| Disk | 200 MB free space |
| Libraries | WebKit2GTK 4.1, libappindicator3 |
No account needed for the desktop app. Everything you need to write is included for free.
Want cloud sync, PDF/EPUB export, and web access? See Pro plan →
No account. No subscription. Just open the app and write.