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Komorebi: Email for Windows. Small, fast and private.
Komorebi is an IMAP email client for Windows 10 and 11. It works with any IMAP and SMTP server, blocks remote content by default, and has no telemetry, no ads and no AI.
BetaClosed sourceDesktop apps
What Komorebi is
Komorebi is a small, fast, privacy-respecting email client for Windows 10 and 11. It speaks IMAP and SMTP, with presets for Purelymail and Postale.io and a guided manual setup for self-hosted mail servers.
There is no telemetry, no advertising and no AI. Passwords are stored in Windows Credential Manager, and remote content is blocked by default.
Komorebi is built with Rust and Slint and keeps a local SQLite cache. In its 0.2.0 beta notes it listed 55,720 cached messages in about 30 ms while using about 9 to 11 MB of private memory. The current version is 0.3.0 beta; it is unsigned and has no installer yet.
Closed source.
This page is an overview; the source code is not public. For access, pricing or questions, write to hello@rusticstack.com.
Features
A small, fast, private email client for Windows
Any IMAP and SMTP server
Presets for Purelymail and Postale.io, plus manual setup for self-hosted mail with guided DNS lookup, a connection test and certificate review.
All your inboxes
Multiple accounts, with a combined All inboxes view.
Private by default
No telemetry, no ads, no AI. Passwords live in Windows Credential Manager and remote content is blocked by default.
Fast and light
Measured in the 0.2.0 beta: 55,720 cached messages listed in about 30 ms, in about 9 to 11 MB of private memory.
Undo send
Change your mind after pressing Send.
Native look, two languages
A Fluent, WinUI 3 style interface, in English and European Portuguese.
Specifications
| Status | Beta |
|---|---|
| Licence | Closed source |
| Source | Closed source |
| Platforms | Windows 10, Windows 11 |
| Built with | Rust, Slint, SQLite |
| Links |
Questions about Komorebi
Which versions of Windows does Komorebi run on?
Komorebi runs on Windows 10 and Windows 11.
Does Komorebi work with my email provider or my own mail server?
Komorebi works with any IMAP and SMTP server. It has presets for Purelymail and Postale.io. For self-hosted mail there is a manual setup with guided DNS lookup, a connection test and certificate review.
Does Komorebi collect telemetry, show ads or use AI?
No. Komorebi has no telemetry, no advertising and no AI.
Where does Komorebi store my email password?
Passwords are stored in Windows Credential Manager.
Does Komorebi load remote images in emails?
Remote content is blocked by default.
Can I use more than one email account?
Yes. Komorebi supports multiple accounts and has a combined All inboxes view.
How fast and light is Komorebi?
Komorebi is built with Rust and Slint and keeps a local SQLite cache. The 0.2.0 beta notes measured 55,720 cached messages listed in about 30 ms, using about 9 to 11 MB of private memory.
How do I get Komorebi, and is there an installer?
Komorebi is in beta (version 0.3.0). It is unsigned and has no installer yet. To join the beta, email hello@rusticstack.com with the subject "Komorebi beta". It is closed source, and its interface is in English and European Portuguese.
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