Hylki
What Hylki is
Hylki is a free, open-source email client for the Linux desktop, built as a GNOME-native application. Its three-pane layout combines accounts in a unified inbox, with unified folders, conversation threading, mail filters, coloured tags and scheduled sending. IMAP IDLE provides push delivery, while OAuth sign-in uses GNOME Online Accounts. GNOME Contacts supplies recipient autocomplete as you type. Hylki supports cloud attachments through Nextcloud, ownCloud, OpenCloud, OneDrive, Dropbox and Seafile. For OpenPGP mail, it can read, sign and encrypt messages through GnuPG on the computer; the maker says decrypted content is never written to disk. The project says it has no telemetry or tracking, blocks remote images by default and stores passwords and tokens in the operating system secret service. Stable Flatpak builds support 64-bit Intel/AMD and ARM Linux, with an RPM package for Fedora 44 and newer on Intel/AMD. Hylki is released under GNU AGPLv3 and is intended for the Linux desktop community.
Who it suits
Hylki suits Linux desktop users who want a GNOME-native client with multiple-account handling, scheduled mail and OpenPGP support. It is also suitable for users seeking an open-source client without telemetry.
What it does well
- Unified inbox and folders across accounts
- Scheduled sending and IMAP IDLE push
- OpenPGP reading, signing and encryption
- Cloud attachments across six services
- No telemetry or tracking
What to know first
- Linux desktop only
- Beta builds may be unstable
- Beta supports Intel/AMD x86_64 only
- No free trial because the plan is already free
Plans
| Plan | Billed and limits | Price |
|---|---|---|
| Hylki | Free and open source · GNU AGPLv3 | Free |
As hylki.hyprlab.co lists them, read 12 Oct 2026. The maker's own page has the final word.
Verdict
Hylki combines GNOME integration, account unification and privacy-focused email features in a free AGPLv3 package. Stable Linux builds cover Intel/AMD and ARM, while beta users face narrower architecture support and possible instability.
Facts from Hylki's own pages
- App coverage
- desktop · hylki.hyprlab.co, 20 Sept 2026
- Beta limit
- Beta builds are Intel/AMD x86_64 only and may be unstable; the beta shares accounts, settings, and cached mail with the stable app. · hylki.hyprlab.co, 12 Oct 2026
- Contacts
- Hylki integrates with GNOME Contacts to autocomplete recipients as you type. · hylki.hyprlab.co, 12 Oct 2026
- Email features
- It supports IMAP IDLE push, unified folders across accounts, conversation threading, mail filters, coloured tags, and scheduled sending. · hylki.hyprlab.co, 12 Oct 2026
- Encryption
- Hylki supports reading, signing, and encrypting OpenPGP mail through GnuPG on the computer, and says decrypted content is never written to disk. · hylki.hyprlab.co, 12 Oct 2026
- Free plan
- Yes · hylki.hyprlab.co, 20 Sept 2026
- Integrations
- It uses GNOME Online Accounts for OAuth sign-in and supports cloud attachments through Nextcloud, ownCloud, OpenCloud, OneDrive, Dropbox, and Seafile. · hylki.hyprlab.co, 12 Oct 2026
- Intended users
- The project says it aims to serve the Linux desktop community with a modern, GNOME-native email client that balances aesthetics and features. · hylki.hyprlab.co, 12 Oct 2026
- Open source
- Hylki is released under the GNU AGPLv3 and the maker says it will remain free and open source. · hylki.hyprlab.co, 12 Oct 2026
- Privacy
- The maker says Hylki has no telemetry or tracking, blocks remote images by default, and stores passwords and tokens in the operating system secret service rather than in plaintext on disk. · hylki.hyprlab.co, 12 Oct 2026
- Product
- Hylki is a fast, GNOME-native email client for the Linux desktop with a three-pane layout, unified inbox, and OAuth account support. · hylki.hyprlab.co, 12 Oct 2026
- Scheduled sending
- Yes · hylki.hyprlab.co, 20 Sept 2026
- Support
- The maker directs users to report bugs or suggest features through GitHub issues and asks them to include the app version, GNOME version, distribution, and reproduction steps. · hylki.hyprlab.co, 12 Oct 2026
- Supported systems
- Stable builds are available for 64-bit Linux on Intel/AMD and ARM through Flatpak; an RPM package is offered for Fedora 44 and newer on Intel/AMD. · hylki.hyprlab.co, 12 Oct 2026
- Unified inbox
- Yes · hylki.hyprlab.co, 20 Sept 2026
Where Hylki stands on Freedom251
- Email clients#77 of 142