Flectar Mail
by Flectar Mail
What Flectar Mail is
Flectar Mail is a free, open-source email client written in Rust for fast startup and low memory use. It offers a unified inbox, offline access, and calendar tools, connecting Gmail, Google Calendar, Google Contacts, Outlook, and Microsoft 365 mail, calendars, and contacts. It also supports IMAP, SMTP, JMAP, CalDAV, CardDAV, and WebDAV, including self-hosted services. Mail and calendar data are stored locally for offline use. Users can browse JMAP and WebDAV storage, search attachments, and preview common file types. Remote images remain blocked until allowed. Desktop OpenPGP signing and encryption use GnuPG 2.x, with protected drafts kept local until sending. Flectar reports 20–140 MB RAM use and uses a custom Rust HTML/CSS renderer without embedded webviews. The project is in active alpha development; preview builds cover Windows, Linux, macOS, and Android, while iOS is coming soon.
Who it suits
Flectar Mail suits users wanting a free, open-source client with offline storage, broad protocol support, and integrated calendars. It is also relevant to self-hosted service users comfortable with alpha software.
What it does well
- Free and AGPL-3.0 open source
- Supports Gmail, Outlook, and Microsoft 365
- Offline mail and calendar storage
- Broad IMAP, JMAP, CalDAV, and WebDAV support
- OpenPGP signing and encryption
What to know first
- Active alpha development
- iOS release is coming soon
- HTML email rendering is experimental
- Windows downloads are unsigned
Verdict
Flectar Mail offers broad provider and protocol support in a free Rust application with local data handling. Its alpha status and experimental HTML rendering mean some messages or platforms may need patience.
Facts from Flectar Mail's own pages
- Android and iOS
- Android has an experimental arm64 test APK for Android 8.0 or later; the website says iPhone and iPad release is coming soon. · flectar.com, 12 Oct 2026
- App coverage
- desktop · flectar.com, 24 Sept 2026
- Architecture
- The client uses a custom Rust HTML and CSS renderer and has no embedded webviews. · flectar.com, 11 Oct 2026
- Availability
- Flectar Mail is in active alpha development; the site offers preview builds for Windows, Linux, macOS, and Android, while iOS is marked coming soon. · flectar.com, 11 Oct 2026
- Calendar and contacts
- It supports Google Calendar and Contacts, Microsoft calendars and contacts, CalDAV calendars, and CardDAV address books. · flectar.com, 12 Oct 2026
- Calendar tools
- Yes · flectar.com, 24 Sept 2026
- Development status
- Flectar Mail is in active alpha development, and its release notes say HTML email rendering is experimental and complex messages may have layout issues. · github.com, 12 Oct 2026
- Email providers
- It supports Gmail, Outlook and Microsoft 365, Flectar Base, and standards based providers using IMAP, SMTP, or JMAP. · flectar.com, 12 Oct 2026
- Encryption
- The desktop app can sign and encrypt mail through GnuPG 2.x, with protected drafts kept locally until sent. · flectar.com, 12 Oct 2026
- Files
- It can browse JMAP and WebDAV storage, search attachments, and preview common file types. · flectar.com, 12 Oct 2026
- Free plan
- Yes · flectar.com, 24 Sept 2026
- Google integration
- It connects Gmail, Google Calendar, and Google Contacts. · flectar.com, 11 Oct 2026
- Headquarters
- Málaga, Spain · flectar.com, 28 Sept 2026
- Linux
- Preview downloads include AppImage, Debian, RPM, and Flatpak packages; the release notes say Flatpak is sideloaded and has no Flathub updates yet. · github.com, 12 Oct 2026
- macOS
- Preview builds support Apple silicon and Intel on macOS 14 or later; release notes say they are ad hoc signed, not notarized, and updated manually. · github.com, 12 Oct 2026
- Maker
- Flectar identifies itself as a digital studio based in Málaga, Spain, and names Tomás Romero as its founder; it does not state a founding year on the opened About page. · flectar.com, 12 Oct 2026
- Memory use
- The site says Flectar Mail uses 20–140 MB of RAM. · flectar.com, 11 Oct 2026
- Microsoft integration
- It supports Outlook and Microsoft 365 mail, calendars, and contacts. · flectar.com, 11 Oct 2026
- Offline access
- Mail and calendar data are stored locally so synced information remains available without a connection. · flectar.com, 12 Oct 2026
- Offline use
- Mail and calendar data are stored locally so synced information remains useful offline. · flectar.com, 11 Oct 2026
- Open source
- Flectar describes Mail as open source, and its GitHub repository lists an AGPL-3.0 license. · github.com, 12 Oct 2026
- Privacy
- Remote images are blocked until allowed to help prevent tracking pixels from reporting that a message was read. · flectar.com, 12 Oct 2026
- Product
- Flectar Mail is a native Rust email client designed for fast startup and low memory use. · flectar.com, 12 Oct 2026
- Protocols
- It supports IMAP, SMTP, JMAP, CalDAV, CardDAV, and WebDAV, including standards-based and self-hosted services. · flectar.com, 11 Oct 2026
Where Flectar Mail stands on Freedom251
- Email clients#50 of 142