Flectar Mail
Flectar Mail: Open-source desktop mail with offline access, broad protocols, and built-in calendar tools. Ranked #50 of 142 in Email Clients by our editors (4.5/10); pricing: Free plan; best for windows and Linux users wanting secure offline mail.
At a glance
- Editor score4.5 / 10
- PricingFree plan
- Best forWindows and Linux users wanting secure offline mail
- Free planYes
- Paid fromFree
- App coverageDesktop
- Facts checked24 Sep 2026
Where it wins
- Unified inbox with email, calendars, and contacts in one app
- Offline mailbox and calendar data with attachment search
- Supports Gmail, Outlook, Microsoft 365, JMAP, CalDAV, and CardDAV
Where it doesn't
- Windows and Linux are the ready desktop platforms
- The product is still in development and not yet stable
- macOS, Android, and iOS support is still coming
Our verdict on Flectar Mail
Flectar Mail is an open-source desktop email client for Windows and Linux users who want mail, calendars, contacts, and offline data in one application. Its unified inbox connects multiple accounts, while support for Gmail, Outlook, Microsoft 365, IMAP/SMTP, JMAP, CalDAV, and CardDAV gives it broad compatibility across common email and calendar services. The native Rust interface avoids embedded webviews, and local-first handling keeps mailbox and calendar data available offline. It is designed for people who prefer a focused desktop client over separate webmail, calendar, and contacts applications.
Its strongest fit is its protocol and ecosystem coverage. Flectar Mail can connect to major hosted services as well as standards-based mail, calendar, and contacts systems. Desktop OpenPGP/MIME signing and encryption add a privacy-focused capability, while attachment search and local file previews support mail-heavy workflows. Three-pane and minimal workspace layouts, plus light and dark themes with custom color palettes, let users adjust the interface to their preferred level of density. Choose Flectar Mail when offline access, unified account handling, and standards support matter more than a browser-first workflow.
The main consideration is platform maturity. Windows and Linux builds are available, while macOS, Android, and iOS support is still being developed or previewed. Flectar Mail is explicitly in development and not yet stable, so users who need a mature product across desktop and mobile platforms should consider an alternative. It is a better match for Windows and Linux users comfortable adopting an evolving open-source client, particularly those who value offline data, encryption, and integrated personal information management.
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Flectar Mail pricing
Flectar Mail fact sheet
| Free plan | Yes |
|---|---|
| Paid from | Free |
| App coverage | Desktop |
| Account limit | Not verified |
| Unified inbox | Yes |
| Offline access | Yes |
| Scheduled sending | Not verified |
| Calendar tools | Yes |
| Deployment | Desktop, Mobile |
| Platforms | Windows, macOS, Linux, Android |
| Support | Community, Docs |
| Built for | Solo, Small business (editorial estimate) |
| Integrations | 11 integrations: Gmail, Google Calendar, Google Contacts, Outlook, Microsoft 365, IMAP … |
| Pricing | Free plan |
| Website | flectar.com |
| Facts checked | 24 Sep 2026 |
Flectar Mail integrations
Flectar Mail lists 11 integrations on its own site.
- Gmail
- Google Calendar
- Google Contacts
- Outlook
- Microsoft 365
- IMAP
- SMTP
- JMAP
- CalDAV
- CardDAV
- WebDAV
Alternatives to Flectar Mail
- Mozilla ThunderbirdA capable free client for multi-account email, offline access, and desktop productivity tools.9.4
- Zoho MailA flexible hosted email service with free access, migration tools, and Zoho collaboration options.9.2
- Apple MailA capable Apple-focused email client with unified inboxes, scheduling, privacy controls, and AI assistance.9.1
See all Flectar Mail alternatives →
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Reviewed by iTechGuides Editors · Editorial team · Updated Sep 2026
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