Claws Mail
Claws Mail: A focused desktop mail client with plugins for RSS and calendar features. Ranked #72 of 142 in Email Clients by our editors (3.0/10); pricing: Free plan; best for open-source users wanting a lightweight mail client.
At a glance
- Editor score3.0 / 10
- PricingFree plan
- Best forOpen-source users wanting a lightweight mail client
- Free planYes
- Paid fromFree
- App coverageAll
- Facts checked21 Sep 2026
Where it wins
- Free and open-source under the GNU General Public License
- Keyboard-accessible commands and responsive desktop operation
- Plugins add RSS aggregation and calendar functionality
Where it doesn't
- Desktop coverage only
- Calendar tools require an extra plugin
- Core feature set is comparatively limited
Our verdict on Claws Mail
Claws Mail is a GTK+-based desktop email client and newsreader for users who want a lightweight, open-source application. It supports straightforward configuration, keyboard-accessible commands, MH-format message management, and importing or exporting email from other clients. Its desktop-only coverage makes it a focused choice for managing mail and news from a computer rather than across a broader device ecosystem.
The core client concentrates on email and newsreader functionality, with plugin extensibility providing a path to additional tools. RSS aggregation is available through plugins, as are calendar capabilities. This structure suits users who prefer a smaller core application and are comfortable extending it when needed. It also means that calendar functionality is not part of the core client, so buyers looking for an immediately integrated calendar should assess whether the plugin approach fits their workflow.
Claws Mail is distributed under the GNU General Public License and includes MH-format message management, email import and export, and keyboard-accessible commands. Those features give it a practical foundation for users prioritizing control, portability of mail, and efficient keyboard navigation. The trade-off is a comparatively limited verified core feature set, with some broader functionality handled through extensions. Choose Claws Mail for open-source desktop email and newsreader use with optional RSS and calendar additions; consider another email client if you need wider platform coverage or a more extensive built-in feature set.
Your product? Our editors can test Claws Mail in depth and publish a review, labelled as paid · from $149/mo →
Claws Mail pricing
Claws Mail fact sheet
| Free plan | Yes |
|---|---|
| Paid from | Free |
| App coverage | All |
| Account limit | Not verified |
| Unified inbox | Not verified |
| Offline access | Yes |
| Scheduled sending | No |
| Calendar tools | Yes |
| Deployment | Desktop |
| Platforms | Windows, Linux, macOS |
| Support | Community, Docs |
| Built for | Solo, Small business (editorial estimate) |
| Pricing | Free plan |
| Website | claws-mail.org |
| Facts checked | 21 Sep 2026 |
Alternatives to Claws 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 Claws Mail alternatives →
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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