WKD Support
This page tracks the progress of WKD support and usability in different software projects, with links to any known public feature request discussions that may exist; feel free to add/update information about your favorite product.
Software table
Note: This list is sorted alphabetically and not by quality of implementation.
Column key
- Methods: A filled star represents support for one of the two access methods described in the WKD draft standard, Direct and Advanced.
- Usability: Visualizes the completion percentage to the WKD usability criteria are fulfilled.
 Name |
 Platform |
 Type |
 Methods |
 Usability |
| Balsa | GNU/Linux | Desktop client |  |
Not tested yet |
| Claws Mail | GNU/Linux, Windows | Email client | |
 |
| Evolution | GNU/Linux | Email client |  |
no test possible |
| FairEmail | Android | Email client | |
 |
| Geary | GNU/Linux | Email client | |
no test possible |
| GpgOL (Outlook) | Windows | Plugin | |
not tested yet |
| K9Mail | Android | Email client | |
 |
| KMail | GNU/Linux | Email client | |
 |
| Mailvelope | Browser | Extension | |
|
| Thunderbird | Windows, GNU/Linux, MacOS | Email client | |
 |
Products notes
Balsa
- Balsa retrieves keys automatically via WKD since the release of v2.6.5 on 2025-04-12 (changes introduced in this merge request)
- Original request for WKD implementation and automatic retrieval of keys
Evolution
- WKD should be enabled by default (see issue)
FairEmail
- Currently working on WKD: No
- Requested automatic retrieval of pubkeys (Post in forum)
Geary
- There is no hint in the settings of the application or the overview in the built-in manual that Geary does support encryption.
K9Mail
- Currently working on WKD: ?
- Requested automatic retrieval of pubkeys (Issue)
KMail
- Requested a possibility to retrieve missing keys in the area where the signature is shown