No extra software is necessary with Mirosign. With Mirosign the signatures are created using our web app and downloaded then installed directly on your own devices. The HTML email signature is installed in your own email sending software with no extra software, plugins, extensions or app installation.*
So all you need is your own email application that accepts HTML email signatures!
*The only exception to this is when installing Mirosign email signature in Outlook for Mac. Neither Microsoft Outlook 2011, 2016, 2019, nor 365 for Mac offer creation of email signatures from HTML. This requires an additional third party plug-in costing $2.99 called HTML Email Signature – Outlook