From a brief look at Avocode, Extract does seem to have feature parity (correct me if I am wrong), it just isn't a standalone app. If you have your PSDs saved to your Creative Cloud folder, they will automatically open up in Extract: https://creative.adobe.com/files
And FYI: robust CSS copying is available by right clicking on any layer in Photoshop.
From a brief look at Avocode, Extract does seem to have feature parity (correct me if I am wrong), it just isn't a standalone app. If you have your PSDs saved to your Creative Cloud folder, they will automatically open up in Extract: https://creative.adobe.com/files
And FYI: robust CSS copying is available by right clicking on any layer in Photoshop.