Mixup.audio is a new service aimed at making remote collaborations easier, and it's accessible both through standard Internet browsers (on both desktop and mobile devices), and via a VST/AU/AAX plug-in.
Essentially, Mixup.audio lets you upload uncompressed audio files for your collaborators ('Guests') to listen to. Although you need an account to do the uploading, Guests can download and stream (at up to 16-bit/48kHz) the audio simply by clicking a uniquely generated URL, making the platform ideal for sharing audio with clients. The service includes version tracking, so you can use it to keep track of multiple mix revisions, and it even lets Guests add comments at specific points on the streaming timeline.
The plug-in version works just like it does in the browser, except that the former lets you upload straight from your DAW project, and control your DAW's transport from within the plug-in window (using the ReWire protocol). Common to both versions is a Track Level Aligner feature, which lets you match the level of your uploaded files to that of common streaming services like Spotify, Tidal and YouTube, so that you can accurately reference your mixes against commercial material.
Best of all, though, is that Mixup.audio's core functionality is completely free. If you require greater security, however, such as password protection and 'VIP Access', you can opt for one of the two paid-for services, Pro and Studio (see the comparison table for more details).