It is to be expected that there are differences between the two services, but is the tag search really not an available thing on the SoundCloud App/Mobile website?
https://soundcloud.com/tags/mashup is an actual tag search, which results from me clicking on an actual Tag found in a song description, or editing the url directly.
https://soundcloud.com/search?q=%23Mashup this is a search, from which there are no specific indicators that tell it to look at tags, typing "#[word]" didn't result in a tag search, it resulted in a title search for songs with "#[word]" in it.
on-top of that, i find that the first url mentioned above doesn't work on mobile, it results in an "error, nothing found" situation.
Is the tag search feature is not on the mobile platform?
This earlier post is very similar to my situation, but a year old. The answer given is what i tried, and i found my result to be the same as User 371196580's comment.
Best answer by Mathis
Thanks for reaching out. Applying filters (including tags) on the mobile search does currently not exist actually. Our Search and Mobile teams continue to look into ways to improve the mobile apps further, so I will make sure to pass your feedback along, however I cannot provide any details as to when they can address this in particular.