What are some alternatives?
When comparing Swirl and TikTok, you can also consider the following products
ReCactus - Reaction video social app. React to online videos and share.
Coub - Coub is an app that features GIFs, but the GIFs that you select and send to other people have sounds.
Frisbee - Send videos and reactions in group chats with friends
PixelFed - PixelFed is a federated image sharing platform, powered by the ActivityPub protocol.
Reaction Story - Create your own reaction story
Instagram - Instagram is a mobile, desktop, and Internet-based photo-sharing application and service that allows users to share pictures and videos either publicly, or privately to pre-approved followers.