What are some alternatives?
When comparing TikTok and Reaction Story, you can also consider the following products
Coub - Coub is an app that features GIFs, but the GIFs that you select and send to other people have sounds.
Trump Reactions - Replace new Facebook reactions with Trump 😮
PixelFed - PixelFed is a federated image sharing platform, powered by the ActivityPub protocol.
Facebook Reactions - A more expressive Like button
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.
Reaction Packs for Facebook - Swap out Facebook reactions for something a little more fun.