Snapchat is known for strong privacy — it even notifies when someone screenshots! So can you view Snap stories without them knowing?
Snapchat is stricter than Instagram regarding privacy. Instagram has more tools available because public content is accessible via web. Snapchat encrypts content more heavily.
DarkViewer supports viewing some Snapchat content anonymously, especially public stories and Spotlight content. Try entering a Snapchat username in the tool.