NATS vs SignalR: What are the differences?
Developers describe NATS as "Lightweight publish-subscribe & distributed queueing messaging system". Unlike traditional enterprise messaging systems, NATS has an always-on dial tone that does whatever it takes to remain available. This forms a great base for building modern, reliable, and scalable cloud and distributed systems. On the other hand, SignalR is detailed as "A new library for ASP.NET developers that makes developing real-time web functionality easy". SignalR allows bi-directional communication between server and client. Servers can now push content to connected clients instantly as it becomes available. SignalR supports Web Sockets, and falls back to other compatible techniques for older browsers. SignalR includes APIs for connection management (for instance, connect and disconnect events), grouping connections, and authorization.
NATS and SignalR can be primarily classified as "Realtime Backend / API" tools.
"Fastest pub-sub system out there" is the primary reason why developers consider NATS over the competitors, whereas "Supports .NET server" was stated as the key factor in picking SignalR.
SignalR is an open source tool with 7.73K GitHub stars and 2.19K GitHub forks. Here's a link to SignalR's open source repository on GitHub.
According to the StackShare community, NATS has a broader approval, being mentioned in 27 company stacks & 11 developers stacks; compared to SignalR, which is listed in 20 company stacks and 16 developer stacks.