NATS vs Message DB: What are the differences?
NATS: 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; Message DB: *Microservice native message and event store for Postgres *. It is a fully-featured event store and message store implemented in PostgreSQL for pub/sub, event sourcing, and evented microservices applications.
NATS and Message DB can be primarily classified as "Realtime Backend / API" tools.
Message DB is an open source tool with 913 GitHub stars and 16 GitHub forks. Here's a link to Message DB's open source repository on GitHub.