DalmatinerDB vs IonDB: What are the differences?
DalmatinerDB: A fast, distributed metric store. DalmatinerDB is a no fluff purpose built metric database. Not a layer put on top of a general purpose database or datastore; IonDB: A key-value store for microcontroller and IoT applications. Currently in the Arduino world, there doesn't exist an associative array or map implementation that is both easy to use and performance competitive. There also is little support for disk based storage options that don't involve writing it yourself. IonDB is fast, functional, and offers disk based storage out of the box.
DalmatinerDB and IonDB belong to "Databases" category of the tech stack.
DalmatinerDB and IonDB are both open source tools. DalmatinerDB with 696 GitHub stars and 45 forks on GitHub appears to be more popular than IonDB with 525 GitHub stars and 37 GitHub forks.