Hey there! The primary difference is that DuckDB is primarily a compute engine for analytical workloads, while Skardi is tackling the challenge with online serving queries. In addition, DuckDB provides read-only access to their data, while Skardi allows you to access multiple data sources and support read-write queries for a bunch of major stream DBs such as MySQL, Postgres, Mongo, etc.

Happy to list more comparisons if you want to discuss more!