Author here. It uses DuckDB under the hood, which is a fantastic piece of software.
Yes, even DuckDB has UI now, but I didn't find it to my taste. There's no table view, filters are a bit weird, and not exactly keyboard accessible. TextQuery also has Visualize feature to quickly create charts and tabs to run things in parallel. Again, it's personal preference, but there are advantages in being a desktop-first app.
