Apps similar to RegattaDB include PostgreSQL, which is free and open source. Other options are MongoDB and CockroachDB. In total there are three Relational Databases like RegattaDB for Mac, Linux, Windows, the web and self-hosting.
PostgreSQL is a powerful, open source object-relational database system with over 35 years of active development that has earned it a strong reputation for reliability, feature robustness, and performance.
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MongoDB is a document database with the scalability and flexibility that you want with the querying and indexing that you need
Cockroach is a distributed key/value datastore which supports ACID transactional semantics and versioned values as first-class features. The primary design goal is global consistency and survivability, hence the name.
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