caniusesql.com
Quickly check whether a SQL command or function is supported across major databases (PostgreSQL, MySQL, SQL Server, SQLite, Oracle).
Ideal for cross‑DB development, migrations, and writing portable SQL. I built it because it didn’t exist. One day, I had to query, “Can I use X on Y database, version Z?” I then thought, “Why isn’t there a tool like caniuse.com, but for SQL?” So, I built it.