MobyGames
A community-maintained game database covering platforms, dates, credits, editions, cover art, and company relationships, with an API.
Why use it
Concept research can trace genre lineage, developer histories, and multi-platform release patterns beyond recent hits.
Where it fits
Study the market and the players you want to reach, then turn a loose idea into something you can test.
What to check
Coverage varies; free API access is for personal noncommercial use, while commercial products need an appropriate paid plan and must respect media rights.