Is it really free?
Yes. It's open source under the GNU AGPL-3.0. The one extra condition: the author credit in the “About” dialog has to stay in every copy and modified version (details in NOTICE).
Where is my data?
On your server, in a Docker volume. The app talks to IGDB, eBay and a few cover databases to fetch game data, but your collection is never uploaded anywhere.
Do I need API keys?
IGDB keys are required and free (a Twitch developer account). eBay keys are optional and only used for suggested prices; you can add them later in Menu → Tools.
Can I use it outside my home?
It's built for your home network. Don't expose it directly to the internet; if you need remote access, use your own VPN.
What does it run on?
Anything that runs Docker on x86-64 or ARM64. It's light enough for a Raspberry Pi or an old thin client.
Is this affiliated with Sony, Microsoft or Nintendo?
No. Console and game names belong to their owners, and the looks use no logos.