The best alternatives to IGDB are Wavedash, Play Date, and Game Dev Links. If these 3 options don't work for you, we've listed a few more alternatives below.
What do you think of IGDB?
AssemblyAI— Speech-to-Text API with superhuman accuracy
Wavedash is gaming's new home. Discover new games. Keep track of what you've played. Share lists and reviews with friends. Form a backlog of games you want to play later. And browse the entire history of video games through our library of over 130,000 titles.
Play Date is a video game release calendar for iOS - you can set in app reminders for games you're interested in, it gives you countdowns to releases and can be configured to only show you games for the platforms and region you care about - and it's 100% free.