I'd say, go for .io if it's a developer-centric product, else .com undoubtedly. I've been using https://instantdomainsearch.com https://instantdomainsearch.com

I'd say, go for .io if it's a developer-centric product, else .com undoubtedly. I've been using https://instantdomainsearch.com https://instantdomainsearch.com (no affiliation, just a happy user) for years to find great domain names. Good luck!