I think it's the graphqleditor.com which makes sense being their blogpost. At the end of the post you can click the button and try (as in a trial) the graphqle

I think it's the graphqleditor.com which makes sense being their blogpost. At the end of the post you can click the button and try (as in a trial) the graphqleditor It's nice, but if you want a free one check altair or just use postman?