A bunch of these are popping up because LocalStack changed their free tier and people needed something else. This isn’t trying to replace all of LocalStack. Just the basic stuff people were using before, and keep it fast for local dev.. If you care about exact behavior or edge cases you still need real AWS. This is more for quick integration tests so you’re not hitting AWS all the time.

What’s different? IDK, you could try the "dozen AI vibe coded shitty local stack alternatives" and post it on your blog