[catchmeifyoucan]

I haven't heard of bfe.dev before. But I like yours better for a few reasons.

1. It has CodeSandbox built-in with a live preview

2. You actually wrote test cases, most FrontEnd Interviews don't even have that, and neither do practice probolems.

3. You should consider making the submit code button should larger!

Since you're still building traction, and the library is still small, I would consider changing the way you upsell. Rather than lock things behind a paywall and drive people away. I want more hard questions, and to play w/ the component design q's.

You could consider making all your problems free, and limit the number of test runs? This is kind of how bfe.dev was doing it. You could auto-run the tests in the background, and give a score, but not tell the user where they failed. Solutions could be paywalled, but not the problem. Hope this takes off!

[xempes]

Thank you for the great feedback! I've considered open-sourcing the project but walked back on that since people have already paid for it and I feel like that may be upsetting. May reconsider it in the future as I get more feedback.