Best tool to build a pre-launch waitlist?

I spent considerable time looking for a solution to build a waitlist. Existing solutions are too pricey or don't have a good user experience.

I therefore decided to build a waitlist software myself and I'm calling it: Waitlist Guru. Here it is: https://waitlist.guru

I am building it for you and me - and I'd appreciate your feedback. I'll be happy to offer it for free in exchange for feedback.

Please sign-up and let me know what you think.