Hi HN! I made this.
The idea came from my initial idea which was to build a LinkedIn scheduler. I started reaching out to people on LinkedIn to see if they'd like to try it out and noticed a way better reply rate when I personalized my messages.
However, that process took so much time that I decided to automate it. This gave me the idea to build https://hotreachai.com/ to solve this issue at scale.
Right now, I'm monetizing this as a pay-per-use service with free credits to let users try it out first.