Trello is great, I actually use it for this project:). The main difference (for now) is tracking documents. When I am job searching I usually have several versions of CVs and many versions of cover letters. Managing and tracking those isn't always the easiest thing. Hence, ConvertJob.
I too recently launched AI automations for Gmail. I am a heavy email user, so connecting chatgpt to my inbox was obvious to me. When gpt-4 was released it passed my tests with 90% accuracy, so I've decided to release it at inboxchat.ai
But while I enjoy AI sorting my emails, the most useful feature for meturned out to be screener, inspired by this post: https://blog.nawaz.org/posts/2018/Sep/solving-my-email-probl.... It sends all emails from first-time or unknown senders into a separate Review Later label. If email is moved to Inbox, then that sender becomes trusted and is allowed into Inbox in the future. It's simple, dumb feature but so effective