Are many people actually applying for enough jobs for this to have a major use? I know there are plenty of stories of new grads needing 300 applications to get a job, but how common is that? How many jobs were you applying for to inspire this? As an aside, I like your use of the Chrome extension as I built something similar at my company for legal research.
I can't imagine applying to that many jobs as an experienced dev. My last job transition I narrowed down my search to 3 companies that I was interested in enough to apply & interview, based on combination of compensation, culture, and product. Got an excellent offer from one of them, and still happy 2+ years later. I know that's a fortunate position to be in, but it's been a job-seeker's market for years. I feel like…
I just forget what the status of each application was or is. When did I apply, when was the last communication and what was discussed. I just don't want to worry about any of it, so I write it down.
I wouldn't use an app like this because I would simply create another spreadsheet when I need it again, but I can see how it would be useful even for a small number of companies to track.