"Security was my main concern at the time as well. From what I gathered they also had pretty high infrastructure costs & trouble converting users to paying customers. The problem they solved is as, if not more, relevant today as it was back then, with the number of services in use increasing. To this end, I've been working on https://starthq.com which does the same thing as Greplin, but via a browser extension without needing access to your data. Would be great if you could try it out and let me know what you think!" - Oleg Podsechin