Apollo.io seems popular for cold email. Source: 6 months ago

FAAANGM + ATlassian/Uber and similar product based companies 85 lacs - 1.1 cr Startups like coinbase / apollo.io / rippling 80+. Source: 8 months ago

Their data seems pretty good and their features are awesome, but they had a couple of glitches this week that are annoying me. I know they seem to be the best, but has anyone bested them yet? Curious if there's anything out there that's better than Apollo.io. Source: 11 months ago

Tons of options: apollo.io is popular and affordable. If you're looking for recently funded company contact info, saasydb.com is good. Source: 11 months ago

I agree with most people here in that its invaluable. Especially when paired with some other tools like apollo.io and autobound.ai. Source: 11 months ago

MailerCheck is the best, but I used also Hunter in the past and it did its duty pretty well. Source: over 1 year ago

MailTracker for Gmail is free but it only shows you if the email has been opened. Source: over 2 years ago

Hunter mailtracker - Email tracker to see if/when/how often customer/ investors see your emails. Source: almost 3 years ago

Hunter Mail Tracker: This is a classic. Bring “WhatsApp” read checks to your email. Know each time your email gets opened. Period. Source: almost 3 years ago