Coldlytics is very different to most B2B databases - mainly because it isn't a database at all!
Instead, you request a list by submitting your targeting criteria, and a top-tier researcher will manually build you a highly-targeted list, with all emails verified for deliverability. The leads are all delivered via Google Sheets, ready for you to import into whichever outreach tool or CRM you prefer.
The tool is popular with businesses targeting very specific niches - for example, doctors, lawyers, or even restaurants. If you are targeting a small niche within a specific geography, you'll know that there's not much data out there. Coldlytics could be your answer.