What are some alternatives?
When comparing 42 and Slik Prospector, you can also consider the following products
SPS Commerce Analytics - SPS Commerce Analytics helps transform messy item and sales data into insights to help meet consumer demand and boost profit.
Clearbit Connect - Clearbit Connect is a free extension that surfaces actionable information on the people who email you.
Aislelabs Connect - Aislelabs offers the industry’s most sophisticated guest WiFi marketing and analytics platform to solve your business challenges.
Email Hunter for Chrome - Find all the emails related to a domain with just one click
VenueOps - Other Retail
Hunter - Find all the email addresses related to a domain