What are some alternatives?
When comparing Sparta and Cold Email Hacks, you can also consider the following products
Close - A CRM with built-in calling, SMS, and email
Cold Email Generator - Quickly create a 5-touchpoint email campaign
SalesWise - A gorgeous launchpad for sales people
Cold Email Analyzer by Mailshake - Real-time analysis of email subject lines and copy
Hoopla - Your public library at your fingertips.
Mailshake - Mailshake lets you build your professional network through a smart and intuitive approach to cold emailing.