InStream is an online CRM, which helps build strong relationships with customers. Developed by instream.io
License: Commercial
Followup.cc is primarily focused on email tracking and follow-up management, making it ideal for individual users looking for simplicity and effectiveness in managing their emails. InStream, on the other hand, offers a wider range of features including reporting, analytics, and team collaboration tools, making it more suitable for organizations that require comprehensive email management solutions.