Streak is a Gmail-native CRM with tracking bundled in. The pricing ($19-$159/user/mo yearly), the Gmail-only constraint, and the architectural choice to put the CRM inside Gmail are all structural, not preferences that can be tuned. Teams typically search for alternatives when one of those structural fits breaks: they add an Outlook user, decide they want a CRM that lives outside Gmail, or realize they're paying for CRM features they don't use.
These are the six Streak alternatives worth evaluating, organized by which structural decision you're rethinking: keep the CRM but move it outside Gmail, drop the CRM and just keep tracking, or replace the whole bundle with a different shape entirely.