Unlimited Email Tracker - Track opens and clicks, set reminders and delays in Gmail
Customer Feedback Portal - Ask customers what you should build next
Newsletter Operating System - All-in-one dashboard to launch & grow your newsletter
Feedback Fish - Collect feedback & make your customers happy.
Mailtrack.io - The best email tracking solution I've found. Free
Incoming Feedback by Hotjar - Instant visual feedback for your website or app!