Is Opened is described as 'Get notified when your gmail emails are opened with Is Opened' and is an app in the Online Services category. There are more than 10 alternatives to Is Opened for a variety of platforms, including Online / Web-based, Google Chrome, Windows, Linux and Chrome OS. The best alternative is Gmelius. It's not free, so if you're looking for a free alternative, you could try Mailtrack for Gmail or Mailcastr. Other great apps like Is Opened are mTracker (Free, Open Source), MailTracker by J David Baker (Free), Bananatag (Freemium) and Remail.io (Paid).
Gmelius transforms your inbox into your company’s workspace. It brings your team together in Gmail by turning it into a work hub for communication, collaboration, and workflow automation with real-time syncing across all devices - web & mobile.
Mailcastr is an email tracker app for Gmail and Inbox which shows when your email is opened/read by the recipient. Mailcastr android app helps you to stay updated wherever you are with real time push notifications and updates.
This is a very basic mail tracking service which I developed for my personal use. To see it working, visit mTracker. You can read about the project in my blog. How to use it: 1. Visit the website 2. Fill the form 3. Get the HTML code
The Intelliverse Email Tracker application lets you know WHEN your email was opened, WHERE it was opened, and on WHAT device. With these insights, you can more strategically plan when to follow up on your email.