Close vs MailTracker

Close has no write-up on Specifiction yet; its figures are above.

MailTracker adds open and link tracking to Gmail through a Chrome extension, with a web platform listed as well. It reports when a message is first opened, the number of views, and whether viewing happened on mobile or desktop. Real-time Chrome notifications can flag a first open, while email alerts can report an open or a message still unopened after 48 hours. Tracking can be disabled in one click or limited to selected emails. The free plan allows 20 tracked emails per month and includes first tracking history, alerts, Chrome notifications, an activities feed, and no signature. Paid plans add link tracking, reminders, complete history, CSV export, and scheduled-email tracking. MailTracker uses Gmail API permissions covering reading, composing, sending, and permanent deletion. It says it processes events and metadata without storing message contents. Tracking may be incomplete when recipients block images, use incompatible software, forward messages, or view cached content.