BlueTicks adds WhatsApp style read receipts to Gmail. In your sent list, one tick means the message was sent and two blue ticks mean it was opened, so you can tell at a glance which emails were read without opening a separate dashboard.
It is for anyone who sends email and then waits: freelancers following up on a quote, founders doing outreach, recruiters, and small support teams who need to know whether a message landed before they send a reminder.
What it does not do, said plainly: it cannot tell you where a message was opened, and it does not measure attention. An open is recorded when the message is displayed with images enabled, so a recipient whose client blocks images can read your email without being counted.
Versions exist for Chrome and Firefox. It costs 4 dollars a year, and the free tier covers 30 tracked emails a month.
Gmail tells you a message was sent and then tells you nothing else. Everything after that is guesswork: whether to follow up, when, and whether silence means no or means unread. That gap is the whole reason this exists. The honest version of the fix is narrow, and the product page says so rather than implying more. A tick means the message was displayed with images enabled. It does not mean anyone read it carefully, and a recipient who blocks images can read without being counted.