7 Best Email Tracking Extensions for Gmail in 2026

Knowing when someone opens your email changes how you follow up — on a sales pitch, a job application or an unpaid invoice. Gmail only offers read receipts on some work and school accounts, so most people add a Chrome extension instead.

The options range from simple open trackers to full sales platforms, and they differ a lot in scope, price and the access they ask for. Here are seven worth knowing in 2026 and who each one suits. Plans and prices change often, so check each vendor's own pricing page before you decide.

1. Zestmail — focused open tracking at a low price

Zestmail does one job well: telling you when the emails you send from Gmail are opened. It adds an invisible tracking pixel when you click Send, then shows each open in an activity feed with desktop notifications, approximate location and device information.

It also filters out the noise that makes open tracking unreliable — your own views of your sent mail, Gmail image-proxy prefetches, and security scanners or bots that load images automatically — so an "open" is much more likely to be a person.

• Free: 20 tracked emails per day. Emails sent on the free plan include a small "Sent with Zestmail" link.
• Pro: $9/month or $69/year for unlimited tracking, mail merge from Google Sheets and send scheduling, without the Zestmail link. Every new install starts with a 7-day Pro trial, no credit card required.

Best for: individuals and small teams who want reliable open tracking without paying for a sales platform.

2. Mailtrack

Mailtrack is one of the most widely installed Gmail trackers. It marks tracked messages in Gmail with check marks — one when sent, two when opened — which makes the Sent folder easy to scan. The free plan adds a Mailtrack signature to your emails; paid plans remove it and add features such as link tracking.

Best for: people who want a well-known tracker with an in-Gmail indicator.

3. GMass

GMass turns Gmail into a cold email and mail merge platform, with campaigns, automatic follow-up sequences and detailed reports.

Best for: teams running high-volume outbound campaigns from Gmail. If you only need to know whether a few emails were opened, it's more than you need.

4. Streak

Streak is a CRM that lives inside Gmail. Email tracking is one feature among pipelines, shared contacts and team collaboration.

Best for: sales and partnership teams who want to manage deals without leaving their inbox.

5. Yesware

Yesware is built for sales teams, with email tracking, templates, meeting scheduling and Salesforce integration.

Best for: sales organizations that already live in Salesforce.

6. Mixmax

Mixmax combines tracking with sequences, scheduling, polls and workflow automation in Gmail.

Best for: sales and customer teams who want automation on top of tracking.

7. Hunter's email tracker

Hunter, known for finding and verifying email addresses, also offers an email tracker for Gmail as part of its outreach tools.

Best for: people who already use Hunter for prospecting.

How to choose

• What you actually need tracked. If you only want open notifications, a dedicated tracker is simpler and cheaper than a CRM or campaign platform.
• What access it asks for. Read the Google sign-in consent screen and the Chrome Web Store permissions before you install. Our guide to email extension permissions explains what each level means.
• How it handles false opens. Image proxies and security scanners can trigger "opens" that no person made. Ask how a tracker filters them — see how email open tracking works.
• Price at your volume. Compare free-plan limits and what the paid tier adds at the number of emails you really send.

The bottom line

If you want to know when your Gmail messages are opened — without a CRM or a campaign tool — Zestmail covers it for free up to 20 emails a day, or $9/month for unlimited tracking. If you need a CRM inside Gmail, look at Streak; for high-volume outbound campaigns, GMass and Mixmax are built for that job.