Best Gmail Chrome Extensions (2026)
Last updated · picks re-checked against the Chrome Web Store
Gmail extensions add what the inbox leaves out: open tracking, mail merge, AI drafting and a quieter interface. These five each do one of those jobs well.
Short answer
Mailtrack is the most widely used way to see when Gmail messages are opened. Simplify Gmail gives you a calmer inbox, and GMass handles mail merge and bulk sends from Gmail.
How we picked
- • Works inside Gmail rather than in a separate app
- • Does one job clearly: tracking, sending, writing or decluttering
- • Usable free plan for individual use
- • Transparent about what email data it accesses
- • Large, active install base on the Chrome Web Store
At a glance
| # | Extension | Best for | Rating | Users | Pricing |
|---|---|---|---|---|---|
| 1 | Mailtrack | Seeing when emails are opened | 4.4 | 3M+ | Freemium |
| 2 | Simplify Gmail | A calmer, minimal inbox | 4.5 | 50K+ | Freemium |
| 3 | GMass: Powerful mail merge for Gmail | Mail merge and bulk sends | 4.8 | 400K+ | Freemium |
| 4 | MailTracker: Email tracker for Gmail | An alternative open tracker | 4.7 | 100K+ | Freemium |
| 5 | Compose AI: AI-powered Writing Tool | AI help while drafting | 4.1 | 300K+ | Freemium |
Ratings and install counts come from each extension's Chrome Web Store listing. A dash means the figures have not been synced yet.
1. Mailtrack
Adds read receipts and link-click tracking to Gmail, and it is one of the most installed Gmail extensions.
Best for: Seeing when emails are opened
4.4~3M+ usersFreemium2. Simplify Gmail
Strips Gmail's interface back to the essentials, which helps if the default layout feels noisy.
Best for: A calmer, minimal inbox
4.5~50K+ usersFreemium3. GMass: Powerful mail merge for Gmail
Turns Gmail into a mail merge and campaign tool, with personalised fields and follow-ups.
Best for: Mail merge and bulk sends
4.8~400K+ usersFreemium4. MailTracker: Email tracker for Gmail
Tracks opens and how many times a message was read, with notifications when it happens.
Best for: An alternative open tracker
4.7~100K+ usersFreemium5. Compose AI: AI-powered Writing Tool
Autocompletes sentences and drafts text wherever you type, including the Gmail compose window.
Best for: AI help while drafting
4.1~300K+ usersFreemium
What to know before choosing
Pick one tracker. Running two open trackers on the same message adds a second tracking pixel without telling you anything new.
Open tracking usually relies on images loading, so it is a signal rather than proof. Recipients who block images, or whose mail app preloads them, can skew the numbers either way.
Mail merge tools send from your own Gmail account, so Gmail's daily sending limits still apply.
Compare the shortlist head-to-head
Narrowed it to two? These side-by-side comparisons settle it with a feature table and a verdict.
Alternatives to the top picks
Frequently asked questions
Is Mailtrack free?
Mailtrack offers a free plan for tracking in Gmail, with paid plans that remove limits and branding. Check the current plan details on its store listing before relying on it for work.
Can recipients tell that an email is tracked?
Not directly in most cases, although some mail apps block remote images or show tracking warnings, and some free plans add a signature line.