The best Chrome extensions for Gmail add jobs Gmail doesn't handle well on its own: follow-up reminders, scheduled sends, open tracking, mail merge, shared inboxes and a simple CRM. Most need to read your mail to work, so check the permission prompt before you install. Ten options follow in no particular order, almost all from small makers.
Gmail is where a lot of small businesses still run their sales, their client work and half their admin. A good extension can turn it into a follow-up machine. A bad one can read everything in your inbox and do very little with it.
The ten tools below are listed alphabetically and in no particular order. I read each tool's own website this week and only describe what those pages say. Before you add anything, my tips on getting more out of Gmail without extra apps might save you an install.
Gmail extensions side by side
I checked the free plan column on each tool's own website, as of Oct 2026. Yes means the page names a free plan or a free install. Trial only means the page offers a free trial or says free to try. Not stated means the page I read named neither, so check the tool's own site before you sign up.
| Tool | Type | Good for | Free plan |
|---|---|---|---|
| Boomerang | Scheduling and reminders | Meeting scheduling and email reminders | Not stated |
| FollowUpThen | Follow-up reminders | Simple follow-up reminders | Yes |
| GMass | Mail merge | Sending campaigns from Gmail | Not stated |
| Gmelius | Shared inbox in Gmail | Team inboxes with AI help | Trial only |
| Mailbutler | Email tracking and templates | Tracking opens and clicks | Not stated |
| Mailmeteor | Mail merge | Personalised emails at scale | Not stated |
| Mailtrack | Email tracking | Seeing which sent emails get opened | Not stated |
| Right Inbox | Scheduling and tracking | Send later, reminders and tracking | Yes |
| Sortd | Gmail as a board | Team workflows inside Gmail | Trial only |
| Streak | CRM in Gmail | Tracking deals inside Gmail | Trial only |
Ten Gmail tools, from reminders to a full CRM
Boomerang
Best for: Busy consultants who book a lot of calls, with one-click calendar scheduling plus email reminders and inbox management tools inside Gmail.
FollowUpThen
Best for: Freelancers who forget to chase, with a simple email reminder service and a free plan of 50 active reminders a month, as of Oct 2026.
GMass
Best for: Solo marketers sending campaigns from Gmail, with a mail merge tool that added AI insight into campaign reports.
Gmelius
Best for: Small teams sharing a support or sales address, with shared inboxes managed right from Gmail and an AI assistant its site calls Meli.
Mailbutler
Best for: Professionals who want to know who opened an email, with tracking of opens and clicks plus other inbox helpers in one extension.
Mailmeteor
Best for: Small businesses sending personalised outreach, with a Gmail extension and dashboard its site says is rated 4.9/5 from 11,741+ reviews.
Mailtrack
Best for: People who just want to know whether the emails they send from Gmail get opened, with a dedicated email tracker from Mailsuite.
Right Inbox
Best for: Gmail users who want send later, reminders, recurring emails and tracking in one place; its site says 250,000+ professionals have added it.
Sortd
Best for: Teams who think in boards rather than lists, turning Gmail into a shared inbox with team workflows; there's a 7-day free trial with no card needed.
Streak
Best for: Salespeople and agencies tracking deals without leaving Gmail, with a CRM that moves deals through pipeline stages right inside your inbox.
Which Gmail extension for which job
- You forget to follow up: FollowUpThen or Boomerang.
- You want to schedule and track in one tool: Right Inbox.
- You send personalised outreach: Mailmeteor or GMass.
- Your team shares one inbox: Gmelius or Sortd.
- You're tracking sales deals: Streak.
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The permission prompt is your filter
Tracking, mail merge and CRM extensions all need to read your mail to work. That isn't a red flag on its own, but it means the install prompt matters more here than anywhere else in your browser.
Chrome for Developers' documentation on permission warnings says some permissions trigger a warning that you have to allow at install. The listing's description is the maker's pitch. The warning is the one part they can't dress up, so compare what it asks for with the job you're installing the extension to do.
Keep a short note of which extensions you installed and why. When something stops working you'll know what it was meant to do, and when you stop using one it's easy to remove. Fewer extensions also means fewer permission prompts to keep an eye on, and less of your mail sitting behind add-ons you've forgotten about.
For the rest of your browser day, try small productivity tools.
Five checks before you add a Gmail extension
- Pick the one job you want Gmail to do better.
- Read the permission warning and compare it with that job.
- Check the free plan column, because several tools here are trial only.
- Try it on a quiet day, not in the middle of a client launch.
- Remove any extension you stop using, so it isn't left sitting on access to your mail.
Do you make Gmail extensions or email productivity tools? Tool makers can ask to be considered for a featured place on this list.
My plain advice on choosing a Gmail extension
Start with follow-up reminders. For most small businesses, the money in the inbox is in the replies you forgot to chase, not in fancier tracking. Add mail merge or a CRM only once you know you'll use it every week.
If Gmail is your whole email marketing setup, my guide to running email marketing with just Gmail shows how far it can go.
Want your tool on this list? Featured spots and reviews here are paid partnerships. Here's how to partner with me.
Frequently asked questions
What are the best Chrome extensions for Gmail?
It depends on the job: reminders, send later and tracking, mail merge or a CRM. The picker above pairs each job with the tools that suit it.
Are Gmail extensions safe?
Many need to read your mail to work. Chrome warns about some permissions at install, so compare what the extension asks for with what it needs to do.
Can I schedule emails in Gmail with an extension?
Yes. At least two tools on this list offer send later, recurring emails or calendar scheduling, plus email reminders, inside Gmail.
Is there a free Gmail follow-up reminder?
One tool on this list lists a free plan with 50 active reminders a month, as of Oct 2026, and another says it's free to add to Gmail.
Can I use Gmail as a CRM?
Yes, with an extension. One tool on this list is a Gmail CRM with deal pipelines, and another turns your inbox into shared team workflows.
