10 Best Gmail Productivity Extensions in 2026

Mailbutler

Source: Mailbutler.io

Mailbutler is a Gmail extension that bundles several of the features other tools on this list sell separately: email tracking, send-later scheduling, mail merge, shared inbox collaboration, and signature tools, alongside AI writing assistance, notes, and tasks attached to individual emails.

The tracking goes beyond a simple open receipt — it covers engagement history, device and location data, and per-recipient tracking, along with AI-powered follow-ups and CRM sync.

Scheduling works per recipient rather than as a single blanket send time, which matters if your contacts are spread across time zones. Mail merge lets you personalize a batch send without leaving Gmail, and the signature tools double as a lightweight signature marketing channel — useful for teams that want every outgoing email to also promote a webinar, offer, or update.

The collaboration layer is aimed at small teams rather than enterprise help desks: teammates can assign emails and share notes, tasks, signatures, and templates so everyone sees the same context on a shared account. That’s a narrower scope than a dedicated shared inbox tool like Gmelius, but it means teams get collaboration without adopting a second platform.

Mailbutler has a free-forever plan that includes limited features and adds a visible watermark to outgoing emails. Paid tiers start from $5/user/month for the tracking-focused Starter plan, up to the all-inclusive Business plan that adds a custom tracking subdomain and CRM sync.

Use Mailbutler if:

• You want tracking, scheduling, mail merge, and signatures without installing four separate extensions
• Your team is small enough that email assignments and shared notes/tasks/templates cover your collaboration needs

Skip it if:

• You need an enterprise-scale CRM with custom roles and data validation (look at Streak or a dedicated CRM instead)
• You only need one narrow feature, like free read receipts (Mailtrack’s free tier will cover that alone)

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Streak

Source: Streak.com

Streak turns Gmail into a full CRM: pipelines, deal stages, shared contacts, and mail merge, all inside the inbox you already use. It works inside Gmail and other Google Workspace apps, and is one of the more established CRM tools for small businesses, startups, and freelancers.

Every deal links back to the email thread, contacts, tasks, and files tied to it, so a click on a pipeline card shows the full history without a separate search. Streak’s mail merge sends personalized bulk emails through your actual Gmail account rather than a third-party server, which helps with deliverability.

Streak’s official pricing lists Pro at $49/user/month (annual) or $59 billed monthly, Pro+ at $69/$89, and Enterprise at $129/$159, each with an AI credit allowance that doesn’t roll over month to month. There’s no permanent free CRM tier anymore — only email power tools (tracking, snippets, limited mail merge) stay free indefinitely.

Use Streak if:

• You want a real sales, hiring, or dealflow pipeline without leaving Gmail
• Your team already standardizes on Google Workspace

Skip it if:

• You want CRM features on a free plan (Streak no longer offers one)
• You’re managing more than a few hundred active deals — reviewers note Gmail slows down as pipeline data grows

Boomerang

Source: BoomerangGmail.com

Boomerang popularized send-later scheduling and inbox snoozing years before Gmail added native versions of both. What Boomerang still does that Gmail doesn’t: conditional follow-up reminders ("bring this back if nobody replies in three days"), Inbox Pause to stop new mail from appearing while you focus, and Respondable, an AI writing coach that scores your draft before you send it.

Pricing runs from a free Basic plan (10 message credits/month — barely enough to trial the tool) through Personal at roughly $5/month, Pro at roughly $15/month, and Premium at roughly $50/month for Salesforce/CRM integration and priority support (all annual-billed rates).

The credit system counts any scheduled send, response-tracking use, or read receipt against the monthly allowance, and the Personal plan is limited to Gmail addresses only — Google Workspace accounts need the Pro tier.

Use Boomerang if:

• Conditional "remind me if they don’t reply" follow-ups are central to how you work
• You want Inbox Pause as a focus tool
• You’re on a personal Gmail account and don’t need Workspace support at the cheapest tier

Skip it if:

• You only need basic scheduling and snoozing — Gmail’s native tools already cover that for free
• You’re on Google Workspace and want the cheapest plan; you’ll need Pro, not Personal

Right Inbox

Source: RightInbox.com

Right Inbox packages scheduling, templates, reminders, and light email sequences into one inexpensive extension. It adds email scheduling to send messages at optimal times, plus tracking to monitor when emails are opened and clicked, on top of templates and automated follow-ups.

It’s positioned as a lighter, cheaper alternative to Boomerang and sits well for freelancers or small business owners who want scheduling and basic outreach tools without paying for a full sales engagement platform. Higher tiers add CRM integrations with Salesforce, Zoho, and Pipedrive.

Plans start around $7.95/month for individual use, with team and professional tiers priced higher; a limited free plan is available to trial the extension first.

Use Right Inbox if:

• You want scheduling, templates, and reminders in one cheap extension
• You send small-scale personalized outreach (tens to low hundreds of emails) without a dedicated sequencer
• Budget matters more than feature depth

Skip it if:

• You need reliable, deep sequence analytics or true cold-email infrastructure

Mixmax

Source: Mixmax.com

Mixmax is a sales engagement platform built as a Gmail sidebar rather than a separate app. It enhances Gmail with tracking, sequences, scheduling, and analytics directly inside the inbox interface instead of replacing your email workflow, and everything happens without leaving Gmail.

Mixmax’s sequence builder runs from the compose window, supporting multi-step automated follow-ups and subject-line A/B testing. CRM sync with Salesforce or HubSpot is available on higher tiers. Pricing generally spans from around $29/user/month for SMB-oriented plans up to roughly $89/user/month for the bundle that includes full CRM sync, sequences, and AI features. Enterprise pricing is custom.

Use Mixmax if:

• You run a small sales team’s outreach entirely from Gmail
• You want CRM sync without an enterprise sales-engagement contract
• Ease of setup matters — most teams are productive within a day or two

Skip it if:

• You need a built-in dialer or LinkedIn automation (not included; pair with a separate tool)
• You’re scaling past a couple dozen reps — per-seat pricing adds up quickly

Gmelius

Source: Gmelius.com

Gmelius turns Gmail into a team collaboration workspace: shared inboxes, shared labels, internal notes, and Kanban-style boards for turning emails into task cards. It’s aimed at support, ops, and small sales teams that need to triage a shared address like support@ or sales@ as a group, without adopting a separate help desk platform.

Gmelius pricing has shifted several times across 2025 and 2026, but current tiers cluster around $19–25/user/month for shared inboxes and automation, rising to roughly $40/user/month for advanced automation, integrations, and reporting. There’s no permanent free plan — only a short trial. Some reviewers flag noticeable load-time slowdowns inside Gmail once email volume grows, which is worth testing before committing to the extension.

Use Gmelius if:

• Your team needs a shared inbox and internal notes without leaving Gmail
• Kanban-style task tracking fits how you triage email
• You’re comfortable with per-seat pricing and no free tier

Skip it if:

• Performance at high volume is a dealbreaker — test with your real email load first
• You want a genuinely free entry point (try a dedicated help desk tool instead)

Mailtrack (Mailsuite)

Source: Mailsuite.com

Mailtrack, rebranded Mailsuite in 2024, is one of the most widely installed Gmail tracking extensions, adding WhatsApp-style checkmarks that show when a recipient opens your email. It’s the simplest, cheapest way to get basic read receipts inside Gmail.

The free plan gives unlimited basic tracking but stamps a visible "Sent with Mailtrack/Mailsuite" watermark on every email and caps some features. Paid plans remove the branding and unlock link tracking and campaign sending, generally running around $10–12/user/month.

Use Mailtrack if:

• You just want to know if an email was opened — nothing more
• You’re fine with a small branding footer on the free tier, or a cheap upgrade to remove it
• You don’t need scheduling, CRM, or collaboration features at all

Skip it if:

• You send cold outreach — tracking pixels can hurt deliverability with aggressive spam filters
• You want tracking bundled with scheduling and mail merge (Mailbutler and Right Inbox cover more ground for a similar price)

Grammarly

Source: Grammarly.com

Grammarly isn’t Gmail-specific, but its browser extension works inside the Gmail compose window and is one of the most-installed productivity extensions for anyone who writes a lot of emails. It checks grammar, spelling, tone, and clarity in real time, and its AI features can rewrite full sentences or adjust tone on request.

Grammarly’s Free plan covers real-time grammar and spelling checks plus a limited monthly allowance of AI prompts. The paid Pro plan — which folded the older Premium and Business tiers into one offering — costs $12/month billed annually (or $30/month billed monthly) and adds full-sentence rewrites, plagiarism detection, and a much larger AI prompt allowance, while supporting team features for organizations that need shared style guides. Enterprise pricing is custom.

Use Grammarly if:

• You write a high volume of emails and want consistent, error-free copy
• AI-assisted rewrites and tone adjustment would save you editing time
• You want one writing tool across Gmail, docs, and other apps, not just email

Skip it if:

• You need scheduling, tracking, or collaboration — Grammarly doesn’t touch any of that
• You’re a light email user; the free tier likely covers your needs already

WiseStamp

Source: WiseStamp.com

WiseStamp is a dedicated email signature builder and management tool that works as a Gmail extension alongside Outlook and other clients. It focuses on one thing — professional, branded signatures with templates, social links, and banners — rather than trying to be a general productivity suite.

For teams, that narrow focus is the appeal: you can standardize how every employee’s email looks without a design project. Pricing is inconsistently reported across review sites, with personal plans generally starting in the single digits per month and team/business plans priced higher. Confirm current rates directly on WiseStamp’s website before committing, since third-party listings disagree noticeably here.

Use WiseStamp if:

• Signature consistency and branding across your team is your main goal
• You want signature banners or CTAs without a design tool
• You’re comparing dedicated signature tools rather than an all-in-one extension

Skip it if:

• You’d rather have signatures bundled with tracking and scheduling in one tool (Mailbutler’s signature tools cover basic branding alongside its other features)
• Pricing transparency matters — cross-check the official site carefully first

FlowCrypt

Source: FlowCrypt.com

FlowCrypt adds PGP-based end-to-end encryption to Gmail through a "Secure Compose" button. It lets you generate a PGP key in a few clicks, send encrypted attachments, sign messages, and exchange encrypted email even with recipients who don’t use FlowCrypt themselves, using password-protected email as a fallback.

This is a niche but genuinely useful category: most productivity extensions on this list optimize for speed and visibility, while FlowCrypt exists for the opposite reason — sending something that specific recipients, and only those recipients, can read. The core Gmail extension for individuals is free. Workspace-level Client-Side Encryption and enterprise key management are separately priced and require a Google Workspace Enterprise Plus or Education Plus license, with custom enterprise pricing.

Use FlowCrypt if:

• You occasionally need to send genuinely confidential information over Gmail
• You want encryption without leaving your existing Gmail workflow
• Your organization is on Google Workspace Enterprise Plus and wants Workspace-wide client-side encryption

Skip it if:

• You need encryption as your everyday default — the extra steps add friction for routine email
• Your recipients won’t use PGP or a password-protected fallback

Which Gmail productivity extensions should you choose?

If you care most about...	Pick
One extension covering tracking, scheduling, mail merge, and signatures	Mailbutler
A full CRM pipeline inside Gmail	Streak
Conditional follow-up reminders and inbox pause	Boomerang
Budget scheduling and light outreach	Right Inbox
Sales sequences with CRM sync	Mixmax
Shared inboxes and team triage	Gmelius
The cheapest possible read receipts	Mailtrack (Mailsuite)
Cleaner writing and AI rewrites	Grammarly
Branded, consistent signatures	WiseStamp
Encrypting sensitive threads	FlowCrypt

Conclusion

Most people don’t need ten extensions running in their Gmail toolbar at once — they need the two or three that solve their actual bottleneck. If that bottleneck is a single feature, the specialists on this list (Mailtrack for tracking, WiseStamp for signatures, Grammarly for writing, FlowCrypt for encryption) do that one job well and cheaply.

If the bottleneck is "I’m juggling four different extensions and still missing follow-ups," that’s the case for a bundled tool.

Mailbutler covers tracking, per-recipient scheduling, mail merge, shared-inbox-style collaboration, and signature marketing in one subscription, which is a reasonable trade for professionals and SMB teams that’d rather manage one bill and one settings panel than five.

It won’t replace a dedicated enterprise CRM like Streak’s higher tiers or a full support help desk like Gmelius at scale, but for the everyday email workflow most people are trying to fix, it’s one of the more complete options on this list.

Try Mailbutler today

Start your free 14-day trial. No credit card required.

Try for free Book a demo