The best email tracker depends on your inbox and what you need after the alert. Mailtrack is the focused Gmail option; Snov.io is free without a forced signature; Streak adds a Gmail-native CRM path. HubSpot fits CRM-first teams, Yesware spans Gmail and Outlook sales workflows, and Mailbutler covers Apple Mail.
Free extensions record pixel loads. Paid tools can add clicks, attachment analytics, campaigns, or CRM context. None turns an open or click into proof of attention or buying intent.
If those signals still leave the next step unclear, you may need sales collateral tracking, not another inbox extension. It shows what happened after the click: which proposal pages drew attention, whether the buyer returned, and where interest dropped.
Best email tracking tools by workflow
There is no useful universal winner. These are the best documented fits for seven common workflows using current pricing, product documentation, and published limitations.
| Workflow | Best documented fit | Why it fits |
|---|---|---|
| Lightweight Gmail tracking | Mailtrack by Mailsuite | Focused Gmail product with a free entry tier and three history levels |
| Free Gmail without a forced signature | Snov.io Email Tracker | The tracker is documented as free and unlimited, though retention is not published |
| Gmail-native workflow | Streak | Email and link tracking are free, with a paid CRM path inside Gmail |
| CRM-first tracking | HubSpot Sales Hub | Open and click events can sit on the CRM contact timeline, subject to plan gates |
| Gmail and Outlook sales workflow | Yesware | Open, link, attachment, presentation, and light campaign reporting share one inbox workflow |
| Apple Mail and mixed-client sending | Mailbutler | It has the broadest documented sender-client coverage in this shortlist |
| Small B2B CRM with team filtering | Salesflare | Email events, team filtering, and associated website activity live in one CRM |
Start with the inbox you actually use. Then decide whether you need a focused tracker, a wider inbox sales tool, or a CRM that stores the activity with the contact record.
Choose the layer before the vendor
Use an email tracker when an alert changes your next action. Add sales collateral tracking when activity inside a deck, proposal, one-pager, audit, or case study will shape the follow-up.
Email tracking software comparison
Prices below are public displays checked on August 25, 2026. Most use US dollars; Mailsuite annual pricing uses its localized euro display. Annual figures are monthly equivalents billed annually unless the table says otherwise. Taxes, promotions, negotiated terms, and plan changes can alter the total.
The relevant paid tier is the first tier that supports the workflow described here. It is not always the vendor's cheapest plan or the right bundle for a larger team.
How we compared these tools
This comparison uses current vendor product, help, pricing, and marketplace materials. Pricing and plan claims were checked on August 25, 2026. Apple, Google, and Microsoft documentation supplied the recipient-client limitations.
We compared supported clients, free limits, paid gates, history, alerts, branding, tracking types, self-open controls, proxy and scanner caveats, and the price of the relevant workflow. A feature marked as not published was not treated as absent or unlimited.
Validate finalists in your own inbox stack
Send the same controlled messages through each finalist using your team's inboxes, recipient clients, privacy settings, forwarding patterns, and security tools. Compare the raw events, filtered events, notification volume, and history before rollout.
Mailtrack by Mailsuite: best for lightweight Gmail tracking
Best for: a Gmail user who wants a focused tracker with a free starting point and simple history tiers.
Poor fit for: a team that expects the Outlook add-in to match the Gmail product.
Supported clients: the full product runs in Gmail through a Chrome extension, Gmail add-on, and mobile apps. Its Outlook add-in lacks desktop notifications, the full dashboard, individual tracking for multi-recipient emails, link tracking, and PDF analytics.
What it records: Mailsuite documents pixel-based open tracking. Link and tracked-PDF features vary by plan in Gmail. Keep those events separate from the basic open tracking available in Outlook.
History and alerts: Free records unlimited tracked emails but shows only the first open and adds a Mailsuite signature. Mailtrack shows seven days and removes the signature. Mailsuite provides full history.
Controls and ambiguity: Mailsuite suppresses documented self-opens when the sender views a message through supported environments. A view from another browser, device, or client can still register. Confirm suppression with the inbox setup your team uses.
Relevant price: Mailtrack showed $6.99/user/month on the US monthly view and €2.99/user/month, billed €35.88 yearly, on the euro annual view. Mailsuite showed $19.99/user/month on the US monthly view and €9.99/user/month, billed €119.90 yearly, on the euro annual view.
Before rollout: pricing changes with the selected currency and billing view. Confirm the checkout display for your market.
Snov.io Email Tracker: best free Gmail option without a forced signature
Best for: a Gmail user who wants a free open and link tracker without a forced vendor signature.
Poor fit for: Outlook or Apple Mail users, and teams that require a published retention guarantee.
Supported clients: Snov.io Email Tracker runs in Gmail through a Chrome extension and a Snov.io login. It is not an Outlook or Apple Mail tracker.
What it records: the Snov.io tracker page describes pixel-based opens, link clicks, push notifications, and a history panel inside Gmail.
History and alerts: the extension is free and unlimited, with no forced logo or signature. Its help page says users need to sign in again every three weeks. The checked sources do not publish how long history is retained.
Controls and ambiguity: you can disable tracking in the extension. Opening a sent message from another browser or device can count as an open. The documentation does not establish detailed proxy or bot-filtering behavior.
Relevant price: the tracker is $0. The separate Sales Suite bundles credits, recipients, warm-ups, and outreach tools but is not required here.
Before rollout: confirm retention before using Snov.io as a durable activity record, and review the extension permissions during security approval.
Streak: best for Gmail tracking with a CRM path
Best for: a Gmail-based seller who wants free tracking now and the option to add a Gmail-native CRM later.
Poor fit for: Outlook or Apple Mail teams, or buyers who only need a low-cost standalone tracker.
Supported clients: Streak works inside Gmail through browser extensions, with mobile access for the wider workflow. It does not support Outlook or Apple Mail.
What it records: Streak documents pixel-based opens. Email and link tracking are included on Free. Events can also appear on the CRM pipeline timeline.
History and alerts: tracking and view notifications are free. Free mail merge allows 50 sends per day, which is a sending limit rather than a tracking cap.
Controls and ambiguity: Streak documents per-link and global controls. Its self-open guidance says suppression depends on supported extension conditions. Other devices, privacy settings, and corporate tools can change the data.
Relevant price: tracking itself is free. Streak Pro displayed at $59 per user on monthly billing or $49 per user per month billed annually. Pro is the CRM upgrade, not the price of basic tracking.
Before rollout: confirm sender suppression and recipient-facing branding in a real compose-and-receive flow.
HubSpot Sales Hub: best for CRM-first tracking
Best for: a team that wants one-to-one email events stored with CRM contact and deal activity.
Poor fit for: a solo seller looking for inexpensive, unlimited click alerts without a wider CRM commitment.
Supported clients: HubSpot supports Gmail through Chrome, Microsoft 365 Outlook through its current Office add-in, and one-to-one email from HubSpot. The legacy Outlook desktop add-in is in maintenance mode.
What it records: HubSpot uses a pixel for opens and rewritten links for clicks. Events appear in the activity feed and contact timeline. A reply remains separate.
History and alerts: Free includes opens and 200 sales tracking notifications per month. One-to-one clicks require an assigned paid Sales Hub seat.
Controls and ambiguity: HubSpot says it excludes events identified as non-human and controls self-opens. That filter does not prove every remaining event is human. Forwarding does not reliably identify who opened the copy.
Relevant price: the checked pricing page displayed Starter at $20 per seat per month or a promotional $7 per seat per month billed annually. Free supports up to two users. Prices are dynamic and higher tiers add onboarding fees.
Before rollout: run forwarded-message and inferred-open scenarios against your notification rules. Recheck the displayed promotion before buying.
Yesware: best for Gmail and Outlook sales workflows
Best for: reps who want tracking, attachment reporting, presentation reporting, and light campaign work inside Gmail or Microsoft 365 Outlook.
Poor fit for: high-volume cold-email infrastructure or a team whose client environment falls outside Yesware's support requirements.
Supported clients: Yesware's installation guide requires current Chrome and Google-hosted Gmail. Outlook requires Microsoft 365 hosting and supported web or Outlook 2016 desktop environments, with specific build and update-channel conditions.
What it records: Yesware documents a pixel for opens. Link, attachment, and presentation activity have separate reports.
History and alerts: on Free, details are limited to emails under 24 hours old and 40 events. Pro has unlimited open, link, attachment, and presentation reporting.
Controls and ambiguity: Yesware documents message controls, sender suppression, and proxy or security filtering. Scanners and preloading can still create false events. Forwarding does not establish which person generated one.
Relevant price: Pro displayed at $19 per seat monthly or $15 per seat per month billed annually. Free campaigns allow 10 recipients per month. Pro allows 20. Unlimited campaigns and removal of Yesware branding start on Premium, not Pro.
Before rollout: confirm client support and filtering in your exact Gmail, Outlook, proxy, and security environment.
Mailbutler: best for Apple Mail and mixed-client teams
Best for: Apple Mail users and teams that send from a documented mix of Apple Mail, Gmail, and current Outlook clients.
Poor fit for: buyers who need Apple-recipient opens to mean that a person opened the message.
Supported clients: Mailbutler's client list covers Apple Mail on listed macOS versions, Gmail web, New Outlook, and Outlook web. Classic Outlook is unsupported. Its mobile app is a companion unless SMTP relay is configured.
What it records: Mailbutler documents a pixel for opens and records link clicks. Smart adds full history, per-recipient detail, device type, and approximate location.
History and alerts: Free Starter includes unlimited tracked emails and a visible Mailbutler watermark. Smart provides the fuller engagement view and removes the free-plan boundary for the comparison job.
Controls and ambiguity: Mailbutler provides message controls and self-tracking prevention. Business adds custom tracking domains and IP blacklisting, which cannot remove proxy-masked activity.
Mailbutler calls the product compatible with Apple Mail Privacy Protection. Its own MPP explanation also acknowledges false-positive opens. Compatibility does not turn the event into proof of human attention.
Relevant price: Smart displayed at $14 per user monthly or $11 per user per month billed annually in US dollars.
Before rollout: confirm client support and self-tracking behavior across recipient environments, including Apple Mail Privacy Protection.
Salesflare: best for a small B2B CRM with team filtering
Best for: a small B2B team that wants CRM records, email events, team exclusions, and website activity together.
Poor fit for: anyone seeking a free email tracker or a simple browser alert without a CRM.
Supported clients: Salesflare works with Gmail and Outlook through browser extensions and inbox sidebars. LinkedIn is a CRM sidebar, not an email client.
What it records: Salesflare uses a pixel for opens and rewritten links for clicks. Website activity needs its site script, account assignment, and a prior tracked-link association.
History and alerts: email and website events appear in the CRM. There is no free plan, but Salesflare documents a 30-day trial.
Controls and ambiguity: Salesflare provides global controls and per-email control in its composer. Its filtering documentation covers team activity, very fast events, duplicates, and known scanners. Some automation can still pass through.
An event associated with a CRM contact is not verified identity. The website setup also excludes unassociated anonymous visitors.
Relevant price: Growth displayed at $39 per user monthly or $29 per user per month billed annually. It has no published minimum seat count.
Before rollout: run scanner, proxy, and teammate activity through the configuration, then compare raw and filtered events.
How to choose email tracking software
Start with your actual email client
Client support removes bad options fast. Mailtrack, Snov.io, and Streak center Gmail. HubSpot and Yesware cover supported Gmail and Outlook setups. Mailbutler covers Apple Mail, but not Classic Outlook.
Check the provider, browser, desktop version, account host, and mobile behavior. An Outlook logo does not prove support for every build or mail host.
Separate tracking from deliverability
Low opens may be a delivery problem
Open counts cannot tell you whether a message reached the primary inbox, landed in spam, or was rejected. Check authentication, sender reputation, bounces, deferrals, and inbox placement first. Use the email deliverability guide for that layer.
Choose a tracker, inbox workflow, or CRM
A focused tracker handles open and click alerts. An inbox workflow adds attachments, presentations, campaigns, templates, and follow-up tools. A CRM earns its cost when activity belongs with contacts, deals, replies, and pipeline outcomes.
Pay for a CRM when your team will use the record and workflow around the event.
Check history, notification, and branding limits
Free differs by product. Mailtrack limits history and adds a signature. Yesware limits detail by age and event count. HubSpot caps notifications. Snov.io documents unlimited tracking but not retention.
Check signatures, watermarks, and plan gates. Cosmetic limits still matter in sales email.
Separate opens, clicks, attachments, and website activity
These events answer different questions:
- An open says the remote image request fired.
- A tracked click says a redirect or tracked URL request fired.
- An attachment or presentation report says the vendor's content-view event fired.
- Website activity needs a site script and a way to associate the visitor.
- A reply records an explicit response in the sender or CRM.
Choose the event you will act on. Do not assume one tracked event includes the others on the same plan.
Compare noise controls without treating them as proof
Look for message controls, self-open suppression, team or IP exclusions, duplicate handling, proxy guidance, and scanner filtering. Read the stated limitations too.
The most credible vendor documentation explains what still gets through. A filter can reduce noise. It cannot establish human attention on its own.
Check privacy requirements for your jurisdiction
Rules depend on jurisdiction, context, and configuration. The European Data Protection Board places pixels and tracked URLs within the technical scope of Article 5(3) of the ePrivacy Directive. France's CNIL and the United Kingdom's ICO publish guidance for their jurisdictions.
Ask qualified counsel how the rules apply to your recipients, purpose, consent model, and configuration. A vendor page is not a legal conclusion.
What an email open or click can tell you
Most email open tracking starts with a tiny remote image. When the recipient's client, privacy service, proxy, preview system, or security tool requests that image, the tracker records an event. The event proves the request reached the tracking server. It does not prove that a person read the copy around it.
Apple Mail Privacy Protection can download remote content in the background and hide the recipient's IP address. That process can create an open event without human engagement. Mailbutler's own documentation makes the same practical point even while describing its product as MPP-compatible.
Gmail serves external images through Google proxy servers, scans them, and limits what the sender learns about the recipient's computer and location from image loading. Google's current primary documentation does not support precise claims about every repeat-open caching pattern, so do not use a Gmail-derived location or repeat count as exact evidence of attention.
Clicks have a different mechanism but a similar interpretation problem. A tracking product usually rewrites the destination through a redirect. Security and preview systems can request or inspect that URL. Microsoft Defender Safe Links documents URL rewriting, scanning, time-of-click checks, and conditional background detonation. That does not mean every Safe Links check fires every third-party tracker. It does mean an automated request is possible and the surrounding security environment matters.
A click can be a scanner
A security tool can follow a tracked URL and create an apparent document view. Treat a near-instant click or view as a signal to inspect, not a reason to follow up aggressively. See why cold email clicks and deck views can be wrong for the post-click bot problem.
A reply is stronger because it is an explicit action, but it is still a separate signal. Keep reply rate and qualified replies in the sender or CRM. Use opens and clicks for alerts, history, and directional workflow decisions rather than as substitutes for replies or pipeline.
Identity needs the same restraint. A unique tracking token can associate activity with the intended recipient. If the email is forwarded or opened in another environment, the tracker does not reveal a known second person. A contact label is not verified identity.
The practical rule is simple: combine events. An open followed by a click, a reply, a return visit, and a CRM outcome gives you more context than any isolated pixel request. For the deeper mechanics, read why email read receipts do not prove reading. For campaign measurement, read why cold email open rates are unreliable.
Treat events as evidence, not verdicts
Email tracking still has value. Use it to record what fired, decide what to inspect, and time a sensible follow-up. Keep human attention, identity, and purchase intent as separate claims.
Email tracking vs sales collateral tracking: what to measure after the click
Email tracking covers pixel requests, tracked redirects, and replies. Sales collateral tracking starts after the click and records activity inside a deck, proposal, case study, or one-pager. The categories overlap, but they should not collapse into one engagement score.
HummingDeck is our product. It does not track inbox opens or send sequences. It tracks what happens after a prospect follows a personalized link to a case study, deck, one-pager, audit, or proposal.
Some products in this comparison already include attachment, PDF, presentation, sales-content, or website analytics. HummingDeck is a dedicated document-and-Room workflow, not the only product that can show content engagement. It complements an email tracker, sender, sequencer, or CRM instead of replacing one.
All HummingDeck plans include basic current view tracking, bot signals, and email notifications when a shared asset gets a qualifying view. Starter, Pro, and Business add per-page recorded time, completion, engagement flow, approximate geography, and supported click tracking. Pro and Business add the stakeholder map and viewer network for additional-viewer signals.
Those details still need careful interpretation:
- Recorded time is not proof of reading. An idle tab can add time.
- Bot filtering reduces known or likely scanner noise. It cannot prove that every remaining view is human or catch every automated event.
- Personalized and additional-viewer signals can reflect the intended recipient, a forwarded recipient, or another browser or device. They associate activity with a link, not a verified identity.
Send the thing you want to measure
Attachments become local copies after download. When engagement matters, share a personalized link instead. It preserves the email workflow while adding asset-level signals. See the guide to tracking email attachment opens.
Combine signals. A short first load is weak; several pages, a return visit, a relevant section, and a reply tell you more. See how to track prospect engagement after a cold email, then use the buyer intent signals guide to place those events alongside CRM activity.
Which email tracking tool should you choose?
Choose Mailtrack, Snov.io, or Streak when Gmail is the center of the job. Choose HubSpot when CRM history matters more than a low tracker price. Choose Yesware for a supported Gmail or Outlook sales workflow with attachment and presentation reporting. Choose Mailbutler for Apple Mail or a mixed-client sender setup. Choose Salesflare when a small B2B team wants email and associated website activity in one CRM.
Then match each question to the right system:
| Reader question | Appropriate system or signal |
|---|---|
| Did the remote image request fire? | Email tracker |
| Did the tracked redirect fire? | Link tracker, subject to automation and scanner noise |
| Did the prospect reply? | Sender and CRM |
| Which document pages loaded, and what activity was recorded? | A document-analytics product where the workflow fits |
| Did this influence pipeline or revenue? | CRM and downstream attribution |
The best stack often uses more than one layer. Keep the email tool for inbox events and replies. Add document analytics only when the message points to a substantive asset and page-level context will change the follow-up.
Frequently asked questions
What is the best email tracking tool for Gmail?
Mailtrack by Mailsuite is the strongest documented fit here for focused Gmail tracking. Snov.io is the free option without a forced signature. Streak adds a path to a Gmail-native CRM. Choose by history, branding, clicks, and CRM needs.
Which email tracking tools work with Outlook?
HubSpot, Yesware, Mailbutler, and Mailsuite document Outlook support, with different requirements. Mailsuite's Outlook add-in tracks opens but lacks its Gmail dashboard, link and PDF tracking, desktop alerts, and individual multi-recipient attribution. Check your version, mail host, and add-in requirements.
Can you track emails sent from Apple Mail?
Mailbutler supports tracked sending from Apple Mail on listed macOS versions. Apple Mail Privacy Protection can load content without a human open, so the event remains directional. Sender support does not remove recipient-side uncertainty.
Are email open notifications accurate?
Open notifications report that the tracking image was requested under the product's rules. They do not prove reading. Privacy services, proxies, blocked images, previews, self-opens, and security systems can create or suppress events.
Can email tracking tools detect a forwarded email?
A forwarded copy can produce another event without identifying who generated it. A second environment can also reflect another device, browser, proxy, or security system. Treat forwarding as one possible explanation, not a detected fact.
Can you track email attachment opens?
Some products replace or wrap an attachment with a tracked content experience. Yesware separates attachment and presentation reports from inbox opens. A normal attached file lacks the same visibility. Read the guide to tracking email attachment opens.
What is the difference between email tracking and document tracking?
Email tracking records message events such as remote-image requests and tracked redirects. Document tracking records activity inside a shared document, such as pages loaded, completion, or recorded time. Compare the category in our document tracking software guide.
Do email tracking tools also send sequences?
Some do. HubSpot, Yesware, Snov.io's wider suite, and Salesflare include broader sending or campaign workflows. Focused trackers center alerts and history. For sequencing, mailbox rotation, deliverability, and scaled outreach, use a cold email software comparison.
Related:
- Why email read receipts do not prove reading: understand the pixel mechanics behind an open alert.
- Why cold email open rates are unreliable: separate campaign measurement from individual notifications.
- Email deliverability in 2026: diagnose inbox placement before interpreting engagement data.
- Why cold email clicks and deck views can be wrong: understand how security scanners create false activity.
- How to track prospect engagement after a cold email: connect inbox activity to substantive sales content.
- Document tracking software compared: choose a product for the post-click document job.