Find the right email tracker for your inbox and workflow. This ranked guide compares 10 tools and explains what open and click signals can—and cannot—tell you.
Introduction
Email tracking tools show when someone may have engaged with a message you sent, helping you decide when to follow up and assess outreach. The useful signals depend on the tool: an open notification answers a different question from a link click, a reply, or a campaign-level report. Start by deciding which of those signals would change what you do next.
Then check whether the tool works with your email client—Gmail, Outlook, or Apple Mail—and whether you need personal notifications or a shared sales workflow. Treat opens cautiously: image blocking and automated image loading can make them misleading. A tracker earns its place in your inbox when its signals support a sensible next step, not when it produces the most alerts.
Key Findings
- Mailbutler is the strongest starting point for email tracking across Apple Mail, Gmail, and Outlook.
- Yesware suits sales representatives who track engagement and manage follow-ups from Gmail or Outlook.
- Streak is the better fit for Gmail users who want a shared pipeline inside their inbox.
- HubSpot Sales Hub connects tracked emails to CRM contact and deal records.
- GMass is suited to personalized Gmail campaigns, with reporting on opens, clicks, and replies.
- Email-open notifications can be misleading because of image blocking and automated image loading.
10 Best Email Tracking Tools, Ranked
Mailbutler is the strongest starting point if you need email tracking across Apple Mail, Gmail, and Outlook. For sales teams, Yesware offers a more focused follow-up workflow; for a Gmail-based pipeline, Streak is the better fit. This ranking weighs supported inboxes, the usefulness of tracking signals, what happens after a recipient engages, and each tool’s limitations.
1. Mailbutler
Best for: People who work across Apple Mail, Gmail, and Outlook.
Mailbutler adds tracking and follow-up tools to the inbox you already use. Its distinguishing advantage is client coverage: someone working in Apple Mail does not have to move to Gmail to get email-open notifications. It also combines tracking with message scheduling, reminders, templates, and contact notes, making it useful when the next action matters as much as the notification itself.
The upside is a consistent personal-email workflow across three major clients. The trade-off is that Mailbutler is an inbox productivity tool, not a substitute for a sales CRM or a campaign analytics platform. Choose it for individual correspondence and follow-ups across supported inboxes; choose a sales-focused tool if managers need to monitor a team’s deal activity.
2. Yesware
Best for: Sales representatives who send and follow up from Gmail or Outlook.
Yesware places email-open and link-click tracking inside the sales rep’s inbox, alongside templates, meeting scheduling, and outreach campaigns. That combination makes a click useful: a rep can see engagement and continue a structured conversation without transferring the contact into a separate sending interface.
Its strength is individual sales execution in Gmail and Outlook, rather than general-purpose mailbox organization. Its limitation follows from that focus: someone who only wants an occasional open notification may find the surrounding outreach workflow unnecessary. Teams that already work from another CRM should also consider how they want activity recorded before making Yesware the center of their follow-up process.
3. Mixmax
Best for: Gmail-based sales teams coordinating outreach and meetings.
Mixmax combines email tracking with sequences, templates, and meeting scheduling in a Gmail-centered workflow. It belongs high on the list because the tracking signal can feed a repeatable sales action: a rep can manage a sequence rather than manually decide when to send every follow-up. Link engagement is more actionable here than an isolated open alert.
The advantage is workflow depth for teams doing regular outreach. The drawback is fit: Mixmax is less compelling if the team’s primary working inbox is Apple Mail or Outlook, or if its members mainly send one-to-one correspondence rather than sequences. Pick it when coordinated follow-up is the job; pick a lighter tracker when notifications are enough.
4. HubSpot Sales Hub
Best for: Teams that want tracked emails connected to CRM records.
HubSpot Sales Hub connects Gmail and Outlook email activity with HubSpot’s contact and deal workflow. Email tracking sits beside templates, meeting links, and sales sequences, so a notification can be considered in the context of an existing contact record. That is the reason to choose it over a standalone tracker: the team needs a shared account history, not just alerts in one person’s inbox.
The trade-off is scope. Using a CRM introduces decisions about contact records, activity logging, and team process. If you do not intend to manage those records in HubSpot, much of the product’s value is beside the point. It is a strong fit for an established HubSpot workflow, not the simplest way to check whether one email may have been opened.
5. Streak
Best for: Gmail users who want a lightweight pipeline inside their inbox.
Streak builds a CRM directly into Gmail. Its email tracking and shared-pipeline features make sense together: a tracked message can be viewed alongside the deal, candidate, or other relationship the team is managing. That is a meaningful difference from an extension that only places a notification beside a message.
Streak’s advantage is keeping pipeline work close to correspondence, with less switching between an inbox and a separate CRM screen. Its clear limitation is Gmail dependence. It is a poor choice for an Outlook-first team, however appealing the pipeline layout looks. Choose Streak when Gmail is already the place where work gets managed and multiple people need visibility into its progress.
6. Saleshandy
Best for: Teams running outbound email campaigns across connected mailboxes.
Saleshandy is oriented toward cold-email outreach rather than occasional personal follow-ups. It brings tracking into a campaign workflow with sequences and reply management, helping a team judge engagement across an outreach effort instead of treating every open as a separate task. Gmail and Microsoft mailboxes can be connected for sending.
Its advantage is operational: outreach can be managed across mailboxes without making a browser extension the whole workflow. Its limitation is equally important. Campaign-level engagement does not replace careful review of replies or tell you that an individual prospect wants a call. If your work consists mostly of thoughtful one-to-one emails, an inbox-native tool will usually be a better fit.
7. GMass
Best for: Gmail users sending personalized campaigns from their mailbox.
GMass turns Gmail into a campaign-sending environment, with mail merge, follow-ups, and reporting on opens, clicks, and replies. Unlike a tracker built around one message at a time, its differentiator is showing how a larger send performs while keeping the sending workflow in Gmail. For example, reply information can help distinguish an actual response from a less conclusive open.
The strength is that campaign sending and tracking live in a familiar inbox. The limitation is the same architectural choice: GMass is for Gmail, not an Outlook or Apple Mail tracking solution. It also asks more setup and list discipline than a simple read-notification extension. Choose it for repeated Gmail campaigns, not sporadic correspondence.
8. Right Inbox
Best for: Gmail users who want tracking alongside everyday sending aids.
Right Inbox adds email tracking, reminders, recurring emails, templates, and scheduling to Gmail. Its appeal is the combination of small, practical functions: an open notification can sit beside a reminder to follow up, rather than becoming another alert the sender has to remember to act on.
That makes it a sensible personal-productivity choice for someone who does not need a CRM or a campaign system. Its main limitation is that it stays within Gmail, and its tracking is not the centerpiece of a broader team reporting workflow. Choose Right Inbox if your main frustration is managing your own follow-ups. If you need shared pipeline context, Streak or HubSpot is a more appropriate comparison.
9. Mailtrack (Mailsuite)
Best for: Gmail users who chiefly want to know when an email is opened.
Mailtrack, part of Mailsuite, is closely associated with read notifications in Gmail. Its narrow focus is the advantage: a sender who wants a quick indication of possible engagement does not have to adopt a CRM or build an outreach sequence. Mailsuite also offers email productivity features beyond the basic notification.
That simplicity has a boundary. An open signal alone gives little context about interest, and it is less useful for deciding which link or offer caught a recipient’s attention. Mailtrack is also a Gmail-centered choice, not the answer for someone who needs tracking in Apple Mail or Outlook. Pick it when the immediate question is “might they have seen this?” rather than “what should our sales team do next?”
10. Boomerang
Best for: People who care more about follow-up timing than detailed engagement reporting.
Boomerang is primarily an inbox scheduling and reminder tool. In Gmail, its read-receipt feature can add a tracking signal, while reminders help bring a conversation back into view when it needs attention. Boomerang also has an Outlook product, but its client-specific features should not be assumed to match Gmail’s.
The useful distinction is behavioral: Boomerang helps you remember to act even when no open notification arrives. Its limitation is that it is not the natural choice for link-click analysis, campaign reporting, or a shared sales pipeline. Choose it if unanswered messages are the problem you need to solve; choose a dedicated tracker when engagement detail is the priority.
Quick Comparison
| Tool | Best for | Supported inboxes | Tracking capabilities | |
|---|---|---|---|---|
| Mailbutler | Cross-client personal follow-up | Apple Mail, Gmail, Outlook | Email-open tracking | |
| Yesware | Sales follow-ups | Gmail, Outlook | Opens and link clicks | |
| Mixmax | Coordinated sales outreach | Gmail | Email engagement within sequences | |
| HubSpot Sales Hub | CRM-connected sales activity | Gmail, Outlook | Tracked email activity linked to CRM workflow | |
| Streak | Pipeline management in the inbox | Gmail | Email tracking alongside pipeline records | |
| Saleshandy | Outbound campaigns | Connected Gmail and Microsoft mailboxes | Campaign engagement tracking | |
| GMass | Personalized Gmail campaigns | Gmail | Opens, clicks, and replies | |
| Right Inbox | Personal follow-up management | Gmail | Email tracking with reminders | |
| Mailtrack (Mailsuite) | Straightforward read notifications | Gmail | Email-open notifications | |
| Boomerang | Scheduling and follow-up reminders | Gmail; separate Outlook product | Read receipts in Gmail |
How to Choose a Tracker—and Interpret Its Signals
Start with the inbox you actually use, then match the tracker to the job: individual follow-ups, sales outreach, or campaigns. Check where tracking works before relying on the results. An email tracker for Office 365, for example, may not behave the same way in Outlook on desktop, the web, and mobile.
1. For individual follow-ups, look for per-message notifications and an easy way to turn tracking off for sensitive correspondence.
2. For sales outreach, check whether click activity and replies can inform follow-up without treating every open as buying intent.
3. For campaigns, prioritize aggregate reporting over a stream of individual open alerts.
Most open tracking uses a tiny image called a tracking pixel. Privacy protections may load that image automatically, while image blocking may prevent it from loading at all; neither event reliably proves whether someone read the message. Tracked links record visits more directly, but a click still needs context. When assessing email deliverability, consider how added tracking links and sending practices affect messages—not just what the dashboard reports.
Conclusion
Choose an email tracking tool only after confirming it works with the inbox and sending setup you use. Then match it to the work: an individual sender may need a timely prompt to follow up, a sales team may need activity tied to shared sales follow-up workflows, and a campaign sender may need engagement insights across many messages. Mailbutler is a starting point for people working across Apple Mail, Gmail, and Outlook; Yesware is more focused on sales outreach, while Streak suits a Gmail-based pipeline. Whichever tool fits, treat opens and clicks as clues for your next action, not proof that someone read or understood your message.
Frequently Asked Questions
What is the best email tracking tool?
There is no single best email tracking tool for every inbox and workflow. Mailbutler is a starting point if you work across email clients, while Gmail users may find Streak or Mailtrack (Mailsuite) better suited to their setup. Compare client compatibility and the tracking features you will actually use before choosing.
What are the best email tracking tools for Gmail and Outlook?
For Gmail, consider Streak, Mixmax, GMass, Right Inbox, and Mailtrack (Mailsuite). For Microsoft Outlook, start with Mailbutler, Yesware, or HubSpot Sales Hub. Check that the specific feature you need works in your version of Outlook and on your device; support can differ between desktop, web, and mobile apps.
Is there an email tracking tool available for Office 365?
Yes, some email tracking tools support Office 365 mailboxes. Mailbox support does not guarantee that tracking behaves the same way in Outlook desktop, Outlook on the web, and mobile apps. Before adopting a tool, check its current compatibility information for the Outlook client and tracking feature you intend to use.
How do email tracking tools track opens and link clicks?
Email tracking tools commonly detect opens with a tiny image that sends a request when an email client loads it. To track clicks, they typically route links through a tracking address before sending the recipient to the destination. These events show that an image loaded or a link was followed—not that someone read or understood the message.
Why can email open notifications be inaccurate?
Email open notifications can be inaccurate because they depend on how the recipient’s email client handles images. Blocking images can prevent an open from registering even when someone reads the message. Privacy features that preload or proxy images can produce an apparent open without a deliberate read. Treat opens as signals, and consider replies and relevant clicks alongside them.
Can email tracking affect deliverability?
Yes, email tracking can affect deliverability because tracking pixels and redirected links add elements that receiving systems may evaluate. They are only part of the picture: sender reputation and message content also matter. Use relevant messages and trustworthy links, and watch delivery and engagement when you change your sending workflow.