1. Mailtrack
Read receipts and link tracking for Gmail.
Why it replaces Mail Seen - Unlimited Email Tracker for Outlook: Covers similar ground in the Email category: Read receipts and link tracking for Gmail.
Best Mail Seen - Unlimited Email Tracker for Outlook Alternatives in 2026
Mail Seen - Unlimited Email Tracker for Outlook is a strong option, but it is not the right fit for everyone. Below are 10 alternatives compared on rating, install base, pricing and the use case each one actually wins on.
About Mail Seen - Unlimited Email Tracker for Outlook
Know when your emails are opened!
Free
Full reviewComparison at a glance
| Extension | Rating | Users | Pricing | Best for |
|---|---|---|---|---|
| Mail Seen - Unlimited Email Tracker for Outlook (original) | — | — | Free | Know when your emails are opened! |
| Mailtrack | 4.4 | 3M+ | Freemium | Salespeople and recruiters who need to know when an email was actually opened. |
| Google Mail Checker | 4.1 | 2M+ | Free | Displays the number of unread messages in your Google Mail inbox. You can also click the button to open your inbox. |
| Apollo.io: Free B2B Phone Number & Email Finder | — | — | Free | Apollo enables users to find contact info, connect with buyers, track emails, and more for free. |
| HubSpot Sales | — | — | Free | Email tracking, CRM for Gmail, and sales productivity tools in your inbox |
| Email Finder by ContactOut – Email Lookup Tool | 4.4 | 600K+ | Free | Find emails for 75% of Linkedin or ANY website. Save profiles to CRM. Chatgpt comments & email writer. Trusted by 76% of Fortune500. |
| Email Finder by Snov.io | 4.9 | 400K+ | Free | Find email addresses on any website. Our Email Finder lets you collect leads and grow sales on the go. |
| GMass: Powerful mail merge for Gmail | 4.8 | 400K+ | Freemium | A powerful mass email and mail merge system for Gmail. |
| WiseStamp Email Signature Chrome Extension | 3.9 | 200K+ | Free | WiseStamp email signature |
| ClickUp: Tasks, Screenshots, Email, Time | — | — | Free | ClickUp is a productivity platform that makes your personal and work lives more productive, saving you time. |
| Briskine: Email templates for Gmail™ | 4.5 | 100K+ | Free | Write emails faster! Increase your productivity with templates and shortcuts on Gmail™, Outlook, or LinkedIn. |
Mail Seen - Unlimited Email Tracker for Outlook alternatives in detail
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2. Google Mail Checker
Displays the number of unread messages in your Google Mail inbox. You can also click the button to open your inbox.
Why it replaces Mail Seen - Unlimited Email Tracker for Outlook: Covers similar ground in the Email category: Displays the number of unread messages in your Google Mail inbox. You can also click the button to open your inbox.
3. Apollo.io: Free B2B Phone Number & Email Finder
Apollo enables users to find contact info, connect with buyers, track emails, and more for free.
Why it replaces Mail Seen - Unlimited Email Tracker for Outlook: Covers similar ground in the Email category: Apollo enables users to find contact info, connect with buyers, track emails, and more for free.
4. HubSpot Sales
Email tracking, CRM for Gmail, and sales productivity tools in your inbox
Why it replaces Mail Seen - Unlimited Email Tracker for Outlook: Covers similar ground in the Email category: Email tracking, CRM for Gmail, and sales productivity tools in your inbox
5. Email Finder by ContactOut – Email Lookup Tool
Find emails for 75% of Linkedin or ANY website. Save profiles to CRM. Chatgpt comments & email writer. Trusted by 76% of Fortune500.
Why it replaces Mail Seen - Unlimited Email Tracker for Outlook: Covers similar ground in the Email category: Find emails for 75% of Linkedin or ANY website. Save profiles to CRM. Chatgpt comments & email writer. Trusted by 76% of Fortune500.
6. Email Finder by Snov.io
Find email addresses on any website. Our Email Finder lets you collect leads and grow sales on the go.
Why it replaces Mail Seen - Unlimited Email Tracker for Outlook: Covers similar ground in the Email category: Find email addresses on any website. Our Email Finder lets you collect leads and grow sales on the go.
7. GMass: Powerful mail merge for Gmail
A powerful mass email and mail merge system for Gmail.
Why it replaces Mail Seen - Unlimited Email Tracker for Outlook: Covers similar ground in the Email category: A powerful mass email and mail merge system for Gmail.
8. WiseStamp Email Signature Chrome Extension
WiseStamp email signature
Why it replaces Mail Seen - Unlimited Email Tracker for Outlook: Covers similar ground in the Email category: WiseStamp email signature
9. ClickUp: Tasks, Screenshots, Email, Time
ClickUp is a productivity platform that makes your personal and work lives more productive, saving you time.
Why it replaces Mail Seen - Unlimited Email Tracker for Outlook: Covers similar ground in the Email category: ClickUp is a productivity platform that makes your personal and work lives more productive, saving you time.
10. Briskine: Email templates for Gmail™
Write emails faster! Increase your productivity with templates and shortcuts on Gmail™, Outlook, or LinkedIn.
Why it replaces Mail Seen - Unlimited Email Tracker for Outlook: Covers similar ground in the Email category: Write emails faster! Increase your productivity with templates and shortcuts on Gmail™, Outlook, or LinkedIn.
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Frequently asked questions
What is the best alternative to Mail Seen - Unlimited Email Tracker for Outlook?
Mailtrack is the closest match. Covers similar ground in the Email category: Read receipts and link tracking for Gmail.
Is there a free alternative to Mail Seen - Unlimited Email Tracker for Outlook?
Yes — Google Mail Checker, Apollo.io: Free B2B Phone Number & Email Finder, HubSpot Sales are free.