Sent a proposal?
See when a message shows activity and time the next note — without a CRM.
Email tracking Chrome extension for Gmail
Never wonder when to follow up.
See activity next to messages you send, then set a reminder for the right moment — without adding a CRM or another dashboard.
Chrome, Edge, Brave, Opera, Vivaldi · No account · History stays on this device
10 seconds
Send. See the cue. Follow up.
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Proposal — Acme Inc.
Just sent
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Same thread
Waiting
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Budget overview
Activity detected
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Your next step
Follow up tomorrow? Remind me
For mail that actually matters
Waiting on a client?
Set a reminder only if there hasn’t been activity yet.
Sent an important intro?
Get a cue when a message shows activity again, instead of refreshing Sent all day.
Built for freelancers, consultants, and one-thread follow-ups — not campaigns.
Privacy by design
Your email stays in Gmail
Subject, recipients, message content, and attachments never reach SentCue. Tracking requests use a random ID and timestamps — not the contents of your email.
Only a random ID and signal timestamps leave this device
On this device
Private and local
- Recipient and subject
- History and reminders
- Follow-up status
SentCue server
Minimal signal data
- Random tracking ID
- Signal timestamps
- No email content
Reflects this version. If a paid plan is added later, sync will remain optional and stay off until you turn it on.
See how your data is handledWhy SentCue
For emails that matter — not campaigns
Many email tracking tools now include accounts, dashboards, and CRM features.
Learn more
Email tracking guides and comparisons
Start with email tracking for Gmail or how email tracking works. Compare the best email tracking tools and the factual SentCue vs Mailtrack breakdown, then review privacy and control.
Questions
Common questions
Are activity signals proof someone read the email?
No. A blue circle means an activity signal was detected. That is not proof a person opened the message. For example, a mail provider or a security scanner can load pictures on its own, or you can create a signal by opening your own copy in Sent. How tracking works.
What about Gmail image proxies?
Gmail loads images through Google’s proxy. When the image loads after the Undo window, SentCue shows a blue circle in Sent, and known automated loads are filtered out. How tracking works.
What data leaves the browser?
Subject, recipients, message content, and attachments never reach SentCue. Tracking requests use a random ID and timestamps. History and reminders stay on this Chrome install. See exactly what SentCue stores.
Does it work on mobile Gmail?
It works in Gmail on a computer browser — Chrome, Edge, Brave, Opera, or Vivaldi. It does not work in the Gmail apps on iPhone or Android.
Does Scheduled Send work?
Scheduled Send is not tracked. The email still goes out at the chosen time.