Gmail Add-on
Inspect any newsletter in Gmail™
One-click competitive intel on any marketing email. Detect the ESP, see the deliverability stack, inspect design and tracking. Everything renders in the Gmail sidebar — nothing leaves your inbox.How it works
1
Install
Get Newsletter Analyzer from the Google Workspace Marketplace.2
Open a newsletter
Click any marketing email in your Gmail™ inbox.3
Click Analyze
Hit the analyze button. Report renders in the sidebar in seconds.What you get
ESP detectionIdentifies the email service provider behind any newsletter — Mailchimp, Klaviyo, HubSpot, Mailgun, and 14+ more.
Deliverability stackSPF, DKIM, DMARC results, sending IP, bounce-domain split, RFC 8058 one-click unsubscribe detection.
Design intelHTML size, image count, dark-mode CSS, MSO conditionals, AMP for Email, dominant color palette.
Links & trackingClick-tracking host, UTM tags grouped by source/medium/campaign, unsubscribe URL, open-tracking pixel.
Copy analysisSubject length against best practices, body word count, reading ease score, CTA count, preheader extraction.
Privacy firstNothing is stored. Analysis runs only when you click. No data sharing, no third parties.
See it in action
The full report renders in the Gmail sidebar — no new tab, no new window. Each section is collapsible so you can drill into the details that matter for the email you're looking at.ESP detection with confidence score
Subject and body metrics colored against best practices
SPF / DKIM / DMARC results with pass/fail badges
Sending IP, bounce-domain split, List-Unsubscribe method
Color palette extracted from inline styles
UTM tags grouped by source / medium / campaign
For email marketers
Tear down competitor newsletters to see their stack. Benchmark your subject-line length, body length, and CTA count against the ones landing in your inbox. Identify which ESPs dominate your space.Identify the ESP behind any newsletter
Benchmark subject and body length
See competitor UTM tagging conventions
Spot trends across your subscriptions
For deliverability pros
Check SPF, DKIM, DMARC at a glance. See bounce-domain configurations, sending IPs, and List-Unsubscribe compliance — everything you need to reverse-engineer how a sender is set up.SPF/DKIM/DMARC pass/fail color-coded
First-hop sending IP from Received chain
RFC 8058 one-click unsubscribe detection
Bounce vs From domain split surfaced