One-click competitive intelligence for any newsletter in your Gmail™ inbox.
                                                                                                                                                                                                            
  Open any marketing email, hit **Analyze this message**, and get a structured breakdown of how the sender put it together — the email service provider, authentication setup, rendering details, link and  
  tracking patterns, and copy metrics.                                                                                                                                                                      
                                                                                                                                                                                                            
  ### What it extracts                                                                                                                                                                                      
                                                                                                                                                                                                            
  - **ESP detection** — Mailchimp, Klaviyo, HubSpot, Sendgrid, Customer.io, Iterable, Braze, Marketo, ActiveCampaign, ConvertKit, Beehiiv, Substack, Postmark, Amazon SES                                   
  - **Deliverability stack** — SPF / DKIM / DMARC results, sending IP, bounce-domain split, List-Unsubscribe method (URL / mailto / RFC 8058 one-click)                                                     
  - **Design facts** — HTML size, word count, image count, dark-mode CSS, Outlook conditional handling, max table width, AMP for Email presence
  - **Links & tracking** — link domains, click-tracking host, UTM source/medium/campaign summary, unsubscribe URL, open-tracking pixel host                                                                 
  - **Copy intelligence** — subject line, preheader, from/reply-to split, readability score, CTA count
                                                                                                                                                                                                            
  ### How it works                                                                                                                                                                                          
                                                                                                                                                                                                            
  Newsletter Analyzer runs only when you click the Analyze button on an open message. The add-on asks for minimal access — only the specific message you're looking at, only at the moment you request      
  analysis. Results render directly in the Gmail sidebar as collapsible sections.                                                                                                                           
                                                                                                                                                                                                            
  ### Privacy                                                                                                                                                                                               
   
  - **Nothing is stored.** Analysis runs per-click, never persists.                                                                                                                                         
  - **No third-party sharing.** Your messages never leave Google's infrastructure and your Newsletter Analyzer session.
  - **Minimal scope.** Requests only `gmail.addons.current.message.action` — the narrowest scope for this type of add-on.
                                                                                                                                                                                                            
  ### Who it's for                        
                                                                                                                                                                                                            
  Email marketers researching the competition. Newsletter operators benchmarking their stack against peers. Deliverability professionals reverse-engineering authentication setups. Designers studying      
  template patterns.                                                                                                                                                                                        
                                                                                                                                                                                                            
  Install once, then analyze any email in your inbox whenever inspiration or curiosity strikes.                                                                                                             
                                          
  Notes:                                                                                                                                                                                                    
  - Gmail™ on first mention only (Google trademark rule; don't repeat the ™)                                                                                                                                
  - ESP list included for keyword density — real marketers search specific ESP names
  - Privacy section up front — Google reviewers scan for this                                                                                                                                               
  - No comparative/spy/surveillance language (passes Marketplace review)
  - Scannable with headings + bullets — matches how people read store listings