CMass — AI Gmail Campaigns + CRM

Tracking since Jun 2, 2026.

Changelog

• Jun 8, 2026
  description

  CMass brings AI-powered email campaigns directly into Gmail — no extra tools, no new dashboard, no Claude account needed.
  
  ✦ AI PERSONALIZATION POWERED BY CLAUDE
  Claude AI reads your contact data — name, company, role, any custom field — and writes a unique, natural-sounding personalized line for every recipient. Preview exactly what each contact will receive before you send. No Anthropic account or API key required.
  
  📊 GOOGLE SHEETS & CSV IMPORT
  Import from a Google Sheet directly from your Drive, or upload a CSV. Every column becomes an available merge tag. Duplicate detection, bounce suppression, and unsubscribe filtering happen automatically.
  
  📬 AUTOMATED FOLLOW-UP SEQUENCES
  Set up to 3 follow-up stages with custom delays and conditions. When a recipient replies, CMass detects it via Gmail and stops the sequence for that contact automatically.
  
  📈 REAL-TIME CAMPAIGN ANALYTICS
  See opens, clicks, replies, bounces, and unsubscribe rates as they come in. Per-recipient detail shows exactly who opened, when, and what they clicked.
  
  🛡️ DELIVERABILITY TOOLS BUILT IN
  One-click unsubscribe link on every email (CAN-SPAM compliant). Bounce tracking and suppression. Sending limits that respect Gmail's daily quotas.
  
  PLANS
  Free — 50 emails/day, unlimited campaigns, merge tags, follow-ups, analytics.
  Pro ($29/month) — 2,000 emails/day, AI personalization, priority support.
  
  Privacy policy: https://cmass.io/privacy
  Support: [email protected]

  CMass turns Gmail into an email-campaign tool and a relationship CRM in one — no extra dashboard, no new tab, no Claude account needed.
  
  WHAT CMASS DOES
  CMass adds a campaign panel and a lightweight CRM right inside the Gmail window you already use. Import a list, write a template, and send personalized bulk email — with A/B testing and automated follow-ups — then track opens, clicks, and replies without leaving your inbox. As people reply, CMass builds a CRM around them and keeps a running memory of every relationship. Powered by Claude.
  
  WHY CMASS IS DIFFERENT
  Most mail-merge tools stop at "insert {first_name}." CMass treats Claude as a relationship reasoning engine, not a line writer. It reads the history you have with each contact — who they are, what you've discussed, how warm the thread is — and helps you send mail that sounds like you actually know them. AI personalization is optional and OFF by default. You stay in control and flip it on per campaign only when you want the extra context.
  
  KEY FEATURES
  
  🤝 Built-in CRM, right inside Gmail
  Visual pipelines, contact records, linked email threads, tasks, and notes — plus a full email history with every contact. Add anyone as a plain contact, or promote them into a deal when it's an opportunity. Free on every plan.
  
  ✦ Relationship intelligence powered by Claude
  Open the in-Gmail side panel for a contact's relationship score, reply sentiment, talking points, and a one-click AI draft. CMass remembers your history so you don't have to.
  
  ⚗️ A/B testing with an automatic winner
  Test two subject lines or messages on part of your list. CMass watches open, click, and reply rates, then automatically sends the winning version to everyone else.
  
  💬 Reply management
  Replies are auto-sorted into Gmail labels (CMass/Replies), auto-responders are filtered out, and every reply lands on one screen with a one-click AI-drafted response. Turn labeling on or off anytime.
  
  📊 Import from anywhere
  Paste a list, upload a CSV, or connect a Google Sheet live. Every column becomes a merge tag. Duplicate detection, bounce suppression, and unsubscribe filtering happen automatically.
  
  📬 Automated follow-up sequences
  Add follow-up stages that fire only if a recipient doesn't reply — or send a campaign as a reply right into your existing thread with each contact. When someone replies, CMass detects it and stops their sequence automatically.
  
  📈 Tracking, exports & client reports
  See opens, clicks, replies, and bounces per campaign and per contact, with a per-link and by-domain breakdown. Export any campaign to CSV, or turn it into a polished, shareable report link under your own brand — and download it as a clean PDF on Pro.
  
  🎨 Brand Kits
  Set up your logo, colors, font, signature, and footer once, then flip one toggle to wrap any campaign in a clean, branded HTML shell.
  
  👥 Teams with a shared relationship pool
  On the Team plan, up to 5 teammates share one pool of contacts AND the relationship history behind them — not just a shared list of addresses. Everyone sees the same scores and talking points, unsubscribes are suppressed across the whole team, and team analytics roll every member's campaigns into one view. Invite teammates by email straight from the extension.
  
  🛡️ Deliverability built in
  One-click unsubscribe on every email (CAN-SPAM compliant), bounce tracking and suppression, reply detection, and sending limits that respect Gmail's daily quotas.
  
  PLANS
  Free — no credit card. Up to 50 recipients per campaign, merge tags, follow-ups, analytics, and the full built-in CRM.
  
  Pro ($29/month) — unlimited recipients, AI personalization, follow-up sequences, A/B testing, PDF client reports, and Brand Kits.
  
  Team ($49/month) — everything in Pro for up to 5 seats, a shared contact pool with shared relationship history, team-wide suppression, and team analytics.
  
  Checkout is handled through a secure, PCI-compliant payment processor. You only ever interact with CMass.
  
  🔒 PRIVACY & PERMISSIONS
  CMass requests Gmail access to:
  - Read the threads related to your campaigns (to detect replies, stop follow-up sequences, and build your relationship history)
  - Apply organizing labels to campaign replies in your inbox (e.g. "CMass/Replies") — you can turn this off anytime, and CMass never deletes your messages
  - Send emails on your behalf through your Gmail account
  - Access Google Sheets you select for contact import
  
  CMass does not sell your data. Email content is used solely to power your own campaigns and relationship insights and is not used to train AI models.
  
  Full privacy policy: https://cmass.io/privacy
  
  SUPPORT
  Website: https://cmass.io
  Documentation: https://cmass.io/features
  Email: [email protected]

• Jun 8, 2026
  short_description

  AI-personalized email campaigns, open/click tracking, and relationship intelligence — right inside Gmail.

  AI email campaigns + built-in CRM inside Gmail. Track opens, clicks & replies, and manage relationships without leaving your inbox.

• Jun 8, 2026
  name

  CMass — AI Gmail Campaigns

  CMass — AI Gmail Campaigns + CRM

• Jun 8, 2026
  permissions

  storage, alarms, tabs

  storage, alarms, notifications, tabs

Permissions & access

Permissions

storagealarmsnotificationstabs

Host access

https://mail.google.com/*, https://www.googleapis.com/*, https://api.cmass.io/*

Screenshots