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