How to Build Your Own GMass
Replace GMass with a custom build. Easiest way to send an email campaign
Build Difficulty: 5/5
Build a working replacement in a weekend with AI tools
Estimated Timeline
Based on 41 features at Weekend Project difficulty, expect about One weekend with AI-assisted development.
Recommended Tech Stack
Full-stack React framework with API routes and server components
PostgreSQL database, auth, and real-time subscriptions
Utility-first styling for rapid UI development
Transactional and marketing email delivery
Key Features to Replicate
Top features across 8 categories. See all 41 features
Deliverability(9 features)
Settings for handling blocks in campaigns and follow-ups
Game-changing cold email sending server for improved deliverability
Achieve perfect deliverability with delivery routes optimization
Verify email lists and test links before sending to fix spam triggers
Rotate between multiple sending addresses to improve deliverability
+4 more in this category
Automation(7 features)
Set automatic follow-up sequences that send until recipient replies to boost response rates
Set a sending order to control which rows GMass emails first
Automatically categorize replies and bounces to prevent inbox clutter
Schedule mail merges for future times or set to repeat daily or hourly
Keep a strict count of days between auto follow-ups
+2 more in this category
AI(3 features)
AI creates custom HTML email layouts automatically
Have ChatGPT write your campaigns for you
AI-powered automatic spintax that creates variations for every email in your campaign
List Management(3 features)
Power campaigns with live Google Sheet data that updates automatically
Find email addresses inside Gmail account by searching and build lists from existing contacts
Upload a file of unsubscribed addresses to suppress list
Tracking(3 features)
Create custom tracking links with SSL encryption for campaigns
More accurate open rate detection and reporting
Replies and bounces are detected instantly
Core Functionality(2 features)
Send unlimited emails directly from Gmail using distribution technology to break Gmail's sending limits
Personalize emails using Google Sheet columns with fallback values and auto-detection of names
Integration(2 features)
API access for integrations and automation with Zapier
Read data live from any Google Sheet and send personalized emails, with automatic monitoring for new rows
Scheduling(2 features)
Set a daily end time for your campaign sending
Set a default time zone for better campaign scheduling
Cost Calculator
Keep Paying GMass
Build It Yourself
Total Cost Comparison
DIY hosting estimate based on Vercel + Supabase free/pro tiers (~$20/mo). Build time estimated from 41 features at very easy complexity.