GmailGPT
Gmail Email Writing
Write emails in 1 click using AI
Like Mailmerge-JS, GmailGPT is in the Gmail Email Writing category. Both are free. Worth comparing on the detail page.
We've curated 50 of the best alternatives to Mailmerge-JS, ranked by feature overlap, topic similarity, user ratings, and popularity. GmailGPT, AI Mail Assistant, and ChatGPT Mail Responder lead the list as the closest matches.
Updated May 18, 2026
The list includes 46 free alternatives, 3 freemium, and 1 with a free trial, so whether you're looking for a no-cost replacement or a more capable paid tier, there's an option to compare. Mailmerge-JS itself is free, which makes free alternatives the most natural starting point.
Many of these tools cluster around use cases like Free, Personalization, Email Automation, and Javascript — the same problem spaces Mailmerge-JS addresses. Cross-referencing tools that overlap on multiple topics gives a more reliable signal than category alone, because two products in the same category can still serve very different workflows.
Our ranking weighs eight signals: shared category, topic overlap, feature overlap, name and description text similarity (via PostgreSQL's pg_trgm and tsvector), Bayesian-smoothed user ratings, pricing-model match, popularity, and editorial overrides. Scores are then normalized within each tool's own candidate pool so the top match always represents the strongest available alternative.
Use the table of contents below to jump to free or paid alternatives, or scroll down to compare each option side-by-side with Mailmerge-JS.
Ranked by compatibility score
Gmail Email Writing
Write emails in 1 click using AI
Like Mailmerge-JS, GmailGPT is in the Gmail Email Writing category. Both are free. Worth comparing on the detail page.
Gmail Email Writing
ChatGPT AI for Gmail: Generate, summarize, translate, and improve emails.
46 free and 3 freemium options.
26 additional candidates
GmailGPT ranks as the highest-scoring alternative to Mailmerge-JS, based on shared category, topic overlap, feature similarity, and user ratings. Ratings are still being collected for this tool.
Yes — 46 fully free and 3 freemium alternatives are available, including GmailGPT, AI Mail Assistant, and ChatGPT Mail Responder.
GmailGPT is similarly priced (free) and sits in the same category (Gmail Email Writing). View its detail page to compare features, integrations, and reviews side-by-side.
Top Gmail Email Writing alternatives include GmailGPT, AI Mail Assistant, ChatGPT Mail Responder, and Hiwriter. These tools share the same primary category and have meaningful topic overlap with Mailmerge-JS.
Like Mailmerge-JS, AI Mail Assistant is in the Gmail Email Writing category. Both are free. Worth comparing on the detail page.
Gmail Email Writing
AI-powered Gmail assistant for faster, smarter responses
Like Mailmerge-JS, ChatGPT Mail Responder is in the Gmail Email Writing category. Both are free. Worth comparing on the detail page.
Gmail Email Writing
Generate perfect emails instantly with AI in Gmail
Like Mailmerge-JS, Hiwriter is in the Gmail Email Writing category. Both are free. Worth comparing on the detail page.
Gmail Email Writing
AI drafts Gmail replies automatically
Like Mailmerge-JS, Ready to Send is in the Gmail Email Writing category. Ready to Send is freemium, while Mailmerge-JS is free. Worth comparing on the detail page.
Gmail Email Writing
Automatically draft email replies, straight from Gmail.
Like Mailmerge-JS, Trimbox AI Assistant is in the Gmail Email Writing category. Trimbox AI Assistant is freemium, while Mailmerge-JS is free. Worth comparing on the detail page.
Gmail Email Writing
Gmail emails that write themselves? It's not magic, it's MailWizard.
Like Mailmerge-JS, MailWizard is in the Gmail Email Writing category. MailWizard is free-trial, while Mailmerge-JS is free. Worth comparing on the detail page.
Gmail Email Writing
AI learns from you and drafts answers to all your emails
Like Mailmerge-JS, Auto Gmail is in the Gmail Email Writing category. Auto Gmail is freemium, while Mailmerge-JS is free. Worth comparing on the detail page.
Email Replies
Reply to any email in 5 seconds with AI.
MailBuddy shares 3 topics with Mailmerge-JS: Gmail Integration, Free, and Email Automation. Both are free.
Email Writing
Craft personalized emails effortlessly with AI
AI Mailer shares 3 topics with Mailmerge-JS: Personalization, Free, and Email Automation. Both are free.
Email Replies
Generate personalized email replies.
ReplaiGPT shares 3 topics with Mailmerge-JS: Personalization, Free, and Email Automation. Both are free.
Email Writing
Create impactful emails effortlessly with AI.
MailGenerator shares 3 topics with Mailmerge-JS: Personalization, Free, and Email Automation. Both are free.
Images
Affordable AI image generation at scale.
Prodia shares 2 topics with Mailmerge-JS: Javascript and Free. Both are free.
Children's Stories
AI bedtime stories that bring kids' imaginations to life
SmartDreams shares 2 topics with Mailmerge-JS: Personalization and Free. Both are free.
Cover Letters
Craft captivating cover letters in minutes.
Cover craft shares 2 topics with Mailmerge-JS: Personalization and Free. Both are free.
Gift Ideas
AI-powered gift finder for perfect presents
Gift Ideas by Genie shares 2 topics with Mailmerge-JS: Personalization and Free. Both are free.
Book Recommendations
AI-powered book recommendations for any topic.
AI Bookstore shares 2 topics with Mailmerge-JS: Personalization and Free. Both are free.
Goals
Your new accountability buddy
Dewey: Your new accountability buddy shares 2 topics with Mailmerge-JS: Javascript and Free. Both are free.
Travel Itineraries
Personalized AI itineraries for your dream trip.
AI Trip Planner shares 2 topics with Mailmerge-JS: Personalization and Free. Both are free.
Movie Recommendations
AI-powered movie recommendations at your fingertips.
GPTflix shares 2 topics with Mailmerge-JS: Personalization and Free. Both are free.
Golf Assistance
Scan golf balls for instant insights and performance boost.
ScanMyGolfBall shares 2 topics with Mailmerge-JS: Personalization and Free. Both are free.
Chatting
Chat with ChatGPT directly, faster and without limits.
Chat Worm shares 2 topics with Mailmerge-JS: Personalization and Free. Both are free.
Music Quizzes
Create music video quizzes in clicks.
EpicMusicQuiz shares 2 topics with Mailmerge-JS: Javascript and Free. Both are free.
Chatgpt For Gmail
Boost email writing productivity and quality.
ChatGPT for Gmail shares 2 topics with Mailmerge-JS: Free and Email Automation. Both are free.
43 more free/freemium alternatives listed below. Browse all Mailmerge-JS alternatives ↓
49 free or freemium alternatives to Mailmerge-JS on /tools/mailmerge-js/alternatives.
Sveltron shares 2 topics with Mailmerge-JS: Javascript and Free. Both are free.
Flurry App shares 2 topics with Mailmerge-JS: Personalization and Free. Both are free.
SpeakSpots shares 2 topics with Mailmerge-JS: Personalization and Free. Both are free.
Neither Mailmerge-JS nor GmailGPT has user ratings yet — be the first to review either tool to help future visitors compare them.
