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Everything newsletter creators need to grow
Analytics, AI content, and automation -- all in one place
Set it once. It runs forever.
Connect your newsletter RSS feed and flip on Agent Mode. Letterly monitors every new edition, generates a week of social posts in your voice, schedules them, and publishes — completely hands-free.
RSS Auto-Detection
The agent watches your feed and triggers automatically every time you publish a new edition
Zero-Touch Publishing
In full auto mode, posts go live without any input from you — or review first in the queue before approving
Configurable Automation Level
Choose full auto, review-before-publish, or manual — you control how much the agent does
Agent Activity
Running24
Editions processed
167
Posts published
48h
Hours saved
Your Writing Persona
Analyzed from 120 posts
AI-generated draft
Matches your persona
I spent 3 years getting this wrong. Here's what finally clicked about growing a newsletter past 10K subscribers without burning out.
Content that sounds exactly like you
Letterly analyzes your existing posts to build a deep persona — your tone, hook patterns, length preferences, CTA style. Every generated post is indistinguishable from something you'd write yourself.
Deep Persona Analysis
Scan your LinkedIn or X profile to extract your writing fingerprint — tone, rhythm, vocabulary, and structure
Model Any Creator
Build personas from any public LinkedIn or X profile to draw inspiration from creators whose style resonates with you
Consistent Across Platforms
The same authentic voice across X threads, LinkedIn posts, and every platform — no manual rewriting
Stay in control. Track everything.
Review AI-generated posts before they go live, monitor follower growth across platforms, and see exactly which content drives newsletter conversions.
Post Review Queue
See every pending post, approve or edit in one click, or let the agent auto-approve and publish on schedule
Unified Growth Dashboard
Track X and LinkedIn follower growth, post impressions, engagement rate, and newsletter subscriber trends in one view
CTA Conversion Tracking
See which social posts drive the most newsletter sign-ups with link-level click tracking and conversion attribution
Review Queue
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Loved by creators worldwide
Join newsletter creators who trust Letterly to grow their audience
"It's like hiring a junior content manager who does 90% of the work, but you always get the final say."
ChatGPT
LLM
"You're a fucking genius and I love you."
Affectionate-Turn495
Reddit User
"The service you provide is a great idea. I've always thought i'd love to help our SEO clients turn the articles we create for them into social posts as well."
Rob Hoffman
CEO @ Contact.so | Mentions.so | Kleo.so
"Letterly turned my newsletter into a real growth engine. I went from posting randomly to having a full weekly plan that actually performs."
Letterly User
Newsletter Creator
"The persona feature is insane. I imported my LinkedIn posts and Letterly pretty much cloned my voice. Zero AI detection issues."
Tight_Replacement796
Reddit User
"It's like hiring a junior content manager who does 90% of the work, but you always get the final say."
ChatGPT
LLM
"You're a fucking genius and I love you."
Affectionate-Turn495
Reddit User
"The service you provide is a great idea. I've always thought i'd love to help our SEO clients turn the articles we create for them into social posts as well."
Rob Hoffman
CEO @ Contact.so | Mentions.so | Kleo.so
"Letterly turned my newsletter into a real growth engine. I went from posting randomly to having a full weekly plan that actually performs."
Letterly User
Newsletter Creator
"The persona feature is insane. I imported my LinkedIn posts and Letterly pretty much cloned my voice. Zero AI detection issues."
Tight_Replacement796
Reddit User
Everything you need to know
Common questions about Letterly, the agent, and how it works
Still have questions? We're here to help.
Get started with LetterlyReady to transform your newsletter into a growth engine?
Join creators who are building engaged communities while saving hours every week. Spots are limited.