Viral Agent.si

AI agents that help you write and send email newsletters

AI agents for email newsletters draft issues and outreach emails, rewrite AI-sounding copy so it reads like you, and send messages to subscribers or prospects. The 8 listed are agent apps with guided command-line setup, some running on a Claude or ChatGPT subscription you already pay for, plus skills that add writing and marketing know-how to an AI app. Of these, 7 are free and open source and none requires code.

Ranks for week 44 (Oct 26 to Nov 1, 2026). Data as of Nov 2, 2026.

  • Gaining the most momentum this week: Harvey, humanizer, and marketing-skills.
  • Easiest to start with (nothing to install, or adds to an AI app you already use): avoid-ai-writing and eCommerce-Skills.
  1. #1

    Harvey

    Harvey is an agent app that finds prospects, writes and sends cold emails, and books meetings for small businesses, using your existing Claude or ChatGPT subscription.

    Agent app Guided command-line setup Free and open source 3,963 GitHub stars

  2. #2

    humanizer

    Humanizer is a skill that rewrites AI-generated text so it reads like a person wrote it, for anyone publishing AI-drafted writing.

    Skill or plugin Install a desktop app or browser extension Free and open source 63.7k GitHub stars

  3. #3

    marketing-skills

    Marketing-skills is a set of 49 free Claude skills that guides Claude through marketing audits and tasks for Google Ads, Meta Ads, SEO, and AI visibility.

    Skill or plugin Install a desktop app or browser extension Free and open source 6,653 GitHub stars

  4. #4

    Franco

    Franco is an agent app that runs outbound sales emails for businesses, using a Claude Code or Codex subscription, so no separate model bill.

    Agent app Guided command-line setup Free and open source 918 GitHub stars

  5. #5

    MailCheap

    MailCheap is a newsletter app that charges only for emails sent, not dormant subscribers, for newsletter writers who want lower costs.

    Agent app Guided command-line setup Free tier plus paid plans 1,596 GitHub stars

  6. #6

    avoid-ai-writing

    Avoid-ai-writing is a skill that audits and rewrites text to remove common AI writing patterns for writers and marketers.

    Skill or plugin Adds to an AI app you already use Free and open source 5,373 GitHub stars

  7. #7

    eCommerce-Skills

    eCommerce-Skills is a set of free skills that give AI assistants e-commerce expertise for online sellers.

    Skill or plugin Adds to an AI app you already use Free and open source 1,314 GitHub stars

  8. #8

    OpenExecutive

    OpenExecutive is a self-hosted virtual executive team that drafts, advises, and follows up on business decisions for founders and busy leaders.

    Agent app Guided command-line setup Free and open source 5,725 GitHub stars

What these agents do

  • Writing and sending cold emails to prospects through your Claude or ChatGPT subscription
  • Rewriting AI-drafted newsletter copy so it reads like a person wrote it
  • Sending newsletters billed per email sent instead of per stored subscriber
  • Auditing drafts for common AI writing patterns before they go out
  • Booking meetings with prospects who reply to outbound emails

What to check before choosing one

  • Check whether it sends emails itself or only edits text you then paste into your newsletter tool.
  • Confirm the outbound apps can run on a Claude, ChatGPT, or Codex subscription you already pay for.
  • Compare per-email billing against your list size if many of your subscribers rarely open issues.
  • Test a rewriting skill on a past issue to see whether it keeps your voice, links, and formatting intact.

Related tasks