Alternatives to Substack in 2026

Listmonk knadh

High performance, self-hosted, newsletter and mailing list manager with a modern dashboard. Single binary app.

Complete system Production-ready You send newsletters to large lists and want to pay only for SMTP or SES instead of per-subscriber pricing.

★ 24k AGPL-3.0 Go Active, pushed yesterday

BillionMail Billionmail

BillionMail gives you open-source MailServer, NewsLetter, Email Marketing — fully self-hosted, dev-friendly, and free from monthly fees. Join the discord: https://discord.gg/asfXzBUhZr

Complete system Usable You want to run your own mail server and campaigns together and know how to manage IP reputation.

★ 16k AGPL-3.0 Go Slowing, pushed 5 months ago

Keila pentacent

Open Source Newsletter Tool.

Complete system Usable You want a simple self-hosted or EU-hosted alternative to Mailchimp for newsletters.

★ 2.3k AGPL-3.0 Elixir Active, pushed 2 days ago

SendPortal mettle

Open-source self-hosted email marketing. Manage your own newsletters at a fraction of the cost.

Complete system Usable You want cheap newsletter sending on your own server and already use a transactional email provider.

★ 2.2k MIT PHP Active, pushed 11 days ago

MailAccess KatrielMoses

Free email OSINT tool, 5000+ platforms, identity clustering, breach detection. No API keys required. pip install mailaccess

★ 1.7k MIT Python Active, pushed 6 days ago

Framework maizzle

The modern email development framework.

Framework or platform Production-ready Developers who know Tailwind want to code email templates in a build pipeline.

★ 1.6k MIT TypeScript Active, pushed 8 days ago

MailCheap marclou

Newsletters where you pay for the emails you send, not for dormant subscribers, at a fraction of the price of beehiiv and the like. Open source: self-host it, or use mailcheap.ai.

Complete system Experimental A newsletter with many inactive subscribers wants to cut costs compared with beehiiv or Mailchimp.

★ 1.4k AGPL-3.0 JavaScript Active, pushed 9 days ago

Email Templates ColorlibHQ

Free HTML email templates for Mailchimp and other emails services

Template or starter Usable You need a decent-looking email layout quickly and do not want to design from scratch.

★ 1.2k MIT HTML Active, pushed 2 months ago

Caniemail hteumeuleu

Can I email… Support tables for HTML and CSS in emails.

List, course or other material Production-ready You write HTML emails and need to check whether a feature works in Outlook, Gmail and others.

★ 948 MIT HTML Active, pushed 2 months ago

Notifo notifo-io

Multi channel notification service for collaboration tools, e-commerce, news service and more.

Complete system Usable Your product needs user notifications across channels and you want a self-hostable service rather than building one.

★ 883 MIT C# Active, pushed 43 days ago

Phplist3 phpList

Fully functional Open Source email marketing manager for creating, sending, integrating, and analysing email campaigns and newsletters.

Complete system Production-ready You want a proven self-hosted newsletter tool on ordinary PHP hosting.

★ 877 AGPL-3.0 PHP Active, pushed 14 days ago

Django CRM DjangoCRM

CRM and Task management software, Email marketing and many more. Django CRM software app is built for individual use by businesses of any size or freelancers and is designed to provide easy customization and quick development. ✨

Complete system Usable A small business with Python skills wants a CRM it can customise directly in Django admin.

★ 651 AGPL-3.0 Python Active, pushed yesterday

Warmbly warmbly

The largest open-source B2B cold outreach and email warmup service.

Complete system Experimental A B2B sales team wants self-hosted cold outreach instead of Instantly or Lemlist.

★ 492 Apache-2.0 Go Active, pushed 6 days ago

Colspan colspan-dev

Open source drag & drop builder for HTML emails that hold together in every inbox

Complete system Usable Marketers want to assemble email layouts visually without paying for a hosted builder.

★ 428 AGPL-3.0 TypeScript Active, pushed 4 days ago

Snooze thomasjohnkane

A package to simplify automating future notifications and reminders in Laravel

Building block Production-ready Your Laravel app sends time-based reminders and the delayed queue is not enough.

★ 937 MIT PHP Slowing, pushed 7 months ago

Email Marketing Bible CosmoBlk

Email marketing skill for Claude Code. 88K words, 908 sources, 19 industry playbooks. Install the skill and Claude becomes your email marketing expert.

List, course or other material Usable You want an AI assistant to draft email flows using a curated body of email marketing practice.

★ 330 MIT Active, pushed 24 days ago

Sympa sympa-community

Sympa, Mailing List Management Software

Complete system Production-ready An institution needs many discussion or announcement lists with delegated management.

★ 315 GPL-2.0 Perl Active, pushed 3 months ago

SendPortal Core mettle

Core functionality for SendPortal

Building block Usable You want SendPortal's campaign features inside your own Laravel application rather than as a standalone install.

★ 299 MIT PHP Active, pushed 21 days ago

MillionSend MillionSend

The open-source email platform — self-host on your own AWS SES, or use the cloud. Resend-compatible API.

Complete system Experimental You use Resend's API but want to self-host on SES to cut costs.

★ 258 AGPL-3.0 TypeScript Active, pushed 6 days ago

Thinkwithblack-skill backtrue

365 free AI marketing skills (zh-TW/en) for ChatGPT, Claude, Gemini, Claude Code & Cursor — copywriting, ads budget, margin, CRM, email. 365 個免費 AI 行銷 Skills

List, course or other material Experimental A Taiwanese or Chinese-speaking marketer wants a large set of ready prompts.

★ 249 MIT Python Active, pushed yesterday

Business-leads-ai-automation asiifdev

Open-source AI sales & marketing OS: find leads, draft outreach in your own voice, approve, close. Self-host or use alatpintar.id

Complete system Experimental A small agency, especially in Indonesia, wants self-hosted lead finding and outreach drafting.

★ 227 AGPL-3.0 TypeScript Active, pushed 8 days ago

EmailSpellChecker smashsend

📮 An ultratiny (1.9 KB) and fast JavaScript email checker to reduce users typing a wrong email. Written in TypeScript. Enterprise-grade.

Building block Usable Your sign-up forms collect emails and you want fewer bounced addresses.

★ 217 MIT TypeScript Active, pushed 3 months ago

Mailtrain Mailtrain-org

Self hosted newsletter app

Complete system Usable Only if you already run it; listmonk is a better-maintained choice for new setups.

★ 5.8k GPL-3.0 JavaScript Quiet, pushed 13 months ago

Angular Email Editor unlayer

Drag-n-Drop Email Editor Component for Angular

Integration Usable You are adding a visual email builder to an Angular product and accept Unlayer's terms.

★ 222 MIT TypeScript Slowing, pushed 7 months ago

Mjml-react wix-incubator

React component library to generate the HTML emails on the fly

Building block Usable Only for legacy code already using it.

★ 998 MIT JavaScript Quiet, pushed 4 years ago

Colossus vitorfs

Self-hosted email marketing solution

Complete system Experimental Only if you want a small Django codebase to adapt.

★ 576 MIT Python Quiet, pushed 3 years ago

Candymail bdcorps

Email Automations for Node.js

Building block Experimental Rarely; it has been idle since 2022.

★ 315 MIT TypeScript Quiet, pushed 5 years ago

LinkedIn Scraper TufayelLUS

A LinkedIn Scraper to scrape up to 1k LinkedIn profiles(due to LinkedIn limit) from company profile links and save their e-mail addresses if available! (actively maintained, if anything doesn't work, open an issue in the repo)

Developer tool Experimental Hard to recommend; scraping LinkedIn is the core of what it does.

★ 296 GPL-3.0 Python Quiet, pushed 16 months ago

Rss2newsletter ElliotKillick

Convert RSS/Atom feed to email newsletters

Developer tool Experimental A blogger wants a free RSS-to-email newsletter and is comfortable running a script.

★ 282 AGPL-3.0 Python Quiet, pushed 2 years ago

GTM Skills explorium-ai

GTM Skills for Claude & Codex

Integration Usable Your sales team uses AI agents for outbound and is willing to use Explorium's data.

★ 2 MIT TypeScript Slowing, pushed 3 months ago

Mailchimp Intuit

Utilize real-time user behavior data and artificial intelligence to convert more customers. Easy to use, get started for free!

Complete system Production-ready A small business or nonprofit wants a familiar email newsletter tool with lots of templates.

1k readers a month Since 2001 Commercial

Klaviyo Klaviyo

Klaviyo unifies marketing and service with its AI-first B2C CRM. Try our omnichannel marketing software, powered by K:AI agents to deliver personalised experiences across email marketing, WhatsApp and more.

Complete system Production-ready A Shopify or other online store wants purchase-driven email and SMS marketing.

839 readers a month Since 2012 Commercial

Constant Contact Constant Contact

With Constant Contact, you can create effective email marketing and online marketing campaigns to meet your business goals. Start your FREE trial today!

Complete system Production-ready A local small business or nonprofit wants simple email newsletters and values phone support.

286 readers a month Since 1995 Commercial

Brevo Brevo

Brevo is the most intuitive all-in-one customer engagement platform: email and SMS marketing, automation, CRM, live chat, and transactional email. Try it free.

Complete system Production-ready A small business, especially in Europe, has a large contact list but sends infrequently.

208 readers a month Since 2012 Commercial

ActiveCampaign ActiveCampaign

Go beyond marketing automation with ActiveCampaign's autonomous marketing platform. Your team of AI agents handles email, SMS, WhatsApp and more for you, backed by billions of data points.

Complete system Production-ready A small or midsize business wants sophisticated email automation at a price below HubSpot.

68 readers a month Since 2003 Commercial

Kit Kit

Kit (formerly ConvertKit) is the creator-first email marketing and newsletter platform. Grow your audience, automate campaigns, and sell without burnout.

Complete system Production-ready A creator or solo educator wants to grow a newsletter and sell digital products to subscribers.

Commercial

Campaign Monitor Marigold

Create, send, and optimize email campaigns with Campaign Monitor. Build audiences, automate journeys, and improve results with our best-in-class software.

Complete system Production-ready An agency or design-conscious brand wants well-designed email campaigns without enterprise complexity.

Commercial

MailerLite MailerLite

Digital marketing tools to grow your audience faster and drive revenue smarter. Backed by 24/7 award-winning support. Check it out now!

Complete system Production-ready A small business or creator wants capable email marketing at a low price.

Commercial

AWeber AWeber

Looking for free email marketing software? Get started with AWeber for free today. Powerfully-simple email marketing.

Complete system Production-ready A small business wants straightforward autoresponder email with phone and chat support.

Commercial

beehiiv beehiiv

beehiiv is the newsletter platform built for creators, publishers, and businesses. Grow, publish, and monetize your audience in one place.

Complete system Production-ready A newsletter writer or publisher wants growth and monetisation tools while keeping their own brand and list.

Commercial

Omnisend Omnisend

Complete system Production-ready A small online store wants e-commerce email and SMS at a lower price than Klaviyo.

Commercial