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Dev tools · alternatives · 2026

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24 alternatives to Open sourcing my email sending startup

Hi all, I've posted a few times here about Maildown, a startup that I've been trying to validate lately. Due to lack of time to focus on this, I've taken the decision to abandon the project as a startup, but to make it available as an open source solution instead. The (still very basic) github repository is here: https://github.com/chris104957/maildown Maildown now exists as a simple CLI wrapper for Amazon SES which bakes in Markdown and styling support, making it much easier to get transactional mails up and running in any project Thanks for looking, Chris

Maildown is an open-source command-line tool that simplifies sending transactional emails by wrapping Amazon SES with built-in Markdown and styling support. Designed for developers integrating email functionality into… Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes. Prices are shown for the 1 we have checked on their own sites, 1 of them free or with a free tier. Open sourcing my email sending startup launched in 2019; newer entries below may have overtaken it.

  1. 1MM

    Hi, The beta program of my new startup, Maildown, is now complete and is now accepting paying customers: https://www.maildown.app As well as a lot of stability enhancements, we've added a new help system, a new CLI (https://github.com/chris104957/mailer-cli) and a REST API. Maildown lets you create transactional and marketing email campaigns using Markdown syntax, so you can generate and send your email content far more quickly than with traditional WYSIWYG editors. Thanks for looking, Chris

    2019 · its alternatives →

  2. 2

    A super simple CLI for sending emails. Contribute to chris104957/maildown development by creating an account on GitHub.

    2019 · github.com · its alternatives →

  3. 3MS
  4. 4IM
  5. 5

    The email warmup tool, upgraded for deliverability.

    Jun 2026 · mailwarm.com · its alternatives →

  6. 6

    Hi all! Excited to share cc.dev after months of work and refinement. The idea for this product came from trying to do email marketing for my side project, CubeDesk, a site where Rubik's Cube enthusiasts can time themselves, race with one another, train algorithms — it's a fun niche! With over 40k users, sending even a single campaign was becoming expensive with MailChimp. I knew AWS SES would be much cheaper, but it’s just an API with none of the other necessities you need for a robust email marketing platform. Beyond cost, I was also frustrated with having to make sure my database was…

    2023 · cc.dev · its alternatives →

  7. 7

    Hi all! Excited to share rss2newsletter after completing dev work for the initial release. The idea for this project came out of necessity, as I wanted to share my articles via email newsletter. I was looking for a super minimal, lightweight, and open source solution, and when none existed, I decided to create one. For any sizable number of email recipients, a popular platform like Mailchimp will easily cost you hundreds or even thousands per month in per-contact fees. rss2newsletter, on the other hand, allows you to use Amazon SES, so you can reach your audience at pennies on the dollar.…

    2024 · github.com · its alternatives →

  8. 8

    The easiest way to send simple newsletters

    2017 · buttondown.com · its alternatives →

  9. 9
    mjml.▲550

    The open source framework for responsive emails

    2016 · mjml.io · its alternatives →

  10. 10
    Ovy▲268

    One click AI-generated email replies for Gmail

    2022 · chromewebstore.google.com · its alternatives →

  11. 11

    CLI tool to write and send newsletters in Markdown

    2019 · github.com · its alternatives →

  12. 12

    Turn markdown into responsive, email-safe HTML that renders perfectly across every client.

    Mar 2026 · emailmd.dev · its alternatives →

  13. 13HW

    We recently launched a new project called https://www.markdownmail.io The motivations behind https://www.markdownmail.io was that we wanted to be able to occasionally send out an email to our user base. Currently we have over 100k subscribers and on average send an email once every other month. With the mailchimp it was costing us $475 per month. That's a lot of money to send an occasional newsletter. So we started to look for alternatives. We decided to move to sendy.co which is self hosted and uses SES. Whilst the costs where lower we found the product unstable and…

    2014 · its alternatives →

  14. 14
    Mailtrain▲323

    Self hosted newsletter app (Mailchimp clone)

    2016 · github.com · its alternatives →

  15. 15

    Create unlimited email aliases for free. Protect your real email from spam by using a different address for each service. Privacy friendly, anonymous replies.

    2019 · anonaddy.com · its alternatives →

  16. 16
    AhaSend▲132

    I'm the founder of AhaSend. We've built a transactional email service specifically for developers, with a Pay-As-You-Go pricing model ($0.50 per 1,000 emails) and up to 70% volume discount for platform partners. While there are many ESPs out there, we focused heavily on the Developer Experience to solve the pain of building and testing email flows: * The CLI: Heavily inspired by the Stripe CLI, we built a tool that lets you develop and debug locally. You can listen to webhooks, trigger events, manage your domains, and send / list / debug messages directly from your terminal. * True…

    2024 · ahasend.com · its alternatives →

  17. 17
    opensend.ccfree▲160

    The open source email platform that runs on your server

    22d ago · opensend.cc · its alternatives →

  18. 18

    Hey HN, I built an email deliverability SaaS with a RAG system. It's trained on all my knowledge and hundreds of real deliverability use cases from 4+ years experience as an Email Deliverability Specialist on Upwork. It solves a frustration problem a lot of businesses are experiencing. I'm looking for feedback so let me know in the comments.

    Aug 2026 · helloinbox.email · its alternatives →

  19. 19

    Hi all! I'm Kristyna, maker of Sidemail. I'd love to share with you what we've been building. We built Sidemail because sending emails from a SaaS app was way harder than it should be. Sidemail is made for developers and teams that want one simple place to handle SaaS emails with reliable delivery and no bloat. It has: - Everything for creating, managing and delivering SaaS emails in one platform, - Easy-to-use email API for sending password resets, receipts, etc. - Messenger for writing product updates and newsletters, - Email automations for onboarding and lifecycle flows, - Fast email…

    Nov 2025 · sidemail.io · its alternatives →

  20. 20

    I'm Rufus, one of the founders of Flowershow. We love markdown and use it everywhere from making websites, to docs, to knowledgebases. Plus AI splits it everywhere now. Got tired of the framework/config/deploy overhead every time we wanted to share a file or put a site online. So we built the thing we wanted. Files in. Website out. "Vercel for Content" is our aspiration - make deploying (markdown) content as fast, seamless and easy as Vercel did for JS. Command line plus you can connect to github repos, use Obsidian via plugin, or drag and drop files. npm i -g…

    Mar 2026 · flowershow.app · its alternatives →

  21. 21

    Everything you need to start sending newsletters, drip campaigns, transactional emails. Mailcoach is a fully featured email marketing platform built for growing creators, developers, and businesses.

    2020 · mailcoach.app · its alternatives →

  22. 22

    Build cross-platform emails using natural language.

    2025 · resend.com · its alternatives →

  23. 23
    Mailflow▲267

    Run your business from Gmail

    2020 · getmailflow.com · its alternatives →

  24. 24
    MailSlurp▲103

    End-to-end email testing made easy

    2018 · mailslurp.com · its alternatives →

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Ranked by how close each launch is in meaning, then by votes. Prices were read from each product’s own site when checked and can change. Refine with your own description →