Alternatives

Products that do what Email marketing as code (open source Customer.io alternative) does

After getting frustrated with Customer.io's limitations, I built an open-source alternative that lets you write marketing automation in pure code. Define user segments in SQL, write email flows in TypeScript, and template emails in React+Tailwind. Support for campaigns, segments, events, users, and transactions. SMS support planned.

1. 1
   Unosend▲205

   Send transactional + marketing email w/ 99.9% deliverability

   Dec 2025

2. 2
   React Email 6.0▲91

   An open-source email editor you can embed in your own app

   Apr 2026

3. 3
   Codemail.io▲88

   Send emails with perfectly formatted code snippets

   2025

4. 4
   React Email 6.0 by Resend▲135

   Build, customize, and ship emails — all from your own app

   Apr 2026

5. 5
   Customer.io▲336

   Send email based on what people do (or don't do) in your app

   2014

6. 6
   Great Email Templates▲127

   HubSpot email templates for SaaS marketers

   2021

7. 7
   [Sending]flow▲191

   All-in-one Webflow email autoresponder

   2024

8. 8
   Marketing Automation by Freshworks▲123

   Smart marketing automation software for fast-paced teams

   2019

9. 9
   Dynamic Email Template▲114

   Generate email template code with dynamic JSON data or API

   2019

10. 10
    Apex▲216

    Smart email marketing automation to grow your business

    2024

11. 11
    Marketing Automation▲128

    Smart drip emails that increase conversion rates

    2015

12. 12
    Image Charts 2.0▲171

    Create and send beautiful charts in minutes

    2022

13. 13
    Free SaaS Template (GPT, Stripe, Auth)▲161

    A free React/NodeJS SaaS template for quick idea execution

    2023

14. 14
    Non Dumb Emails▲163

    Generate email sequence to onboard new users

    2024

15. 15
    RecipeUI▲143

    Open source type-safe Postman alternative

    2023

16. 16
    SendX 2.0▲277

    Growth tools & marketing automation for non-marketers

    2017

17. 17
    Marketing Email by Userlist▲215

    Marketing & lifecycle email in one place

    2021

18. 18
    Hexospark▲204

    Email automation + CRM designed to spark conversations

    2022

19. 19
    EmailJS▲176

    Send email directly from Javascript. No server code needed.

    2019

20. 20
    Warmer.ai▲212

    Generate personalized emails in seconds, written by AI

    2021

21. 21
    Palabra▲283

    No-code friendly workspace for your automated emails

    2020

22. 22
    EmailTemple▲78

    The AI studio for creating high conversion, on-brand emails

    May 2026

23. 23
    Warmy.io▲194

    Auto all-in-one tool to make your email channel reliable

    2022

24. 24
    Fireball▲163

    TailwindCSS email templates for SaaS & marketing

    2024

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