Dev tools · alternatives · 2026

24 alternatives to Letterbox

Clean HTML email templates for creating stylish newsletters

Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes. Letterbox launched in 2021; newer entries below may have overtaken it.

1. 1
   HTML Email▲783

   Responsive HTML email templates for startups & developers

   2016 · htmlemail.io · its alternatives →

2. 2
   Templates by Email Monster▲448

   Hundreds of free, responsive email templates. Pick and edit.

   2017 · its alternatives →

3. 3
   Polybox Email Templates▲120

   Solution for email creating in coded templates and modules

   2020 · its alternatives →

4. 4
   Startup Emails▲434

   Responsive HTML email templates for startups

   2017 · htmlemailtemplates.net · its alternatives →

5. 5
   Responsive Email Templates▲310

   Ensure your email campaigns look good on any device with our responsive email templates.

   2012 · zurb.com · its alternatives →

6. 6
   Email Templates by Unlayer▲206

   600+ free no-code HTML email templates

   2021 · unlayer.com · its alternatives →

7. 7
   Modula Email Templates▲74

   Users interact more with emails, make them pretty

   2021 · figma.com · its alternatives →

8. 8
   Email & Newsletter Designs▲108

   Multi-purpose Figma designs for email and newsletter

   2021 · nextmockup.com · its alternatives →

9. 9
   Free Email Templates by cloudHQ▲186

   Copy any email you received as your own email template

   2019 · chromewebstore.google.com · its alternatives →

10. 10
    Stencil▲71

    Customizable email templates

    2021 · its alternatives →

11. 11
    Email Design for Newbies▲219

    A visual crash-course on email design

    2023 · mailmodo.com · its alternatives →

12. 12
    Email Design System for Sketch▲143

    Sketch file with 10 email templates for designers

    2018 · htmlemail.io · its alternatives →

13. 13
    Mailbites▲175

    Build email templates, faster than ever

    2023 · mailbites.io · its alternatives →

14. 14
    Speedy Newsletter▲100

    Email newsletter maker

    2022 · its alternatives →

15. 15
    Premium Email Templates by SendX▲105

    Free, ready-to-use premium templates built to convert.

    2018 · sendx.io · its alternatives →

16. 16
    Mail Designer 365▲145

    Create powerful, responsive email designs on your Mac

    2017 · maildesigner365.com · its alternatives →

17. 17
    Postcards by Designmodo▲157

    Create awesome emails with drag & drop simplicity 😻

    2018 · designmodo.com · its alternatives →

18. 18
    Typedd▲242

    Turn your social posts into blogs, newsletter & lead magnets

    2024 · typedd.com · its alternatives →

19. 19
    TOPOL.io▲146

    Beautiful HTML emails, made easy

    2022 · topol.io · its alternatives →

20. 20
    Notion-Style Newsletters▲142

    Send unlimited newsletters, like a Notion doc

    2023 · zaap.ai · its alternatives →

21. 21
    Boost CTOR▲122

    A variety of ready-made email marketing copy templates

    2020 · its alternatives →

22. 22
    Newsletter OS Template▲37

    Created to make designing, publishing newsletter easy as 123

    2024 · dubdproducts.gumroad.com · its alternatives →

23. 23
    Transactional Email Templates by Postmark▲210

    Open source email templates for use in your SaaS app.

    2018 · postmarkapp.com · its alternatives →

24. 24
    Mail Mastery▲88

    250 email templates to manage communication, issues & growth

    2023 · unapologeticih.gumroad.com · its alternatives →

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 →