Life & fun · alternatives · 2026

24 alternatives to Duo

A new way to see Responsive Web Development.

Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes. Duo launched in 2014; newer entries below may have overtaken it.

1. 1
   Duo▲72

   Dual-paned web browser for responsive web design.

   2013 · apps.apple.com · its alternatives →

2. 2
   Duet▲211

   A self-hosted alternative to Trello

   2016 · its alternatives →

3. 3
   Designeer▲150

   Bringing the best of the internet together

   Sep 2026 · designeer.xyz · its alternatives →

4. 4
   Turret▲115

   A Responsive Front-end Framework for accessible websites

   2015 · bigfishtv.github.io · its alternatives →

5. 5
   Relate 1.0▲343

   Create the web together

   2021 · relate.app · its alternatives →

6. 6
   Jottings▲95

   Real-time collaboration in Markdown

   2016 · its alternatives →

7. 7
   Frame.io 2▲196

   A radically reimagined way to collaborate on video

   2017 · blog.frame.io · its alternatives →

8. 8
   Front End Happy Hour – The State of Web Development▲60

   Thoughts on front end tools

   2016 · soundcloud.com · its alternatives →

9. 9
   TogetherJS▲70

   Add real time collaboration features to your website today.

   2014 · togetherjs.com · its alternatives →

10. 10DA
    Duo – a next-generation package manager for the front end▲168

    2014 · duojs.org · its alternatives →

11. 11
    Gravit▲154

    Design better, collaborate faster

    2014 · its alternatives →

12. 12
    Apache Weex▲127

    A framework for building mobile cross-platform UIs

    2017 · incubator.apache.org · its alternatives →

13. 13
    Squints▲81

    Design tools for the live web

    27d ago · squints.app · its alternatives →

14. 14
    Mixture▲90

    Frontend development tools made easy

    2013 · its alternatives →

15. 15
    Couple▲86

    An app for two

    2013 · couple.me · its alternatives →

16. 16
    Sitedrop▲83

    A visual way to collaborate using Dropbox

    2014 · its alternatives →

17. 17
    AIUX▲107

    A systematic UX design course for the responsive web

    2015 · learnaiux.com · its alternatives →

18. 18
    AniJS▲87

    UI Interaction Library for Web Designers in Plain English

    2014 · anijs.github.io · its alternatives →

19. 19
    Limitless▲90

    A productivity companion for Chrome

    2013 · chromewebstore.google.com · its alternatives →

20. 20
    Froont▲82

    Responsive web design, the visual way.

    2013 · its alternatives →

21. 21
    Collaborate on Slides▲99

    Shared editing and per-slide feedback on presentations

    2016 · slides.com · its alternatives →

22. 22
    Hawkee▲73

    A writing platform for web developers

    2014 · hawkee.com · its alternatives →

23. 23
    Layout - No One's Trying to Make a Shitty Website▲67

    How to work and collaborate with developers

    2016 · layout.fm · its alternatives →

24. 24
    Gridset▲75

    Web Layout Evolved.

    2014 · monotype.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 →