Dev tools · alternatives · 2026

24 alternatives to Context.IO

API for email inboxes

Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes. Context.IO launched in 2015; newer entries below may have overtaken it.

1. 1
   Gmail API▲170

   Flexible, RESTful access to the user's inbox

   2014 · developers.google.com · its alternatives →

2. 2
   Inbox by Google▲1,147

   Next generation inbox

   2014 · google.com · its alternatives →

3. 3
   Postal▲231

   Open source mail delivery platform

   2017 · github.com · its alternatives →

4. 4
   InboxSDK▲508

   First usable API to write Gmail Apps for 1B active users

   2015 · inboxsdk.com · its alternatives →

5. 5
   ContextGram▲88

   Transform Your Email Experience With Contextual Intelligence

   2025 · its alternatives →

6. 6
   Mailchimp Pattern Library▲139

   The Mailchimp UI framework

   2015 · ux.mailchimp.com · its alternatives →

7. 7
   Mailmodo Email API▲244

   APIs to send automated interactive emails with forms

   2021 · mailmodo.com · its alternatives →

8. 8
   Handle▲229

   To-dos + Email + Calendar = Focus

   2015 · handle.com · its alternatives →

9. 9
   Turing Email▲112

   Making checking your inbox as fun as using Slack

   2015 · goo.gl · its alternatives →

10. 10
    Email Validator!▲193

    Free JSON API that gives you a simple way to validate emails

    2015 · garridodiaz.com · its alternatives →

11. 11
    Inbox for iPad▲140

    Google Inbox — now as an iPad app

    2015 · apps.apple.com · its alternatives →

12. 12
    Entro▲244

    The holy grail of email introductions

    2016 · entro.io · its alternatives →

13. 13
    Inbox▲175

    Next-generation email platform (pre-launch)

    2014 · inboxapp.com · its alternatives →

14. 14
    wuko.ai▲88

    Elevate your reading experiences with your email inbox

    2023 · wuko.ai · its alternatives →

15. 15
    Knowmail▲73

    Email and messaging Artificial Intelligence engine

    2016 · knowmail.me · its alternatives →

16. 16
    Other Inbox▲87

    App store for email

    2014 · its alternatives →

17. 17
    Avatar API▲85

    Put a name and face to that email.

    2020 · avatarapi.com · its alternatives →

18. 18
    Vocus.io▲133

    Take your Gmail game to the next level

    2016 · vocus.io · its alternatives →

19. 19
    API Plug▲168

    Hassle-free API generation & management

    2016 · apiplug.com · its alternatives →

20. 20
    Attachments.io▲59

    Easily Organize Your Email Attachments

    2014 · attachments.io · its alternatives →

21. 21
    IntroNet▲111

    Improving email intros

    2014 · its alternatives →

22. 22
    Missive▲132

    Collaborate right in your inbox

    2015 · missiveapp.com · its alternatives →

23. 23
    SupportYard▲87

    Organize emails and let your team respond from one inbox

    2015 · supportyard.com · its alternatives →

24. 24
    AppMail▲68

    The ultimate e-mail platform for developers

    2016 · appmail.io · 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 →