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Alternatives

Products that do what OpenInbox.io does

📱 OpenInbox is now on Android

  1. 1
    Inbox by Googleâ–²1,148

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  2. 2
    Inbox Zeroâ–²821

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  3. 3
    QuiteInboxâ–²121

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  4. 4
    Inbox Zero Tabsâ–²400

    Split inbox tabs for Gmail. 100% private. 100% free

    2025

  5. 5
    Superinboxâ–²531

    Email vibing in your Gmail / Outlook

    Oct 2025

  6. 6
    SuperSMSâ–²85

    "Google Inbox" for SMS on Android (Only for India)

    2017

  7. 7
    InboxSDKâ–²508

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

    2015

  8. 8OS
    Open-Sourcing InboxSDK (YC S11) – Build Apps in Gmail▲257

    Hi HN! We’re Aleem, Chris, Borys, Meichen and Zach from Streak (YC S11) and today we’re open sourcing our InboxSDK https://www.inboxsdk.com, which makes it easy to build apps for Gmail. Over 1.8B users spend their days in Gmail! Having your app built into the Gmail workflow is a better user experience and gives you great user retention. InboxSDK gives you a high-level, declarative API to insert your UI into Gmail without having to directly manipulate the DOM yourself. End users install a browser extension to use your app. The SDK can add UI to multiple areas of Gmail. For example,…

    2022

  9. 9
    Front (for Android)â–²97

    The easiest way to work with team inboxes (on Android!)

    2017

  10. 10
    Inboxâ–²175

    Next-generation email platform (pre-launch)

    2014

  11. 11
    Tapfree for Androidâ–²120

    Voice dictation that adapts to what’s on your screen

    Feb 2026

  12. 12
    Inboxerâ–²212

    A clean, open-source desktop client for Google Inbox 💌

    2018

  13. 13NS
    NBox – Sign up anywhere without giving your email address▲286

    2017 · nbox.notif.me

  14. 14
    Boomerang for Gmailâ–²262

    The ultimate toolbox to control sending/receiving emails

    2014

  15. 15
    nBoxâ–²96

    Signup anywhere without giving your email address

    2017

  16. 16
    Spark for Androidâ–²296

    The much beloved email client now on Android

    2019

  17. 17
    Gmail for Android â–²85

    Big Android update introducing a unified inbox

    2015

  18. 18
    HookBoxâ–²120

    An Instant Webhook & Email Debugging tool for developers.

    Sep 2025

  19. 19
    ASO Tool Box by StoreMavenâ–²86

    Preview & download the creatives of any app, in any country

    2018

  20. 20
    Inbox When Readyâ–²116

    Protect your focus... hide your Gmail inbox by default

    2016

  21. 21
    Zendesk Inbox for iOSâ–²118

    Team up on email, anywhere your team goes

    2015

  22. 22
    Inbox by MessageBirdâ–²99

    Free omnichannel customer service software

    2020

  23. 23
    OpenInbox.ioâ–²1

    Disposable Email In Seconds

    Jan 2026

  24. 24
    Acompli (Android)â–²98

    Inbox that surfaces your most important email

    2014

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