InboxSDK
First usable API to write Gmail Apps for 1B active users
InboxSDK launched on May 21, 2015 with 508 votes, #19 of 3,670 launches that month and more than 99% of that year's launches. The site was still online in September 2026, 11 years on.
In plain words
InboxSDK is a developer tool that provides an API for building applications that integrate with Gmail. It enables developers to create and deploy custom functionality for Gmail's billion active users without requiring deep knowledge of Gmail's internal systems. The SDK handles the technical complexity of Gmail integration, allowing developers to focus on building their app's core features. It launched in 2015 and is designed for developers building email-based tools and extensions.
written from the facts on this page · September 2026
From the sources
The InboxSDK is high level Javascript library used to easily build browser extensions that interact with Gmail
Using the InboxSDK means no more lost time hacking Gmail's DOM. No more finding intricate selectors to insert your own UI. No more testing every configuration of Gmail to make sure everything still works. No more guessing how the compose area will appear. No more late nights when Gmail slightly changes their DOM. Instead, with InboxSDK, you interact with simple high level classes like ComposeView. You call straightforward methods (like adding buttons or getting the subject) on the class and the SDK abstracts the entire DOM away from you. Gmail is the standard communication platform for hundreds of millions of people. Plus, with millions of paid Google Apps users, applications built on the…from inboxsdk.com
Does a similar job
all alternatives →- OSOpen-Sourcing InboxSDK (YC S11) – Build Apps in Gmail2022 · ▲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,…
InboxSDK by Streak (YC S11) – Build Apps inside Gmail2015 · inboxsdk.com · ▲176The InboxSDK is high level Javascript library used to easily build browser extensions that interact with Gmail
Inbox Zero Tabs2025 · chromewebstore.google.com · ▲398Split inbox tabs for Gmail. 100% private. 100% free
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