nylas/nylas-mail

Analysis updated 2026-05-18

★ 24,762JavaScriptAudience · developerComplexity · 4/5LicenseSetup · moderate

Mindmap

mindmap
  root((repo))
    What it does
      Desktop email client
      Plugin extensibility
      Email syncing
    Tech stack
      Electron
      React
      JavaScript
      Flux
    Use cases
      Study Electron apps
      Build on forks
      Historical reference
    Key features
      Custom themes
      Snooze emails
      CRM integrations
      Send-later

mindmap root((repo)) What it does Desktop email client Plugin extensibility Email syncing Tech stack Electron React JavaScript Flux Use cases Study Electron apps Build on forks Historical reference Key features Custom themes Snooze emails CRM integrations Send-later

Click or tap to explore — scroll the page freely

What do people build with it?

USE CASE 1

Study how a large Electron and React desktop application is structured and architected.

USE CASE 2

Fork and extend the codebase to build a custom email client with your own plugins.

USE CASE 3

Learn how to implement a plugin system for desktop applications using JavaScript.

USE CASE 4

Understand email syncing patterns with local sync engines and cloud backends.

What is it built with?

ElectronReactJavaScriptFlux

How does it compare?

	nylas/nylas-mail	maboloshi/github-chinese	highlightjs/highlight.js
Stars	24,762	24,738	24,907
Language	JavaScript	JavaScript	JavaScript
Setup difficulty	moderate	easy	easy
Complexity	4/5	2/5	1/5
Audience	developer	developer	developer

Figures from each repo's GitHub metadata at analysis time.

How do you get it running?

Difficulty · moderate Time to first run · 30min

Electron app requires Node.js and npm, building from source takes time but is well-documented.

Use freely for any purpose including commercial, as long as you keep the copyright notice.

In plain English

Nylas Mail was an open-source desktop email client built to be highly customizable and extensible through plugins. The idea was that instead of being stuck with whatever features your email app ships with, developers could add new capabilities, like snooze, send-later, or CRM integrations, as plug-in modules, similar to how browser extensions work for Chrome. Under the hood it used Electron (a technology that lets you build desktop apps using web technologies like HTML and JavaScript), React (a popular JavaScript framework for building interfaces), and Flux (a pattern for managing app state). This meant the entire app was essentially a web app packaged as a desktop program, making it easy for JavaScript developers to customize or theme it. It handled email syncing through both a local sync engine and optional cloud backend services. It is worth noting that Nylas stopped maintaining this project in Spring 2017, so it is no longer actively developed by its creators. However, several community forks continue to develop and maintain variants of it. Someone would look at this repository today primarily for historical reference, to build on an existing fork, or to study how a large Electron and React desktop application was structured. The project runs on Mac and Linux.

Copy-paste prompts

Prompt 1

How do I set up Nylas Mail from this repository and build a custom plugin that adds a snooze feature to emails?

Prompt 2

Show me the plugin architecture in this Nylas Mail codebase and explain how to create a new extension module.

Prompt 3

What's the structure of the Electron main process and React components in Nylas Mail? How does Flux manage state?

Prompt 4

I want to fork Nylas Mail and add a CRM integration plugin. Where should I start in the codebase?

Prompt 5

Explain the email syncing mechanism in Nylas Mail, how does the local sync engine communicate with the backend?

Frequently asked questions

What is nylas-mail?

Open-source desktop email client with a plugin architecture, built with Electron and React. Lets developers customize and extend email features through add-ons.

What language is nylas-mail written in?

Mainly JavaScript. The stack also includes Electron, React, JavaScript.

What license does nylas-mail use?

Use freely for any purpose including commercial, as long as you keep the copyright notice.

How hard is nylas-mail to set up?

Setup difficulty is rated moderate, with roughly 30min to a first successful run.

Who is nylas-mail for?

Mainly developer.

Open on GitHub → Explain another repo

This repo across BitVibe Labs

Scan in gitsafehub Deploy in gitdeployhub nylas on gitmyhub

Verify against the repo before relying on details.