Nango vs Nylas: Build vs Buy Email

Command references used in this guide: nylas email list, nylas email send, and nylas calendar events list.

What is the difference between Nango and Nylas?

Nango is integration infrastructure. It handles the OAuth handshake, token storage, and a sync engine for hundreds of third-party APIs, then exposes whatever those APIs return so you can build a feature on top. Nylas is a finished vertical API: it has already done the OAuth, sync, and normalization for email, calendar, and contacts, so you call one endpoint and get the same shape from Gmail or Outlook.

The split is where the work ends. Nango, an open-source project per the Nango docs, covers 400+ APIs but treats them generically — a Gmail message and an Outlook message arrive in their native shapes, and reconciling them is your job. Nylas covers six email and calendar providers specifically and returns one normalized model, so cross-provider code is written once.

What does Nango do well?

Nango is strong when you need integrations to many different APIs and want to own the data model. Because it's open source and API-agnostic, you can connect to a payments API, a CRM, and Gmail through one auth layer, and you're never limited to a fixed set of providers. For a team building a broad integrations marketplace, that flexibility is the draw.

It also removes the worst part of any integration: OAuth. Nango stores and refreshes tokens, handles the redirect flow, and runs scheduled syncs, so you skip the token-refresh code every provider forces on you. What it deliberately doesn't do is normalize email semantics — threads, participants, and folders differ by provider, and Nango leaves that mapping to you.

// Nango — managed OAuth, but you model the provider's raw response
import { Nango } from '@nangohq/node'
const nango = new Nango({ secretKey: process.env.NANGO_SECRET_KEY })

// Proxy a raw Gmail API call; you still parse Gmail's native shape
const res = await nango.get({
  endpoint: '/gmail/v1/users/me/messages',
  providerConfigKey: 'google-mail',
  connectionId: 'user-123',
})

How do Nango and Nylas compare?

The table compares both across seven dimensions. Nango leads on breadth of APIs and open-source control; Nylas leads on normalized email and calendar data you don't have to build. The overlap is OAuth — both remove it — but only Nylas also removes the per-provider modeling.

When should you use Nylas instead?

Reach for Nylas when email and calendar are the integration, not one of fifty. If your product needs to read a thread, send from a user's address, or book a calendar event across Gmail and Outlook, the normalized schema saves the weeks you'd spend mapping each provider's quirks on top of Nango's raw responses. The hard part of an email integration isn't OAuth — it's the modeling, and that's what Nylas ships.

The CLI shows the finished product in one session. After a single login you list a real inbox or calendar in about two minutes, with one set of commands that work identically against six providers. With Nango you'd have the token but still be writing the parser for each backend.

# Nylas — normalized data, no per-provider parser to write
nylas auth login --provider google
nylas email list --unread --json --limit 10
nylas calendar events list --json --limit 10

Which should you choose?

Choose Nango when you're building integrations to many different APIs, want open-source control, and are happy to own the data model — it's the toolkit for a broad integrations layer. Choose Nylas when email, calendar, or contacts is the feature and you want the normalization done across six providers. Some teams even run both: Nango as the general OAuth layer, Nylas for the email and calendar surface specifically.

The deciding question is whether you want to build or buy the email model. Building a wide integrations platform? Nango. Shipping an email or calendar feature now? Nylas. See the Merge.dev vs Nylas comparison for the back-office unified-API option.

Next steps

• Merge.dev vs Nylas — back-office unified API vs inbox unified API
• Email API authentication methods — OAuth, app passwords, and tokens
• Best email API for developers — the email vendor options compared
• Getting started — connect a provider and make your first call
• Front vs Nylas — shared-inbox app vs email API you build on
• Zapier Email vs Nylas — no-code automation vs a developer API
• Full command reference — every flag and subcommand documented