One Email API
Any Provider

Connect your application to Gmail, Microsoft Outlook, and on-prem Exchange Server in minutes.

Build integrations faster. Win more customers.

One data model

Kloudless formats all objects with a Unified data model ensuring that request and response data structures are identical across connectors within each category.

One set of API endpoints

Kloudless abstracts away the differences between accessing each connector in a category by providing Unified API endpoints so a single API request format will work with all connectors within that category.

One authentication flow

Kloudless provides a single access token via a Unified OAuth flow to make authorized API requests on behalf of a user, unifying different auth mechanisms like OAuth, JWT, or password Authentication.

Mailbox Sync

Send and access emails from any mailbox

Simplify your application’s email integrations with Gmail, Outlook, and Exchange. The Unified Email API provides a single set of API endpoints and data models to send email as a user and retrieve full email content from a user’s mailbox, including attachments.

  • Send new mail and reply to threads
  • Search and Retrieve all existing and new mail
  • Access org-wide mailboxes via admin accounts
  • List contacts and co-workers
Activity Monitoring

React to new mail quickly

Kloudless offers a full-fledged Activity Monitoring API with reliable Webhooks and event bus support across all connectors, ensuring that your application tracks changes in your users’ accounts even if the upstream service doesn’t support webhooks or activity endpoints.

  • Real-time notifications for new emails received
  • Receive webhooks or event bus messages
  • Track org-wide activity via admin accounts
  • Monitor specific mailboxes

Everything you need to build and deliver powerful integrations

Unified Core Functionality

Authentication (OAuth 2.0), token management, full CRUD functionality, Search

Events and Webhooks

Live activity monitoring API endpoints give you the ability to track near real-time activity and changes.

Team API

Get admin access to an entire organization’s data, users, and groups with our Team API endpoints and user impersonation capabilities.

Unified Data Models

We unify objects into a single representation for each category of services.

Raw Data

Obtain data in its original format if you need access to unique objects that do not appear in our Unified Data Models.

Pass-through API

Access the full functionality of an upstream API via Kloudless. Kloudless adds default request parameters such as authentication headers.

Want to host on your own server?

Ensure the highest level of security compliance by deploying our full suite of SaaS integration products on-premises. Kloudless Enterprise is available as a Docker container, Amazon Web Services AMI, or OVA for deployment within your company’s private infrastructure.

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account today.

Frequently Asked Questions

What are some examples?

Kloudless specializes in helping solve several industry use cases across business applications, such as sales enablement, construction, and CASB. Learn more about other industry use cases and how we can help your application here.

What is the difference between you and Zapier / Workflow Automation?

Kloudless is entirely embedded within your application to increase stickiness. Your users will no longer be forced to leave your application to integrate with the services they need. Workflow automation is not an API. It is simply a tool for your customers to perform basic sync while Kloudless is used by your developers to enable synchronous interactivity for users to pull and push data on demand while using your application. Of course, Kloudless also enables automating data transfer as well. Read all about the differences between a Unified API and workflow automation here.

Do you ever leave data out of the unified response?

Services sometimes return objects with properties that are unique or custom to that specific provider, user account, or tenant. This is especially true of highly customizable environments such as CRM apps like Salesforce. However, Kloudless always provides the raw data returned from upstream HTTP responses, and even allows arbitrary requests to any upstream endpoint through the Kloudless Pass-Through API, while still handling authentication and keeping tokens refreshed.

How do I get started?

Sign up today for a free account and see how easy it is to provide your application with all of its API needs. Use our Postman Collection to easily test out each endpoint, or use our language-specific SDKs to quickly get started on integrating with Kloudless.

What is the benefit of Kloudless being embedded in my application?

Every product has its own UI/UX. Since Kloudless is embeddable, users can access any and all of their needed services inside of your application without ever knowing that Kloudless is there at all, increasing your application’s value, experience, and stickiness.

What are the most popular endpoints?

At a broad level, CRUD endpoints and change tracking are central to applications’ use of Kloudless. Keeping track of real-time events that occur in your end user’s cloud service is pivotal to providing your users with the information they need from your application. Kloudless provides this data through our exceptional Activity Monitoring (Events) API, Webhooks, AWS EventBridge partner source, and first-class support for Subscriptions. Kloudless also builds on top of these basic endpoints to support some of our popular advanced functionality and UI Tools, powering scheduling, file browsing, and data mapping use cases across a range of connectors.

How can we deploy Kloudless?

Your application can connect to Kloudless either through our hosted service at, or by self-hosting Kloudless Docker containers in your cloud or on-premises environments. We offer a range of different options for the size and scale of your application through either method. Learn more about your deployment options here.