Email is the data source. Context.IO is the tool. What you build with it is up to you!

Concours d'application de Context.IO

Welcome to the Context.IO App Challenge!

We have some major players in the VC / startup space (Fred Wilson, Brad Feld, David Cohen, Matt Blumberg, Joshua Baer) and $125,000 in cash prizes waiting to see what kinds of amazing consumer applications you can build with email data.

What is Context.IO? 

Context.IO is a RESTful API that makes it simple to connect to email servers and build apps on top of your user’s email data. And, it works with any email server that uses IMAP or Exchange* (That’s nearly all of them.)

What can I build? 

You may be wondering what you could possibly build with email data. Well, take a minute to think about all of the different things consumers use email for:

  • Storing receipts and coupons
  • Sharing photos and documents
  • Managing tasks and projects
  • Receiving notifications from other applications
  • Keeping track of travel itineraries and things to read
  • Managing relationships
  • Saving contact information
  • Collaborating with a group
  • Having discussions...and that’s just the beginning.

The possibilities for creating compelling applications are nearly limitless!

How do I start? 

Check out our resources page for examples of how existing apps have used email data, links to our docs and client libraries, and more information on beta features (Exchange support and receipt parsing).

Want help? You can contact our Senior Developer Evangelist, Tony Blank, at any time. We are available to help you out with any questions you have along the way.

Best of luck! We can’t wait to see what you create.

- The Context.IO team

View full rules


The challenge is open to:

  • Individuals who are 18+ years old or the age majority where they reside.
  • Teams of eligible individuals.
  • Teams of eligible individuals entering on behalf of organizations - (Organizations are eligible for different prizes depending on their size - make sure to read the official rules).
  • Most international locations. There are a few we couldn’t include due to legal restrictions. View the full list in our official rules.
  • Anyone involved in running this contest is not eligible. This includes employees of Context.IO, Return Path, ChallengePost, affiliates, or immediate family of those employees. We want to keep this fair for all of our participants. View the official rules for more detail.
  • There may be additional prize-specific eligibility requirements.
  • Please view the official rules for full details on eligibility.


Create an app that uses the Context.IO API or update an existing app to integrate the Context.IO API.

  • Register for the Challenge on the Challenge website.
  • Register for an API key on the Context.IO website.
  • Agree and adhere to the Context.IO Terms of Use and Privacy Policy.
  • Be the original work and solely owned by the submitter, and not violate the IP rights of any other person or entity.
  • Create a video that, in five minutes or less, clearly explains and demonstrates your application.
  • Must run consistently on the platform of choice and function as depicted in the video.
  • Be in English, or provide English translation for all materials submitted.
  • New and existing apps:
    • Must be a new application, or
    • Integrate the Context.IO API after the start of the submission period, or
    • Have less than 100 users at the start of the submission period.
    • Existing Applications that used the Context.IO API prior to the start of the Challenge submission period and had more than 100 users are only eligible for the “Best User Growth in an App During the Submission Period” prize.
  • There may be additional prize-specific submission requirements.
  • Please view the official rules for full details on requirements.


Fred Wilson

Fred Wilson
Managing Partner, Union Square Ventures

Brad Feld

Brad Feld
Managing Director, Mobius Venture Capital and Foundry Group

David Cohen

David Cohen
Founder and Managing Partner, Techstars

Matt Blumberg

Matt Blumberg
Author of Startup CEO and Co-Founder, CEO, and Chairman of Return Path

Joshua Baer

Joshua Baer
Founder and Executive Director, Capital Factory

Judging Criteria

  • Quality of Idea
    Is the idea creative and original?
  • Implementation of Idea
    Was the idea well executed by the developer? Does the application use multiple endpoints that the Context.IO API provides?
  • Potential Impact
    Does the application solve a specific problem or paint point for its users?
  • Market Readiness
    Is the application market ready? Is it available in a public, online store? Has the application been localized for international markets?