Leverage the Sinch SDK in your app to revolutionize communications. What will you build with real-time voice calling and instant messaging?

The Sinch SDK makes it easy for developers to add voice calling, instant messaging, and SMS to their applications. Build an iOS, Android, or web app and leverage the Sinch SDK to connect people all around the world.

To get started, take a look at our tutorials and documentation.

Download the SDK at www.sinch.com/downloads!

View full rules


$4,000 in prizes

Grand Prize

Win $1000 + $1000 of Sinch credits! Winner will be chosen by the judges.

Community Choice

Win $1000 + $1000 of Sinch credits! Winner will be chosen by the community.

Devpost Achievements

Submitting to this hackathon could earn you:


  • Individuals over 18 years in age
  • Minors over 13 may participate with a signed note from his or her legal guardian. Email to hello@sinch.com
  • Teams of up to 5 people


  • Screenshots of your iOS, Android, or Javascript app
  • A description detailing what the app does and why you built it
  • A way for us to see your code (ex: public Github repo)

How to enter

1. Click “Register” to join the challenge.

2. Keep an eye on the updates and submissions tabs throughout the competition.

3. Build an awesome iOS, Android or web app that uses the Sinch SDK.

4. Submit screenshots of your app, along with a short description.

5. Give us a way to see your code. (ex: link to public Github repo)

6. Submit your app before the deadline!


Daniel Forsman

Daniel Forsman
COO, Sinch

Andreas Bernstrom

Andreas Bernstrom
CEO, Sinch

Christian Jensen

Christian Jensen
Chief Developer Evangelist, Sinch

Jordan Hamel

Jordan Hamel
Developer Evangelist, Sinch

Judging Criteria

  • Use of Platform
    Does the application seamlessly integrate Sinch in a way that is beneficial to it's users?
  • Quality of Implementation
    Does the application comply with best practices for the implementation of the SDK? Is the application free of bugs?
  • Business Potential
    Would this app thrive in the competitive app market?
  • Looks
    Is the application visually appealing?
  • Bonus
    Extra points for using the Sinch​ calling functionality.