Build a Blockstack application that fits into one of the featured categories – and isn't evil

We no longer have to simply trust large companies to respect and protect our personal data. Push a new era forward by building Blockstack apps that Can't Be Evil. $15,000 in cash prizes and experiences are up for grabs!

Can't Be Evil

Join Blockstack in moving the internet forward! We're looking for developers & entrepreneurs that want to help end data breaches, predatory ad models, and the commoditization & abuse of individuals' digital identities. Enter the 'Can't Be Evil' contest by submitting an app that is private by default, leaves the user in full control of their data, and protects their fundamental digital rights. In other words, submit a Blockstack app and take your first steps into a growing ecosystem that is flipping the status quo on its head.


You can win in up to two categories with a single entry.
Most Creative Use of Lightning
Brought to you by the Lightning Network, Founder and CEO Elizabeth Stark will be looking for the most creative use of Lightning in your dapps.
Most Useful Daily
Brought to you by, the top dapp in this category will be determined by CEO Kyle Lu. His team will choose the app they find most useful on a daily basis. 
Most Dappy
Judged by Brandon Kessler from Devpost, this award will go to the applications that best leverage and showcase the advantages of decentralized apps. 


Elizabeth Stark, CEO & Co-founder, Lightning Network
Most Creative Use of Lightning
Elizabeth is a huge fan of open source, decentralized protocols. She taught at Stanford and Yale where her students studied peer-to-peer technology, privacy, open source software, and memes. She has been an active contributor to the bitcoin community, an advisor to startups in areas ranging from cryptocurrency to decentralized technology to AI, and is a fellow at Coin Center. She has a law degree from Harvard and is an avid listener of electronic music.
Kyle Lu, Founder & CEO,
Most Useful Daily
Kyle is a serial entrepreneur specialized in technology transformation, innovation and ecosystem expansion.Kyle is the founder and CEO of, the largest Dapp Store to allow discovery and use decentralized apps. He was the former partner and VP global ecosystem for Achain. He had incubated over 10 dapps and took Achain from a Chinese project to a global blockchain with a top 80 market cap. Being an evangelist for dapps, Kyle is also an author for Hackernoon, Good Audience etc. and a regular speaker for dapps market analysis and blockchain adoption.
Brandon Kessler, CEO, Devpost
Most Revolutionary Application
Brandon Kessler is the founder and CEO of Devpost, which powers most of the worlds hackathons, and whose mission is to inspire the world's software developers. Prior to that, Kessler founded independent record label Messenger Records which was repeatedly singled out for its early embrace of the internet and its creative use of grassroots promotions.

Judging Criteria

Resources (Get Started!)

We've collected the best getting started resources right here. If you need anything else, please join us on Slack with the button to the right or contact, we'd love to help you!


Visit the FAQ


View full rules


Apps submitted to the Can't Be Evil Contest must also qualify for App Mining, so the submission requirements for that program, as displayed below, must be met. Learn more about App Mining.

Requirements: Your app should integrate Blockstack authentication for logging into your app. Your finished app should be available to the public for use. The application must use a registered domain name and the app should be hosted at a URL belonging to the domain. The app website must use a secured (https) connection.

How to enter

Entering is easy:

  1. Register here on DevPost
  2. Build your app, taking note of the three categories
  3. Finish by submitting your app to App Mining at

Tip: Learn to build a dapp in less than 60 minutes with the Zero-to-Dapp tutorial


Elizabeth Stark

Elizabeth Stark
CEO, Cofounder - Lightning Network

Kyle Lu

Kyle Lu
Founder & CEO,

Brandon Kessler

Brandon Kessler
CEO - DevPost

Judging Criteria

  • Judging Overview
    Judges will pick the best app submitted to their category by scoring on three criteria from 1-5. Uniqueness and User Experience are shared criteria, the third is unique to the category. More:
  • All | Overall User Experience
    Is the app easy to use? Does the interface make sense? Is it easy to get started and setup?
  • All | Uniqueness or innovative
    Are there other readily available apps that I can accomplish the same result with? Does the app allow the user to accomplish something new? Does the app have a unique or new business model?
  • Category | Lightning - Most Creative Use of Lightning
    Importance of Lightning to the App: Is Lightning a critical component of the app? Does the app use a payment model that would much more difficult or impossible with a traditional payment gateway?
  • Category | - Most Useful Daily
    Daily usefulness: What are the types of apps you can't live without? What apps do you find yourself using multiple times a day? Which app would have the highest impact on your daily life if it went away?
  • Category | DevPost - Most Dappy
    Importance of Decentralization to App: Are there functions available in the app that couldn't be duplicated in a centralized app? Does the core value hinge on the app being decentralized? Does it use a business model made possible by decentralization?