When comparing Semaphore CI vs Nevercode, the Slant community recommends Semaphore CI for most people. In the question“What are the best hosted continuous integration services?” Semaphore CI is ranked 7th while Nevercode is ranked 15th. The most important reason people chose Semaphore CI is:
Whenever a new push is made on GitHub or Bitbucket, Semaphore automatically runs tests on that branch.
Specs
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Pros
Pro Automatic Testing
Whenever a new push is made on GitHub or Bitbucket, Semaphore automatically runs tests on that branch.
Pro Free for open source
Semaphore supports open source and offers unlimited open source projects.
Pro Complete customer support
Semaphore offers all-around customer support for its commercial users.
Pro Free 100 builds per month for private projects
Semaphore offers 100 builds every month for private projects. This package is free for an unlimited time and offers: free & unlimited deploys, unlimited collaborators and running tests in parallel.
Pro GitHub integration
Projects can be imported from GitHub and Semaphore will automatically connect with that repository, once that's done, it will automatically trigger for every code commit.
Pro Docker support
Out of the box Docker support. Additionally, Semaphore can cache Docker images by using included docker-cache commands.
Pro Easy to configure
Semaphore is quite easy to configure and work with. It easily integrates with GitHub and a first build is only a few clicks away.
Semaphore is configured using .yaml configuration files which can be added from the web UI. There are a lot of tutorials out there that help developers configure Semaphore to their preference.
Pro Ability to run tests on real devices
Simulating or emulating tests is good - actually testing on real hardware is better as you'll catch device (manufacturer) specific issues that would kill your app ratings in the wild.
Pro Multiple integrations to cover your needs
Simplifies the instant access to the latest state of your apps.
Pro Easy to setup
There's no configuration files to write, nothing to download or install, nothing to really configure. Setting it up takes basically only adding your Git repository and waiting for the clone, build and test to finish.
Pro Focused on mobile app development
It's dedicated to mobile platforms and supports Andorid, iOS native apps + a couple of cross-platform frameworks such as Cordova and Ionic.
Cons

Con Proprietary with private project for $30/month
Semaphore is not free and nor is it open source. Pricing starts at $29 per month. However, there is a free option for private projects which have less than 100 builds per month and it's free for open source projects.
Con Project settings view could have a better UX to make it simpler for new users
Con Inflexible, can't implement multiple build tasks or target multiple modules
