Continuous Integration - a cloud solution?

Question

Continuous Integration

There is a project (even several) that can be built for iOS, Android, OSX, Windows. I would like to implement Continous Integration - so that any change to the Mercurial repository causes a rebuild, if possible, of all these builds. There is no way to keep your own server, so cloud solutions are being considered. However, I can't find a service with the required parameters:
- bitbucket/mercurial support - building
C++ code under OSX/iOS/Android/Windows (these may be different services)
Are there any other options?

Answer 1

There is Atlassian Bamboo ( https://www.atlassian.com/software/bamboo), which can be delivered as a cloud solution or traditional CI. Of the obvious advantages - excellent integration with Atlassian products, including BitBucket.

Answer 2

https://travis-ci.org