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2. I have an app where users can create content e.g. write comments or chat. They might put some personal data there. Does this matter in terms of GDPR?
Yes, it matters, and this should be taken into account during your app planning & development because, according to GDPR guidelines, each user has the right to request the deletion of personal data that could lead to his or her identification.

You have no influence whether your app’ users place someone’s else personal data within your application. Subjects whose personal data was published without their permission should bulk mobile database have the opportunity to contact your Data Protection Officer (or the controller directly if there is no DPO). In such a case, they can send a request to delete such data from your system and you are obligated to provide them with such an option.

3. I use Google Analytics, Firebase, Crashlytics or HockeyApp as a 3rd party solution to support my development. Are they GDPR compliant?
You need to be sure that any 3rd parties solutions you use are GDPR compliant. You can confirm this in their Terms Of Service. For example, at the time we’re writing this post, Fabric claims to be ready for GDPR by May 25th, 2018.

GDPR resolution guidelines impose an obligation on us to check whether the services we use have security certificates in line with GDPR assumptions. According to regulations, we are jointly responsible for the leakage of personal data from third parties.