Doorbell.io allows you to gather feedback from app users and then forward it on to your issue tracker or your project management system. The Doorbell.io app has integrations with over 20 project management tools, and the app works on desktop devices, on iOS devices and Android devices too. Receive push notifications when you receive important or problem-related feedback, and the app allows users to capture screenshots that highlight their problems with your service, app or your software. Doorbell.io is like a help desk that works for your customers/users and for your project management staff. The host website says that the tool is free, but there is only a free trial, you have to pay a monthly subscription if you want to use the app going forwards.