Firebase maximum projects and apps
How many applications can I create in one project from a single account and how many projects I can create in Firebase for Cloud Messaging?
Answer
As of now (8 Dec 2017) I got a maximum of 5 projects
I got this message when I was creating new project and only had my 2 existing projects.
You're 3 projects away from the project limit.
I occasionally create a new Firebase project to test and learn its new features such as Firestore and Cloud Functions and then delete the project. Last month I tried creating a new project to learn Firestore and only had 2 existing projects, I've never got any project-limit message like this before. I think Firebase team just changed the project limit to 5 recently
Update 8 March 2018
My account reached the limit. I tried request another 10 projects to Firebase team and it took 1 business day to approve(sometimes it might take longer). I have to say that Firebase team is not mean. They are willing to help if they can.
I request a project limit increase and say I want another 10 projects because I'm starting my new startup(MVP) and want to keep the cost low at first. After the business generate money I will pay for Paid Services. Besides I told them how easy I can reach the limit as I have to create new projects to test Firebase features, like Firestore and Cloud Messaging before using the features in production. And finally they gave me another 10 projects :)
If you want to start a business with Firebase and have already reached the limit then Firebase team is going to help and give you project limit increase as long as you'r not a spammer.