Saving Data on Android

Pricing model
The Realtime Database is free — but that's only true up to a certain point. If you visit 
the Firebase pricing page, which you can access at 
https://firebase.google.com/
pricing
, you'll see, "Start for free, then pay as you go." Firebase is designed to work 
for free for smaller startups or experimental projects, like the one you will build in 
this section. You can see that Firebase offers additional pricing plans.
The Spark Plan is also free and exists so that everyone can experiment and get their 
hands on Firebase, integrate it into their apps and see how it performs. The majority 
of the money that Firebase makes comes from big apps with lots of users. All of the 
products that Firebase has are included in all the plans that they offer. This means 
that you can try out any product you want for free.
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When it comes to Realtime Database, the metrics that Firebase uses to decide how 
much to bill you for their services are the following:
1. Simultaneous connections: You can to have up to 100 simultaneous connections 
for free.
2. Data storage: You can store 1GB of data for free. Data in this context is text data 
and 1GB of text data is an enormous amount.
3. Downloaded data: You can download 10GB of data per month for free from the 
Realtime Database.
4. Databases per project: You are not allowed to have multiple databases per project 
for free.
To understand better Firebase billing and how to optimize Realtime Database usage 
you can check out official Firebase billing guidelines at 
https://firebase.google.com/
docs/database/usage/billing
.