Blynk Server is a remote server which is set up and ran by Blynk. Every user will have access to it for free. In an unlikely case when amount of requests will become enormously high, we might consider sharing costs with our users or limiting frequency of requests per user.
Local Blynk Server is an Open-Source software that you can install on your local machine. It's written on Java which means that it can be run anywhere where Java works. Even on Raspberry Pi. Running Local Blynk Server is for more experienced users, but we will provide step-by-step guidance for everyone.
In order to update the app and get new widgets, you will be required to connect to Blynk Server from time to time.