Is Firebase authentication expensive?

Enable Email Link sign-in for your Firebase project

Luckily, Firebase phone authentication offers such a system for Android and iOS, along with free quota for SMS verification messages (10,000 free per month) .

Expect to pay about $ 12.14 per month for an app with 50,000 installs and 5,000 daily active users . And about $ 292.02 per month for 1 million app installs and 100,000 daily active users, and approximately $ 2951.52 per month for 10 million app installs and 1 million daily active users.