FCM免费计划：设备注册量及日消息发送量问询

Hey there! I get it—tracking down specific FCM limits in the official docs can feel like searching for a needle in a haystack. Let me break down the confirmed details for Firebase's free Spark Plan based on the latest official guidelines:

• Device Registration Limit: There’s no hard upper cap on the number of devices you can register with FCM under the free plan. That said, if your app sees an unexpected massive surge in registrations (like tens of thousands in a short window), Google’s automated security systems might flag your project for a quick review to prevent abuse. As long as you’re using FCM for legitimate, non-spammy purposes, you shouldn’t run into issues with device counts.

• Daily Message Send Limit: You can send a maximum of 1,000,000 messages per day under the free plan. This quota resets every natural day (based on your Firebase project’s timezone), and it applies to all message types sent via any method—whether you’re using the Firebase Console, REST API, or server SDKs. If you hit this limit, additional messages will be throttled until the quota resets.

If you need higher limits or more flexibility, upgrading to the Blaze (pay-as-you-go) plan removes the daily message cap entirely, and you’ll only pay for what you use beyond the free tier allocations.

内容的提问来源于stack exchange，提问作者mhk67