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Pub/Sub

Google Cloud Pub/Sub is a fully managed messaging service for real-time event ingestion and delivery. · Google Cloud · Messaging

Overview

Google Cloud Pub/Sub offers scalable, managed publish/subscribe messaging for building event-driven systems, with a generous free tier for moderate workloads.

Good fit

Use when you need scalable, reliable, real-time messaging between services or components, especially for event-driven architectures.

  • event-driven systems
  • microservices
  • data pipelines

Not a fit

Avoid if you require strict FIFO ordering, extremely low latency, or want to avoid potential overage charges from high message volumes.

  • need strict FIFO
  • require on-prem deployment
  • have unpredictable high-volume spikes
Quickstart · 6 steps
  1. Sign up for a Google Cloud account and enable billing.
  2. Enable the Pub/Sub API in your Google Cloud project.
  3. Create a Pub/Sub topic in the Cloud Console.
  4. Add a subscription to your topic (pull or push).
  5. Publish a test message to the topic.
  6. Consume messages from your subscription.

Other free messaging options

Brevo · Messaging
300 emails/day · Store up to 100,000 contacts · 2,000 unique contacts can enter active automations
Billing risk: None
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MailerLite · Messaging
250 subscribers · 2,500 emails/month · 2 user seats
Billing risk: None
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Mailjet · Messaging
200 emails/day · 6,000 emails/month · Basic analytics
Billing risk: None
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Postmark · Messaging
100 emails/month · No overages allowed
Billing risk: None
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