- Free tier: 1M messages/month, 100 queues, up to 20 concurrent connections, 10k queued messages
- Pros: offers replication, monitoring, administration interface; supports following hosting providers: AWS, Google, Digital Ocean
- Limitations: Allows maximum idle queue time of 28 days
- Free tier: Free first 10GB
- Pros: Replication, 10k messages per second, by default, millions per second and beyond, upon request. Integration with Google Cloud Dataflow for analytics.