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Ably vs Fly.io: 2026 Comparison

Ably Fly.io
Overview A realtime messaging infrastructure platform providing pub/sub, presence, and stream processing for applications at scale. A platform for running applications close to users worldwide with lightweight VMs and global edge deployment.
Pricing Freemium (Free-$99/month) Pay_per_use (Pay-as-you-go from $0)
Key Features
  • Pub/sub messaging
  • Presence
  • Stream processing
  • Webhooks
  • MQTT support
  • Message queuing
  • History
  • Global edge network
  • Global edge deployment
  • Fly Machines
  • PostgreSQL
  • Redis
  • Private networking
  • Auto-scaling
  • Docker support
  • CLI tools
Pros
  • Enterprise-grade reliability
  • Global edge network
  • Protocol support
  • Good documentation
  • Global distribution
  • Good performance
  • Docker-native
  • Fair pricing
Cons
  • Can be expensive
  • Complex pricing
  • Smaller community
  • Learning curve
  • Complexity for simple apps
  • Documentation gaps
  • Debugging can be hard
  • Smaller community