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Ably vs Datadog RUM: 2026 Comparison

Ably Datadog RUM
Overview A realtime messaging infrastructure platform providing pub/sub, presence, and stream processing for applications at scale. Datadog Real User Monitoring captures end-user performance data and errors from browser and mobile applications. It integrates with Datadog's infrastructure monitoring for full-stack observability.
Pricing Freemium (Free-$99/month) Paid ($15/1000 sessions/mo)
Key Features
  • Pub/sub messaging
  • Presence
  • Stream processing
  • Webhooks
  • MQTT support
  • Message queuing
  • History
  • Global edge network
  • Real user monitoring
  • error tracking
  • session replay
  • core web vitals
  • resource tracking
  • long task detection
  • frustration signals
  • full-stack correlation
Pros
  • Enterprise-grade reliability
  • Global edge network
  • Protocol support
  • Good documentation
  • Excellent infrastructure integration
  • Full-stack visibility
  • Strong error tracking
  • Good performance metrics
Cons
  • Can be expensive
  • Complex pricing
  • Smaller community
  • Learning curve
  • Expensive at scale
  • Requires Datadog ecosystem
  • Complex pricing model
  • Steep learning curve