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Ably vs MongoDB Atlas: 2026 Comparison

Ably MongoDB Atlas
Overview A realtime messaging infrastructure platform providing pub/sub, presence, and stream processing for applications at scale. A fully managed cloud database service for MongoDB with auto-scaling, global distribution, and built-in security.
Pricing Freemium (Free-$99/month) Freemium (Free-pay-as-you-go)
Key Features
  • Pub/sub messaging
  • Presence
  • Stream processing
  • Webhooks
  • MQTT support
  • Message queuing
  • History
  • Global edge network
  • Managed MongoDB
  • Auto-scaling
  • Global clusters
  • Atlas Search
  • Charts
  • Realm sync
  • Data API
  • Serverless instances
Pros
  • Enterprise-grade reliability
  • Global edge network
  • Protocol support
  • Good documentation
  • Leading NoSQL database
  • Global distribution
  • Atlas Search built-in
  • Free tier
Cons
  • Can be expensive
  • Complex pricing
  • Smaller community
  • Learning curve
  • Can get expensive
  • NoSQL learning curve
  • Vendor lock-in
  • Complex pricing