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Head-to-head · WebSocket Tools

Socket.IO vs Fastly Fanout

  • Updated Oct 2026
  • Both researched from official sources
  • 3 checks side by side
Higher score Socket.IO #1 in WebSocket Tools 9.3/10 Free plan Free plan✓ 2 of 2 features Visit Socket.IO
Fastly Fanout #4 in WebSocket Tools 8.6/10 Pricing on request · 30-day trial ✓ 1 of 2 features Visit Fastly

Socket.IO leads on 2 checks, Fastly Fanout on 0, and 1 is even. Who comes out ahead on the 3 yes/no, price and count checks where we have data for both products. The editor score weighs everything else too.

Our verdict

  • Highest scoreSocket.IO · 9.3/10
  • Free planonly Socket.IO
  • Most featuresSocket.IO · 2 of 2

Socket.IO scores higher on our rubric for websocket tools: 9.3 against 8.6 out of 10; our editors rank them #1 and #4.

Socket.IO offers free plan; Fastly Fanout doesn't. On deployment model, Socket.IO gives you Library where Fastly Fanout offers Managed. Socket.IO offers self-hosting available; Fastly Fanout doesn't.

Socket.IO is the better fit for teams building flexible real-time apps. Fastly Fanout is the better fit for enterprises building real-time streaming applications.

  • Socket.IO fits best

    Teams building flexible real-time apps

  • Fastly Fanout fits best

    Enterprises building real-time streaming applications

Advertiser disclosure: iTechGuides is reader-supported. We may earn a commission when you click some links. How we rank.

Side by side

Feature Socket.IO 9.3/10 Visit ↗ Fastly Fanout 8.6/10 Visit ↗
At a glance
Editor score 9.3 8.6
Ranking #1 in WebSocket Tools #4 in WebSocket Tools
Best for Teams building flexible real-time apps Enterprises building real-time streaming applications
Pricing model Free Paid
Starting price Not published Not published
Free plan ✓ (best) —
Free trial — —
Deployment Self-hosted Cloud
Platforms Web Web
Built for Solo, Small business, Mid-market, Enterprise Mid-market, Enterprise
Features Socket.IO 2/2 · Fastly Fanout 1/2
Pub/sub messaging ✓ ✓
Self-hosting available ✓ (best) —
Specs
Deployment model Library Managed
Free concurrent connections Not published Not published
Client SDKs JavaScript (browser, Node.js, React Native); Java; C++; Swift; Dart; Python; .NET; Rust; Kotlin; PHP; Go; JavaScript (WeChat Mini-Programs) Rust, JavaScript, Go
Protocol support HTTP long-polling; WebSocket; WebTransport WebSockets, Server-Sent Events, HTTP long polling, MQTT
Our review
Pros
  • Selects among HTTP long-polling, WebSocket, and WebTransport, with fallback
  • Handles reconnection, packet buffering, and event acknowledgements
  • Supports rooms, namespaces, and broadcasts across multiple server nodes
  • Manages persistent WebSocket connections at the edge
  • Supports pub/sub, SSE, long polling, and MQTT architectures
  • Translates client streams to HTTP backends, including serverless backends
Cons
  • A library to self-host, not a hosted connection service
  • Requires implementation and operations work from the adopting team
  • Several non-JavaScript clients are separate projects
  • Requires a paid Fastly account with a Compute service for the trial
  • Pricing is handled through Fastly sales
  • Fanout is a managed cloud service, not a self-hosted deployment
Our verdict

Socket.IO is an open-source library for bidirectional, event-based communication between clients and servers. It suits teams building web and other applications that need real-time updates and want control over the connection layer, rather…

Read the review →

Fastly Fanout is a managed edge publish/subscribe service for applications that need to keep client connections open and deliver live updates. It is aimed at teams building chat, live feeds, notifications, and IoT messaging, particularly…

Read the review →
  1. Socket.IOWebSocket Tools 9.3Free plan
  2. Fastly FanoutWebSocket Tools 8.6Pricing on request · 30-day trial

Strengths and trade-offs

  • Socket.IO — where it wins

    • Selects among HTTP long-polling, WebSocket, and WebTransport, with fallback
    • Handles reconnection, packet buffering, and event acknowledgements
    • Supports rooms, namespaces, and broadcasts across multiple server nodes

    Where it doesn't

    • A library to self-host, not a hosted connection service
    • Requires implementation and operations work from the adopting team
    • Several non-JavaScript clients are separate projects

  • Fastly Fanout — where it wins

    • Manages persistent WebSocket connections at the edge
    • Supports pub/sub, SSE, long polling, and MQTT architectures
    • Translates client streams to HTTP backends, including serverless backends

    Where it doesn't

    • Requires a paid Fastly account with a Compute service for the trial
    • Pricing is handled through Fastly sales
    • Fanout is a managed cloud service, not a self-hosted deployment
  • Socket.IO9.3/10 · Free plan

    An open-source library for real-time apps, with transport fallback and reconnection built in.

    Visit Socket.IOFull verdict →
  • Fastly Fanout8.6/10 · Pricing on request · 30-day trial

    A managed edge service for persistent connections and live message delivery.

    Visit FastlyFull verdict →

More comparisons

All WebSocket tools comparisons → · Full ranking →

Guides on WebSocket tools

Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Last updated · How we research and update