Comparison

Every tool in this space makes different tradeoffs. Here’s an honest look at when you’d pick each one — and when you wouldn’t.

Socket.io

The battle-tested standard for realtime in Node.js.

Strengths:

• Massive ecosystem and community — tons of tutorials, plugins, and production battle scars
• Automatic fallback to HTTP long-polling when WebSockets aren’t available
• Room and namespace abstractions built-in
• Works with any language (has clients for Python, Java, Go, etc.)

Tradeoffs:

• Type safety is opt-in and manual — you define shared interfaces that can drift from the implementation
• No runtime validation — payloads are untyped any by default
• No built-in state management — you manage server state and sync it yourself
• Event-string API (socket.emit("event", ...)) is error-prone at scale

Best for: Teams that need broad runtime/language support, HTTP fallbacks, or are already invested in the Socket.io ecosystem.

PartyKit (Cloudflare)

Edge-first realtime platform built on Cloudflare Workers and Durable Objects.

Strengths:

• Runs at the edge — low latency globally without managing infrastructure
• Each “party” is an isolated stateful server (similar concept to actors)
• Hibernation support — parties sleep when idle, saving costs
• Managed platform — no servers to operate, scales automatically
• Good integration with Cloudflare’s ecosystem (KV, D1, R2)

Tradeoffs:

• Platform lock-in to Cloudflare — you can’t self-host or run on other clouds
• Limited TypeScript inference across the wire — client types are manual
• No automatic state sync — you send messages and manage client state yourself
• Durable Object constraints (single-region per party, storage limits)
• Cloudflare Workers runtime limitations (no Node.js APIs, execution time limits)

Best for: Teams that want managed infrastructure at the edge and are comfortable with Cloudflare lock-in. Great for apps where latency matters more than type safety DX.

Convex

Reactive backend-as-a-service with a built-in database.

Strengths:

• Full reactive backend — queries automatically re-run and push updates when underlying data changes
• Built-in database with ACID transactions — no external DB to manage
• Excellent TypeScript support — functions are typed end-to-end
• Scheduled functions, cron jobs, file storage, and auth built-in
• Handles caching, pagination, and optimistic updates out of the box

Tradeoffs:

• Fully managed platform — you can’t self-host or bring your own database
• The reactive model is query-based, not actor-based — great for CRUD-like updates, less natural for game loops or stateful simulations
• Vendor lock-in — your data and logic live on Convex’s infrastructure
• Pricing scales with function calls and database usage
• Not designed for raw WebSocket use cases like streaming binary data

Best for: Apps that are primarily data-driven (dashboards, collaborative docs, social feeds) where you want a complete reactive backend without managing infrastructure. Excellent choice if you don’t need fine-grained control over the realtime protocol.

Liveblocks

Collaborative infrastructure for building multiplayer experiences.

Strengths:

• Purpose-built for collaboration — presence, cursors, selection, comments, notifications out of the box
• Conflict-free storage via Yjs/CRDT integration — true multi-writer without conflicts
• Excellent React bindings with suspense support
• Managed infrastructure — no backend to build for collaboration features
• Rich pre-built components (comments, threads, notifications)

Tradeoffs:

• Collaboration-focused — not a general-purpose realtime framework
• Managed service with per-MAU pricing — costs scale with users, not usage
• Limited server-side logic — the server is Liveblocks’ infrastructure, not yours
• You can’t define custom server-side methods or business logic in Liveblocks itself
• Storage model is CRDT-based — powerful for collaboration, but overkill for simple state sync

Best for: Teams building collaborative features (multiplayer cursors, shared editing, comments) who want polished, ready-made components. If your app is primarily about collaboration UX, Liveblocks gets you there faster than building from scratch.

Supabase Realtime

Realtime layer on top of Postgres.

Strengths:

• Database-driven — changes to Postgres rows automatically broadcast to clients
• Presence and broadcast channels built-in
• Integrates with the full Supabase stack (auth, storage, edge functions)
• Row-level security applies to realtime subscriptions
• Open source — self-hostable

Tradeoffs:

• Tied to Postgres — realtime events are driven by database changes, not arbitrary server logic
• No actor model or stateful server-side units
• Limited control over message routing — it’s pub/sub over database changes
• Not ideal for high-frequency updates (game state, cursor positions) due to database overhead
• TypeScript support exists but isn’t as deeply inferred as purpose-built frameworks

Best for: Apps already on Supabase that need realtime updates when database records change. Great for live feeds, notifications, and dashboards backed by Postgres.

Ably / Pusher

Managed pub/sub messaging platforms.

Strengths:

• Global edge infrastructure — low latency, high availability, no servers to manage
• Protocol-level features: message ordering, delivery guarantees, history, presence
• Broad SDK support — works with any language, any platform
• Handles reconnection, deduplication, and exactly-once delivery

Tradeoffs:

• Pure message transport — no server-side logic, state management, or actors
• You build the application layer yourself on top of pub/sub primitives
• Per-message pricing can get expensive at scale
• No type safety across the wire — messages are untyped payloads
• Not open source (Ably has an open protocol, but the platform is managed)

Best for: Apps that need reliable, global message delivery without building infrastructure — notifications, live scores, IoT telemetry. Less suited for stateful multiplayer where you need server-side logic.

Quick Comparison

	Zocket	Socket.io	PartyKit	Convex	Liveblocks	Supabase Realtime
Type safety	✅ Fully inferred	⚠️ Manual	⚠️ Manual	✅ End-to-end	✅ SDK-typed	⚠️ Generated
State sync	✅ Auto (JSON patches)	❌ DIY	❌ DIY	✅ Auto (reactive queries)	✅ Auto (CRDTs)	✅ Auto (DB rows)
Server logic	✅ Actor methods	⚠️ Event handlers	✅ Party class	✅ Server functions	❌ Managed only	⚠️ Edge functions
Concurrency	✅ Sequential per actor	❌ DIY	✅ Single-threaded per party	✅ Serialized transactions	✅ CRDT merge	✅ DB transactions
Self-hostable	✅ Yes	✅ Yes	❌ Cloudflare only	❌ No	❌ No	✅ Yes
React bindings	✅ Built-in	⚠️ Community	⚠️ Community	✅ Built-in	✅ Built-in	✅ Built-in

When to use something else

• You need HTTP fallbacks or broad language support — use Socket.io
• You want zero infrastructure and edge deployment — use PartyKit
• Your app is data/CRUD-driven and you want a full reactive backend — use Convex
• You’re building collaborative editing with cursors, comments, and presence — use Liveblocks
• You need realtime updates from Postgres changes — use Supabase Realtime
• You need global pub/sub with delivery guarantees — use Ably or Pusher
• Your app is purely request/response — use tRPC