Comparison with alternatives

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Comparison matrix

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LiveSvelte

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Key features

• Sigil DSL: Use ~V sigil to write Svelte code directly in LiveView templates
• Server-side rendering: Full SSR support with hydration
• Slot interoperability: Pass LiveView content to Svelte components
• Component macro: Auto-generate component functions from Svelte files
• Preprocessing support: Built-in support for TypeScript, SCSS, etc.

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Example usage

# Component approach
<.svelte name="Counter" props={%{count: @count}} socket={@socket} />

# Sigil DSL approach
def render(assigns) do
  ~V"""
  <script>
    export let count = 0
    let localState = 1
    $: combined = count + localState
  </script>

  <p>Server count: {count}</p>
  <p>Local state: {localState}</p>
  <p>Combined: {combined}</p>

  <button phx-click="increment">Server increment</button>
  <button on:click={() => localState++}>Local increment</button>
  """
end

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When to choose LiveSvelte

• You prefer Svelte’s syntax and reactivity model
• You want to use Svelte as an alternative LiveView DSL
• You need advanced preprocessing (TypeScript, SCSS, etc.)
• You want the most mature LiveView + frontend framework integration
• You’re building complex animations or transitions

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Considerations

• Custom build system (not standard esbuild)
• Larger learning curve if unfamiliar with Svelte
• “Secret state” caveat (client code visible to users)

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LiveReact

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Key features

• SSR support: Server-side rendering with hydration
• TypeScript support: Full TypeScript integration
• Vite integration: Modern build tooling
• Context provider: LiveReact context for accessing LiveView functions
• Inner block slots: Support for passing content to React components

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Example usage

<.react name="Counter" props={%{count: @count}} socket={@socket} />

// Counter.jsx
import { useLiveReact } from 'live_react'

export default function Counter({ count }) {
  const { pushEvent } = useLiveReact()

  return (
    <div>
      <p>Count: {count}</p>
      <button onClick={() => pushEvent('increment')}>
        Increment
      </button>
    </div>
  )
}

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When to choose LiveReact

• Your team has React expertise
• You want to reuse existing React components
• You need access to the vast React ecosystem
• You prefer JSX syntax
• You’re migrating from a React application

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Considerations

• Newer library (less mature than LiveSvelte)
• React’s larger bundle size
• More complex state management patterns in React

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LiveState

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Key features

• Framework agnostic: Works with any frontend framework or vanilla JS
• Embeddable apps: Designed for building widgets that embed in other sites
• Channel-based: Uses Phoenix Channels for real-time communication
• Event-driven: Client dispatches events, server manages state
• JSON patch updates: Efficient state synchronization

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Example usage

# Channel
defmodule MyApp.TodoChannel do
  use LiveState.Channel, web_module: MyAppWeb

  def init(_channel, _payload, _socket) do
    {:ok, %{todos: []}}
  end

  def handle_event("add_todo", todo, %{todos: todos}) do
    {:noreply, %{todos: [todo | todos]}}
  end
end

// Client (any framework)
import LiveState from 'phx-live-state'

const liveState = new LiveState({
  url: 'ws://localhost:4000/socket',
  topic: 'todos:lobby'
})

liveState.addEventListener('state_change', (state) => {
  // Update UI with new state
})

liveState.dispatchEvent('add_todo', { title: 'New todo' })

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When to choose LiveState

• You’re building embeddable widgets for third-party sites
• You want framework flexibility (React, Vue, Svelte, vanilla JS)
• You need real-time updates across multiple clients
• You’re building highly interactive components within existing apps
• You want minimal client-side complexity

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Considerations

• No SSR support
• More setup required for basic use cases
• Different mental model from traditional LiveView
• Best suited for specific use cases (embeddable apps)

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LiveVue

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Key features

• End-to-end reactivity: Automatic prop updates from LiveView
• Server-side rendering: Optional SSR with configurable settings
• Component shortcuts: Auto-generated component functions
• Slot support: Pass LiveView content to Vue components
• TypeScript support: Full TypeScript integration with Vite
• Event handling: Multiple approaches for handling events

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Example usage

<.vue
  v-component="Counter"
  v-socket={@socket}
  count={@count}
  v-on:increment={JS.push("inc")}
/>

<!-- Counter.vue -->
<template>
  <div>
    <p>Count: {{ count }}</p>
    <button @click="$emit('increment')">Increment</button>
  </div>
</template>

<script setup>
defineProps(['count'])
defineEmits(['increment'])
</script>

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When to choose LiveVue

• Your team has Vue.js expertise
• You want a balance between simplicity and power
• You prefer Vue’s template syntax and reactivity system
• You need good TypeScript support with modern tooling
• You want comprehensive documentation and examples

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Decision framework

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Choose LiveVue if:

• You’re experienced with Vue.js
• You want excellent documentation and examples
• You need a balance of features and simplicity
• You prefer Vue’s template syntax and composition API

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Choose LiveSvelte if:

• You love Svelte’s syntax and reactivity model
• You want to use frontend framework as LiveView DSL
• You need the most mature integration
• You’re building animation-heavy applications

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Choose LiveReact if:

• Your team is React-focused
• You want to reuse existing React components
• You need access to React’s ecosystem
• You’re migrating from a React application

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Choose LiveState if:

• You’re building embeddable widgets
• You need framework flexibility
• You want real-time updates across clients
• You’re building highly interactive components

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Stick with pure LiveView if:

• Your app doesn’t need complex client-side interactivity
• You want to minimize JavaScript complexity
• Your team is primarily backend-focused
• You’re building traditional web applications

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Migration considerations

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From LiveView to any integration

1. Identify components: Determine which parts need client-side interactivity
2. State boundaries: Decide what state lives on server vs client
3. Event patterns: Plan how events flow between client and server
4. Build process: Update your asset pipeline for the chosen framework

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Between integrations

1. Component structure: All use similar prop-passing patterns
2. Event handling: All support bidirectional event communication
3. SSR: Most support server-side rendering
4. Build tools: May require build system changes

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Performance considerations

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Bundle size

• LiveState: Smallest (framework-agnostic)
• LiveSvelte: Small (Svelte compiles to minimal code)
• LiveVue: Medium (Vue runtime)
• LiveReact: Largest (React + ReactDOM)

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Runtime performance

• Svelte: Fastest (compiled, no virtual DOM)
• Vue: Fast (optimized virtual DOM)
• React: Good (virtual DOM with optimizations)
• LiveState: Depends on chosen framework

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Server load

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Community and ecosystem

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LiveSvelte

• Maturity: Most mature integration
• Community: Active development and community
• Documentation: Comprehensive with examples

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LiveVue

• Maturity: Stable and well-documented
• Community: Growing community
• Documentation: Extensive guides and examples

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LiveReact

• Maturity: Recently reached v1.0
• Community: Active development
• Documentation: Good documentation

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LiveState

• Maturity: Stable for specific use cases
• Community: Focused on embeddable apps
• Documentation: Good for target use cases

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Conclusion

• LiveVue offers excellent Vue.js integration with comprehensive features
• LiveSvelte provides the most mature integration with unique DSL capabilities
• LiveReact brings React’s ecosystem to LiveView applications
• LiveState enables embeddable applications and framework flexibility

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Further reading

• LiveVue Documentation
• LiveSvelte Documentation
• LiveReact Documentation
• LiveState Documentation
• Phoenix LiveView Documentation