Aurelia 2 vs Qwik: A Comprehensive Comparison

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In the world of frontend development, Aurelia 2 and Qwik represent two different generations of web frameworks. While Aurelia 2 offers a modern, convention-based approach with powerful data binding, Qwik introduces a revolutionary approach focused on resumability and fine-grained reactivity. Let’s explore their differences and use cases.

Core Concepts

Aurelia 2 and Qwik take fundamentally different approaches to building web applications:

Aurelia 2 employs a modern, convention-based approach with powerful data binding and dependency injection
Qwik introduces resumability and fine-grained reactivity with automatic lazy loading of JavaScript

Reactivity and State Management

Declare State

Aurelia 2

<h1>Hello ${name}</h1>

Qwik

import { component$, useSignal } from "@builder.io/qwik";

export const Name = component$(() => {
  const name = useSignal("John");

  return <h1>Hello {name.value}</h1>;
});

Update State

Aurelia 2

<h1>Hello ${name}</h1>

Qwik

import { component$, useTask$, useSignal } from "@builder.io/qwik";

export const Name = component$(() => {
  const name = useSignal("John");

  useTask$(() => {
    name.value = "Jane";
  });

  return <h1>Hello {name.value}</h1>;
});

Computed State

Aurelia 2

<div>${doubleCount}</div>

Qwik

import { component$, useSignal, useComputed$ } from "@builder.io/qwik";

export const DoubleCount = component$(() => {
  const count = useSignal(10);
  const doubleCount = useComputed$(() => count.value * 2);

  return <div>{doubleCount.value}</div>;
});

Templating

Minimal Template

Aurelia 2

<h1>Hello world</h1>

Qwik

export const HelloWorld = () => {
  return <div>Hello World</div>;
};

Styling

Aurelia 2

/* css-style.css */
.title {
  color: red;
}

Qwik

import { component$, useStyles$ } from "@builder.io/qwik";

export const App = component$(() => {
  useStyles$(`
    .title {
      color: red;
    }
  `);

  return (
    <>
      <h1 class="title">I am red</h1>
      <button style={{ "font-size": "10rem" }}>I am a button</button>
    </>
  );
});

Loop

Aurelia 2

<ul>
  <li repeat.for="color of colors">${color}</li>
</ul>

Qwik

import { component$ } from "@builder.io/qwik";

export const Colors = component$(() => {
  const colors = ["red", "green", "blue"];
  return (
    <ul>
      {colors.map((color) => (
        <li key={color}>{color}</li>
      ))}
    </ul>
  );
});

Event Click

Aurelia 2

<p>Counter: ${count}</p>
<button click.trigger="incrementCount">+1</button>

Qwik

import { component$, useSignal, $ } from "@builder.io/qwik";

export const Counter = component$(() => {
  const count = useSignal(0);

  const incrementCount = $(() => {
    count.value++;
  });

  return (
    <>
      <p>Counter: {count.value}</p>
      <button onClick$={incrementCount}>Increment</button>
    </>
  );
});

DOM Reference

Aurelia 2

<input ref="inputElement" />

Qwik

import { component$, useVisibleTask$, useSignal } from "@builder.io/qwik";

export const InputFocused = component$(() => {
  const inputElement = useSignal<HTMLInputElement>();

  useVisibleTask$(({ track }) => {
    const el = track(inputElement);
    el?.focus();
  });

  return <input type="text" ref={inputElement} />;
});

Conditional

Aurelia 2

<button click.trigger="nextLight()">Next light</button>
<p>Light is: ${light}</p>
<p switch.bind="light">
  You must
  <span case="red">STOP</span>
  <span case="orange">SLOW DOWN</span>
  <span case="green">GO</span>
</p>

Qwik

import { $, component$, useComputed$, useSignal } from "@builder.io/qwik";

export const TRAFFIC_LIGHTS = ["red", "orange", "green"];

export const TrafficLight = component$(() => {
  const lightIndex = useSignal(0);

  const light = useComputed$(() => TRAFFIC_LIGHTS[lightIndex.value]);

  const nextLight = $(() => {
    lightIndex.value = (lightIndex.value + 1) % TRAFFIC_LIGHTS.length;
  });

  return (
    <>
      <button onClick$={nextLight}>Next light</button>
      <p>Light is: {light.value}</p>
      <p>
        You must {light.value === "red" && <span>STOP</span>}
        {light.value === "orange" && <span>SLOW DOWN</span>}
        {light.value === "green" && <span>GO</span>}
      </p>
    </>
  );
});

Lifecycle

On Mount

Aurelia 2

<p>Page title is: ${pageTitle}</p>

Qwik

import { component$, useVisibleTask$, useStore } from "@builder.io/qwik";

export const App = component$(() => {
  const store = useStore({
    pageTitle: "",
  });

  useVisibleTask$(() => {
    store.pageTitle = document.title;
  });

  return <p>Page title: {store.pageTitle}</p>;
});

On Unmount

Aurelia 2

<p>Current time: ${time}</p>

Qwik

import { component$, useVisibleTask$, useStore } from "@builder.io/qwik";

export const App = component$(() => {
  const store = useStore({
    time: new Date().toLocaleTimeString(),
  });

  useVisibleTask$(({ cleanup }) => {
    const timer = setInterval(() => {
      store.time = new Date().toLocaleTimeString();
    }, 1000);

    cleanup(() => clearInterval(timer));
  });

  return <p>Current time: {store.time}</p>;
});

Component Composition

Props

Aurelia 2

<user-profile
  name.bind
  age.bind
  favourite-colors.bind="colors"
  is-available.bind="available"
></user-profile>

Qwik

import { component$ } from "@builder.io/qwik";
import UserProfile from "./UserProfile";

const App = component$(() => {
  return (
    <UserProfile
      name="John"
      age={20}
      favouriteColors={["green", "blue", "red"]}
      isAvailable
    />
  );
});

export default App;

Emit to Parent

Aurelia 2

<p>Can I come ?</p>
<answer-button action-handler.bind="handleAnswer"></answer-button>
<p style="font-size: 50px">${isHappy ? "😀" : "😥"}</p>

Qwik

import { $, component$, useStore } from "@builder.io/qwik";
import AnswerButton from "./AnswerButton";

const App = component$(() => {
  const store = useStore({
    isHappy: true,
  });

  const onAnswerNo = $(() => {
    store.isHappy = false;
  });

  const onAnswerYes = $(() => {
    store.isHappy = true;
  });

  return (
    <>
      <p>Are you happy?</p>
      <AnswerButton onYes$={onAnswerYes} onNo$={onAnswerNo} />
      <p style={{ fontSize: 50 }}>{store.isHappy ? "😀" : "😥"}</p>
    </>
  );
});

export default App;

Slot

Aurelia 2

<funny-button>Click me !</funny-button>

Qwik

import FunnyButton from "./FunnyButton";

export default function App() {
  return <FunnyButton>Click me!</FunnyButton>;
}

Slot Fallback

Aurelia 2

<funny-button></funny-button> <funny-button>Click me !</funny-button>

Qwik

import FunnyButton from "./FunnyButton";

export default function App() {
  return (
    <>
      <FunnyButton />
      <FunnyButton>Click me!</FunnyButton>
    </>
  );
}

Context

Aurelia 2

<h1>Welcome back, {{ user.username }}</h1>
<user-profile />

Qwik

import {
  component$,
  useStore,
  useContextProvider,
  createContext,
  $,
} from "@builder.io/qwik";
import UserProfile from "./UserProfile";

export const UserContext = createContext("user-context");

const App = component$(() => {
  const user = useStore({
    id: 1,
    username: "unicorn42",
    email: "unicorn42@example.com",
  });

  const updateUsername = $((newUsername) => {
    user.username = newUsername;
  });

  useContextProvider(UserContext, { user, updateUsername });

  return (
    <>
      <h1>Welcome back, {user.username}</h1>
      <UserProfile />
    </>
  );
});

export default App;

Form Input

Input Text

Aurelia 2

<p>${text}</p>
<input value.bind />

Qwik

import { component$, useSignal } from "@builder.io/qwik";

const InputHello = component$(() => {
  const text = useSignal("");

  return (
    <>
      <p>{text.value}</p>
      <input bind:value={text} />
    </>
  );
});

export default InputHello;

Checkbox

Aurelia 2

<input id="is-available" type="checkbox" checked.bind="isAvailable" />
<label for="is-available">Is available</label>: ${isAvailable}

Qwik

import { component$, useSignal } from "@builder.io/qwik";

const IsAvailable = component$(() => {
  const isAvailable = useSignal(false);

  return (
    <>
      <input id="is-available" type="checkbox" bind:checked={isAvailable} />
      <label for="is-available">Is available</label>
    </>
  );
});

export default IsAvailable;

Radio

Aurelia 2

<div>Picked: ${picked}</div>

<input id="blue-pill" checked.bind="picked" type="radio" value="blue" />
<label for="blue-pill">Blue pill</label>

<input id="red-pill" checked.bind="picked" type="radio" value="red" />
<label for="red-pill">Red pill</label>

Qwik

import { component$, useSignal } from "@builder.io/qwik";

const PickPill = component$(() => {
  const pickedColor = useSignal("red");

  return (
    <>
      <div>Picked: {pickedColor.value}</div>
      <input
        id="blue-pill"
        type="radio"
        bind:value={pickedColor}
        checked={pickedColor.value === "blue"}
        value="blue"
      />
      <label for="blue-pill">Blue pill</label>

      <input
        id="red-pill"
        type="radio"
        checked={pickedColor.value === "red"}
        bind:value={pickedColor}
        value="red"
      />
      <label for="red-pill">Red pill</label>
    </>
  );
});

export default PickPill;

Select

Aurelia 2

<select value.bind="selectedColorId">
  <option value="">Select A Color</option>
  <option
    repeat.for="color of colors"
    value.bind="color.id"
    disabled.bind="color.isDisabled"
  >
    ${color.text}
  </option>
</select>

Qwik

import { component$, useSignal } from "@builder.io/qwik";

export const colors = [
  { id: 1, text: "red" },
  { id: 2, text: "blue" },
  { id: 3, text: "green" },
  { id: 4, text: "gray", isDisabled: true },
];

const ColorSelect = component$(() => {
  const selectedColorId = useSignal("2");

  return (
    <select bind:value={selectedColorId}>
      {colors.map((color) => (
        <option
          key={color.id}
          value={color.id}
          disabled={color.isDisabled}
          selected={`${color.id}` === selectedColorId.value}
        >
          {color.text}
        </option>
      ))}
    </select>
  );
});

export default ColorSelect;

Web App Features

Render App

Aurelia 2

<!DOCTYPE html>
<html>
  <head>
    <script type="module" src="./main.ts"></script>
  </head>

  <body>
    <app></app>
  </body>
</html>

Qwik

<!DOCTYPE html>
<html>
  <body>
    <div id="app"></div>
    <script type="module" src="./main.tsx"></script>
  </body>
</html>

Fetch Data

Aurelia 2

<template promise.bind="useFetchUsers.fetchData()">
  <p pending>Fetching users...</p>
  <p catch>An error ocurred while fetching users</p>
  <ul then.from-view="users">
    <li repeat.for="user of users">
      <img src.bind="user.picture.thumbnail" alt="user" />
      <p>${ user.name.first } ${ user.name.last }</p>
    </li>
  </ul>
</template>

Qwik

import { component$, useResource$, Resource } from "@builder.io/qwik";

type UsersResponse = {
  results: {
    picture: {
      thumbnail: string;
    };
    name: {
      first: string;
      last: string;
    };
  }[];
};

export async function fetchUsers() {
  return (await fetch("https://randomuser.me/api/?results=3")).json();
}

export const App = component$(() => {
  const data = useResource$<UsersResponse>(fetchUsers);

  return (
    <Resource
      value={data}
      onPending={() => <p>Fetching users...</p>}
      onRejected={() => <p>An error occurred while fetching users</p>}
      onResolved={({ results: users }) => (
        <ul>
          {users.map((user) => (
            <li>
              <img src={user.picture.thumbnail} alt="user" />
              <p>
                {user.name.first} {user.name.last}
              </p>
            </li>
          ))}
        </ul>
      )}
    />
  );
});

Performance and Bundle Size

Aurelia 2

Modern, optimized architecture
Tree-shakeable modules
Efficient template compilation
Strong performance characteristics
Convention over configuration

Qwik

Zero hydration
Resumable applications
Fine-grained lazy loading
Optimal initial page load
Progressive JavaScript loading

Learning Curve

Aurelia 2

Convention-based approach
Object-oriented programming
Strong TypeScript support
Comprehensive documentation
Active community support

Qwik

New concepts (resumability, lazy loading)
JSX-like syntax familiar to React developers
Strong TypeScript support
Growing documentation and community
Innovative development patterns

Conclusion

Choose Aurelia 2 if you:

Prefer convention over configuration
Need powerful dependency injection
Want strong data binding capabilities
Value object-oriented programming
Are building medium to large applications

Choose Qwik if you:

Need optimal initial page load
Want zero hydration overhead
Need progressive JavaScript loading
Value modern development features
Are building large, scalable applications

Both frameworks excel in different scenarios:

Aurelia 2 shines in applications that benefit from conventions and strong architecture
Qwik excels in large applications that need optimal loading and modern features

The choice between Aurelia 2 and Qwik often depends on your specific needs:

Use Aurelia 2 for applications that need strong conventions and architecture
Use Qwik for applications that need optimal loading and modern development features

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Aurelia 2 vs Qwik: A Comprehensive Comparison

Table of Contents

Core Concepts

Reactivity and State Management

Declare State

Aurelia 2

Qwik

Update State

Aurelia 2

Qwik

Computed State

Aurelia 2

Qwik

Templating

Minimal Template

Aurelia 2

Qwik

Styling

Aurelia 2

Qwik

Loop

Aurelia 2

Qwik

Event Click

Aurelia 2

Qwik

DOM Reference

Aurelia 2

Qwik

Conditional

Aurelia 2

Qwik

Lifecycle

On Mount

Aurelia 2

Qwik

On Unmount

Aurelia 2

Qwik

Component Composition

Props

Aurelia 2

Qwik

Emit to Parent

Aurelia 2

Qwik

Slot

Aurelia 2

Qwik

Slot Fallback

Aurelia 2

Qwik

Context

Aurelia 2

Qwik

Form Input

Input Text

Aurelia 2

Qwik

Checkbox

Aurelia 2

Qwik

Radio

Aurelia 2

Qwik

Select

Aurelia 2

Qwik

Web App Features

Render App

Aurelia 2

Qwik

Fetch Data

Aurelia 2

Qwik

Performance and Bundle Size

Aurelia 2

Qwik

Learning Curve

Aurelia 2