Browser app creator

Skill jackspace/ClaudeSkillz/skills/browser-app-creator

ClaudeSkillz: For when you need skills, but lazier

Install

npx -y skills add jackspace/ClaudeSkillz --skill browser-app-creator

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15 stars15 stars. Stars are a popularity signal and not a quality one, but at this level it is likely that nobody has read this closely except its author, and you would be relying on your own review.

What its author says it does

Copied from the file, not written here

Creates complete single-file HTML/CSS/JS web apps with localStorage persistence, ADHD-optimized UI (60px+ buttons), dark mode, and offline functionality. Use when user says "create app", "build tool", "make dashboard", or requests any browser-based interface.

SKILL.md

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Browser App Creator

Purpose

Creates production-ready single-file web applications that work offline with zero setup. Perfect for quick tools, dashboards, trackers, and prototypes.

For ADHD users: Large buttons (60px+), auto-save everything, visual feedback, zero configuration. For SDAM users: All data persists in localStorage with timestamps. For all users: Download and use immediately - no server, no build step, no dependencies.

Activation Triggers

User says: "create app", "build tool", "make dashboard", "create tracker"
Requests for: habit tracker, todo list, timer, calculator, form, visualization
Any request for a browser-based interface or tool

Core Workflow

1. Understand Requirements

Ask clarifying questions only if absolutely necessary:

{
  app_type: "dashboard|tracker|form|tool|visualization",
  primary_function: "What does the app do?",
  data_to_track: ["What data needs to be stored?"],
  key_actions: ["What can users do?"],
  visual_requirements: "Any specific layout needs?"
}

2. Generate Single-File App

Template structure:

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>{App Name}</title>
  <style>
    /* ADHD-Optimized Styles */
  </style>
</head>
<body>
  <!-- App UI -->
  <script>
    // App Logic + localStorage
  </script>
</body>
</html>

3. ADHD Optimization Requirements

Required UI elements:

✅ Buttons: Minimum 60px height, high contrast
✅ Dark mode: Default theme (can toggle)
✅ Auto-save: Every action saves to localStorage
✅ Visual feedback: Success/error messages
✅ Mobile responsive: Works on all screen sizes
✅ Large touch targets: 44px minimum for mobile

CSS Requirements:

/* ADHD-Optimized Base Styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: #1a1a1a;
  color: #e0e0e0;
  padding: 20px;
  max-width: 1200px;
  margin: 0 auto;
}

button {
  min-height: 60px;
  padding: 15px 30px;
  font-size: 18px;
  font-weight: 600;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s ease;
  background: #4a9eff;
  color: white;
}

button:hover {
  background: #357abd;
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(74, 158, 255, 0.4);
}

button:active {
  transform: translateY(0);
}

input, textarea, select {
  min-height: 50px;
  padding: 12px 15px;
  font-size: 16px;
  border: 2px solid #333;
  border-radius: 6px;
  background: #2a2a2a;
  color: #e0e0e0;
  width: 100%;
}

input:focus, textarea:focus, select:focus {
  outline: none;
  border-color: #4a9eff;
  box-shadow: 0 0 0 3px rgba(74, 158, 255, 0.2);
}

4. localStorage Pattern

Always include:

// localStorage Manager
const Storage = {
  key: 'app-name-data',

  save(data) {
    try {
      localStorage.setItem(this.key, JSON.stringify({
        ...data,
        lastUpdated: new Date().toISOString()
      }));
      this.showFeedback('✅ Saved!');
    } catch (error) {
      this.showFeedback('❌ Save failed', true);
      console.error('Save error:', error);
    }
  },

  load() {
    try {
      const data = localStorage.getItem(this.key);
      return data ? JSON.parse(data) : this.getDefaults();
    } catch (error) {
      console.error('Load error:', error);
      return this.getDefaults();
    }
  },

  getDefaults() {
    return {
      items: [],
      settings: {},
      created: new Date().toISOString()
    };
  },

  showFeedback(message, isError = false) {
    const feedback = document.createElement('div');
    feedback.textContent = message;
    feedback.style.cssText = `
      position: fixed;
      top: 20px;
      right: 20px;
      padding: 15px 25px;
      background: ${isError ? '#ff4444' : '#44ff88'};
      color: #000;
      border-radius: 8px;
      font-weight: 600;
      box-shadow: 0 4px 12px rgba(0,0,0,0.3);
      z-index: 1000;
      animation: slideIn 0.3s ease;
    `;
    document.body.appendChild(feedback);
    setTimeout(() => feedback.remove(), 2000);
  }
};

// Auto-save on any change
function autoSave(data) {
  Storage.save(data);
}

// Load on page load
let appData = Storage.load();

5. App Templates

See templates.md for complete examples of:

Dashboard: Metrics, charts, status indicators
Tracker: Habits, tasks, progress
Form: Data entry, validation, submission
Tool: Calculators, converters, utilities
Visualization: Charts, graphs, timelines

6. Deliver the App

Format:

✅ **{App Name}** complete!

**Features**:
- {Feature 1}
- {Feature 2}
- {Feature 3}

**Usage**:
1. Save the file as `{app-name}.html`
2. Open in any browser
3. Works offline
4. Data auto-saves to your browser

**Customization**:
- Colors: Edit the CSS variables at the top
- Features: Modify the JavaScript section
- Layout: Adjust the HTML structure

Then provide the complete HTML file.

Common App Types

Dashboard

Purpose: Display metrics, status, and key information Elements: Cards, charts, progress bars, status indicators Data: Real-time or static metrics Example: Project status dashboard, analytics viewer

Tracker

Purpose: Record and monitor recurring items Elements: Add/remove items, checkboxes, timestamps Data: List of items with status and dates Example: Habit tracker, task list, mood journal

Form/Input

Purpose: Collect and validate user input Elements: Input fields, validation, submit button Data: Form submissions with timestamps Example: Survey, calculator, data entry tool

Visualization

Purpose: Display data visually Elements: Charts, graphs, timelines Data: Visual representation of datasets Example: Chart builder, timeline viewer, graph tool

Interactive Tool

Purpose: Perform specific tasks or calculations Elements: Controls, real-time updates, results Data: Temporary or persistent tool state Example: Timer, converter, game, simulator

Advanced Features

Dark/Light Mode Toggle

function toggleTheme() {
  const currentTheme = document.body.dataset.theme || 'dark';
  const newTheme = currentTheme === 'dark' ? 'light' : 'dark';
  document.body.dataset.theme = newTheme;
  localStorage.setItem('theme-preference', newTheme);
}

// Load saved theme
document.body.dataset.theme = localStorage.getItem('theme-preference') || 'dark';

Export Data

function exportData() {
  const data = Storage.load();
  const blob = new Blob([JSON.stringify(data, null, 2)], { type: 'application/json' });
  const url = URL.createObjectURL(blob);
  const a = document.createElement('a');
  a.href = url;
  a.download = `app-data-${Date.now()}.json`;
  a.click();
  URL.revokeObjectURL(url);
}

Import Data

function importData() {
  const input = document.createElement('input');
  input.type = 'file';
  input.accept = 'application/json';
  input.onchange = (e) => {
    const file = e.target.files[0];
    const reader = new FileReader();
    reader.onload = (event) => {
      try {
        const data = JSON.parse(event.target.result);
        Storage.save(data);
        location.reload();
      } catch (error) {
        alert('Invalid file format');
      }
    };
    reader.readAsText(file);
  };
  input.click();
}

Browser Notifications

async function notifyUser(title, body) {
  if ('Notification' in window && Notification.permission === 'granted') {
    new Notification(title, { body });
  } else if (Notification.permission !== 'denied') {
    const permission = await Notification.requestPermission();
    if (permission === 'granted') {
      new Notification(title, { body });
    }
  }
}

Styling Guidelines

See styling.md for:

Complete CSS framework
Color schemes
Responsive breakpoints
Animation patterns
Accessibility guidelines

Integration with Other Skills

Rapid Prototyper

If app needs backend:

browser-app-creator → Creates frontend
rapid-prototyper → Creates backend API
Result: Full-stack app

Context Manager

Save app decisions:

remember: Created habit tracker with localStorage
Type: PROCEDURE
Tags: browser-app, localStorage, tracking

Error Debugger

If app has bugs:

Automatically invokes error-debugger for:
- JavaScript errors
- localStorage issues
- Browser compatibility

Quality Checklist

Before delivering, verify:

✅ Single file (HTML + CSS + JS)
✅ Works offline (no external dependencies)
✅ Buttons ≥60px height
✅ Dark mode default
✅ localStorage auto-save
✅ Visual feedback on actions
✅ Mobile responsive
✅ No console errors
✅ Data persists on reload

Example Output

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Habit Tracker</title>
  <style>
    /* Complete styles here */
  </style>
</head>
<body>
  <h1>Habit Tracker</h1>
  <div id="app">
    <!-- App UI here -->
  </div>
  <script>
    // Complete logic here
  </script>
</body>
</html>

Success Criteria

✅ App works immediately after opening ✅ Data persists across browser sessions ✅ ADHD-optimized (large buttons, auto-save) ✅ No setup or installation required ✅ Mobile-friendly ✅ Professional appearance ✅ Intuitive to use ✅ Handles errors gracefully

Additional Resources

App Templates - Complete working examples
Styling Guide - CSS patterns and color schemes

Quick Reference

Trigger Phrases

"create app"
"build tool"
"make dashboard"
"create tracker"
"build calculator"
"make timer"

File Location

All created apps should be saved to:

Linux/macOS: ~/.claude-artifacts/
Windows: %USERPROFILE%\.claude-artifacts\

Common Patterns

App Type	Key Feature	localStorage Structure
Tracker	List + checkboxes	`{ items: [...], dates: {...} }`
Dashboard	Cards + metrics	`{ metrics: {...}, updated: "" }`
Form	Input + validation	`{ submissions: [...] }`
Tool	Controls + results	`{ settings: {...}, history: [...] }`