Display all primary Flutter colours. Run it with Zapp: https://zapp.run/edit/flutter-zu0066yu106

colours.dart

import 'package:flutter/material.dart';
import 'package:flutter/services.dart';

void main() {
  runApp(MaterialApp(
    darkTheme: ThemeData.dark(),
    theme: ThemeData.light(),
    home: Scaffold(
      appBar: AppBar(title: const Text('Colors')),
      body: ListView.builder(
        itemCount: Colors.primaries.length,
        itemBuilder: (context, index) {
          final color = Colors.primaries[index];
          return ColoredBox(
            color: Colors.primaries[index],
            child: ListTile(
              title: Text(
                '${color}; ${color.value}',
              ),
              onTap: () {
                Clipboard.setData(ClipboardData(text: '${color.value}'));
                print('Copied value "${color.value}" to clipboard');
              },
            ),
          );
        },
      ),
    ),
    debugShowCheckedModeBanner: false,
  ));
}