- add SEO and screenshot

- add Hourly Rate Calculator to sidebar.html and tools.json

Author: TobiasMue91

data/tools.json

@@ -1681,5 +1681,16 @@
     "aiPowered": false,
     "featured": false,
     "date": "2025-08-31"
+  },
+  {
+    "id": "hourly_rate_calculator",
+    "title": "Hourly Rate Calculator",
+    "description": "Professional hourly rate calculator with client management, tax calculation, and billing history. Calculate your billable hours instantly with this free online tool featuring client tracking and invoice export.",
+    "url": "tools/hourly_rate_calculator.html",
+    "screenshot": "screenshots/screenshot_219.webp",
+    "type": "tool",
+    "aiPowered": false,
+    "featured": false,
+    "date": "2025-09-29"
   }
 ]

screenshots/screenshot_219.webp

@@ -304,6 +304,7 @@ <h2>Tools by ChatGPT</h2>
       <li><a href="/games/stack_tower.html">Stack Tower</a></li>
       <li><a href="/tools/css_unit_converter.html">CSS Unit Converter</a></li>
       <li><a href="/tools/html_tag_stripper.html">HTML Tag Stripper</a></li>
+      <li><a href="/tools/hourly_rate_calculator.html">Hourly Rate Calculator</a></li>
 <!-- end -->
     </ul>
   </div>

sidebar.html

@@ -4,6 +4,24 @@
     <meta charset="UTF-8">
     <meta name="viewport" content="width=device-width,initial-scale=1.0">
     <title>Hourly Rate Calculator - Professional Billing Tool</title>
+    <meta name="description" content="Professional hourly rate calculator with client management, tax calculation, and billing history. Calculate your billable hours instantly with this free online tool featuring client tracking and invoice export.">
+    <meta name="keywords" content="hourly rate calculator, billing calculator, freelance calculator, hourly wage calculator, time billing, invoice calculator, client billing, freelance tools, contractor calculator, hourly billing">
+    <meta name="author" content="Claude Sonnet 4.5 prompted by Tobias Müller">
+    <meta name="robots" content="index, follow">
+    <meta name="language" content="English">
+    <meta property="og:title" content="Hourly Rate Calculator - Professional Billing Tool">
+    <meta property="og:description" content="Calculate your billing amount by entering hours worked and hourly rate, with optional client tracking for quick invoicing. Free online tool with dark mode support.">
+    <meta property="og:url" content="https://www.gptgames.dev/tools/hourly_rate_calculator.html">
+    <meta property="og:type" content="website">
+    <meta property="og:image" content="https://www.gptgames.dev/screenshots/screenshot_219.webp">
+    <meta property="og:image:width" content="1200">
+    <meta property="og:image:height" content="630">
+    <meta property="og:site_name" content="GPT Games">
+    <meta name="twitter:card" content="summary_large_image">
+    <meta name="twitter:title" content="Hourly Rate Calculator - Professional Billing Tool">
+    <meta name="twitter:description" content="Calculate your billing amount by entering hours worked and hourly rate, with optional client tracking for quick invoicing.">
+    <meta name="twitter:image" content="https://www.gptgames.dev/screenshots/screenshot_219.webp">
+    <link rel="canonical" href="https://www.gptgames.dev/tools/hourly_rate_calculator.html">
     <style>
         *{margin:0;padding:0;box-sizing:border-box}
         :root{