devtools/index.html at main · vesper-astrena/devtools · GitHub

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<title>Developer Tools by Vesper Finch — Python CLI Tools for Data, JSON, Markets, and AI</title>
<meta name="description" content="Open-source Python CLI tools for cleaning CSV data, working with JSON, testing LLM prompts, and scanning prediction markets. Free to use, Pro editions available.">
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  "description":"Open-source Python CLI tools for data cleaning, LLM prompt testing, and prediction market analysis.",
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<header>
  <div class="container">
    <a href="index.html" class="logo">Vesper<span>Finch</span></a>
    <nav>
      <a href="csv-cleaner.html">CSV Cleaner</a>
      <a href="jsonkit.html">JSONKit</a>
      <a href="promptlab.html">PromptLab</a>
      <a href="polymarket-scanner.html">Polymarket Scanner</a>
    </nav>
  </div>
</header>

<section class="hero">
  <div class="container">
    <h1>Python CLI Tools That<br>Solve Real Problems</h1>
    <p class="subtitle">Four focused tools for data wrangling, JSON processing, prompt engineering, and market intelligence. Open source. Install in seconds. Pro editions for power users.</p>
    <div class="btn-group">
      <a href="https://github.com/vesper-astrena" class="btn btn-outline">View on GitHub</a>
      <a href="https://vesperfinch.gumroad.com" class="btn btn-primary">Get Pro Editions</a>
    </div>
  </div>
</section>

<section>
  <div class="container">
    <div class="section-header">
      <h2>The Toolkit</h2>
      <p>Each tool does one thing well. No bloat, no dependencies you don't need.</p>
    </div>

    <div class="cards">

      <!-- CSV Cleaner -->
      <div class="card">
        <span class="badge">Data</span>
        <h3>CSV Cleaner</h3>
        <p>Fix messy CSV files in one command. Handles encoding issues, duplicate rows, inconsistent delimiters, and malformed fields automatically.</p>
        <div class="code-block">
          <span class="prompt">$</span> <span class="cmd">csv-cleaner fix data.csv</span><br>
          <span class="out">Cleaned 1,247 rows &middot; Fixed 83 issues</span>
        </div>
        <div class="btn-group" style="justify-content:flex-start">
          <a href="csv-cleaner.html" class="btn btn-primary" style="padding:.5rem 1.2rem;font-size:.85rem">Learn more</a>
          <a href="https://github.com/vesper-astrena/csv-cleaner" class="btn btn-outline" style="padding:.5rem 1.2rem;font-size:.85rem">GitHub (Free)</a>
          <a href="https://vesperfinch.gumroad.com/l/zgnbf" class="btn btn-green" style="padding:.5rem 1.2rem;font-size:.85rem">Pro $19</a>
        </div>
      </div>

      <!-- JSONKit -->
      <div class="card">
        <span class="badge">JSON</span>
        <h3>JSONKit</h3>
        <p>Swiss Army knife for JSON. Format, validate, query, diff, flatten, and convert — all from one command. Works with pipes and stdin.</p>
        <div class="code-block">
          <span class="prompt">$</span> <span class="cmd">python jsonkit.py diff old.json new.json</span><br>
          <span class="out">~ $.email: changed &middot; + $.role &middot; 2 differences</span>
        </div>
        <div class="btn-group" style="justify-content:flex-start">
          <a href="jsonkit.html" class="btn btn-primary" style="padding:.5rem 1.2rem;font-size:.85rem">Learn more</a>
          <a href="https://github.com/vesper-astrena/jsonkit" class="btn btn-outline" style="padding:.5rem 1.2rem;font-size:.85rem">GitHub (Free)</a>
          <a href="https://vesperfinch.gumroad.com/l/jsonkit" class="btn btn-green" style="padding:.5rem 1.2rem;font-size:.85rem">Pro $19</a>
        </div>
      </div>

      <!-- PromptLab -->
      <div class="card">
        <span class="badge">AI / LLM</span>
        <h3>PromptLab</h3>
        <p>Test, compare, and version your LLM prompts from the terminal. Run A/B tests across models, track costs, and ship prompts with confidence.</p>
        <div class="code-block">
          <span class="prompt">$</span> <span class="cmd">promptlab test prompts/ --models gpt-4o,claude</span><br>
          <span class="out">Ran 24 tests &middot; 3 regressions found</span>
        </div>
        <div class="btn-group" style="justify-content:flex-start">
          <a href="promptlab.html" class="btn btn-primary" style="padding:.5rem 1.2rem;font-size:.85rem">Learn more</a>
          <a href="https://github.com/vesper-astrena/promptlab" class="btn btn-outline" style="padding:.5rem 1.2rem;font-size:.85rem">GitHub (Free)</a>
          <a href="https://vesperfinch.gumroad.com/l/qopfk" class="btn btn-green" style="padding:.5rem 1.2rem;font-size:.85rem">Pro $24</a>
        </div>
      </div>

      <!-- Polymarket Scanner -->
      <div class="card">
        <span class="badge">Markets</span>
        <h3>Polymarket Scanner</h3>
        <p>Find mispricings on Polymarket and other prediction markets. Surfaces arbitrage opportunities, tracks odds movement, and exports alerts.</p>
        <div class="code-block">
          <span class="prompt">$</span> <span class="cmd">polymarket-scanner scan --min-edge 5%</span><br>
          <span class="out">Found 7 opportunities &middot; Best edge: 12.3%</span>
        </div>
        <div class="btn-group" style="justify-content:flex-start">
          <a href="polymarket-scanner.html" class="btn btn-primary" style="padding:.5rem 1.2rem;font-size:.85rem">Learn more</a>
          <a href="https://github.com/vesper-astrena/polymarket-scanner" class="btn btn-outline" style="padding:.5rem 1.2rem;font-size:.85rem">GitHub (Free)</a>
          <a href="https://vesperfinch.gumroad.com/l/kxbax" class="btn btn-green" style="padding:.5rem 1.2rem;font-size:.85rem">Pro $29</a>
        </div>
      </div>

    </div>
  </div>
</section>

<section>
  <div class="container">
    <div class="section-header">
      <h2>Why These Tools?</h2>
    </div>
    <div class="features">
      <div class="feature">
        <h4>Zero Config</h4>
        <p>pip install and run. No YAML files, no setup wizards. Sensible defaults that work out of the box.</p>
      </div>
      <div class="feature">
        <h4>Single-Purpose</h4>
        <p>Each tool solves one problem well. No feature creep, no "platform" tax. Compose them with your existing workflow.</p>
      </div>
      <div class="feature">
        <h4>Open Source Core</h4>
        <p>The free version is genuinely useful. Pro editions add power-user features, not paywalled basics.</p>
      </div>
      <div class="feature">
        <h4>CLI-First</h4>
        <p>Built for the terminal. Pipe data in, get results out. Works in scripts, CI/CD, and notebooks.</p>
      </div>
    </div>
  </div>
</section>

<section>
  <div class="container">
    <div class="cta-banner">
      <h2>Start building with better tools</h2>
      <p>All three tools are free and open source. Pro editions are a one-time purchase.</p>
      <div class="btn-group">
        <a href="https://github.com/vesper-astrena" class="btn btn-primary">Browse on GitHub</a>
        <a href="https://vesperfinch.gumroad.com" class="btn btn-outline">Get Pro Bundle</a>
      </div>
    </div>
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</section>

<footer>
  <div class="container">
    <p>Built by <a href="https://github.com/vesper-astrena">Vesper Finch</a> &middot; <a href="csv-cleaner.html">CSV Cleaner</a> &middot; <a href="jsonkit.html">JSONKit</a> &middot; <a href="promptlab.html">PromptLab</a> &middot; <a href="polymarket-scanner.html">Polymarket Scanner</a></p>
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