Draft Visualizer

Take control of your Underdog Fantasy draft portfolio with the rosterOS Draft Visualizer, a powerful, private, and intuitive analytics tool.

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Why Use the Draft Visualizer

  • Instantly upload your Underdog CSV and unlock in-depth insights on player exposures, roster construction, unique stacking trends, and more—everything shown with interactive charts and tables.

  • No logins, no data sent to servers. Your draft information is analyzed securely and instantly right in your browser so you stay in control of your data.

  • Whether you’re optimizing for winning lineups or chasing screenshot equity with bold, brag-worthy builds, this tool helps you level up your draft strategy and gain the edge you need to dominate your drafts this season!

  • Export Your Draft Data from Underdog

    • Log in to your Underdog Fantasy account.

    • Go to your completed NFL 2025 Season drafts.

    • Find the “Email exposure CSV” option and export your draft results as a CSV file.

    • Save the file to your computer.

  • Upload Your CSV File

    • Open the rosterOS Draft Visualizer website in your browser.

    • Click the “Upload CSV” button at the top.

    • Select and upload your Underdog CSV file.

  • Explore Your Draft Portfolio

    • Once uploaded, your data is processed right in your browser (your data never leaves your device).

    • Use the navigation to explore:

      • My Players: See all the players you’ve drafted, including exposure, average draft position (ADP), and closing line value (CLV). Filter by name, team, position, or ADP range.

      • My Teams: Browse all your teams. Filter for specific player combinations, view team CLV, and see positional/game stack breakdowns.

      • Combos & Recommendations: Discover your most common 2-player combos and see recommended player pairs you haven’t drafted together.

      • Charts: Visualize your draft habits with interactive charts, including positional percentage by round, unique players by team, positional breakdowns, draft slot distribution, and team structure histograms.

  • Tips & Privacy

    • All data stays on your device; nothing is uploaded or shared.

    • Use filters and sorting to analyze your portfolio in detail.

    • For the most up-to-date analysis, export your latest Underdog drafts and re-upload them here.

How to Use the rosterOS Draft Visualizer