BoardGameGeek Collection Value Estimator

WHAT IT DOES

BoardGameGeek Collection Value Estimator helps you understand the total market value of your board game collection. The script scans your BoardGameGeek collection page, extracting game names, editions, conditions, and quantities, then estimates each game's current market value using a heuristic pricing model. A visible badge shows the estimated total collection value. Per-game value estimates are displayed with condition-based adjustments—Near Mint (100%), Excellent (85%), Very Good (70%), Good (50%), and Poor (30%). A summary highlights the most valuable games in your collection. The dashboard shows the number of games and average value per game. You can export a complete collection value report for insurance or record-keeping. Filters let you view games by condition or value range.

WHERE IT RUNS

This script runs on BoardGameGeek, specifically on collection pages, owned games lists, and user collection views. It works on both desktop and mobile views, automatically detecting game data from the page.

HOW TO USE

After installing through the BotGentz extension, navigate to your BoardGameGeek collection page. The script automatically scans your collection and displays a value badge. Open the configuration panel to view the full dashboard—total value, game count, average value, most valuable games, and a per-game breakdown with values and conditions. Use the configuration panel to customize your experience: toggle the value badge on or off, show or hide per-game values, show or hide trends, select your currency (USD, EUR, GBP, CAD, AUD, JPY), and set the auto-refresh interval in seconds. Use the "Scan Collection" button to manually re-scan, or "Export Report" to copy a complete collection value report to your clipboard.

COLLECTION DATA EXTRACTION WITH CONDITION-BASED VALUE ADJUSTMENT AND HEURISTIC PRICING

This script implements a collection data extraction engine using DOM traversal with platform-specific selectors for BoardGameGeek's collection elements (.collection-item, .game-item, .row-item). The engine extracts game names, conditions, and quantities from collection page elements. The value estimation uses a heuristic model that adjusts base prices based on game popularity keywords (Gloomhaven, Brass, Pandemic, etc.) with condition multipliers (Near Mint: 1.0, Excellent: 0.85, Very Good: 0.70, Good: 0.50, Poor: 0.30). The statistics engine calculates total value, average value, and identifies the most valuable games. The export generator produces a formatted report with all game values and statistics.

THE PANEL

The configuration panel is fully draggable and remembers its position per-site using GM_setValue. It snaps to screen edges when dragged near them, collapses to a compact bubble when minimized, and supports Escape key for quick collapse. All settings—including badge visibility, per-game display, trends visibility, currency selection, and auto-refresh interval—are persisted across sessions.

PLEASE NOTE

This script requires the free BotGentz extension to run. The script runs on BoardGameGeek and reads game data from collection pages. It does not capture, store, or transmit any personal information. All game data and value estimates are processed locally in your browser and never transmitted to external servers. The script reads only publicly visible collection information displayed on the page. Value estimates are approximate and based on heuristic pricing models—actual market values may vary significantly. This tool is provided for informational and entertainment purposes only.