Free Tool

Design the Odds. Simulate the Reality.

Build weighted loot tables and gacha banners, add soft/hard pity, then run Monte Carlo simulations to see percentiles and unlucky tails before players do.

Open Loot Table Designer See Features
Loot Table Designer showing table editor, probability chart, and pity controls

Why It’s Useful

🎲

Player-Experienced RNG

See percentiles (median/95th/99th) and dry streaks, not just theoretical probabilities.

🎰

Pity and Bad-Luck Protection

Model soft and hard pity so you can balance fairness and excitement.

📊

Visual Probability Breakdown

Switch between per-item and per-tier views to sanity-check your distribution quickly.

🧾

Export to Your Engine

Generate JSON/CSV and code templates for Unity, Godot, Lua, and JavaScript.

📋

Fast Table Setup

Start from presets or bulk-import CSV/JSON to iterate quickly.

🔗

Shareable Configurations

Send a URL to teammates so design + engineering stay aligned.

Loot Table Features

Loot Table Builder + Tier Coloring

Edit items, weights, and rarity tiers in one place. Add an explicit “No Drop” outcome when you need empty rolls.

  • Per-item probability + “1 in X” odds
  • Tier colors for quick scanning
  • Reorder items and bulk import CSV/JSON
Loot table editor with rarity tiers and computed odds

Monte Carlo Simulation (Percentiles + Unlucky Tail)

Simulate thousands of players to see how many rolls it takes to get a target item, plus dry streaks and distribution histograms.

  • Median/95th/99th percentile rolls
  • Histogram of rolls-to-target
  • Actual vs expected counts per item
Simulation results showing percentiles, histogram, and item distribution table

Export to JSON/CSV and Engine Templates

Copy/paste export templates so implementation matches design intent. Useful for prototypes and handoff to engineering.

  • JSON + CSV exports
  • Unity C# template
  • Godot GDScript template
  • Lua + JavaScript templates
Export panel showing generated JSON and engine code templates

Common Questions

Pity increases the chance of receiving an item in the selected rarity or higher after a number of misses. It does not guarantee a specific item inside that tier.
Monte Carlo makes the “unlucky tail” obvious: you can see how many players go 50+ rolls without success even when the average looks fine.
Yes. Use the Import CSV/JSON button in the Loot Table section to paste a list of items and weights.

Ready to Tune Drop Rates with Confidence?

Free to use. No signup required.

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