About — GameStation Tools

What this site is

GameStation Tools is a collection of free browser-based calculators for players of gacha and loot-driven games. The goal is narrow: take a question players argue about — is 90 pulls enough, what does pity really cost, is this artifact better — and answer it with the actual probability model instead of a rule of thumb.

How the calculators are built

Every tool runs entirely in your browser with plain JavaScript. Nothing you type is sent to a server, stored, or shared. The models are standard probability: geometric distributions for independent pulls, a pull-by-pull state model for pity and 50/50 guarantees, and simple linear scoring for crit value.

Where the game data comes from

Preset rates are compiled from publicly announced rates and community-tracked data. Publishers change rates, and regional versions can differ, so presets are labelled as approximations and every tool lets you enter your own numbers. If a preset disagrees with your in-game details screen, trust the game and use the custom fields.

Independence

This site is not affiliated with, endorsed by, or sponsored by any game publisher. Game names, character names and rates are the property of their respective owners and are used here only to describe what a calculator does.

How the site is funded

Hosting is paid for by the operator. If advertising is introduced in future, it will be clearly labelled and will never influence the numbers a calculator produces.

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