Tools & Platforms
Rollful
Rollful is a hosted dice-rolling API. It rolls dice over HTTP: a request carries a formula, and Rollful parses it, rolls each die through a cryptographically secure generator, and returns every die it rolled rather than only the total.
It is not tied to any game system. It knows what 4d6kh3 means and nothing about what the caller uses it for, so it suits a virtual tabletop, a character sheet, a Discord bot, or anything else that needs a roll it can show the working for.
The formula grammar covers flat modifiers, advantage and disadvantage, keeping the highest or lowest dice, exploding and penetrating dice, multipliers, several terms in one roll, and tags. The response lists every die with a flag saying which ones counted, so an interface can show the die a keep rule dropped instead of hiding it.
A GET request handles a plain formula. POST adds bonuses and tags, and a batch endpoint takes up to 20 rolls in one request. Every response and error has the same documented shape, described by an OpenAPI 3.1 document. There is no account and no API key. Usage is rate limited rather than metered.
The homepage carries a form for rolling dice straight from the browser. Rollful is powered by the OpenDice npm package, which is free to use directly in any JavaScript or TypeScript project.