Card game tools

Built for game night

The score calculator replaces the pencil and paper: add as many players as you need, type each round's points or count a hand with the built-in counter, and it keeps the totals and tells you who reached the target. It uses the standard values — numbers at face value, action cards 20, wild cards 50 — and works for Crazy Eights and other shedding games too.

Riot Lab and Pass & Play complete the kit. Riot Lab turns any combination of twenty rules into a table you can play against the computer and share as a link; Pass & Play seats two to four people around one device and hides each hand between turns, so a phone on the coffee table becomes the whole card game — no deck to shuffle, no cards to lose.

Both tools work on any phone, tablet or laptop and need no sign-up. The score sheet is stored only in your browser, so it survives a closed tab but never leaves your device. When a game is over, press New game to keep the same player names and start again from zero.

The house rules generator is for groups that want something new. Roll two to five rules, read them out, and if you want to see how they play first, one tap opens a free Prism Riot table with exactly those rules. Everything on this site is free and needs no account.