Randa: Random Picker & Dice

Ridgeline Carpentry LLC

About this app

Randa rolls dice, picks numbers, shuffles lists, flips coins and splits teams — and it is careful about fairness in a way most random apps are not.

Everything runs offline on your device. There is no account, no sign-up, no ads, and the app requests zero Android permissions.

WHAT YOU GET

• Dice with real notation
2d20+3, 4d6, d100 — whatever you need. Every roll shows the total and the individual dice, and the history draws the distribution so you can see the shape it should have.

• Numbers that are actually uniform
Picking 1 to 100 by taking a random number modulo 100 is slightly biased toward the low end. Randa uses rejection sampling instead, so every value is exactly as likely as every other. The app explains the method in four steps.

• Lists, with or without weights
Save a list, pick one at random, shuffle the whole thing, or give items different weights and still get a fair draw.

• Draws for everyday arguments
A coin, a yes or no, a spin wheel, a shuffled order for who goes first.

• Team splits that nobody can complain about
Eleven people into three teams is not even, so Randa shuffles the whole list first and deals round-robin, then tells you which team got the extra place and that it was chosen at random.

• Shuffles done properly
Fisher–Yates, walked backwards, which is the only shuffle that gives every possible order the same chance.

• Eight background themes
A full Appearance section with eight crafted backgrounds and a modern, animated navigation bar.

PRIVACY FIRST
Randa collects nothing. Your lists and roll history stay in local storage on your device. There is no account, no internet connection and zero permissions.

WHO IT IS FOR
Tabletop players, teachers splitting a class, anyone running a draw, and anyone who cannot decide where to eat.

Randa is a tool and a toy. It is not a cryptographic source, and it says so.

VISUAL DISCLOSURE
The included screenshots are produced from high-fidelity pixel-faithful renders of the native Android application interface.