About

Decision fatigue is a real psychological phenomenon where the quality of decisions deteriorates after a long session of decision-making. Whether you are a teacher assigning groups, a project manager distributing tasks, or simply a group of friends deciding on a dinner spot, removing the human element ensures fairness and speed. This tool acts as an unbiased external arbiter, utilizing a cryptographically strong pseudo-random number generator (CSPRNG) where supported, or a high-entropy fallback.

Unlike simple randomizers, this suite includes three distinct engines: a Visual Wheel for engagement and suspense, a Rapid Picker for high-volume raffles, and a Team Generator that utilizes the Fisher-Yates Shuffle algorithm to create mathematically balanced subgroups. Accuracy is paramount here; in a raffle of 10,000 entries, even a 0.01% bias can alter outcomes significantly over time.

Formulas

To ensure that every permutation of a group (for team generation) is equally likely, we employ the Fisher-Yates Shuffle. A naive shuffling approach (like swapping random pairs) often introduces bias. The correct mathematical implementation is:

{

For i from n−1 down to 1 do: j ← random integer such that 0 ≤ j ≤ i exchange a[j] and a[i]

When selecting a single winner from a list of size N, the probability P of any specific individual x being chosen must satisfy:

P(x) = 1N

Reference Data

Mode	Algorithm Complexity	Best Use Case	Fairness Model
Spin Wheel	O(n) visual	Classrooms, Livestreams, Games	Uniform Distribution (Sector Area)
Instant Pick	O(1)	Raffles, Quick Decisions	Math.random mapping
Team Gen	O(n) shuffle	Workshops, Sports, Projects	Fisher-Yates (Knuth) Shuffle
Secret Santa	O(n) derangement	Holiday Events	Cyclic Permutation (No self-pick)
Weighted	O(log n)	Lottery, Handicaps	Cumulative Distribution Function

Frequently Asked Questions

No. The physics engine calculates a random friction and initial velocity the moment you click "Spin". The final stopping angle is calculated using a uniform random distribution, ensuring that every slice has a mathematically identical chance of being the stopping point.

The algorithm prioritizes filling all groups to the minimum size first. If you have 10 people and want 3 teams, the system will create two teams of 3 and one team of 4 (3+3+4=10). It distributes the "remainder" participants randomly across the groups.

Yes. The text area accepts standard line-separated values. You can simply copy a column from Excel or Google Sheets and paste it directly into the input box. The tool automatically trims empty lines and whitespace.

Yes. We utilize ARIA Live Regions to announce the winner. When the wheel stops or a name is picked, the focus shifts to the result modal, and the text is read aloud by screen reader software (NVDA, VoiceOver, JAWS).

No. This tool operates entirely "Client-Side" in your browser. The names you type are stored in your device's temporary memory (RAM) and are never transmitted to our servers or stored in a database.