VORTEX EXPERIMENTAL LABORATORY
RANDOMNESS DIVISION · 01

INSIDE THE SPIN

How the Wheel Chooses a Result

Spin the Wheel Lab selects each result with cryptographically strong random values generated by your browser. The winner is chosen from the entries and weights currently on the wheel—then the animation carries the wheel to that result.

No mysterious wheel physics. No last-second switch. Just controlled chaos with documented rules.

Spin the Wheel Build a Custom Wheel
01
RANDOM SOURCE Your browser’s Web Crypto system
02
RESULT TIMING Selected before the main wheel rotation
03
ANIMATION ROLE Presents the result already selected

Quick answer: the selection system chooses the result. The animation controls how that result is revealed.

SPIN THE WHEEL LAB CONTROLLED CHAOS · DOCUMENTED RULES
VORTEX EXPERIMENTAL LABORATORY
OBSERVATION STATION · 02

THE SHORT ANSWER

The result comes first. The animation follows.

What you see spinning is the reveal—not the mechanism deciding which entry wins.

RANDOM SELECTION · TECHNICAL OBSERVATION R-02

Spin the Wheel Lab uses your browser to generate a cryptographically strong random value.

The wheel maps that value across the active entries according to their weights and selects one result. That result is then passed into the main wheel animation.

Winner selection uses the browser’s crypto.getRandomValues() method—not JavaScript’s standard Math.random() function.

RANDOM SOURCE Your browser’s Web Crypto system
WINNER TIMING Selected before the main wheel rotation
ANIMATION ROLE Displays the result already selected

The animation cannot switch the selected entry. Speed, sounds, easing, and visual effects change the presentation—not the chosen result.

REFERENCE DOCUMENT Read the Web Crypto technical reference
SPIN THE WHEEL LAB SELECTION BEFORE PRESENTATION
VORTEX EXPERIMENTAL LABORATORY
SELECTION SEQUENCE · 03

BEHIND THE BUTTON

One spin. Four steps.

The wheel follows the same selection sequence each time. It checks the available choices, calculates their probability ranges, selects one result, and then begins the main wheel animation.

  1. 01 STEP 01

    The wheel checks the active entries

    The wheel uses the choices currently available for selection. If Eliminate removed a previous result, that entry is no longer part of the next spin unless it is restored.

  2. 02 STEP 02

    Each entry receives a probability range

    Entries with equal weights receive equal shares of the total probability. Increasing an entry’s weight intentionally gives it a larger share.

  3. 03 STEP 03

    Your browser generates a random value

    Spin the Wheel Lab requests a cryptographically strong random value from the browser. That value is matched to one of the wheel’s cumulative probability ranges.

  4. 04 STEP 04

    The wheel presents the selected result

    The chosen entry is passed into the main animation. The wheel then rotates to display the result that was already selected.

What the animation controls: timing, speed, easing, sounds, and presentation. What it does not control: which entry wins.

SPIN THE WHEEL LAB FOUR STAGES · ONE RESULT
VORTEX EXPERIMENTAL LABORATORY
PROBABILITY TESTING · 04

EQUAL-WEIGHT WHEELS

Do equal entries have equal chances?

Yes. When every active entry has the same weight, each entry receives the same selection probability on every spin.

SPECIMEN A EQUAL PROBABILITY
25%
EACH ENTRY · EQUAL WEIGHTS

Four entries with equal weights

Each entry holds one of the four available weight units.

ENTRY WEIGHT CHANCE
Choice A 1 25%
Choice B 1 25%
Choice C 1 25%
Choice D 1 25%
The order, color, label length, sticker, texture, and position of an entry do not increase its configured probability.

Each spin is a new selection. Unless you remove or eliminate a result, an entry remains eligible even when it won the previous spin.

SPIN THE WHEEL LAB PROBABILITY · WEIGHTS · ELIGIBILITY
VORTEX EXPERIMENTAL LABORATORY
PROBABILITY CALIBRATION · 05

CONTROL THE PROBABILITY

How do weighted wheels work?

A weight changes an entry’s chance relative to the total weight of every active entry. A higher weight makes a result more likely—it does not guarantee that result will win.

CALCULATION CHAMBER 01 / 02

THE FORMULA

One entry’s share of the total

The wheel adds all active weights together. Each entry’s weight is then divided by that total to determine its expected probability.

EXPECTED PROBABILITY Entry weight ÷ total active weight
Changing one entry’s weight also changes every other entry’s percentage because all probabilities share the same total.
PROBABILITY READOUT 02 / 02

Three choices with different weights

The total weight is four.

WEIGHT DISTRIBUTION 4 TOTAL UNITS
A
25%
B
25%
C
50%
ENTRY WEIGHT EXPECTED CHANCE
Choice A 1 25%
Choice B 1 25%
Choice C 2 50%
Why Choice C receives 50%: it holds two of the four total weight units.
Build a Weighted Wheel
SPIN THE WHEEL LAB WEIGHT DISTRIBUTION · EXPECTED PROBABILITY
VORTEX EXPERIMENTAL LABORATORY
ANIMATION CONTROL · 06

THE REVEAL, NOT THE DECISION

Does the animation decide the winner?

No. The main wheel animation displays a result that has already been selected.

HOW THE RESULT REACHES THE WHEEL

The wheel selects an entry from the active choices and their weights before the main rotation begins. The chosen entry is then passed into the animation so the wheel can finish on that result.

An animated wheel may appear to slow near one segment before continuing to another. That movement is part of the visual sequence—not evidence that an entry was favored, rejected, or switched at the last moment.

CONTROL CHAMBER A 01 / 02
PRESENTATION SETTINGS
WHAT THE ANIMATION CONTROLS

How the spin is presented

  • Spin speed and duration
  • Extra wheel rotations
  • Acceleration and slowing effects
  • Sounds and device feedback
  • Confetti and reveal effects
  • Supported dramatic spin experiences
CONTROL CHAMBER B 02 / 02
SELECTION SETTINGS
WHAT THE ANIMATION DOES NOT CONTROL

Which entry is selected

  • Which active entry wins
  • How an entry’s weight is calculated
  • Whether a duplicate appears in the list
  • Which entries remain after elimination
  • The random value generated by the browser
  • The probability assigned to each entry

The simplest way to think about it: the selection system chooses the result; the animation makes the reveal worth watching.

SPIN THE WHEEL LAB SELECTION ≠ PRESENTATION
VORTEX EXPERIMENTAL LABORATORY
REPEAT DETECTION · 07

RANDOM DOESN’T MEAN ALTERNATING

Why did the same result appear again?

Because repeat results are a normal part of random selection. A previous winner is not automatically less likely merely because it appeared on the last spin.

SPECIMEN A REPEAT PROBABILITY
50% CHANCE ON EACH SPIN

Each spin starts with the current wheel

Unless Eliminate is active, the wheel uses the same active entries and weights again. Past results do not change the next selection automatically.

This means a name, prize, or choice can win twice in a row—or several times during a short session—even when all entries have equal weights.

SIMPLE TWO-ENTRY EXAMPLE
If two entries have equal weights, each receives a 50% chance on every spin. The entry that just won still has a 50% chance on the next spin.

Before starting a no-repeat round, confirm how many distinct winners you need and make sure the wheel contains enough eligible entries.

SPIN THE WHEEL LAB INDEPENDENT SPINS · MANAGED RESULTS
VORTEX EXPERIMENTAL LABORATORY
SIMULATION TESTING · 08

TEST THE CURRENT SETUP

What does Spin Science test?

Spin Science runs 10,000 simulated selections using the wheel’s current entries, weights, and winner-selection method. It compares each entry’s expected probability with the percentage observed during the test.

SIMULATION COUNTER UNIT 08
10,000 SIMULATED SELECTIONS

Run against the wheel configuration currently loaded in your browser.

SCIENTIFIC OBSERVATION · 08-A

Expected odds meet observed results

For every entry, Spin Science shows its weight, expected percentage, observed selection count, and observed percentage. This helps you inspect whether the setup behaves as expected across a large test batch.

The simulation uses the same weighted-selection function used by a regular wheel spin. It performs the selections without running 10,000 full visual animations.

TEST CHAMBER A CAPABILITIES
OBSERVABLE TEST RESULTS
WHAT IT CAN HELP YOU CHECK

Inspect the wheel’s setup

  • Whether the entries currently have equal weights
  • How custom weights change expected probabilities
  • How often each entry appeared during the simulation
  • Whether an accidental weight change affected the setup
  • How observed percentages compare with expected percentages
TEST CHAMBER B LIMITATIONS
OUTSIDE TEST SCOPE
WHAT IT CANNOT DO

Predict or certify a result

  • Predict the next winner
  • Guarantee a future sequence
  • Make a weighted wheel equal-chance
  • Prove that a short run will look perfectly balanced
  • Certify a giveaway, contest, or drawing
  • Verify that the entries themselves are eligible or complete

Variation is expected. Observed percentages will normally differ somewhat from expected percentages. The test examines a large simulated batch; it does not promise what will happen during any individual spin.

Open Spin Science
SPIN THE WHEEL LAB SIMULATED SELECTION · EXPECTED ODDS
VORTEX EXPERIMENTAL LABORATORY
PROBABILITY CONTROLS · 09

KNOW YOUR SETUP

What changes the odds?

The probability changes when the active entries or their weights change. Visual styling and presentation settings do not alter the configured chances.

CONTROL PANEL A PROBABILITY
CHANGES THE SELECTION SETUP
THESE CAN CHANGE THE ODDS

Entries, weights, and eligibility

These actions change the pool or the probability assigned to it.

  • Adding a new entry
  • Removing an active entry
  • Including the same label more than once
  • Increasing or decreasing an entry’s weight
  • Eliminating a previous winner
  • Restoring an eliminated entry with Undo
  • Loading a different list or saved wheel
CONTROL PANEL B PRESENTATION
NO CHANGE TO CONFIGURED ODDS
THESE DO NOT CHANGE THE ODDS

Style, sound, and presentation

These settings can change how the wheel looks or feels.

  • Segment color or text color
  • Stickers and textures
  • Wheel title or subtitle
  • Sound and winner voice
  • Countdown length
  • Animation speed
  • Confetti and winner effects
  • Supported visual spin experiences

Important: styling does not change the odds only when the entries and their weights remain unchanged. Always review the final list and weight settings before an important round.

SPIN THE WHEEL LAB CONFIGURATION VS. PRESENTATION
VORTEX EXPERIMENTAL LABORATORY
TRANSPARENCY STATION · 10

CLEAR CLAIMS. NO LAB-COAT BLUFFING.

Is Spin the Wheel Lab “certified fair”?

No independent certification or third-party audit is claimed. Spin the Wheel Lab documents its selection process and provides tools for inspecting the current wheel setup.

What transparency means here

The wheel’s random source, weighted-selection method, winner timing, and testing behavior can be described from the implementation. Spin Science lets users compare expected probabilities with results from a large simulated test.

Those details provide useful evidence about how the wheel operates. They do not turn the site into an independent auditor, regulator, or certification service.

REFERENCE CHAMBER A DOCUMENTATION
IMPLEMENTATION DETAILS
WHAT WE DOCUMENT

Supported by the wheel’s implementation

  • Browser-generated cryptographically strong random values
  • Cumulative weighted selection
  • Equal probability when active weights are equal
  • Winner selection before the main wheel animation
  • 10,000-selection testing through Spin Science
  • Visible controls for reviewing and changing weights
REFERENCE CHAMBER B LIMITATIONS
CLAIMS NOT MADE
WHAT WE DO NOT CLAIM

Limits that remain limits

  • Independent certification or third-party auditing
  • A guarantee for any individual result
  • Perfectly balanced results during a short sequence
  • Tamper-proof or “provably fair” operation
  • Suitability for regulated gambling
  • Automatic compliance with giveaway or contest laws
SPIN THE WHEEL LAB TRANSPARENCY · LIMITATIONS · RESPONSIBILITY

PRIZES, DRAWINGS & GIVEAWAYS

Can I use the wheel for a giveaway?

Yes—the wheel can randomly select from the entries you provide. It does not verify eligibility, establish promotion rules, or independently audit the drawing.

Prepare the drawing before you spin

A trustworthy result starts with a reviewed list and rules that were established in advance. Complete these checks before the official selection begins.

  1. Establish the rules and eligibility requirements Decide who may enter, how entries are counted, what can be won, and when the drawing takes place.
  2. Verify the final entrant list Confirm that every intended participant is present and remove anyone who is not eligible.
  3. Remove headings, blank rows, and accidental duplicates Review imported or pasted data before it becomes part of the official drawing.
  4. Review every entry’s weight Keep weights equal when every entry should have the same chance. Disclose intentional weighting before the draw.
  5. Decide how invalid or repeat results will be handled Set any redraw, elimination, alternate-winner, or disqualification procedure before spinning.
  6. Test the complete setup Check the list, settings, winner controls, display, and sharing method before the official round.
  7. Preserve your source information Keep an independent copy of the entrant list, rules, and other important records outside the wheel.
WHAT THE WHEEL DOES

Selects from the prepared entries

Spin the Wheel Lab applies the current entry list and weights, generates a random value in the browser, and presents the selected result.

WHAT THE ORGANIZER HANDLES

Rules, eligibility, records, and compliance

The organizer remains responsible for the promotion’s rules, participant eligibility, prize availability, required disclosures, records, platform requirements, and applicable laws.

This information explains how the wheel functions; it is not legal advice. Requirements can vary by promotion, platform, and location.
Explore Prize Wheels Visit the Legal Lab

PRIZES, DRAWINGS & GIVEAWAYS

Can I use the wheel for a giveaway?

Yes—the wheel can randomly select from the entries you provide. It does not verify eligibility, establish promotion rules, or independently audit the drawing.

Prepare the drawing before you spin

A trustworthy result starts with a reviewed list and rules that were established in advance. Complete these checks before the official selection begins.

  1. Establish the rules and eligibility requirements Decide who may enter, how entries are counted, what can be won, and when the drawing takes place.
  2. Verify the final entrant list Confirm that every intended participant is present and remove anyone who is not eligible.
  3. Remove headings, blank rows, and accidental duplicates Review imported or pasted data before it becomes part of the official drawing.
  4. Review every entry’s weight Keep weights equal when every entry should have the same chance. Disclose intentional weighting before the draw.
  5. Decide how invalid or repeat results will be handled Set any redraw, elimination, alternate-winner, or disqualification procedure before spinning.
  6. Test the complete setup Check the list, settings, winner controls, display, and sharing method before the official round.
  7. Preserve your source information Keep an independent copy of the entrant list, rules, and other important records outside the wheel.
WHAT THE WHEEL DOES

Selects from the prepared entries

Spin the Wheel Lab applies the current entry list and weights, generates a random value in the browser, and presents the selected result.

WHAT THE ORGANIZER HANDLES

Rules, eligibility, records, and compliance

The organizer remains responsible for the promotion’s rules, participant eligibility, prize availability, required disclosures, records, platform requirements, and applicable laws.

This information explains how the wheel functions; it is not legal advice. Requirements can vary by promotion, platform, and location.
Explore Prize Wheels Visit the Legal Lab

BENEATH THE FLOORBOARDS

Technical summary

A compact reference for visitors who want the implementation details without digging through the full wheel code.

Spin the Wheel Lab winner selection Current browser-based wheel implementation

CODE REVIEWED

RANDOM SOURCE
The browser’s Web Crypto API through crypto.getRandomValues().
RANDOM VALUE
A 32-bit unsigned value converted to a number from zero up to, but not including, one.
SELECTION METHOD
Cumulative weighted selection across the wheel’s active entries.
DEFAULT WEIGHT
Entries normally begin with a weight of 1.
INVALID WEIGHT HANDLING
A missing, invalid, zero, or negative weight is treated as weight 1 during winner selection.
WINNER TIMING
The result is selected before the main wheel rotation begins.
ANIMATION ROLE
The animation carries the wheel to the entry that was already selected.
SPIN SCIENCE
Runs 10,000 simulated selections using the same weighted winner function used by a regular spin.
SELECTION LOCATION
Winner selection is performed in the visitor’s browser.
Browser requirement: winner selection requires support for crypto.getRandomValues(). If secure random selection is unavailable, the wheel should ask the visitor to update or change browsers instead of silently using a weaker winner-selection method.

Last reviewed against the wheel code: October 19, 2026

Web Crypto technical reference

THE FINAL LAB NOTE

Built for decisions.
Not destiny.

A wheel is useful when a set of acceptable choices needs one impartial pick. You prepare the options and rules. Spin the Wheel Lab selects among the active entries using the probabilities you configure.

You choose the options. The Lab chooses among them.
Use human judgment when the stakes are high. A random wheel should not replace qualified judgment for medical, legal, financial, employment, emergency, safety-critical, or other high-stakes decisions.
Spin the Free Wheel Create My Own Wheel

Have a question about a result or wheel setting? Send a Lab Note or review the Legal Lab .