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How We Calculate Bonus Scores
Every bonus listed on CasinosAnalyzer comes with a score and a status badge — worked out automatically from genuine player votes, not handed down by editors. This page explains the thinking behind that system: how scores are calculated, what the different labels mean for you as a player, and why the score on a bonus might look different the next time you check.
Why Player Votes Are at the Heart of Our Rankings
Bonus terms written on a page don't always match the reality of actually using a bonus. An offer that reads generously can become a source of real frustration when wagering requirements prove impossible to meet, games you want to play are excluded, or a withdrawal takes longer than it should. The only people who genuinely know what a bonus is like to use are those who've tried it themselves.
That's why all bonuses on CasinosAnalyzer are open to community votes. After claiming a bonus, players can record it as Worked 👍 — fair conditions, achievable requirements, no dramas cashing out — or Not Working 👎 — fine-print surprises, unworkable wagering, or difficulty receiving winnings. These votes flow directly into a calculated score that shapes each bonus's ranking.
No editors picking favourites. No paid placements. Just the honest experience of New Zealand players.
The Problem with Using Simple Percentages
To understand what we do, it helps to first understand why a straight approval percentage doesn`t work well as a ranking tool — particularly for bonuses that haven`t been around long enough to gather many votes.
⚠️ A clear example: Bonus A has 5 votes, all positive — 100% approval. Bonus B has 600 votes, 500 positive — 83% approval. Rank by percentage alone and Bonus A comes first. But should it? With only 5 data points, two unhappy players next week could push it down to 60%. Bonus B`s 83% is built on 600 real reports and is far more dependable.
Treating a sample of 5 and a sample of 600 as equally reliable isn`t fair to players using the rankings to make decisions. Our system is built to address that gap.
SAME APPROVAL RATE — VERY DIFFERENT RELIABILITY
Despite a lower raw approval rate, the bonus with 600 votes ranks higher — because its score is statistically trustworthy.
Wilson Score: The Method We Use
Bonus scores on CasinosAnalyzer are calculated using the Wilson Score Lower Bound — the same statistical method that underlies Reddit`s post rankings, Amazon`s review ordering, and YouTube`s quality signals. It calculates the lower edge of a confidence interval for a bonus`s true approval rate, weighing both the proportion of positive votes and the number of votes supporting that proportion.
Put simply, the Wilson Score answers the question: "Given what we`ve seen so far, what`s the most cautious sensible estimate of how good this bonus really is?" Bonuses with few votes are held to a higher uncertainty standard. Bonuses with a long, consistently positive voting history earn a correspondingly strong score.
✅ Why Wilson Score works well: It always stays between 0% and 100%, with no odd edge-case results. It handles situations like zero dislikes cleanly. And as more votes come in, scores settle steadily rather than swinging from one extreme to another.
The Formula
The Wilson Score Lower Bound at 95% confidence is:
💡 You don't need to follow the maths to benefit from the scores. Simply: a higher Wilson Score means a bonus is both well-liked and supported by enough votes to make that verdict meaningful.
Quality Labels Explained
Every bonus is assigned one of five labels based on its Wilson Score and total vote count. Earning a positive label means clearing minimum thresholds on both at the same time.
| Bonus Score Label | Number of Reactions | Min. Wilson Score | Description |
|---|---|---|---|
| ✅ VERIFIED | ≥ 30 | ≥ 0.50 | Verified, quality bonus |
| ✅ GAINING POPULARITY | Between 3 and 29 | ≥ 0.55 | Strong early signal, still building data |
| ⚡ GATHERING DATA | < 3 | — | New bonus, data still being collected |
| ⚡ UNCERTAIN | ≥ 30 | Between 0.3 and 0.49 | Mixed reactions, not enough clarity to verify |
| ⚠️ LOW QUALITY | ≥ 30 | < 0.30 | Low-quality bonus |
What's Shown on Bonus Cards
Each bonus listing on CasinosAnalyzer includes a performance block — a concise, plain-English summary of what the community has found.
Bonuses that are still gathering their earliest votes display no performance block. Without sufficient data to form a useful view, showing anything would be misleading. Once votes start arriving but the picture is still mixed, the block shows Mixed performance alongside whichever outcome — Worked 👍 or Not working 👎 — the majority of voters reported.
Bonuses that are gaining popularity or have been verified both show Good performance with a Worked 👍 count, reflecting an established record of positive player experience. A low quality bonus shows Poor performance and leads with the Not working 👎 count — a direct signal that problems have been reported consistently.
The numbers you see — for example, "47 of 55 users say it Worked" — are always live vote counts, refreshed each time a new vote is submitted.
Why Scores Can Change
Every vote recalculates the score
The Wilson Score updates each time a player votes. A bonus can move up or down between labels as its vote count increases. Scores are also refreshed automatically every 15–30 minutes to keep all listings current.
New bonuses start with a cautious rating
A bonus with just three all-positive votes begins as GAINING POPULARITY rather than VERIFIED. If the positive pattern holds as more votes accumulate, it will advance to VERIFIED. Starting conservatively protects players from being misled by small samples.
Changed terms are reflected in votes
When a casino adjusts wagering requirements, restricts eligible games, or changes withdrawal conditions on an existing bonus, players voting under the new terms will pull the score in a different direction. A bonus dropping from VERIFIED to LOW QUALITY is a meaningful indicator that something has changed.
Vote history is permanent
Votes are cumulative and cannot be removed. A casino has no way to reset a bonus to GATHERING DATA and start the scoring process over — the full history always contributes to the score.
Frequently Asked Questions
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Why not just count likes — "5 likes and it's verified"?
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Because a bonus with 5 likes and 10 dislikes would then pass verification. The Wilson Score accounts for the ratio of positive to negative votes, not just the number of likes. A high dislike count matters just as much as the likes do.
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Why not simply use the percentage of positive votes?
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One like alone gives a 100% rate, which would rank that bonus above one supported by 800 likes out of 1,000 total votes (80%). Wilson Score prevents this by weighing how large the sample behind the percentage actually is. More votes equals a more trustworthy result.
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Can a casino pay to improve its bonus score?
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No. Scores are calculated entirely from player votes using a fixed formula that applies equally to every casino. There is no editorial mechanism to adjust a score and no payment option that influences a bonus's ranking. The formula and its thresholds are publicly documented.
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How often are scores refreshed?
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Immediately on each new vote, plus an automated background update every 15–30 minutes. The score shown is always current.
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Why might a bonus I've used before now show POOR?
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Casinos occasionally change the terms attached to ongoing bonuses — wagering multipliers, eligible games, maximum cashout amounts. As players encountering the updated terms submit their votes, the score adjusts to reflect their experience. A declining score is often the earliest visible sign that a bonus has become less player-friendly.
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What's the difference between VERIFIED and GAINING POPULARITY?
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Both carry positive signals. VERIFIED requires at least 30 votes and a Wilson Score above 0.50 — a statistically solid base. GAINING POPULARITY means a smaller vote count (minimum 3) but a strong Wilson Score (above 0.55), pointing to consistent early approval. With continued positive feedback and a growing vote count, a GAINING POPULARITY bonus will generally move up to VERIFIED.
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Does this apply across all bonus types?
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Yes — welcome bonuses, no-deposit offers, free spins, reload bonuses, and all other types are scored using the same Wilson Score formula and the same label thresholds. The category of bonus has no bearing on how it's calculated.
Our Commitment to Openness
The system described on this page is the one running behind every bonus score on CasinosAnalyzer New Zealand. We explain it publicly because players deserve to know how rankings are produced, not just be asked to take them on trust. If you've used a bonus and think its score no longer reflects current reality, your vote is the most direct way to bring it in line. Submit it, and the score updates automatically.
