How we rate
Trust is our product. Every rating on Gamblerfy is based on evidence, follows a consistent method, and shows the date it was last checked. Here's exactly how it works — and you can run the numbers yourself with our free tools.
The Bonus Value Score (0–100)
A headline like "100% up to $500" says almost nothing about what a bonus is really worth. Our score estimates the real expected value of an offer from its terms. Each factor below links to a plain-English guide, and you can compute the score for any offer in the Bonus Value Calculator:
- Wagering (rollover) and whether it applies to bonus only or deposit + bonus.
- Game contribution and the effective house edge you must play through.
- Maximum cashout on winnings from the bonus.
- Minimum odds / eligible games and any excluded games — plus whether the bonus is sticky or cashable.
- Expiry — whether the required play is realistic in the time given.
The full formula and its assumptions are published so anyone can check our math. Every number is verified before it goes live. For the warning signs that drag a score down, see our bonus red flags checklist.
A worked example
Here's why the headline is never the score. This is a generic illustration — not a real operator's offer — of a common bonus run through the method:
| Step | Figure |
|---|---|
| Headline offer | 100% deposit match up to $100 |
| Wagering (35× the bonus) | 35 × $100 = $3,500 must be staked |
| Game played | Slots at ~96% RTP → house edge ~4% |
| Expected cost to clear it | ~4% × $3,500 ≈ $140 |
| Real value of the "$100" bonus | Expected cost to unlock (~$140) exceeds the $100 — low real value |
Change one term — 20× instead of 35×, or a game contributing 100% at 98% RTP — and the value swings hard. That's the whole point of scoring the terms, not the poster. Put real numbers on any offer yourself with the Bonus Value Calculator.
Tools that use this method
- Bonus Value Calculator — score any bonus 0–100 (deposit match, no-deposit, cashback or sticky).
- Odds Converter — decimal ⇄ fractional ⇄ American, plus implied probability.
- Margin & Fair Odds Calculator — the bookmaker's margin (vig) and the no-vig fair odds.
Betting-site ratings
Every bookmaker review carries an editorial score out of 10 (shown as a /10 figure and a star rating). It's a weighted average of six criteria, each scored on the evidence we gather:
Each review shows the sub-score and the reason behind it, so you can see exactly how the overall figure was built. Bonus figures and exact licence details change often and vary by country, so we describe them qualitatively and tell you to confirm the current terms on the operator's own site — we never publish a number we haven't verified, and reviews go live only once checked.
Independence & how we're funded
Gamblerfy may earn a commission when you sign up through our links. This never affects a rating: which brands appear, and what we say about them, is decided only by the official register and the method above — not by who pays — and any affiliate relationship will be clearly disclosed. See our editorial policy for the full picture.
We tested that claim against our own data
A promise of independence is easy to write and hard to check, so on 20 July 2026 we measured it. Across 1,517 rated reviews, brands whose offers we can currently monetise score a mean 6.60 on trust, while brands whose offers are blocked purely by local law — where we have made no judgement about the operator at all — score 5.71. That is a gap of 0.89, and we are publishing it rather than sitting on it.
We cannot tell you which way the causation runs. The innocent explanation is real: the operators we can monetise tend to be the larger, longer-established, better-licensed ones, and they should score higher. The uncomfortable explanation is also possible: that a rater is gentler with a brand that pays. The comparison group is only 24 brands, which is too small to settle it either way. What we can say is that the gap exists, that we looked for it deliberately, and that we will keep measuring it.
The same audit found something we could fix outright. Until that date, 869 of our reviews published an overall score that was not actually the weighted average of its own subscores — and the drift ran 640 up against 229 down, a median of +0.11 in the operators' favour. Nobody decided that; it accumulated from hand-set numbers over hundreds of edits. We recomputed every score from its subscores (895 changed, 647 downward) and tightened our automated check so a score can now differ from its subscores by no more than rounding. The subscores and their written reasons were not touched — only the arithmetic, so the number means what this page says it means.
A known gap in our bonus data: withdrawal caps
Some welcome offers cap how much of your bonus winnings can ever become real money, regardless of what you win. Princess Casino in Romania advertises up to 3,000 RON, but its own terms cap conversion at 1,500 RON — half the headline is unreachable by design. A cap like that matters more than the size of the bonus, and it is the term affiliate summaries most often leave out. We found that one only by reading the operator's terms page directly.
So we measured our own coverage, and we would rather publish the result than imply we had checked everything. Of the 4,007 live offers on this site, 2,465 record a wagering figure but only 74 record a maximum-withdrawal cap. We document wagering roughly thirty times more often than we document caps.
What that means when you read a page here: if a page does not mention a withdrawal cap, that is not evidence there is not one. It usually means we have not verified the point. Where we have checked, we say so. Where a headline figure looks unusually large, assume a cap may exist and read the operator's terms before depositing — and tell us, because we will add it.
We also checked whether the gap is uniform, and it is not. The ten largest uncapped figures in our data all belong to bet365, and reading its terms confirms there is genuinely no cap and no wagering on Bet Credits: winnings go to your withdrawable balance as real cash. The stake itself is not returned, because the credits are non-withdrawable. So a missing cap is sometimes simply the truth, and we are not going to imply every large headline hides one.
We are closing this gap operator by operator, starting with the largest advertised figures. It is slower than writing new reviews, and it is worth more.
Freshness & corrections
Bonuses and terms change often. We re-check offers on a schedule and whenever an operator changes its terms, and we date every page. Spot something wrong? Tell us and we'll fix it fast.
Safety first
We only cover operators licensed in your country, and we state harmful terms plainly. Gambling should be entertainment, never a way to make money. Play responsibly. For the legal backdrop, see our reference on gambling advertising rules by country.