SisterScore

Our 0–100 rating of every UK gambling site, from what players say about it and about its sister sites: the other sites run by the same company, on the same payments, support desk and ID checks. No casino can pay to change it.

Data as of 10 October 2026Same recipe for every site
87/100
BetGoodwin
737UK sites with a SisterScore
1.4Mplayer reviews behind them
59families of sister sites

90% of UK gambling sites are sister sites

Of the 786 UK-licensed sites open today, 710 share their company and licence with at least one other site. Five companies run 55% of them.

90%710 of 786 sites have a sister
The biggest families

Same company, different experiences

Sister sites share a lot, but players still rate them differently: games, bonuses and design differ from site to site. In 13 of the 28 families where we can compare two or more scored sites, the highest and lowest are 20 points or more apart. That is why a SisterScore leans on the family only until a site has enough reviews of its own.

Lowest to highest SisterScore within each family
050100

Try it: how sister sites shape a score

77% of UK sites have fewer than 100 reviews, too few to judge on their own. So we blend what reviews they have with the scores of their sister sites, and mark the result est. Pick a site and drag the slider: the more reviews it collects, the more its own count. At 100 it gets a measured score of its own.

Does it work? We hid the real score of 175 measured sites and estimated each one from its sisters alone. The estimate was on average 12 points out, against 19 for a UK-wide average.

What players talk about

Across the 178 sites with a measured score, these are the topics recent reviews bring up. Withdrawals come up most. ID checks come up less, but draw the most negative comments: nobody enjoys sending documents.

  • Withdrawals22% of mentions · 65% negative
  • Games and odds22% of mentions · 61% negative
  • Bonuses18% of mentions · 74% negative
  • App and website16% of mentions · 66% negative
  • Customer support15% of mentions · 66% negative
  • ID checks7% of mentions · 81% negative

Recent reviews run cooler than a site's long-run average at 55 sites and warmer at 23, judged on each site's newest few hundred reviews. A trend is shown as a flag; it never changes the score.

The recipe

1,432,495 player reviews from two kinds of source whose leanings point in opposite directions: trusted review sites, where people mostly arrive to complain, and official app store ratings of each site's own app, where people are prompted to rate at happy moments. We correct for both.

  • 80/100
    Great75 and up: players are clearly happy
  • 65/100
    Good60–74: players lean positive
  • 50/100
    Mixed40–59: read the themes before you sign up
  • 30/100
    PoorUnder 40: players lean negative
  1. Review sites are a complaints desk, not a census

    Their score is 45% the share of genuinely happy reviewers (4 and 5 stars) and 55% a star average that softens the pile of 1-star reviews. App ratings stay closer to a plain average.

  2. Small samples are pulled towards the middle

    Each source is pulled towards a typical UK site (58) as if it had 28 extra reviews. Ten glowing reviews barely move it; ten thousand speak for themselves.

  3. Sources are blended by size

    A source counts more as its review count grows, on a log scale, so a big platform outweighs a small one without silencing it.

  4. Repeated comments move the score

    Withdrawals, support, bonuses, ID checks, the app and the games are tagged in recent reviews. Ten or more mentions with at least 70% negative is a penalty; 60% positive is a small bonus. One angry review moves nothing.

  5. Sister sites fill in for missing reviews

    Under 100 reviews, a site's own reviews are blended with the measured scores of its sister sites, weighted by how many reviews each has, and the result is shown as est.

  6. Direction is a separate flag

    When recent reviews average 0.3 stars above or below the long-run average, the site is marked as trending up or down. It does not change the score.

The most searched sites and their SisterScores

The UK sites people look up most, in order of how often they are searched. Open one to see its sister sites, what players say and what we checked.

BetGoodwinGoodwin Racing family
87/100
PlayOJOSkill On Net family
65/100
BetwayBetway family
70/100
MidniteDribble Media family
90/100
ThepoolsThe Football Pools family
84/100
888888 UK family
59/100
LiveScore BetLiveScore Betting and Gaming (Gibraltar) family
69/100
McBookieStar Racing family
42est.
SlingoSkill On Net family
78/100
London BetThistle Bet family
59est.
LadbrokesLC International family
45/100
FitzdaresFitzdares family
64/100

SisterScore FAQ

Why is it called SisterScore?

Because it is the only rating that counts a site's sister sites. Sites run by the same company share payments, support and ID checks, so their players' experiences overlap. For newer sites with few reviews, the family's scores fill the gap.

Can a casino pay to improve its score?

No. Scores are worked out from public reviews by the same code for every site, and nobody edits one by hand. Several sites we can earn commission from have modest scores, and that is the point.

Why is the SisterScore different from a site's star rating elsewhere?

One platform is a lopsided sample: review sites collect complaints, app stores collect praise prompted at happy moments. We correct for both, and a theme only moves a score when many recent reviews name it.

What does est. next to a score mean?

The site has fewer than 100 reviews, so we blend its own reviews with the measured scores of its sister sites. The more reviews it gets, the more its own count. At 100 it becomes a measured score.

Do you republish people's reviews?

No. Review text belongs to the people who wrote it. We publish counts, shares and scores only.

Can I quote these numbers?

Yes, with a link to this page. Figures are from our data as of 10 October 2026; email us for the underlying counts.