What Are Casino Sister Sites?

Written by Alex Morris
Last updated 5th July 2026

Sister sites are the organising fact of the British online casino market, and this page is the plain-English explanation of the concept this entire website is named after. Two casinos are sister sites when the same operating company runs them both on the same Gambling Commission licence. That single sentence sounds dry, but it decides which bonuses you can claim, where your self-exclusion applies, how your money is handled and what happens when you complain. Here is the concept unpacked properly.

A definition you can actually use

Take any UK casino and scroll to its footer. You will find an operating company and a licence account number. Every other website listed under that same account on the Commission’s public register is a sister site of the one you started from. Not “similar site”, not “recommended alternative”, but the same business wearing a different outfit. The register’s trading-names list is the definitive roster, which is why our licence checking guide treats it as the first stop for every review we write. The scale surprises people: a licence carrying two or three brands is the exception in this market, and rosters running to dozens of trading names are entirely routine.

Why operators run so many brands

Running one casino well is expensive; cloning it is nearly free. Once a company has a licence, a platform, a payments stack and a compliance team, each additional brand costs little more than a domain, a design and some marketing spend. Separate brands let an operator chase separate audiences, so a pink-and-fluffy bingo skin, a pirate-themed slots site and a sleek “VIP” casino can all funnel players into the same back office. Multiple brands also mean multiple shop windows in search results and app stores, and if one brand’s reputation sours, the others carry on unbruised. There is a defensive logic too: shelf space in a crowded market goes to whoever fills it first, and an operator with forty names simply occupies more of the places a new player might land than an operator with one. The economics are covered in more depth in our white-label guide, but the short version is that skins multiply because nothing about the model discourages it.

How to identify sisters yourself

Licence-number matching is the only reliable method. Footer text can lag reality and third-party lists rot quickly, but two sites displaying the same account number, with both domains present on the register entry, are sisters as a matter of public record. Everything else is inference: matching layouts, identical terms pages, the same support email domain or the same payment descriptor are strong hints, but brands migrate between operators often enough that we treat the register plus the live footer as the only combination that settles it. That discipline, described on our how we review page, exists because we have watched brands change hands and old groupings quietly become wrong.

What sister sites share

Behind the branding, sisters share nearly everything structural. The games catalogue comes from the same aggregated suppliers, so the slots lobby differs mainly in which titles are promoted on the front page. The cashier, deposit methods, withdrawal speeds and verification process are common, and so are the safer-gambling tools: deposit limits, time-outs and operator self-exclusion apply at the account or licence level, while GamStop covers every UK licence at once, as our GamStop and sister sites guide explains. Customer support is typically one team answering under many names, and the terms and conditions are usually the same document with the brand name swapped.

What actually differs between them

The differences are real but thin: theme and presentation, the welcome offer’s headline shape, which games are given homepage billing, and sometimes the loyalty scheme. Occasionally a network runs genuinely distinct tiers, with a flagship brand getting better promotions than its budget stablemates. That is worth knowing when choosing where in a network to play, and it is why our hub pages, like the ones for Jumpman Gaming’s 38 brands and Broadway Gaming Ireland’s roster, describe each brand individually instead of pretending fifty skins are fifty experiences.

Three myths worth clearing up

A few misconceptions come up constantly in reader emails. First, “sister site” does not mean endorsement: two brands sharing a licence says nothing about quality, only about ownership, and a poor operator’s network is simply the same poor service repeated. Second, sisters do not share your gambling history with unrelated casinos; the sharing happens inside one operator’s systems and, for self-exclusion, through GamStop’s central database, not through some industry-wide dossier. Third, moving to a sister site is not a way to reset limits, cool-offs or exclusions, because those controls live at exactly the level the brands share. Anyone marketing a sister brand to you as a workaround for a control you set is describing a compliance breach, not a feature.

It is also worth repeating that networks change shape. Brands are sold between operators, licences are surrendered, and a roster that was accurate in 2024 may be wrong today, which is why every page here records when it was last checked and why we re-verify against the register on every update.

Why any of this matters

Three practical reasons. Bonuses: networks almost always cap welcome offers at one per person or household across all brands, so touring a network for sign-up deals is a fast route to voided winnings. Self-exclusion: excluding from one brand at operator level closes the whole family, and GamStop closes every licensed site in Britain, so there is no fresh start two domains along. And accountability: when something goes wrong, the entity you escalate against is the operator, not the brand, so knowing who really runs your casino means knowing their record across their entire network. That is the case for caring, and it is the research this site does so you do not have to.

Sister site basics: FAQs

What exactly makes two casinos sister sites?

A shared operating company. If the same licensee runs both brands, listed under one account on the Gambling Commission’s register, they are sister sites, sharing a platform, cashier and compliance setup regardless of how different they look.

Can I claim a welcome bonus at every sister site in a network?

Usually not. Most networks limit new-player offers to one per person, household or IP address across all their brands, and claiming several is treated as bonus abuse. Read the promotion terms before assuming a fresh brand means a fresh offer.

Are sister sites a bad sign?

No, they are simply how the UK market is structured. A well-run operator’s sister sites all inherit its strengths. The point of identifying them is information: knowing the operator tells you what service to expect and which other brands share your limits and exclusions.

How do I find all the sister sites of a casino I use?

Find the licence account number in the casino’s footer, look it up on the Gambling Commission’s public register, and open the trading names section. Every domain listed there under the same account is a sister site. Our network hub pages map these families brand by brand.