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If you search for Kwiff sister sites, you will find plenty of betting sites described as alternatives. But an alternative bookmaker is not necessarily a sister site.
The latest UK Gambling Commission records give a much clearer answer. Kwiff operates under Eaton Gate Gaming Limited, UKGC account 44448, and the same licence currently lists grpcasino.com and slotsking.com as active domains alongside Kwiff.
That makes GRP Casino and SlotsKing the two clearest current Kwiff sister sites based on the present licensing structure.
You can also compare other verified relationships in our UK betting sister sites directory.
Kwiff Sister Sites: Quick Answer
| Brand | Relationship to Kwiff | Current Status |
|---|---|---|
| Kwiff | Main brand under Eaton Gate Gaming | Active |
| GRP Casino | Same licence and Kwiff Limited structure | Active |
| SlotsKing | Same UKGC licence | Active |
The important distinction is that these are not merely sites that look like Kwiff or offer similar betting products.
Their connection can be traced through the current Eaton Gate Gaming UKGC record.
GRP Casino: The Strongest Verified Kwiff Sister Site
GRP Casino has the clearest direct corporate connection to Kwiff.
Its domain, grpcasino.com, is currently listed as active under Eaton Gate Gaming Limited’s UKGC account 44448, the same licence that includes Kwiff.
There is additional evidence beyond the shared licence.
GRP’s current app information identifies the casino as being operated by Kwiff Limited, while Kwiff’s own legal information states that Kwiff Limited is wholly owned by Eaton Gate Gaming Limited.
That gives us a fairly straightforward relationship:
Eaton Gate Gaming Limited → Kwiff Limited → Kwiff / GRP Casino
Kwiff’s own terms and conditions explain that Eaton Gate Gaming provides gambling facilities in Great Britain through Kwiff Limited as its named agent.
So GRP Casino is not just a similar casino appearing on an affiliate list. It is part of the same current operating structure.
Is SlotsKing a Kwiff Sister Site?
Yes, based on the current UKGC licence record.
slotsking.com is currently listed as an active domain under Eaton Gate Gaming Limited’s account 44448, alongside Kwiff and GRP Casino.
That makes SlotsKing a current same-licence sister site.
This is also one of the main reasons some existing Kwiff sister-site pages are now inaccurate.
Several older guides either omit SlotsKing or describe it as inactive. The current regulator record now shows otherwise.
We would not go further and claim that every part of SlotsKing’s internal operation is identical to Kwiff without separate evidence. What we can verify is the important part for this search:
SlotsKing currently sits on the same active UK gambling licence as Kwiff.
Why Do Some Kwiff Sister-Site Lists Only Show GRP Casino?
Because bookmaker structures change.
Some guides were published or checked when SlotsKing was not being presented as a current active sister site. Those pages can remain in Google long after the underlying licence record changes.
The current UKGC record now lists:
kwiff.comkwiff.co.ukkwiffcasino.comgrpcasino.comslotsking.com
as active domains associated with Eaton Gate Gaming Limited.
So if an older article says Kwiff has only one sister site, it is worth checking when that information was last verified.
This is why BetBuzz24 checks the regulator first rather than relying on old sister-site lists.
Who Operates Kwiff?
The UK licence holder is Eaton Gate Gaming Limited.
The company holds UKGC account 44448 and has remote betting and casino permissions.
Kwiff’s own terms state that Eaton Gate Gaming Limited provides gambling facilities in Great Britain through Kwiff Limited as its named agent.
Kwiff Limited is a Malta-registered company and is described by Kwiff as a wholly owned subsidiary of Eaton Gate Gaming Limited.
The useful operating structure is therefore:
Eaton Gate Gaming Limited → Kwiff Limited → Kwiff
The UKGC’s trading-name record currently lists Kwiff as the active trading name, while the separate domain record includes GRP Casino and SlotsKing.
That is why we describe GRP Casino and SlotsKing as same-licence sister sites, rather than pretending all three names appear identically in every part of the register.
Who Owns Kwiff?
Companies House records for Eaton Gate Gaming Limited identify Bengt Anders Stefan Ström as the active person with significant control.
The filing shows that he holds:
- more than 25% but not more than 50% of the shares; and
- more than 50% but less than 75% of the voting rights.
You can check the current Companies House ownership record.
The accurate conclusion is that Anders Ström has controlling voting rights in Eaton Gate Gaming Limited.
It would be too simplistic to say he personally owns 100% of Kwiff.
For someone looking for Kwiff sister sites, the more useful fact remains that Kwiff, GRP Casino and SlotsKing currently appear within the same UK licensing structure.
Does Sharing a Licence Mean the Accounts Are Shared?
Not necessarily.
A shared UKGC licence is strong evidence of a genuine operator relationship. It does not automatically prove that every customer-facing part of the businesses is shared.
You should not assume that Kwiff, GRP Casino and SlotsKing necessarily use the same:
- login;
- customer balance;
- betting limits;
- withdrawal process;
- promotions;
- bonus eligibility.
Those details have to be checked against each site’s own terms.
So the safe distinction is:
same licence = verified operational relationship
but not automatically:
same account, wallet or promotional rules
That is an important difference when comparing betting sister sites.
Are Other “Kwiff Sister Sites” Actually Related?
A lot of pages targeting this keyword include unrelated bookmakers.
They may be perfectly valid Kwiff alternatives, but that does not make them sister sites.
For BetBuzz24, we separate:
Genuine sister relationship
A current ownership, operator or licensing connection can be verified.
Alternative bookmaker
A site may offer similar sports betting or casino products but has no verified corporate relationship with Kwiff.
Based on the current evidence, GRP Casino and SlotsKing belong in the first category.
Random bookmakers included because they have similar promotions do not.
For more examples of how we classify these relationships, see our Betting Sister Sites UK guide.
Eaton Gate Gaming’s Regulatory History
There is one regulatory point worth recording.
In December 2022, the UK Gambling Commission imposed a £480,305 financial penalty on Eaton Gate Gaming Limited following anti-money-laundering and customer-interaction failings.
The Commission also recorded that the operator cooperated with the investigation and took corrective action.
The full decision is available in the UKGC regulatory action record.
This does not change which sites are related to Kwiff, but it is part of the documented history of the operator behind the brand.
Are GRP Casino and SlotsKing the Same Type of Site as Kwiff?
Not exactly.
Kwiff is strongly positioned around sports betting, while GRP Casino is more casino-focused.
SlotsKing also sits on the same current licence, but the three brands do not need to offer identical products to be related.
That is another reason sister sites and alternatives should not be treated as the same thing.
A sister-site relationship tells you how the businesses are connected.
It does not mean the customer experience will be identical.
Frequently Asked Questions About Kwiff Sister Sites
What are the current Kwiff sister sites?
The current UKGC record lists GRP Casino and SlotsKing as active domains under Eaton Gate Gaming Limited, the same licence holder behind Kwiff.
Is GRP Casino a Kwiff sister site?
Yes. GRP Casino is listed under the same UKGC licence as Kwiff, and its operating information also links it directly to Kwiff Limited.
Is SlotsKing still related to Kwiff?
Yes. The latest UKGC domain record currently lists slotsking.com as active under Eaton Gate Gaming Limited, account 44448.
Who owns Kwiff?
Eaton Gate Gaming Limited sits behind Kwiff’s UK licensing structure. Companies House records show Anders Ström has controlling voting rights in the company.
Do Kwiff sister sites share the same account?
A shared licence does not by itself prove shared customer accounts, balances, limits or promotions. Those details need to be checked in each site’s current terms.
Kwiff Sister Sites: The Bottom Line
The current relationship is relatively simple.
GRP Casino and SlotsKing are the two clearest current Kwiff sister sites.
Both currently appear as active domains under Eaton Gate Gaming Limited’s UKGC account 44448.
GRP Casino also has a direct operating connection through Kwiff Limited, making its relationship particularly clear.
SlotsKing is the important recent status change. Some older pages still omit it or describe it as inactive, while the current UKGC record lists it as active.
Other betting sites may be alternatives to Kwiff, but without a verified ownership, operator or licensing connection, they should not be presented as genuine sister sites.
Last verified: 16 September 2026.
