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GRP Casino currently has two clear sister-site connections in Great Britain: Kwiff and SlotsKing.
All three appear under Eaton Gate Gaming Limited, UK Gambling Commission account 44448. The current UK Gambling Commission domain record lists GRP Casino, Kwiff and SlotsKing as active brands on the same licence.
That is a smaller network than some older GRP Casino sister-site lists suggest, but it is also much easier to verify.
For more operator relationships, see our UK Betting Sister Sites directory.
Current GRP Casino Sister Sites
| Brand | Main focus | Relationship |
|---|---|---|
| Kwiff | Sports betting & casino | Same Eaton Gate Gaming licence |
| SlotsKing | Casino & slots | Same Eaton Gate Gaming licence |
For someone looking specifically for another casino, SlotsKing is the closest match.
Kwiff is a genuine sister-site connection too, but its main identity is sports betting rather than casino gaming.
Is Kwiff a GRP Casino Sister Site?
Yes.
Kwiff and GRP Casino both currently operate under Eaton Gate Gaming Limited’s UKGC account 44448.
Kwiff is the better-known brand of the two, with a much stronger focus on sports betting alongside casino products.
The operator relationship is direct, but GRP Casino and Kwiff remain separate brands with their own customer-facing websites and products.
We cover the wider Kwiff network separately in our Kwiff Sister Sites guide, so there is no need to repeat the entire structure here.
Is SlotsKing a GRP Casino Sister Site?
Yes, and this is the connection older articles are most likely to miss.
slotsking.com currently appears as active under Eaton Gate Gaming Limited on the UKGC register alongside GRP Casino and Kwiff.
That makes SlotsKing a current same-licence sister brand.
It is also the closest GRP Casino alternative from a product point of view because both are primarily casino-led rather than sportsbook-led.
If you find a GRP Casino sister-site article claiming Kwiff is the only sister site, check when it was last updated. The operator network has changed.
Why Do Some GRP Casino Lists Mention Only Kwiff?
Because SlotsKing appears to be a newer addition to the current Eaton Gate Gaming network.
Older competitor articles were written when GRP Casino and Kwiff were the most obvious names connected through account 44448.
That information can remain online long after the licence changes.
The current UKGC record is therefore more useful than copying an older sister-site list.
As of the latest record, the distinct active consumer brands are:
- GRP Casino
- Kwiff
- SlotsKing
Other Kwiff URLs and app-related entries on the licence should not be counted as separate sister brands.
Who Operates GRP Casino?
GRP Casino operates in Great Britain through the Eaton Gate Gaming Limited UKGC licence.
There is an extra layer to the structure, though.
The current GRP Casino App Store listing states that Kwiff Limited operates GRP Casino as the named agent of Eaton Gate Gaming Limited, and that Kwiff Limited is wholly owned by Eaton Gate Gaming Limited.
That means the cleanest way to describe the setup is:
Eaton Gate Gaming Limited → licensed gambling operator
Kwiff Limited → operating agent
GRP Casino → customer-facing casino brand
Kwiff’s own corporate information also identifies Eaton Gate Gaming Limited as the relevant licensed company under UKGC account 44448.
This distinction matters because brand ownership, trademark ownership and the licensed gambling operator are not always the same thing.
What About Spryme Ltd?
GRP Casino material has also referenced Spryme Ltd in connection with the GRP brand or trademark.
That should not be confused with the current regulated operator.
For UK sister-site purposes, the important relationship is the one shown on the Gambling Commission register: Eaton Gate Gaming Limited account 44448.
That is what connects GRP Casino with Kwiff and SlotsKing.
Do GRP Casino, Kwiff and SlotsKing Share One Account?
Do not assume that they do.
Even when multiple brands share the same UKGC operator, individual websites can maintain separate:
- registrations
- balances
- promotions
- bonus terms
- payment methods
- game selections
- responsible gambling settings
The sister-site connection tells us who sits behind the regulated operation. It does not mean the three sites function as one combined customer account.
GRP Casino Sister Sites FAQs
What are the current GRP Casino sister sites?
The current same-licence sister brands are Kwiff and SlotsKing. All three brands appear under Eaton Gate Gaming Limited’s UKGC account 44448.
Who operates GRP Casino?
GRP Casino operates under Eaton Gate Gaming Limited’s UK gambling licence, with Kwiff Limited identified as the named operating agent.
Is Kwiff a GRP Casino sister site?
Yes. Kwiff and GRP Casino are both active under Eaton Gate Gaming Limited.
Is SlotsKing connected to GRP Casino?
Yes. SlotsKing is currently listed as an active domain on the same Eaton Gate Gaming UKGC account as GRP Casino.
Which GRP Casino sister is most similar?
SlotsKing is the closest casino-focused sister. Kwiff is more heavily focused on sports betting, although it also offers casino products.
Why do some sites list only Kwiff?
Many GRP Casino sister-site articles were written before SlotsKing appeared in the current Eaton Gate Gaming network, so those lists can now be outdated.
Current GRP Casino Network
GRP Casino has a small but clearly verifiable sister-site network.
The current answer is:
GRP Casino → Kwiff + SlotsKing
Kwiff is the more established betting brand, while SlotsKing is the closer casino-focused alternative.
For current sister-site research, the UKGC Eaton Gate Gaming record is the strongest source because it shows the brands that are actually active under the licence now.
