Kwiff Sister Sites: Eaton Gate’s Tiny Betting and Casino Family
Kwiff’s sister sites are GRP Casino and Slots King, both tied to Eaton Gate Gaming Limited’s Gambling Commission account 44448, while Kwiff Casino and Betkwiff are better understood as product wings of the same Kwiff brand family.
Kwiff Sister Sites
Reviewed by Mike Wilson
Published: May 2020
Operator details last reviewed: June 2026 (last updated 1 June 2026)
A quick wording note: Kwiff’s own corporate pages talk mostly about Kwiff, Betkwiff, Kwiff Casino and Betkwiff Casino. That is the brand family. This page uses the normal UK search meaning of a sister site: a separate gambling brand connected through the same operator, agent setup, or Gambling Commission account. Under that definition, the useful names are GRP Casino and Slots King. Kwiff Casino is part of the same product family, but it is not really a separate casino choice in the way GRP Casino is.
For people comparing Eaton Gate brands at a Glance, the first thing to know is that Eaton Gate Gaming Limited doesn’t run a huge network. That is actually helpful. There are only a couple of meaningful places to compare, and neither should be confused with the unrelated bookies that older affiliate pages sometimes list.
- Best overall casino comparison: GRP Casino, because it keeps the same UKGC licence link while staying fully in casino territory.
- Best for sports betting: Kwiff itself, because the Supercharge mechanic is the whole point of the brand.
- Best simple slots move: Slots King, if you want an Eaton Gate casino built around a cleaner slots pitch.
- Best for a newer casino feel: GRP Casino, thanks to the gold-rush branding and its newer casino-led layout.
- Best if you hate network clutter: the Eaton Gate group as a whole, because the list is short enough to understand in one sitting.
Related Brands Compared
| Sister site | Status | UKGC licence | Best for | Welcome offer, always check | Compared to Kwiff |
|---|---|---|---|---|---|
| GRP Casino | Active casino brand on the Eaton Gate Gaming Limited licence | UKGC account 44448 | Players who want casino rather than sportsbook | Promotions can vary, so check the live offer page before depositing | Much more casino-focused, without Kwiff’s sports betting personality |
| Slots King | Active domain listed on the same UKGC account | UKGC account 44448 | Straightforward slots play | Reported as up to 200 Big Bass Bonanza free spins after daily slot spend | Leaner and more casino-only, but less recognisable than Kwiff |
| Kwiff Casino | Product wing of the Kwiff brand | UKGC account 44448 through Eaton Gate Gaming Limited | Kwiff users who want slots and live casino inside the same brand universe | Wager £20 on slots within 5 days to receive 200 Book of Dead free spins, £250 winnings cap | Same brand family rather than a clean separate sister site |
GRP Casino
GRP Casino is the cleanest casino comparison in the Eaton Gate Gaming Limited family. It appears on the same Gambling Commission account as Kwiff, and its public app listing describes it as a UK-licensed casino brand inspired by a Wild West gold-rush theme. The useful difference is obvious: Kwiff starts from sports betting and then adds casino, while GRP Casino starts with slots, live tables and a more conventional casino lobby.
The payments picture is also more casino-like. Public material for GRP Casino points to Visa Debit, Mastercard Debit, Payz and bank transfer, with £10 minimums and typical withdrawal windows ranging from same-day e-wallet payouts to 1 to 3 banking days for bank transfers. The game mix is built around familiar providers such as NetEnt, Play’n GO, Playtech, Evolution, Booming Games and Red Tiger. Versus Kwiff: GRP Casino is the better pick if you want the same operator umbrella without the sportsbook taking over the identity.
Slots King
Slots King is the other useful Eaton Gate Gaming name because slotsking.com is listed as an active domain on the same Gambling Commission account. It is not a legacy bookie, a Flutter brand, or one of the old unrelated names that used to appear on this page. The clue is in the name: it is aimed at players who want slots first and don’t need the football, racing and odds-boosting personality that makes Kwiff feel different.
The welcome offer needs careful reading. The useful current shape is up to 200 Big Bass Bonanza free spins, but the full headline has been tied to repeated £20 slot spend across several days rather than one simple deposit. That makes it less generous than it first looks. Versus Kwiff: Slots King is narrower, quieter and more literal. I’d treat it as a simple casino offshoot rather than a better all-round betting site.
Kwiff Casino and Betkwiff
Kwiff Casino, Betkwiff, and Betkwiff Casino sit closer to the official Kwiff brand family than to a separate sister-site list. Kwiff’s own casino offer currently advertises 200 free spins on Book of Dead after a new player wagers £20 in cash on slots within 5 days of first deposit. The spins are worth 10p each, the winnings have no wagering requirement, and the maximum cashout from the free spins is £250. E-wallet and virtual card deposits are excluded from that casino welcome route.
This is where Kwiff is strongest from a casino point of view. The official casino promo page advertises 4,600+ slot games, 150+ table games and 800+ live casino games. That gives Kwiff more depth than the brand’s sportsbook-first reputation might suggest. Versus GRP Casino and Slots King: Kwiff has more personality and a better-known name, but it also brings more sportsbook clutter if all you want is casino play.
The Complete Eaton Gate Gaming Limited Sister Sites List
The Gambling Commission register for Eaton Gate Gaming Limited, account 44448, lists seven active domain entries. For players, some of those are useful brand choices and some are just app links or Kwiff domain variants. That distinction matters more than the raw count.
| Group | Names worth knowing | What it means for players |
|---|---|---|
| Core UK brand family | Kwiff, Kwiff Casino, Betkwiff | Same brand universe, with sports betting, casino and app-led product routes |
| Separate same-operator casino choices | GRP Casino and Slots King | The two names that matter most if you want a different casino under the same British licence picture |
| White-label position | No big third-party white-label network is visible from the UKGC entry | This is not a Jumpman, White Hat or ProgressPlay style network with dozens of skins |
| Register noise | App store links and duplicate Kwiff domains | Helpful for verification, but not useful as separate casino recommendations |
Older lists that put QuinnBet, Betfair, Fitzdares or other established betting brands beside Kwiff are using a loose “similar sites” logic rather than the operator-and-licence meaning used here. They may be alternatives for sports bettors, but they are not Eaton Gate Gaming Limited brands.
What’s the Same and What’s Different
| Feature | Kwiff | Related Eaton Gate brands |
|---|---|---|
| Operator | Eaton Gate Gaming Limited, with Kwiff Ltd named as agent | Same UKGC account for GRP Casino and Slots King |
| UKGC licence | Account 44448, remote casino and betting permissions | Same account for the active related casino domains |
| Signature idea | Supercharged sports bets and a casino offer inside the same brand world | GRP Casino is casino-first, Slots King is slots-first |
| Welcome bonus style | Sports free bets or Book of Dead spins, depending on the offer selected | More standard casino promotions, with daily free-spin mechanics on Slots King |
| Game library | Large casino lobby alongside sportsbook | Casino-only lobbies, less sportsbook distraction |
| Bingo | Not the main reason to join | Still not a bingo-led family |
| GamStop | Yes, covered through the UKGC licence | Yes, for the same UKGC-regulated account |
| Design feel | Mobile betting app energy, with casino bolted in well enough | GRP feels more like a modern casino, Slots King feels simpler and more literal |
Official Names, Same Operator and Lookalikes
There are three groups to keep separate. First, there is the official Kwiff family: Kwiff, Betkwiff and Kwiff Casino. Second, there are separate same-operator casino choices on the same British licence picture, mainly GRP Casino and Slots King. Third, there are unrelated alternatives that may look similar because they are also sportsbooks or casinos, but they are owned by different companies.
That last group is where the old version of this page went wrong. Betfair belongs to Flutter. QuinnBet and Fitzdares sit under different licence structures. Those names can be useful betting alternatives, but they should not be sold as true operator relatives of Kwiff.
Review of the Brand
Kwiff is a strange one in a good way. Most betting sites start with price, market depth or brand history. Kwiff starts with the idea that any bet might be “kwiffed”, meaning the odds can be boosted after you place it. That gives the site a recognisable hook, and it is still the main reason a sports bettor would remember the brand rather than lump it in with every other mid-sized UK bookmaker.
The downside is that the same quirk can make expectations messy. Some players love the Supercharge mechanic. Others complain that the best boosts don’t land on the bets they actually care about, or that the site is harder to navigate than more conventional bookies. I think both reactions are fair. Kwiff has character, but character doesn’t remove the need for clear markets, fast support and smooth withdrawals.
Welcome Offers and Promotions
Kwiff has separate welcome routes for sports and casino players. The sportsbook offer currently centres on a Bet £10 Get £40 free-bet deal for new UK customers. The qualifying bet needs to be placed with real money at minimum odds of 2.0 within 5 days of deposit, and the reward is split into four £10 free bets: one single, two accas and one Bet Builder. Those free bets expire after 7 days, so this is not a slow-burn offer you can park for later.
The casino welcome offer is clearer for slot players. Wager £20 cash on slots within 5 days of your first deposit and Kwiff advertises 200 free spins on Book of Dead. The spins are 10p each, winnings from the spins have no wagering requirement, and the total cashout from free-spin winnings is capped at £250. The catch is that e-wallets and virtual cards are excluded from that casino offer, so payment method matters before you join.
Games, Sports Betting and Providers
The casino side is bigger than many people expect from a sportsbook-led brand. Kwiff’s own casino promotion page advertises 4,600+ slot games, 150+ table games and 800+ live casino games. The provider mix includes names players will recognise, including Pragmatic Play, Play’n GO, Hacksaw Gaming, Nolimit City, NetEnt, Relax Gaming and Evolution. That is a strong enough lobby for a casual casino player, even if the brand’s personality still leans towards sports.
Sports betting remains the centre of gravity. Football is the natural fit, with bet builders, acca features, trending bets and the Supercharge mechanic doing a lot of the work. The older criticism still stands, though: Kwiff can feel thinner outside the obvious sports and big football markets. If you want enormous market depth, live streaming and horse-racing extras such as best odds guaranteed, it may not be the most complete bookie.
Payments, Withdrawals and KYC
Kwiff’s payment menu is practical rather than exciting. Debit cards, PayPal, Skrill, Neteller, Trustly, Paysafecard, Apple Pay and Payz have all appeared in current payment coverage, but the live cashier is always the final word because payment availability can change by account, device and offer. The casino bonus has one particularly important restriction: e-wallet and virtual card deposits do not qualify for the 200 free spins route.
Withdrawal performance looks mixed but not disastrous. Independent tests and payment guides point to Kwiff approving many withdrawals within about 24 hours, with actual arrival depending on the payment method. Card withdrawals can take longer than e-wallets, and bank transfer can run to a few banking days. Player complaints show the real friction is often not the payment rail itself, but verification, failed withdrawals, account checks or disputes about whether an offer applied correctly.
Because this is a UKGC-licensed operator, KYC is not optional. Kwiff may ask for identity, address, payment ownership, affordability or source-of-funds evidence when the account pattern calls for it. That is normal in Britain, but the experience can still annoy players if the request appears at withdrawal stage rather than sign-up.
Support, Complaints and Safer Gambling
Support is available through live chat in the app and by email at help@kwiff.com. I could not find a public customer support phone number. That matters because Kwiff’s likely dispute points are practical ones: verification, withdrawal timing, Supercharge expectations, missing promotions, offer qualification and account closure.
Kwiff’s published complaints procedure says complaints should be sent through the helpdesk route or by email, and that unresolved gambling-transaction disputes can be escalated to eCOGRA as the Alternative Dispute Resolution body after the internal process has finished. It also says complaints need to be raised within 6 months of the incident and that the operator aims to resolve cases within 8 weeks once it has the relevant information.
Safer gambling tools are what you would expect from a British-licensed operator: deposit limits, time-outs, self-exclusion routes and GamStop coverage. The Gambling Commission register currently shows 0 regulatory actions for Eaton Gate Gaming Limited, but Kwiff has had Advertising Standards Authority rulings against it, including a 2025 upheld ruling over gambling marketing featuring a person judged to have strong appeal to under-18s. That does not make the site unsafe to use, but it is a fair mark against the brand’s marketing judgement.
GamStop · GamCare · BeGambleAware
Mobile Experience
Kwiff makes most sense on mobile. The betting product was built with app use in mind, and the Gambling Commission register even lists the iOS and Android app links alongside the web domains. The site is quick enough, the sports offer is easy to understand once you know the layout, and the casino can be reached without feeling like a completely separate product.
The criticism is that Kwiff’s navigation can still feel jumpier than bigger, plainer brands. Trustpilot reviews contain plenty of praise for Supercharge and fast payouts, but also complaints about laggy design, limited markets and verification. I would not call the app difficult, but it does ask you to buy into Kwiff’s own way of doing things.
Key Facts
Operator details last reviewed: June 2026 (last updated 1 June 2026)
| Operator | Eaton Gate Gaming Limited |
| Agent named on licence | Kwiff Ltd |
| Parent company or group | Eaton Gate Gaming Limited, active private limited company incorporated on 7 April 2015 |
| Platform or network | Small Eaton Gate Gaming Limited brand family, not a large white-label network |
| Licence | UKGC account 44448, Remote Operating Licence 044448-R-323408-017 |
| Established | Kwiff launched in 2015, Eaton Gate Gaming Limited incorporated in 2015 |
| GamStop | Yes, covered through the UKGC licence |
| Useful related casino brands | GRP Casino and Slots King |
| Game providers | Pragmatic Play, Play’n GO, Hacksaw Gaming, Nolimit City, NetEnt, Relax Gaming, Evolution and others |
| Payments | Debit cards, PayPal, Skrill, Neteller, Trustly, Paysafecard, Apple Pay and Payz may appear in the cashier |
| Minimum deposit | £10 is the key welcome-offer deposit and staking reference |
| Withdrawal time | Often around 24 hours for approval, then same day to 3 banking days depending on method and checks |
| Support | Live chat in app and email at help@kwiff.com. No public phone number found |
| ADR | eCOGRA for unresolved gambling transaction disputes |
| Our rating | 7/10 |
Pros and Cons
| What works well | What needs caution |
|---|---|
| The Supercharge idea gives Kwiff a real identity in a crowded UK sportsbook market. | The same Supercharge mechanic can frustrate players if the boosts feel random rather than useful. |
| The casino lobby is deeper than the sportsbook-first branding suggests, with thousands of slots and a large live casino section. | The casino welcome offer excludes e-wallets and virtual cards, so the payment method can decide whether the offer applies. |
| Eaton Gate Gaming Limited is easy to verify on the Gambling Commission register, which keeps the ownership picture clean. | There are only two useful related casino brands, so this is not a deep network for bonus-hopping. |
| GRP Casino gives casino players a clearer same-operator alternative than the old unrelated names on this page. | Trustpilot praise is mixed with repeated complaints about verification, laggy design and withdrawal friction. |
| The free-spin winnings having no wagering requirement is a plus, even with the £250 winnings cap. | No public customer support phone number is offered, which makes escalations feel more remote. |
Our Verdict
Kwiff earns a 7/10 from me. It is licensed, memorable, more substantial on casino games than its betting-first branding suggests, and backed by a small operator family that is easy to verify. I like the fact that the related-brand picture is simple once the false names are removed.
The best Kwiff sister sites answer depends on what you are trying to replace. If you want another casino, GRP Casino is the sensible pick because it keeps you inside the same Eaton Gate Gaming Limited licence picture without making sports betting the main event. If you want a simpler slots-only spin on the group, Slots King is worth comparing, but I’d be slower to call it the stronger all-round choice. Kwiff itself remains the flagship because its personality is built around a betting idea that the others don’t have.
New Sister Site rating: 7/10.
FAQs
Does Kwiff have sister sites?
Yes. The useful same-operator names are GRP Casino and Slots King. Kwiff Casino and Betkwiff are part of the wider Kwiff brand family, but they are better treated as product wings rather than completely separate casino destinations.
Who owns Kwiff?
Kwiff is run under Eaton Gate Gaming Limited’s Gambling Commission account 44448, with Kwiff Ltd named as agent on the licence. Eaton Gate Gaming Limited is an active company incorporated in England and Wales.
Is GRP Casino a Kwiff sister site?
Yes. GRP Casino is listed on the same Eaton Gate Gaming Limited Gambling Commission account and is the closest casino-led comparison. It is the name I would look at first if you want a casino rather than Kwiff’s sportsbook-led product.
Is Slots King a Kwiff sister site?
Yes, slotsking.com appears as an active domain on the same Gambling Commission account. It is a narrower casino comparison than GRP Casino, with a more obvious slots-first pitch.
Are Betkwiff and the main brand connected?
Yes. Betkwiff is part of the same official brand family, but I would not treat it as a separate sister site in the same way as GRP Casino or Slots King. The useful distinction is brand-family route versus separate related casino.
Are QuinnBet, Betfair and Fitzdares related to Kwiff?
No. Those names appeared on the old version of this page, but they are not Eaton Gate Gaming Limited brands. They may be sports betting alternatives, but they should not be described as true operator relatives of Kwiff.
Are the related brands on GamStop?
Yes. Brands operating under the Eaton Gate Gaming Limited UKGC account are covered by the British safer-gambling framework, including GamStop self-exclusion. That is one reason the UKGC licence link matters.
What is the best related casino if I mainly play slots?
GRP Casino is my first choice because it is a proper casino comparison with a wider provider mix. Slots King is more narrowly slot-led, so it may suit players who want something simpler, but I would check its offer mechanics carefully before depositing.
What casinos are run by Eaton Gate Gaming Limited?
The useful active casino names are Kwiff Casino, GRP Casino and Slots King, with Kwiff itself as the sportsbook-led flagship. The UKGC register also lists app links and Kwiff domain variants, which are verification details rather than extra casino recommendations.
Are there new casinos like Kwiff?
There are newer UKGC-licensed casinos with app-led design and free-spin offers, but they are not necessarily related to Kwiff. If the operator link matters, stick with GRP Casino and Slots King. If you only want alternatives, compare licence holder, GamStop coverage, withdrawal rules and bonus restrictions before joining.