Kwiff Sister Sites UK: Full List, Verified on the UKGC Register

Kwiff Sister Sites at a Glance

Kwiff is a sportsbook first, famous for randomly “supercharging” your odds, with a casino built in and a purple, app-led look.

GRP Casino is casino-only. Its full name is Gold Rush Play, and the branding is pure western gold rush: orange skies, a cowboy, nuggets in a suitcase.

SlotsKing is the newest of the three and the simplest: slots up front, a crown in the logo, has what it needs and not much else. 

I took a good look at both sister sites so let me tell you what they offer. GRP Casino runs slots, jackpots, live casino and table games. Its official App Store listing claims 4,000+ games – can’t manually verify the actual number but I’ve seen lots of fan favourites.

SlotsKing is so new I couldn’t verify its game count yet. Not a red flag per se on a licensed site, but a reason to start small. Its domain sat inactive on the UKGC register for months, so older articles still call it dead, or miss it completely. That changed recently. 

When I loaded slotsking.com in July 2026, it was fully live, with its own branding and its own welcome offer, and the register showed both grpcasino.com and slotsking.com as active under licence 44448 on the same day.

About Safety

Self-exclusion through GamStop blocks all three sites at once, because they are all UKGC-licensed. But each brand has its own account and its own login. So if you only use one site’s own self-exclusion tools – say, you close your Kwiff account from inside the app – GRP Casino and SlotsKing stay open to you. For a full stop across this entire family of casinos, use GamStop. And if you feel like gambling stops being fun and you want to stop entirely, GambleAware and GamCare offer free confidential help.

Who Owns Kwiff? 

Kwiff casino is owned by Eaton Gate Gaming Limited (UKGC licence 44448), founded in 2015. It ran Kwiff as its only brand for years before adding its two sister casinos. Day to day, the sites are operated by Kwiff Limited, a Malta-registered company named in the terms of Kwiff, GRP Casino and SlotsKing alike. A separate entity, Worldwide Gaming Limited (Isle of Man), serves players outside the UK and Ireland.

Operator	Eaton Gate Gaming Limited
UKGC licence number	44448
Founded	2015
Other brands under this licence (active)	GRP Casino (grpcasino.com), SlotsKing (slotsking.com)

Kwiff vs Its Sister Sites

Site name	Relationship type	Owner	Welcome offer
GRP Casino	Direct sister site, active	Eaton Gate Gaming Ltd / Kwiff Ltd	Stake £20 on slots in a day, get 40 wager-free spins on Big Bass Splash, up to 200 over 5 days
SlotsKing	Direct sister site, active	Eaton Gate Gaming Ltd / Kwiff Ltd	Stake £20 on slots in a day, get 40 wager-free spins on Big Bass Bonanza, up to 200 over 5 days

Both offers confirmed live on 23 July 2026 on each site’s own homepage and terms.

All three brands advertise wager-free spins at 10p each, capped at £250 in winnings. On paper, the Kwiff casino sister sites look identical to Kwiff itself. But the cost is not identical. 

At Kwiff, you wager £20 on slots once, any time in your first five days after the first deposit, and all 200 spins on Book of Dead land about 24 hours later.

At GRP Casino and SlotsKing, £20 staked in a day earns 40 spins for that day. To collect the full 200, you repeat it on five days, so it’s £100 wagered in total. Miss a day and you can still qualify the next. There’s just no way to unlock everything with a single £20.

Two family rules apply everywhere: crash, table and live casino games never count as qualifying play, and every site needs its own registration, so no shared wallet and no shared login.

So which casino should you start with? Well, sports betting exists only at Kwiff. The biggest casino-only library is GRP’s. SlotsKing makes sense if you want its Big Bass Bonanza spins and don’t mind being an early customer.

Pros and Cons of Kwiff

I made a quick recap of the good and the bad based on my own experience with Kwiff – you can read more in our full Kwiff review.

Best Casino Sites Like Kwiff (Beyond the Kwiff Sister Sites)

Everything below is not a sister site. These five casinos belong to different companies, on different UKGC licences, and none of them shares Kwiff’s platform. Kwiff built its own technology, so no other UK casino runs on it. 

What they do share is the feel: the same major game studios you’ll find at Kwiff (Pragmatic Play, Play’n GO, NetEnt, Evolution, Playtech) or the same kind of welcome deal, where spins come with no wagering strings attached. All five come from the casinos we work with and review at Gamble Mind.

Casino	Total games	Withdrawal speed	Bonus
Betfred	1,500+	1–3 days	Deposit & wager £10, get up to 200 wager-free spins
Midnite	2,775	Instant–5 days	Deposit & wager £20, get 100 wager-free spins on Big Bass Splash
PlayOJO	8,000+	Up to 12 hours	Deposit £10, get 80 wager-free spins on Big Bass Bonanza
7bet	2,300+	About 1 hour (tested)	Deposit & wager £20, get 100 Bonus Spins on Big Bass Splash (1x wagering)
All British Casino	2,600+	Instant–24h	Deposit & wager £10, get 100 wager-free spins on Le Bandit + always 10% cashback

Betfred

Best for: jackpot hunters who want Kwiff’s kind of deal at half the stake.

Betfred has been taking bets since 2005 under Petfre (Gibraltar) Limited. With Betfred we’ve got 1,500+ selected games, quick payouts, and a strong Playtech line-up. Its welcome spins run on Age of the Gods, Playtech’s own jackpot series, the same premium-jackpot territory Kwiff plays in.

The welcome deal mirrors Kwiff’s at half the stake: deposit and wager £10 on slots, then pick your spins – 200 at 5p, 100 at 10p, or 50 at 20p – all wager-free, credited within 48 hours. Debit cards only.

Midnite

Best for: bettors who want something similar to Kwiff’s sports and slots mix.

Midnite, run by Dribble Media, feels the most like Kwiff of anything here: launched in 2023, app-first, sport and casino in one clean account. The library has around 2,700 games, and the minimum deposit is just £5. 

Wager £20 within 14 days of signing up and 100 wager-free spins on Big Bass Splash are yours. Withdrawals run from instant to five days depending on the method.

PlayOJO

Best for: players who want Kwiff’s wager-free rule applied to everything, at scale.

PlayOJO, a Skill On Net brand running since 2017, made no-wagering its whole identity long before it was fashionable. Deposit £10 and 80 wager-free spins on Big Bass Bonanza arrive. You need no promo code, and the terms list no expiry and no win cap. 

It’s the giant of this table: 8,000+ games and withdrawals within 12 hours. Their welcome offer is a selected-player deal, so claim it through our link or you won’t be eligible.

7bet

Best for: players who want Kwiff’s offer shape with proper e-wallet support.

7bet, an Anakatech brand, runs the same routine as Kwiff: one account for sport and casino, deposit £20, wager £20, collect 100 spins on Big Bass Splash. The spins carry a light 1x wagering, winnings cap at £100, and you’ll need code WELCOME100. 

In exchange you get something Kwiff doesn’t offer: Google Pay, PayPal, Trustly, Skrill and Neteller at the cashier. Around 2,300 games, super fast payouts (we tested it, just 50 minutes using a debit card).

All British Casino

Best for: players who care more about the long run than a first week deal.

All British Casino, run by L&L Europe since 2013, pairs its welcome deal with something rare: cashback that never ends. Deposit and wager £10 for 100 wager-free spins on Le Bandit – the spins expire in 48 hours, so use them fast – then you can collect 10% back on losses for as long as you play there.
These five casinos work in a similar way to Kwiff. The opposite path is our verified list of casinos with no sister sites, and every network we’ve mapped lives in our sister sites hub.