About Us
Online Casinos is a UK-facing comparison site built around one question: which casino bonus is actually worth claiming, and what does it cost you to clear it? This page explains who puts the pages together, how the rankings on shelleye.org are decided, where the money comes from, and where our judgement stops and yours begins.
Why this site exists
Welcome offers are the noisiest part of the online casino market. A headline like 570% up to £5,700 tells you almost nothing on its own — the wagering multiple, the game weighting, the maximum bet while a bonus is live and the expiry window decide whether that number means anything. Our editorial focus is bonuses and free spins, so most of what we publish is an attempt to translate those headlines into terms a player can act on.
The wider site covers the things that sit around a bonus: payment options, software providers, mobile apps and licensing. This page covers us.
How we're funded, plainly
Online Casinos earns commission when a reader signs up with some of the brands listed here. That is how the site pays for itself, and we would rather say so at the top than bury it. Two things follow from it, and we hold to both:
- Commercial arrangements do not buy a position. Rank order comes from our editorial scoring, and a paying brand that scores poorly sits below one that scores well.
- Every brand we recommend gets at least one stated drawback, including the one at the top. A write-up with no downside is an advert, not a review.
We do not gamble with our own money to produce these pages. There is no "we deposited and withdrew" claim anywhere on shelleye.org, because it would not be true. What we do is research: reading terms and conditions, checking operator-published information, comparing what is advertised against what the small print allows, and re-checking when offers change.
Who writes it
Pages on this site are written and maintained by Emily Foster, with the content on this page verified as of 21 September 2026. Bonus terms move quickly — percentages change, spin counts change, and offers are withdrawn from the UK market entirely. Where a figure here has drifted since it was last checked, the operator's own terms page is the authority, not ours. If you spot something out of date, the contact page is the fastest way to tell us.
How we rate and rank a casino bonus
Every brand is scored on the same criteria, weighted towards what a bonus-led player actually experiences. Our ratings are editorial opinions produced by this team. They are not customer-satisfaction scores, not an average of user reviews, and not a prediction that you will win.
- Bonus value after conditions. Not the headline figure — the realistic value once wagering, maximum bet caps and expiry are applied.
- Clarity of terms. Whether the important restrictions are findable before you deposit or hidden three clicks deep.
- Free spins quality. Spin value, which games they're locked to, and whether winnings from spins carry their own wagering.
- Game range and providers. Whether the slots, table games and live-dealer rooms behind the bonus are worth playing at all.
- Banking practicality. Deposit and withdrawal methods that suit UK players, and whether any method is excluded from the welcome offer.
- Mobile experience. Whether the bonus journey works on a phone, since that is where most play happens.
- Player protection. Deposit limits, time-outs, self-exclusion tools and how visible they are.
Three brands, and what our process produced
These are worked examples of the scoring above rather than a full ranking — the ranked cards on our comparison pages carry the complete list.
Betmica — top of our table on bonus scale
Betmica leads our list, with an editorial rating of 10.0, largely because the welcome structure is the most substantial we cover: a 570% match up to £5,700 plus 270 free spins. For a player who deliberately wants a long bonus runway rather than a quick cash-out, the sheer size of the package is the differentiator, and the spins are spread across the offer rather than dumped in one day.
Conditions to read first: the match is for new accounts, requires a qualifying deposit, and the advertised maximum is the ceiling across the package, not a single deposit. Wagering requirements, maximum stake per spin while the bonus is active and the expiry window all apply — check them on the operator's terms before depositing.
Limitation: a percentage this large is only reachable with substantial deposits, so the headline figure is irrelevant to most casual players. If you deposit £20, judge it on the spins and the lower tier of the match, not the £5,700.
Kikibet — a more reachable middle ground
Kikibet sits at 9.9 and earns its place for players who find Betmica's structure over-engineered. The offer is 350% up to £5,555 with 300 free spins, and the spin count is the highest of the three here relative to the match size, which suits anyone whose main interest is slot sessions rather than clearing a large cash bonus.
Conditions to read first: new customers only, minimum deposit applies, and spins are typically restricted to named games with their own playthrough on any winnings.
Limitation: a 350% match still carries the same trap as any high multiple — the wagering obligation scales with the bonus you accept, so taking the maximum can lock funds you would rather withdraw. Declining part of a match is sometimes the smarter play.
Betninja — the straightforward option
Betninja, also 9.9, is here precisely because it does not chase a four-figure percentage. The offer is £1,000 plus 100 free spins for all new players, and the simplicity is the point: a flat cap and a modest spin count are far easier to evaluate before you commit than a tiered package.
Conditions to read first: available to new players, subject to a qualifying deposit, wagering and time limits as published by the operator.
Limitation: bonus hunters will find the ceiling low next to Betmica or Kikibet, and 100 spins goes quickly at low spin values.
Side by side
| Brand | Headline welcome offer | Free spins | Our rating |
|---|---|---|---|
| Betmica | 570% up to £5,700 | 270 | 10.0 |
| Kikibet | 350% up to £5,555 | 300 | 9.9 |
| Betninja | £1,000 bonus | 100 | 9.9 |
| WinnerIsland | Up to €1,000 | 100 | 9.9 |
| Zombillion | 250% up to £4,000 | 200 | 9.9 |
| Smash Casino | 600% up to €10,000 slots package | Not stated | 9.8 |
| Rivo | 1000% up to €10,000 + 25% cashback | Not stated | 9.6 |
| Daytonaspin | 255% up to £4,500 | 255 | 9.6 |
All offers are for new players and carry wagering and other conditions. Where an offer is quoted in euros, the amount you can claim will convert at the operator's rate and may not be a round figure in GBP.
What "the cost of taking part" means to us
There is no charge for using Online Casinos. The cost sits with the play itself, and we try to keep three things visible on every page rather than in a footnote:
- The qualifying deposit. A bonus you must deposit to receive is not free money, and we never describe it that way. Free spins issued with no deposit are the only genuinely no-cost offers, and they are rare and small.
- Wagering. The multiple applied to your bonus, and sometimes your deposit too, before a withdrawal is possible.
- Payment friction. Debit cards are the standard route for UK players; e-wallets and bank transfer are widely offered, with timings and any fees set by the operator and your provider. Some welcome bonuses exclude certain deposit methods altogether, and credit cards cannot be used for gambling in Great Britain. Withdrawal times vary by method and are subject to identity checks, so treat any advertised speed as the operator's claim rather than a tested result.
The ground we cover beyond bonuses
Our reviews look at the whole product, because a generous offer attached to a thin games library is a bad deal. In practice that means slots, from classic three-reel titles to modern video slots and jackpot games; table games such as roulette, blackjack, baccarat and casino poker; live-dealer rooms streamed with real croupiers, where bonus wagering usually contributes at a much lower rate or not at all; and the game-show style formats that now sit alongside them. We also note which studios supply the games, since provider line-up is a reasonable proxy for how seriously an operator takes its catalogue.
Most of the brands we list run other product lines beside the casino. Sportsbooks are the common one, with football, horse racing and in-play markets, and they usually operate a separate bonus wallet with different terms. Some also offer virtual sports, bingo or dedicated poker rooms — CoinPoker, for instance, is a poker-led brand rather than a slots-led one, and its 150% up to $2,000 offer is built around rake rather than spins, which is a different proposition entirely. Sports free bets and casino bonuses rarely cross over, so read each on its own terms.
Regulation, eligibility and what we won't claim
Online gambling in Great Britain is regulated by the Gambling Commission under the Gambling Act 2005. You must be 18 or over to gamble, and licensed operators are required to verify your age and identity before you play and before you withdraw. Licensed sites must also offer deposit limits, reality checks, time-outs and self-exclusion, and participate in GAMSTOP.
We do not state the licensing status of any individual brand on this page. Licensing can change, and a claim of that kind belongs on the operator's own site where it is legally binding. Before you register anywhere — including a brand you found here — check the licence details in the site footer yourself and confirm they match the operator named in the terms. If you are researching sites outside the GAMSTOP scheme, our page on casinos not registered with GAMSTOP sets out what that means in practice and what protections differ.
Gambling should be entertainment paid for out of money you can afford to lose. If it stops feeling that way, our responsible gambling resources list the tools and free support services available in the UK. Our full terms of use cover how this site may and may not be relied upon.
Playing online rather than in a venue
We're upfront that we think the online format suits most modern players. You can compare welcome offers across a dozen sites in an evening, something no high street venue lets you do. Stakes start far lower, demo play is available on most slots, and the game range is not limited by floor space. The player-protection tools are built into the account rather than requiring a conversation with staff — deposit caps, session reminders and self-exclusion are a couple of taps away. And your play history is logged, so you can see exactly what you have spent, which is genuinely difficult to track with cash at a table.
Our limits — and how to use this site well
We research; we do not guarantee. Nothing here predicts an outcome, and no rating suggests a brand will pay you. Offers change without notice, regional restrictions apply, and an operator's own terms always override our summary. Use our pages to shortlist, then spend five minutes on the bonus terms of the site you have chosen before you deposit a penny.
If something on shelleye.org looks wrong, or you have had an experience with a listed brand that our review does not reflect, tell us. Reader corrections are one of the few things that keep a comparison site honest.