How casino apps are tested

How casino apps are tested in the UK: the short answer

A UK casino app is checked by several different bodies, each looking at a different part. No single certificate covers the whole thing. The table below shows who checks what.

The point of all this is that results are fair and match the published rules, that your money and data are protected, and that the app behaves as the licence requires. None of it changes the fact that casino games have a built-in house edge, so losing over time is the expected outcome.

RNG and game testing by approved test houses

Every slot, table game and instant-win game offered to UK players runs on a random number generator (RNG). The Gambling Commission's remote technical standards include a section on the generation of random outcomes, and games must be tested by an independent test house before they're released in Great Britain. The Commission publishes a list of test houses it accepts; well-known names in the field include GLI, BMM Testlabs, eCOGRA and iTech Labs.

Testing typically covers:

• Randomness. Statistical tests over very large samples of outputs to confirm the RNG isn't predictable or biased.
• Mapping. That random numbers are turned into reel positions, cards or wheel pockets correctly, so each outcome has the probability the maths says it should.
• Game rules. That the game pays exactly as its paytable and rules describe, including features and bonus rounds.
• Display. That what the player sees matches the result recorded on the server.

Once a game is certified, changes to it need to go back through testing. The RNG runs on the game provider's server, not on your phone, which is one reason the same game behaves identically in an app, a browser or on a desktop. Our explainer on how casino app games work follows a single spin from tap to result.

How RTP figures are checked

Return to player (RTP) is a theoretical figure: the share of all money staked that a game is designed to pay back over a very large number of plays. Test houses verify it by examining the game's maths and running simulations of millions of rounds to confirm the result lands where the developer says.

Many slots are built with several RTP settings, for example a default version and one or two lower ones, and the casino chooses which to run. Each version is tested. The figure that applies to you is shown in the game's own help or information screen, which is why that screen is the place to check, rather than a review site or the developer's marketing. Our guide to finding a slot's RTP in an app shows where it is, and the RTP range entry explains multiple versions.

A 96% RTP doesn't mean you'll get £96 back from £100. Over a single session, results swing widely, and most sessions end below the starting balance. The figure describes the game's long-run maths, not your evening.

The Gambling Commission standards a casino app must meet

The Gambling Commission's Remote Gambling and Software Technical Standards (often shortened to RTS) set out what gambling software must do. They're numbered requirements covering things you see in every app, alongside separate security requirements. Together with the slot design rules introduced in 2021 and extended in 2025, they shape a lot of the mobile experience.

A summary of the wider rulebook is in UK casino app rules, which also covers stake limits and the 2026 wagering cap.

Security audits, encryption and protecting your account

Alongside game testing, the Gambling Commission's technical standards include security requirements for the systems that handle player data, payments and game records. Operators must have those systems audited regularly by a qualified independent auditor, against requirements based on the international ISO/IEC 27001 information security standard. The audit looks at things like access control, network security, encryption, change management and incident handling.

From your side, the visible parts of this are encrypted connections (every licensed app uses them), account security features such as two-factor authentication where offered, biometric login, and verification checks before withdrawals. The casino app security page covers what you can do to keep your own account safe.

Apple and Google review before an app reaches the store

Before a real-money casino app appears in the UK App Store or Google Play, it goes through the store's own review. That isn't game testing; it's a check that the app is allowed, honest about what it does and built to the store's rules.

• Apple. The App Store Review Guidelines allow real-money gambling apps only from operators with the necessary licences, restricted to the places where they're licensed, and free to download. Real-money deposits can't be sold through Apple's in-app purchase system.
• Google Play. Real-money gambling apps are allowed in Great Britain only from licensed operators who apply and are approved by Google. The app must be restricted to approved countries and to adults, and it can't use Google Play billing for gambling payments.
• Both stores. Gambling apps carry an adult age rating (18+ on the App Store, PEGI 18 on Google Play for our partner apps) and must disclose data practices in privacy labels or data safety sections.

Our guides to Apple App Store gambling rules and Google Play gambling rules go into each store's policy in more depth. Updates go through review too, which is partly why a new version sometimes appears on one platform a little before the other.

The operator's own testing: devices, versions and updates

The external checks above don't cover whether the app crashes on a particular phone, whether the cashier works on an older version of iOS, or whether a menu is confusing. That's down to the operator's own development and quality teams. Their processes aren't public, but common practice across app development includes testing on a range of real devices and simulators, automated tests that run with every code change, internal beta builds, and gradual rollouts that release an update to a small share of users first.

The store listing tells you the minimum operating system the developer supports. For our partners, the App Store listings checked in October 2026 showed iOS 18 or later for Coral and Ladbrokes, iOS 16 or later for 10bet, and iOS 15 or later for PlayOJO and Casumo. Google Play doesn't show the minimum Android version on the web listing; your phone's Play Store tells you whether the app is compatible. If an app stops working on an older phone, our guide to casino apps on older phones explains the options.

How live casino studios are checked

Live dealer games use real wheels, cards and dealers rather than an RNG, so they're checked differently. The Commission's standards include a section on live dealer studios, and studios supplying UK players need the appropriate licences. Typical controls include multiple cameras on every table, recordings kept for review, card shoe and wheel monitoring, procedures for shuffling and changing decks, and systems that read results automatically so the outcome recorded matches what happened on the table.

To see how those results and the video reach your phone, read how live casino streams work on mobile.

What 'tested' does and doesn't tell you

If you suspect a game malfunctioned, contact the operator first, then use its complaints process and, if needed, the independent dispute resolution service named in its terms. The stages are set out in how to complain about a casino app.

How to check a casino app yourself before you deposit

1. Find the operator's licence details in the app's footer or About section and check them on the Gambling Commission's public register. Our guide to checking a casino licence shows how.
2. On the App Store or Google Play listing, confirm that the developer or seller matches the licence holder or its group.
3. Open a game and tap its information or help icon to see the rules and the RTP for that version.
4. Read the app's privacy label or data safety section to see what data it collects.
5. Look at the safer gambling section and check deposit limits, reality checks and time-outs are available.
6. Read the terms for any offer before opting in, especially wagering, expiry and excluded payment methods.

If an app you've found isn't in the official stores, or asks you to install an APK file from a website, read how to spot fake casino apps before going further.

How review sites like ours assess casino apps

Many review sites say they 'test' apps. Best Casino Apps UK doesn't claim personal trials or deposits. Our pages are built from published, checkable sources: the Gambling Commission register, operators' terms and help centres, App Store and Google Play listings, and game developers' information. Where we can't verify a figure, we leave it out. The methods are set out in how we rate casino apps and our editorial policy.

That approach has limits, which we'd rather be clear about: published information can change, and we can't report how an app feels on every phone. That's why we point you to the store listing, the game's help screen and the app's cashier for the current details.

Licensed casino apps covered by UK testing rules

Ladbrokes and Coral are both licensed through LC International Limited (UKGC account 54743), and PlayOJO through Skill On Net Limited (account 39326). New Ladbrokes customers who deposit and spend £10 on slots get 50 free spins a day for their first 10 days, up to 500 spins at 10p each, claimed from the inbox before 23:59 each day, with no wagering. Coral's new-player offer is 100 free spins (10p each, selected games, valid 7 days, no wagering on winnings) after depositing and betting £10 on slots, with certain payment methods excluded. PlayOJO gives 80 free spins on Big Bass Bonanza at 10p each for a first deposit of £10 or more, with winnings paid in cash; new UK customers only, Northern Ireland excluded. All 18+, terms apply.

18+. Gambling should be entertainment that costs money, not a way to make it. Set a deposit limit before you play: how to set limits. Free, confidential help: National Gambling Helpline 0808 8020 133.