Casino testing labs: eCOGRA, GLI and more

What casino testing labs like eCOGRA and GLI actually do

A testing lab, which the Gambling Commission calls a test house, is a private company paid by game studios and casino operators to examine their software independently. It reviews random number generators, simulates game maths to confirm the return to player, checks that rules shown to players match the code, and produces a signed report. In Britain, that report is what allows a new game or RNG to be released, a process traced step by step in our guide to how casino games are tested.

The labs are not regulators. They cannot grant a casino its licence, fine one or settle your complaint about a payout (with one partial exception, covered below). Their job is narrower and technical: to give the Commission and the public a trustworthy, independent opinion that a piece of software does what it claims. The regulator’s technical standards (opens in a new tab) set the bar the labs test against.

This page is part of our UK casino guides. It describes the labs and the approval system as published by the Gambling Commission, checked on 20 October 2026; it does not rate or recommend any lab.

The Gambling Commission’s approved test houses list

Where the Commission’s testing strategy requires independent testing, licensees must appoint a lab from its published list. The current list states it shows test houses approved as of 2 March 2026; the page was last updated on 4 September 2026 with formatting changes only. Each entry shows whether the lab is approved for remote technical standards (online games), gaming machines and bingo or casino equipment.

Every entity on the list is approved for online testing, but only some cover physical gaming machines or table equipment. That is why eCOGRA, whose approval is online-only, appears so often in internet casino footers, while GLI’s many group companies show up across both online and land-based gambling.

eCOGRA: the online-only test house

eCOGRA Limited is approved by the Commission for remote technical standards only, with no gaming machine or equipment approval. In practice that makes it a specialist in internet gambling software: RNG certification, game testing and the audits that online operators need. Its “Safe and Fair” seal is a familiar sight in online casino footers.

eCOGRA wears a second hat in Britain. The Commission’s list of approved alternative dispute resolution providers (opens in a new tab) includes eCOGRA alongside IBAS, CEDR and others. If a casino names eCOGRA as its ADR body, you would take an unresolved complaint there after the operator’s own eight-week process. Testing and dispute work are separate services, so a casino can use eCOGRA for one, both or neither. Our guide to the complaints and ADR rules explains the route.

GLI: one name, six approved companies

Gaming Laboratories International appears six times on the approved list because several of its group companies, in the United States, Europe, Africa, India and the UK, are approved separately. Most GLI entities are approved for online games, gaming machines and bingo or casino equipment, which reflects a group that tests physical machines as well as software.

For a player, the practical meaning is simple: a GLI certificate on a slot tells you a GLI lab examined that version of the game. Which GLI entity did the work matters to the Commission (each test report must name the test house and its signing supervisor), but it should not matter to you, because all six are approved for online testing. GLI is also known for publishing technical standards used by regulators in other markets; in Britain, though, the yardstick is the Commission’s own RTS.

BMM, Eclipse and the smaller approved labs

The remaining approved names are less familiar to players but do the same regulated work. BMM has two approved entities, in South Africa and Spain, with the Spanish lab also approved for machines and equipment. Nick Farley & Associates trades as Eclipse Compliance Testing and holds approval across all three categories. Gaming Associates Europe, Global Lab, Quinel and RiskCherry are approved for online standards only.

Seeing a smaller lab’s name on a slot game’s help screen is no cause for concern if the casino is licensed: approval is the same pass mark whichever lab holds it. What would be a concern is a lab name that is not on the list at all, presented as if it satisfied British rules.

How a casino testing lab gets UK approval

The Commission’s guidance on applying for test house approval sets out a framework developed with the United Kingdom Accreditation Service (UKAS). Accreditation to ISO/IEC 17025, the international standard for testing laboratories, is mandatory, together with selected requirements from ISO/IEC 17065 (certification bodies) and ISO/IEC 27002 (information security controls).

1. The lab obtains ISO/IEC 17025 accreditation covering its gambling software testing.
2. It applies to the Commission, providing details of its identity and anyone owning 10% or more.
3. The Commission assesses its finances and financial independence, integrity (through external checks) and criminal records.
4. It reviews the competence of key people, from the chief executive to the heads of compliance, technical work, quality control and information security.
5. It checks policies on money laundering, data protection, business continuity and insurance.
6. If approved, the lab joins the published list; if refused, it is given reasons and can make further representations or reapply once issues are fixed.

Two details in that guidance protect players. Approved labs may not outsource testing to other test houses outside their own group, so the name on the report is the organisation that did the work. And there is no appeal against a refusal, only a fresh application once the problems are resolved.

What approved labs test, and what someone else checks

Approved labs handle game and RNG testing and the annual games testing audit. The separate annual security audit, which assesses the systems holding your data and generating random numbers against requirements based on ISO/IEC 27001:2022, does not have to be done by an approved test house. The Commission says it does not approve security audit firms; the licensee must confirm its auditor is reputable, suitably qualified and independent.

Keeping these roles apart explains a lot of confusing marketing. A site might truthfully say its games are certified by GLI while saying nothing about who audits its data security, or name eCOGRA as its ADR provider without using eCOGRA for testing at all.

Testing seals and badges: what they prove

Lab logos in a casino footer are marketing, not regulation. Nothing in the British rules requires a casino to display a testing badge, and an image can be copied by anyone. The thing that obliges a site to use approved labs is its Gambling Commission licence, so the licence is what you should verify. On a licensed site, many seals link to a certificate page on the lab’s own website; a seal that links nowhere, or to a page on the casino’s own domain, proves nothing by itself.

1. Find the licence statement in the casino footer and note the company name and account number.
2. Look that business up on the Gambling Commission public register (opens in a new tab) and confirm the remote casino licence is active.
3. Check the casino’s domain is listed against that business on the register.
4. If you want extra comfort, click the lab seal and confirm it opens a certificate on the lab’s own website naming the same operator.

If a site shows several lab seals but no Gambling Commission account number, treat that as a warning sign rather than reassurance. Our guide on how to spot a fake casino covers borrowed logos in more depth.

Do testing labs make games pay out more?

No. A lab certifies that a game’s measured behaviour matches its design; it does not set or improve the design. If a studio builds a slot with a 94% RTP, the lab confirms 94%, and the game will still keep an average of £6 from every £100 staked over its lifetime. A certified blackjack game still carries its house edge, and a certified roulette wheel still has its zero.

This is the point most often lost in casino marketing. “Independently tested” means the price of playing is honest and published, not that it is low. To compare that price between games, the house edge guide and the list of low house edge games are more useful than any badge. Whatever the RTP, the expected result for a player over time is a loss.

Testing labs and casinos outside the UK system

Many of the same labs certify games for regulators in other countries, so a lab’s name can appear on sites that hold no British licence. That does not bring the site inside the Gambling Commission’s rules. An offshore casino might use a certified game but run it without British protections such as the 10x wagering cap, GAMSTOP participation or the 2.5-second spin minimum, and it has no duty to keep a British games register.

The Commission’s July 2026 enforcement case against Evolution Malta Holding, which agreed to pay £4.75m after its games reached British players through unlicensed sites, shows the regulator treats the route to the player as seriously as the software itself. Our explainer on offshore casinos covers what you lose by playing outside the licensed market.

Common myths about casino testing labs

Another persistent myth is that a certified game can be “tightened” at busy times. RTS 7D bans changing a game’s settings while it is available for play, and every version must carry the digital signature recorded in its test report. The do slots pay more at night answer goes through it in detail.

Recent dated changes to testing and labs

We recheck the list when we review this page. If a lab you see on a casino site is missing from the list, check the date: approvals can change, and the Commission’s page is the authority.

Casinos licensed under the UK testing regime

Because the obligation to use an approved lab comes with the Gambling Commission licence, the useful question about any casino is who holds its licence. The brands below are three we cover, with the licence holder for each so you can check the register entry yourself. Offers were last checked on 5 October 2026; 18+ and terms apply.

• Coral Casino (LC International Limited, account 54743): new players who deposit and bet at least £10 on slots receive 100 free spins on selected games at 10p each, to accept within 48 hours and use within 7 days, with no wagering on winnings. Neteller, PayPal, Skrill, Paysafe, prepaid cards and certain debit cards don’t qualify. Details on Coral’s casino page.
• PlayOJO (Skill On Net Limited, account 39326): new UK customers, excluding Northern Ireland, get 80 free spins on Big Bass Bonanza at 10p each with a first deposit of £10 or more; winnings are paid as cash with no wagering, and the offer can’t be combined with others. See our PlayOJO overview.
• Casumo (Recro Limited, account 61549): new customers who opt in and deposit £20 or more receive a 50% bonus up to £100, with 10x wagering on the bonus within 7 days and a £5 maximum bet while it is active; game and payment restrictions apply. More on our Casumo page.

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