How do we test Sportsbooks at Online Sports Betting?

Testing is at the core of everything we do at OSB. It’s how we ensure our audience gets the most out of our content.

With so many online sportsbooks competing for attention, we believe hands-on evaluation helps us distinguish sportsbooks that meet our standards from those that do not.

Our team of betting specialists brings nearly five decades of combined experience, having reviewed thousands of sportsbooks across the industry. Our team evaluates sportsbooks through a combination of hands-on testing, licensing and regulatory verification, product evaluation, bonus and payment testing, and customer support testing.

We also monitor recommended sportsbooks for material changes that could affect our reviews, ratings, or recommendations.

Our sportsbook review criteria

We assess each online sportsbook across the following nine core review criteria:

Licensing and safety

The OSB team independently reviews licensing and regulatory information for recommended sportsbooks. We use sources such as official regulator websites, government databases, licensing registers, regulatory notices, and operator information to confirm licensing status, operator identity, operating history, and relevant regulatory action.

We also review the account and security protections made available to players, including the security measures described by the operator.

Betting markets

Betting coverage is a key element of any operator's service. As such, our editorial team regularly reviews operators for sports coverage, market depth, props, futures, live betting, and sport-specific markets.

Odds competitiveness

Our team of analysts regularly reviews odds and compares operators with competitors to assess value. This analysis is carried out across a range of markets, futures, and props and includes calculations of sportsbook margins and the prices available to bettors.

Bonuses and promotions

Bonuses, including welcome bonuses, reload offers, free bets, and odds boosts, are an important part of our sportsbook evaluations.

We review the terms and conditions of these offers, including eligibility requirements, rollover or playthrough requirements, minimum qualifying odds, expiry periods, maximum bet rules, payment restrictions, and other conditions that can affect the value or use of a promotion. We also use mathematical analysis to assess bonus value based on the applicable terms.

Where account eligibility, location, and offer availability allow, we claim promotions and test how their terms work in practice. This can include making qualifying deposits and bets and checking how bonus funds, free bets, or other rewards are credited and applied. We do not assume that every promotion can be claimed and tested by every reviewer.

Payments and payout speed

We assess payment services by reviewing deposit methods, withdrawal methods, fees, limits, processing times, and withdrawal requirements. Where payment testing is possible, we also consider our actual deposit and payout experience.

User and mobile experience

Our team actively uses each operator to test the user experience, focusing on navigation, bet-slip usability, ease of use, and speed across devices. This includes desktop and mobile web, plus iOS and Android apps where they are available to us.

We also test the signup process for speed, ease of use, and clarity around registration, verification, and account requirements.

Customer support

We assess the customer support channels available, including phone, email, and live chat where offered. Our testing considers response times, support representative knowledge and helpfulness, and the accuracy of answers provided.

Where appropriate, we contact support without identifying ourselves as OSB reviewers so that we can assess the standard customer experience. The contact methods and type of support testing can vary depending on the services available from each sportsbook.

Responsible gambling

We check the responsible gambling tools and information made available by operators. This can include deposit limits, spending or wagering limits, time limits, cool-off periods, self-exclusion, responsible gambling information, and access to professional support resources.

Refer to our responsible gambling policy for further information.

Reputation and operator history

For new sportsbooks, we check operating history, ownership, previous brands where relevant, regulatory issues, payment complaints, security incidents, and significant user complaints. This also extends to our current recommended operators when material new information becomes available.

How we test sportsbooks in practice

Hands-on testing is a core part of our sportsbook review process, but not every test can be completed for every sportsbook. Location, account eligibility, payment availability, product access, and operator requirements can affect which tests a reviewer can perform.

Standard checks: Our review process includes checking licensing and operator information, reviewing sportsbook features and betting markets, examining bonus terms, assessing payment options and requirements, navigating the sportsbook across available devices, reviewing responsible gambling features, and assessing available customer support channels.

Checks performed where possible: Where we can create and use an eligible account, we complete registration, navigate the sportsbook while logged in, use the bet slip, place bets, test customer support, and assess account-level responsible gambling tools.

Selective and location-dependent tests: Where location, account eligibility, payment methods, and product availability allow, we make real-money deposits and bets, complete required identity verification or KYC checks, claim available promotions, request withdrawals, and test iOS or Android apps. These tests are not possible for every sportsbook or every reviewer, so our reviews identify findings based on the checks we are able to complete.

Vetting for safety and security

Sportsbooks must meet our baseline safety and security criteria before they can be recommended.

We maintain our sportsbook blacklist for sites found to have:

Abusive, scammy, and fraudulent bonus terms and conditions: We flag sportsbooks when we identify misleading or unfair bonus rules, such as undisclosed rollover requirements or wagering restrictions that materially affect how an offer can be used.

Excessively slow payout speeds or nonpayment of winnings: Payment problems, including materially delayed withdrawals or nonpayment of legitimate winnings, can prevent a sportsbook from meeting our standards.

Insufficient, questionable, or complete lack of licensing and regulation: We assess the licensing and regulatory information available for each sportsbook and consider whether it meets our baseline standards for recommendation.

Serious security problems, breaches, or other cybersecurity issues: Significant security incidents or evidence of inadequate account or data protections can affect whether a sportsbook remains eligible for recommendation.

This vetting process helps determine which sportsbooks meet OSB's baseline safety and trust standards. Sportsbooks must meet these standards before they can be recommended.

How we calculate sportsbook rankings

We assess sportsbooks across market coverage, odds competitiveness, live betting, mobile experience, bonuses, payments and payout speed, security and customer support, licensing, and reputation.

Each criterion is assessed by our editorial team using the evidence gathered through our review and testing process. We then apply the weighting relevant to the page or betting market being reviewed. For example, the NFL weighting shown below gives NFL market coverage 25% of the overall assessment and odds competitiveness 15%.

The weighted criteria inform the final rating and ranking displayed by OSB. Our editorial team reviews the underlying evidence and has final responsibility for the published rating and recommendation rather than relying on an automated calculation alone. We do not publish a separate numerical scoring scale or formula for each individual criterion on this page, so we do not represent the final rating as the result of a formula that is not part of our documented methodology.

Serious licensing, security, payment, or player-safety concerns are treated as eligibility issues rather than ordinary weighted criteria. Strong performance in areas such as market coverage, bonuses, or mobile experience does not override a material safety concern. Where a sportsbook fails our baseline standards, our editorial team can remove it from recommendations or assess whether it meets the criteria for our sportsbook blacklist.

How our rankings change by page

OSB ranking weights depend on the specific market we are ranking. For example, here is our NFL weighting:

The review criteria and page-specific ranking factors do not always map one-to-one. Some criteria may be combined, separated, or treated as baseline eligibility requirements depending on the type of page. For example, responsible gambling is reviewed as part of our overall player-safety assessment rather than receiving a separate percentage weighting in the NFL ranking shown above.

In the NFL example, market coverage is the priority. In a sport where in-play markets have a greater role, such as soccer, live betting may receive a greater weighting.

Licensing and serious player-safety issues work as minimum eligibility standards. Higher rankings in other categories, such as market coverage, do not offset major licensing or security failures.

How we verify sportsbook information

When verifying sportsbook information, we use multiple sources in line with our sourcing and fact-checking standards. These can include gaming regulators, government databases, official licensing registers, regulatory notices, official sportsbook websites and terms and conditions, operator documentation, and direct OSB testing.

Where additional context is required, we may also use reputable secondary sources.

How we re-test and update sportsbooks

Review frequency

Our monitoring team rechecks recommended sportsbooks for material changes to their licensing, products, payments, promotions, and player experience. We also conduct additional reviews when material changes or new information could affect an existing assessment.

This methodology does not establish a fixed public re-review interval, so we do not claim a specific daily, weekly, monthly, or annual cadence. Reviews are updated when our monitoring identifies information that could materially affect the accuracy of the page, rating, or recommendation.

Update triggers

Material changes can trigger an additional review or content update. These include licensing changes, regulatory action, ownership changes, rebrands, sportsbook closures, bonus changes, payment problems, significant product or app changes, security incidents, significant user complaints, and changes to responsible gambling tools.

Proactively monitoring community feedback

We use community feedback as an early-warning source. This can include sports betting forums, Reddit, blogs, and reports from users, which can help us identify potential changes in payout experiences or other sportsbook issues.

Community reports do not by themselves determine a sportsbook rating, recommendation, or blacklist decision. We independently check potential issues using appropriate sources and testing where possible before they affect our editorial assessment.

If you have feedback or information about a sportsbook, you can report a sportsbook issue.

Editorial independence and affiliate relationships

Affiliate partnerships are not a sportsbook rating factor, and affiliate commission does not increase an operator's score. Non-affiliate sportsbooks can be recommended, while affiliate sportsbooks can receive lower ratings or lose recommendation status if they no longer meet our standards.

Our editorial reviewers remain responsible for ratings and recommendations. Read more about how OSB manages affiliate relationships.

Led by industry professionals

Our sportsbook testing and review team includes experienced betting writers, analysts, journalists, and industry specialists, including Dan Favale, Eric Uribe, Chris Wassel, Rowan Ward, and Chris Boline. Their backgrounds cover professional sports analysis, sports journalism, betting markets, racing, regulation, and the business of sport.

You can meet our sportsbook experts and learn more about their individual experience.

Who reviews this methodology

Our editorial team is responsible for reviewing and updating this methodology, approving changes to the scoring criteria, and ensuring it continues to reflect the testing OSB actually performs.

Last reviewed: September 15, 2026
Reviewed by: Johnny Franscisco, Editorial Team

What to expect from an OSB sportsbook review

When you read an OSB sportsbook review, you can expect a documented evaluation based on hands-on testing where possible, verification of licensing and operator information, and assessment of the sportsbook's betting markets, odds, promotions, payments, usability, customer support, and responsible gambling tools.

Our ratings and rankings are informed by the review criteria explained on this page, with page-specific weighting applied where relevant. We also revisit sportsbook information when material changes to licensing, ownership, payments, products, security, or player experience could affect our assessment.