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Methodology & Metrics

Find out how SlotsUp rates casinos, bonuses, and games using its own metrics to ensure fairness, safety, and quality for every user.

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Casinos
We assess casino sites using 4 metrics: Safety Index, SlotsUp Casino Rating, Casino Match, and User Rating.
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Games
We assess casino games using 3 metrics: the SlotsUp Game Rating, User Impressions, and Radar.
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Bonuses
We assess casino bonuses using 1 metric: the SlotsUp Bonus Rating, which includes 5 criteria.

How we Rate
casinos

Metric #1: SlotsUp Casino Rating

The SlotsUp Casino Rating is calculated based on 8 key metrics, each scored from 0 to 100. These scores are summed, averaged and used to determine the final overall rating.

High (100 - 90)

Good (89 - 70)

Bad (69 - 0)

License

Before assessing the rating for the “License” criterion, we consider the following factors:

  1. The markets the casino operates in and their regulations.
  2. Is it international online casino or focused on a specific country?
  3. The license or licenses held by the online casino.

Based on these factors, we form our assessment.

ConditionsRating
If it is an online casino without any license.0
If it is an international online casino with licenses such as CGA, KGC, ALS, FSRC, IOM GSC, or AGCC.70
If it is an international online casino with an MGA license.80
If it is an international online casino with an MGA license and an additional one — such as CGA.90
If it is an international online casino with an MGA license and a local license for a specific regulated market.100
If the casino is local to a specific regulated market and holds a local license.100
Note

If the casino has violations or complaints related to its license or legal operations, it may lose further points in the rating.

Reputation

Before assessing the rating for the “Reputation” criterion, we consider the following factors:

  1. The reputation and user feedback of the casino across public information and UCG platforms.
  2. The reputation of the company that owns the casino, as well as the reputation of any other brands under its ownership.
  3. The reputation of other brands within the affiliate program to which the casino belongs.

Based on these factors, we form an objective assessment.

Bonuses

Before assessing the rating for the “Bonuses” criterion, we consider the following factors:

  1. The types of bonuses a casino offers to new and existing users.
  2. Bonus amounts, including bonus money, free spins, and free chips.
  3. Bonus requirements, compared to industry averages.
  4. Availability of exclusive bonuses for SlotsUp users.

Based on these factors, we form our assessment.

ConditionsRating
If the casino offers no bonuses for new users.0
If the casino only offers a welcome bonus with higher-than-average requirements.70
If the casino only offers a welcome bonus with low or average requirements..80
If the casino offers bonuses (welcome and exclusive no deposit) with higher-than-average requirements.90
If the casino offers bonuses (welcome and exclusive no deposit) with low or average requirements.100
Note
  • If a bonus has money, free spins, or free chips above the average amount, we may add extra points.
  • If a bonus has money, free spins, or free chips above the average amount, we may add extra points.

Banking options

Before assessing the rating for the “Banking options” criterion, we consider the following factors:

  • Payment systems: For deposits and withdrawals.
  • Payment limits: For deposits and withdrawals.
  • Quantity of banking options: : Comparison with other casinos.
  • Local payments: Support for popular local deposit and withdrawal options.
  • Public payment information:: Easily accessible and clearly presented to the user.
  • Guides: Availability of instructions on how to deposit and withdraw money.

Based on these factors, we form our assessment.

Games & Providers

Before assessing the rating for the “Games & Providers” criterion, we consider the following factors:

  1. List of providers and game types.
  2. Completeness of information about games.
  3. Ease of navigation: availability of convenient search, filtering, and grouping of games.
  4. Frequency of updates: presence of new games and how regularly they are added.
  5. Demo mode availability: the option to play games in demo mode for testing purposes.
  6. Jackpot games: presence and quantity of available jackpot games.

Based on these factors, we form our assessment.

ConditionsRating
If the casino offers fake or unlicensed casino games.0
Limited selection of games and providers (up to 5), minimal game information, and poor navigation.30
Average selection of games and providers (from 6 to 30), but missing some of the key points mentioned above.60
Wide selection of games and providers (31 or more), but missing few of the key points mentioned above.80
Wide selection of games and providers (31 or more), including all key points mentioned above.90
Wide selection of games and providers (31 or more), including exclusive branded games.100
Note

When assessing game types and providers, we also consider the markets where the casino operates and the regulations in place, to provide a more objective and fair assessment.

Terms & Conditions

Before assessing the rating for the “Terms & Conditions” criterion, we consider the following factors:

  • Unfair T&Cs:
    The casino must not have seriously unfair T&Cs, such as extremely high bonus requirements, abnormally low withdrawal limits, hidden fees, unclear max bet rules, unclear or hard-to-find country restrictions, or rules that could unfairly void player winnings or violate the law.
  • Fraud:
    The T&Cs must not include vague language or rules that could be misused to void legitimate player winnings.
  • Clear restrictions:
    Casinos must properly block players from restricted countries and prevent them from registering and claiming bonuses.
  • Payout of legitimate winnings:
    The casino must pay out all legitimate player winnings without unreasonable delays or unjustified denials.
  • Assistance in Rule compliance:
    Rules like max bet or bonus limits should be automatically applied by the casino, not left for the player to keep track of.

Based on these factors, we form our assessment.

ConditionsRating
Seriously unfair T&Cs. High chance of players facing unsafe experiences or issues.0
Multiple unfair or tricky T&Cs that could potentially cause issues.40
Some questionable or unclear T&Cs, but no serious threats to unsafe experiences or issues.70
Mostly fair and clear T&Cs with minor issues that do not seriously affect players' experience.90
T&Cs are fully fair, transparent, and player-protective, with no unfair rules.100
Note
  • If a casino’s Terms and Conditions are limited by mandatory regulations (such as win limits or max bet restrictions imposed by law), we take this into account and do not lower the casino's rating.
  • If a casino sets very low win limits (e.g., under $10,000) without any legal reason, we consider it unfair and lower its rating.

Our goal is to give a high rating to casinos whose T&Cs are not only legally correct but also protect players and ensure a fair and safe experience.

Support & Care

Before assessing the rating for the “Support & Care” criterion, we consider the following factors:

  1. Communication channels: Availability of live chat, email, phone, and other ways to contact support.
  2. Response time: How fast the support team answers.
  3. Helpfulness and professionalism: Whether support gives clear, useful, and polite answers.
  4. Availability:24/7 support or limited hours.
  5. Languages: Support in different and local languages.
  6. Self-help: FAQ, guides, and help centers for independent problem-solving.
  7. Proactive: Whether the casino actively helps users with issues.

Based on these factors, we form our assessment.

ConditionsRating
No support available or very poor service.0
Limited support options, slow responses, and low-quality help.40
Limited support options, slow responses, and basic-quality help.60
Main support options, helpful and professional service with minor limitations (e.g., not 24/7).80
Main support options with excellent service: fast, helpful, professional, 24/7, with proactive assistance.100
Note
  • We do not lower the rating if a casino lacks phone support but provides fast and professional live chat or other effective channels.
  • Self-help resources (FAQ, guides) are important but not mandatory for the maximum rating if online support is excellent.

Responsible gambling tools

Before assessing the rating for the “Responsible gambling tools” criterion, we consider the following factors:

  1. Availability of tools: Deposit limits, loss limits, wagering limits, session time limits, time-out, and self-exclusion options must be available.
  2. Ease of use: Tools must be easily accessible and simple to set up without needing to contact support.
  3. External references: Links to responsible gambling help centers and organizations must be provided by casino site.

Based on these factors, we form our assessment.

ConditionsRating
No responsible gambling tools available.0
Very limited tools available and hard to find or set up.40
Core tools available but not very visible or easy to use.60
All key tools available and easily accessible.80
Full set of responsible gambling tools available, easily accessible, and actively promoted by casino.100
Note
  • We do not lower the rating if some secondary responsible gambling tools are missing, as long as all key tools (deposit limits, loss limits, self-exclusion) are present and easy to use.
  • Extended features like exclusive responsible gambling options or programs can positively impact the rating.

Metric #2: Safety Index

We assess a casino’s safety based on 4 criteria (2 individual and 2 interrelated), each scored from 0 to 100. The scores are then summed, averaged, and used to determine the final safety index.

High (100 - 90)

Good (89 - 70)

Bad (69 - 0)

License Owner’s reputation and transparency

We assess how trustworthy and safe the company holding the casino’s license is by reviewing public information, official registers, and the company’s history, including any past issues, fines, or feedback.

Based on these factors, we form our assessment, which is centralized and consistently applied to all casinos operated by the same company.

ConditionsRating
Serious company issues (e.g., complaints, fines, problems with regulators or licensing authorities) that could make the user experience unsafe.0
Minor past issues or currently questionable reputation.70
Minor past issues, but now no reputation problems.80
Fully transparent company with a strong, positive reputation.90
Note
  • Minor fines or complaints typically do not impact the rating.
  • If a company had past issues but fixed them, we may change the rating.

Subsidiary casinos’ rating under same ownership

This rating is automatically calculated as the average SlotsUp Rating of all casinos owned by the same company. It directly and objectively influences the Safety Index.

If the company owns only one casino, this criterion is not considered when forming the Safety Index.

Volume and severity of user complaints

We evaluate how many complaints the casino has received, how serious they are, and how the casino handles them.

We consider both the number and the nature of complaints (e.g., delayed or canceled payments, unfair treatment, or violations of the casino's T&Cs).

ConditionsRating
High volume of serious complaints..0
High volume of complaints, but not critical.40
Few minor complaints, but not critical.80
Almost no complaints.100
Note
  • Minor fines or complaints typically do not impact the rating.
  • If a company had past issues but fixed them, we may change the rating.

Compliance with regulations and licensing

We assess whether the casino has any serious complaints, warnings, or issues with its licensing and regulators.

ConditionsRating
Critical violations by licensing authorities or local regulators (e.g., license suspension, regulatory sanctions).0
Minor violations by licensing authorities or local regulators (e.g., warnings, fines).40
Historical violations by licensing authorities or local regulators, now resolved.80
Full compliance with no issues (including historical compliance).100
Note

Minor past violations that have been fully corrected may not affect the current rating.

Metric #3: Casino Match

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Casino Match is a metric that shows how well a casino aligns with a user's preferences and region. It is based on 4 key criteria that are autodetected: country, currency, interface language, and support language. Each criterion contributes 25% to the overall score.

Metric #4: User Rating

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User Rating shows the average score given to a casino by real users. It’s based on user reviews and experiences, giving an overall view of the casino’s reputation.

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How we Rate
Games

Metric #5: SlotsUp Game Rating

The SlotsUp Game Rating is calculated based on 7 key criteria, each scored from 0 to 100. These scores are then summed, averaged, and used to determine the final overall rating.

For different types of games, different criteria and forms of assessment may be used.

High (100 - 90)

Good (89 - 70)

Bad (69 - 0)

Payouts and RTP

We assess RTP using a specific scale that depends on the type of game.

For online slots:

RTPRTP
97–100%
RTP
96-97%
RTP
95–96%
RTP
94–95%
RTP
93-94%
RTP
92-93%
RTP
91-90%
RTP
0-90%
Rating1009080706050300
RTPRating
RTP
97–100%
100
RTP
96–97%
90
RTP
95–96%
80
RTP
94–95%
70
RTP
93–94%
60
RTP
92–93%
50
RTP
91–90%
30
RTP
0–90%
0

For online roulette:

RTPRTP
98–100%
RTP
97-98%
RTP
96–97%
RTP
95–96%
RTP
94-95%
RTP
93-94%
RTP
92-93%
RTP
0-92%
Rating1009080706050300
RTPRating
RTP
98–100%
100
RTP
97–98%
90
RTP
96–97%
80
RTP
95–96%
70
RTP
94–95%
60
RTP
93–94%
50
RTP
92–93%
30
RTP
0–92%
0

For online blackjack:

RTPRTP
99.5–100%
RTP
99–99.5%
RTP
98.5–99%
RTP
98–98.5%
RTP
97–98%
RTP
96–97%
RTP
95–96%
RTP
0–95%
Rating1009080706050300
RTPRating
RTP
99.5–100%
100
RTP
99–99.5%
90
RTP
98.5–99%
80
RTP
98–98.5%
70
RTP
97–98%
60
RTP
96–97%
50
RTP
95–96%
30
RTP
0–95%
0

For online baccarat:

RTPRTP
99–100%
RTP
98.5–99%
RTP
98–98.5%
RTP
97.5–98%
RTP
97–97.5%
RTP
96–97%
RTP
95–96%
RTP
0–95%
Rating1009080706050300
RTPRating
RTP
99–100%
100
RTP
98.5–99%
90
RTP
98–98.5%
80
RTP
97.5–98%
70
RTP
97–97.5%
60
RTP
96–97%
50
RTP
95–96%
30
RTP
0–95%
0

For online video poker:

RTPRTP
99–100%
RTP
98–99%
RTP
97–98%
RTP
96–97%
RTP
95–96%
RTP
94–95%
RTP
93–94%
RTP
0–93%
Rating1009080706050300
RTPRating
RTP
99–100%
100
RTP
98–99%
90
RTP
97–98%
80
RTP
96–97%
70
RTP
95–96%
60
RTP
94–95%
50
RTP
93–94%
30
RTP
0–93%
0

For online crash game:

RTPRTP
98–100%
RTP
97–98%
RTP
96–97%
RTP
95–96%
RTP
94–95%
RTP
93–94%
RTP
92–93%
RTP
0–92%
Rating1009080706050300
RTPRating
RTP
98–100%
100
RTP
97–98%
90
RTP
96–97%
80
RTP
95–96%
70
RTP
94–95%
60
RTP
93–94%
50
RTP
92–93%
30
RTP
0–92%
0

For online dice & craps:

RTPRTP
98–100%
RTP
97–98%
RTP
96–97%
RTP
95–96%
RTP
94–95%
RTP
93–94%
RTP
92–93%
RTP
0–92%
Rating1009080706050300
RTPRating
RTP
98–100%
100
RTP
97–98%
90
RTP
96–97%
80
RTP
95–96%
70
RTP
94–95%
60
RTP
93–94%
50
RTP
92–93%
30
RTP
0–92%
0

For online scratch cards:

RTPRTP
96–100%
RTP
94–96%
RTP
92–94%
RTP
90–92%
RTP
88–90%
RTP
86–88%
RTP
84–86%
RTP
0–84%
Rating1009080706050300
RTPRating
RTP
96–100%
100
RTP
94–96%
90
RTP
92–94%
80
RTP
90–92%
70
RTP
88–90%
60
RTP
86–88%
50
RTP
84–86%
30
RTP
0–84%
0

For online bingo:

RTPRTP
97–100%
RTP
95–97%
RTP
93–95%
RTP
91–93%
RTP
89–91%
RTP
87–89%
RTP
85–87%
RTP
0–85%
Rating1009080706050300
RTPRating
RTP
97–100%
100
RTP
95–97%
90
RTP
93–95%
80
RTP
91–93%
70
RTP
89–91%
60
RTP
87–89%
50
RTP
85–87%
30
RTP
0–85%
0

For online keno:

RTPRTP
96–100%
RTP
94–96%
RTP
92–94%
RTP
90–92%
RTP
88–90%
RTP
86–88%
RTP
84–86%
RTP
0–84%
Rating1009080706050300
RTPRating
RTP
96–100%
100
RTP
94–96%
90
RTP
92–94%
80
RTP
90–92%
70
RTP
88–90%
60
RTP
86–88%
50
RTP
84–86%
30
RTP
0–84%
0

For online slingo:

RTPRTP
96-100%
RTP
94-96%
RTP
92-94%
RTP
90-92%
RTP
88-90%
RTP
86-88%
RTP
84-86%
RTP
0-84%
Rating1009080706050300
RTPRating
RTP
96–100%
100
RTP
94–96%
90
RTP
92–94%
80
RTP
90–92%
70
RTP
88–90%
60
RTP
86–88%
50
RTP
84–86%
30
RTP
0–84%
0

For online sic bo:

RTPRTP
97-100%
RTP
96-97%
RTP
95-96%
RTP
94-95%
RTP
93-94%
RTP
92-93%
RTP
91-92%
RTP
0-91%
Rating1009080706050300
RTPRating
RTP
97–100%
100
RTP
96–97%
90
RTP
95–96%
80
RTP
94–95%
70
RTP
93–94%
60
RTP
92–93%
50
RTP
91–92%
30
RTP
0–91%
0

For online plinko:

RTPRTP
98-100%
RTP
97-98%
RTP
96-97%
RTP
95-96%
RTP
94-95%
RTP
93-94%
RTP
92-93%
RTP
0-92%
Rating1009080706050300
RTPRating
RTP
98–100%
100
RTP
97–98%
90
RTP
96–97%
80
RTP
95–96%
70
RTP
94–95%
60
RTP
93–94%
50
RTP
92–93%
30
RTP
0–92%
0

Features

Before assessing the rating for the "Features" criterion, we consider the following factors:

  1. Availability of standard features of the game (like free spins, wilds, bonus rounds).
  2. Availability of additional or unique features of the game.

Based on these factors, we form our assessment.

ConditionsRating
No features or a very limited set of basic features.0
Only basic standard features, but without influence on gameplay.40
Set of standard features + some unique features that slightly improve gameplay.60
Full set of standard features + some unique features that moderately improve gameplay.80
Full set of standard features + some unique features that make the gameplay highly engaging.100
Note

Features that make the gameplay more engaging have a strong impact on the final rating.

Game Mechanics

Before assessing the rating for the 'Game Mechanics' criterion, we consider the following factors:

  1. Standard mechanics that form the core of the gameplay.
  2. Modern or unique mechanics integrated into the core of the gameplay.
  3. The level of game engagement.

Based on these factors, we form our assessment.

ConditionsRating
Very basic and unengaging mechanics. (Line, Ways, Fixed Paylines).40
Simple mechanics with moderate engagement. (Line, Ways, Fixed Paylines).60
Modern mechanics with moderate engagement. (Megaways, Cluster Pays, Cascading or Expanding Reels).80
Modern mechanics with high engagement. (Megaways, Cluster Pays, Cascading or Expanding Reels).100

Win Potential

Before assessing the rating for the "Win Potential" criterion, we consider the following factors:

  1. RTP.
  2. Volatility.
  3. Hit Frequency.
  4. Multiplier.
  5. Exposure.
  6. Max Bet.

Based on these factors, we form our assessment.

ConditionsRating
Very low win potential: low multiplier (up to x1000) + low volatility + RTP < 95%.20
Low win potential: low multiplier (up to x1000) + medium/high volatility + RTP ≥ 95%.40
Medium win potential: medium multiplier (x1000–x5000) + any volatility + RTP ≥ 95%.60
High win potential: high multiplier (> x5000) + low/medium volatility + RTP ≥ 96%.80
Very high win potential: high multiplier (> x5000) + high volatility + RTP (≥ 97%).100
Note

We can add extra points to the Win Potential rating for high max bet (more than $100), high hit frequency (more than 40%), and high maximum exposure.

Theme, Graphics and Effects

  • Terrible quality: poor graphics, design and sound effects: 20
  • Below average quality: 40
  • Average design and sound effects: 60
  • Good design, but graphics and sound effects are less impressive: 80
  • Modern, high-quality design with impressive graphics, sound effects, and a popular game theme.: 100

Impressions from Testing

  • No payouts and no features: 0
  • Very low payouts and no features: 20
  • Below average payouts: 40
  • Average payouts with standard features: 60
  • Mostly high payouts with attractive feature: 100

Provider reputation score

  • Poor reputation: 0
  • Average reputation or new provider: 40
  • Good reputation, positive reviews: 80
  • Great reputation, high quality slots, honest and licensed, jackpots available: 100

Metric #6: Users Impressions

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Users Feedback shows the average score given to a game by real users that played and tested the game in demo mode on SlotsUp. It is divided into 3 ranges: positive, negative, and mixed impressions, along with their respective percentages.

Metric #7: Radar

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Radar visually compares the win potential of your selected game with the average indicators of other games of the same type, using our infographic chart.

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How we Rate
Bonuses

Metric #8: SlotsUp Bonus Rating

The SlotsUp Bonus Rating is calculated based on 5 key metrics, each scored from 0 to 100. These scores are summed, averaged, and used to determine the final overall rating.

High (100 - 90)

Good (89 - 70)

Bad (69 - 0)

Bonus Amount

We assess the overall value of a bonus by evaluating its key components: the percentage, the amount of bonus money (deposit or no deposit), and the number of free spins (also for deposit or no deposit). We compare these values with similar bonuses offered by other casinos that operate under the same type of license and offer a similar type of bonus. Higher ratings are given to bonuses that provide more generous offers.

Wagering Level

Before assessing the rating for the 'Wagering Level' criterion, we consider the following factors:

  1. Type of casino bonus.
  2. What the wagering applies to: bonus, deposit + bonus, free spins, cashback.

Based on these factors, we form our assessment.

ConditionsRating
High wagering (x61 and above)0–49
Middle wagering (x31 – x60)50–79
Low wagering (x1 – x30)80–99
No wagering (x0)100
Note

Wagering applies to:

  • Bonus only: +10 points
  • Deposit + bonus: -10 points
  • Winnings from free spins: +5 points
  • Cashback: +15 points

Game Variety for Bonus

Before assessing the rating for the 'Game Variety for Bonus' criterion, we consider the following factors:

  1. Available game types for the bonus.
  2. Game restrictions.
  3. Contribution percentage by game type.

Bonuses that can be used across a wide range of games, offer high contribution percentages, and have minimal restrictions receive higher ratings. Bonuses that are limited to specific games or come with low contribution rates are rated lower.

Withdrawal Restrictions

We assess any withdrawal restrictions that may apply after claiming or using the bonus. This includes:

  1. Minimum and maximum withdrawal limits.
  2. Restricted withdrawal methods.
  3. Pending time and processing delays.
  4. Additional verification steps.

Bonuses with no or minimal withdrawal restrictions receive higher ratings, as they offer more flexibility and transparency to players.

Note

We also consider the rules and restrictions set by regulated markets as part of our assessment.

General Bonus Terms and Conditions

We assess the general rules that apply to bonus usage, including:

  1. Availability.
  2. Bonus duration and wagering period.
  3. Maximum bet limit.
  4. Clarity of terms.

Bonuses with fair, transparent, and player-friendly terms receive higher ratings, while those with unclear or restrictive conditions are rated lower.

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