Most Popular Slots 2021

The slot rating is created based on the actual data we received from online casinos listed below. Operators each provide their lists of the TOP 100 slots in 2021 that are used to determine the overall best performing titles. ClashofSlots collects all the ratings to find out the most popular title across multiple gambling sites. All slots are assigned a certain amount of points depending on their popularity within a single casino. Slots earn 100 points for the first place in a rating, 99 – for the second, 98 – for the third, and so on. After adding up all scores, we get the overall slot popularity rating in 2021.

 

Most Popular Slots 2021

The slot rating is created based on the actual data we received from online casinos listed below. Operators each provide their lists of the TOP 100 slots in 2021 that are used to determine the overall best performing titles. ClashofSlots collects all the ratings to find out the most popular title across multiple gambling sites. All slots are assigned a certain amount of points depending on their popularity within a single casino. Slots earn 100 points for the first place in a rating, 99 – for the second, 98 – for the third, and so on. After adding up all scores, we get the overall slot popularity rating in 2021.

 

Book of Dead Free Play in Demo Mode
1
Book of Dead

14.01.2016,

RTP: 96.21%, Max Win: x5000, Volatility: High

557 scores
Sweet Bonanza Free Play in Demo Mode
2
Sweet Bonanza

27.06.2019,

RTP: 96.51%, Max Win: x21100, Volatility: Above average

496 scores
Legacy of Dead Free Play in Demo Mode
3
Legacy of Dead

02.01.2020,

RTP: 96.58%, Max Win: x5000, Volatility: High

452 scores
The Dog House Free Play in Demo Mode
4
The Dog House

05.03.2019,

RTP: 96.51%, Max Win: x6750, Volatility: High

446 scores
Tome of Madness Free Play in Demo Mode
5
Tome of Madness

27.06.2019,

RTP: 96.59%, Max Win: x2000, Volatility: High

417 scores
Big Bass Bonanza Free Play in Demo Mode
6
Big Bass Bonanza

03.12.2020, ,

RTP: 96.71%, Max Win: x2100, Volatility: High

416 scores
The Dog House Megaways Free Play in Demo Mode
7
The Dog House Megaways

17.07.2020,

RTP: 96.55%, Max Win: x12305, Volatility: High

413 scores
Midas Golden Touch Free Play in Demo Mode
8
Midas Golden Touch

10.04.2019,

RTP: 96.1%, Max Win: x10100, Volatility: High

402 scores
Minotaurus Free Play in Demo Mode
9
Minotaurus

19.03.2015,

RTP: 96%, Max Win: x10000, Volatility: High

Features: ,
379 scores
Razor Shark Free Play in Demo Mode
10
Razor Shark

20.08.2019,

RTP: 96.70%, Max Win: x50000, Volatility: High

374 scores
Wild West Gold Free Play in Demo Mode
12
Wild West Gold

26.03.2020,

RTP: 96.51%, Max Win: x10000, Volatility: High

350 scores
Rise of Merlin Free Play in Demo Mode
13
Rise of Merlin

17.06.2019,

RTP: 96%, Max Win: x5000, Volatility: High

345 scores
Book of Santa Free Play in Demo Mode
14
Book of Santa

10.12.2020,

RTP: 96%, Max Win: x5000, Volatility: Low

340 scores
Mongol Treasures Free Play in Demo Mode
15
Mongol Treasures

20.01.2015,

RTP: 96%, Max Win: x5000, Volatility: High

Features:
337 scores
Bigger Bass Bonanza Free Play in Demo Mode
16
Bigger Bass Bonanza

16.09.2021, ,

RTP: 96.71%, Max Win: x4000, Volatility: High

328 scores
Iron Bank Free Play in Demo Mode
17
Iron Bank

28.10.2020,

RTP: 96.20%, Max Win: x49999, Volatility: High

288 scores
Sakura Fortune Free Play in Demo Mode
18
Sakura Fortune

03.04.2017,

RTP: 96.58%, Max Win: x941, Volatility: High

285 scores
Book of Aztec Free Play in Demo Mode
20
Book of Aztec

05.06.2015,

RTP: 97.6%, Max Win: x5000, Volatility: Average

272 scores
Space Wars Free Play in Demo Mode
21
Space Wars

12.11.2013,

RTP: 96.75%, Max Win: x1000, Volatility: Average

258 scores
Jammin’ Jars 2 Free Play in Demo Mode
22
Jammin’ Jars 2

02.06.2021,

RTP: 96.40%, Max Win: x50000, Volatility: High

235 scores
Divine Fortune Free Play in Demo Mode
23
Divine Fortune

25.01.2017,

RTP: 96.59%, Max Win: x600, Volatility: Average

230 scores
Book of Fortune Free Play in Demo Mode
24
Book of Fortune

15.11.2014,

RTP: 96%, Max Win: x5000, Volatility: High

228 scores
Dinopolis Free Play in Demo Mode
25
Dinopolis

09.04.2021,

RTP: 96.4%, Max Win: x50000, Volatility: High

224 scores
Lovely Lady Free Play in Demo Mode
26
Lovely Lady

03.08.2015,

RTP: 96%, Max Win: x5000, Volatility: Average

204 scores
Dead or Alive 2 Free Play in Demo Mode
27
Dead or Alive 2

23.04.2019,

RTP: 96.8%, Max Win: x111111, Volatility: High

202 scores
Sun of Egypt 2 Free Play in Demo Mode
28
Sun of Egypt 2

29.10.2020,

RTP: 95.64%, Max Win: x5000, Volatility: High

199 scores
Lucky Streak 3 Free Play in Demo Mode
29
Lucky Streak 3

02.03.2019,

RTP: 96%, Max Win: x7500, Volatility: Average

195 scores
Book of Oil Free Play in Demo Mode
30
Book of Oil

23.09.2021,

RTP: 96.05%, Max Win: x5000, Volatility: Average

193 scores
Displaying 30 of 339 slots

Top Slots Developers 2021

The slot rating is used to determine the popularity of the studios. To rank high, suppliers need their games to get a high popularity score. Based on the number of slots that make it to the slot ratings and their position within the rating, we’ve determined the TOP best slot developers in 2021:

1
Endorphina
43 slot machines nominated
4564 scores
2
Pragmatic Play
30 slot machines nominated
4171 scores
3
Play’n GO
14 slot machines nominated
2519 scores
4
Amatic Industries
24 slot machines nominated
2488 scores
5
Push Gaming
11 slot machines nominated
1373 scores
6
NetEnt
15 slot machines nominated
1318 scores
7
Thunderkick
11 slot machines nominated
1256 scores
8
Playson
14 slot machines nominated
1175 scores
9
PGSoft
14 slot machines nominated
1148 scores
10
Booongo
16 slot machines nominated
1065 scores
Displaying 10 of 45 providers
Top Slots Developers 2021

Results and Distribution of Slots in Online Casinos

 

341 slot machines took part in the competition. The following online casinos have shared with us the data on the popularity of slots (when playing for real money in 2021): 1xSlots Casino, PlayFortuna Casino, BitStarz Casino, Vavada Casino, Fairspin Casino, Booi Casino for which many thanks to them.

Game Software Total score 1xSlots Casino PlayFortuna Casino BitStarz Casino Vavada Casino Fairspin Casino Booi Casino
1
557
98
100
66
100
97
96
2
496
82
74
97
87
82
74
3
452
99
98
-
98
59
98
4
446
77
95
-
93
81
100
5
417
88
91
-
94
49
95
6
416
52
97
93
77
-
97
7
413
74
80
3
86
80
90
8
402
97
86
-
97
31
91
9
379
54
82
-
89
73
81
10
374
68
99
-
99
9
99
11
360
48
53
64
82
63
50
12
350
47
90
29
51
65
68
13
345
73
78
-
84
21
89
14
340
100
70
27
92
-
51
15
337
90
76
-
91
-
80
16
328
40
68
63
69
-
88
17
288
-
71
-
88
42
87
18
285
18
87
-
53
41
86
19
280
-
79
-
64
58
79
20
272
7
96
-
75
-
94
Displaying 20 of 339 slots

When you have thousands of options, it’s hard to choose. With the ever-growing slots collection, online gamblers find themselves in this situation. But the easy solution is to trust thousands of savvy gamblers. The rating we provide is based on the actual games performance data in 2021 to reveal the best online slots.

Out of almost 300 titles in 6 casinos, the undisputed number one is Book of Dead, which isn’t surprising considering it’s been an iconic title for many years. Yet again, it showed excellent performance, landing in the top 5 in five out of six casinos. The total score of 557 earned Book of Dead first place in our rating.

The first runner-up, Sweet Bonanza by Pragmatic Play, scored 501 points. The slot was able to show decent results thanks to its solid performance across five casinos, and third place in BitStarz gave it a necessary boost to become second best. Closing the top 3, is another Play’n GO hit, Legacy of Dead.

Playing Online Slots

Gambling experience can be exciting as well as frustrating. The way you manage your gambling behavior will largely affect overall experience. The best online slots are hard to resist, which at times leads to addiction. If you have a hard time ending a gaming session, there are usually multiple responsible gambling tools to help you.

Players always choose between two options, jump into testing demo titles or join a casino and upload some funds. If the decision is to practice, an amazing library of titles is available on ClashofSlots.com. Or you can pick any legitimate gambling operator.

Slots don’t require much preparation even from a complete beginner. You can get your first experience with zero knowledge. The basics to know are how to set a wager size and where to locate Spin button. Practice mode helps to gain confidence.

Best Online Slots to Win Money in 2021

Avoid games with unacceptably low RTP. The industry standard for RTP is around 92-96%. Anything higher than that is great, anything lower isn’t a good option. The perfect slot isn’t the one that offers the highest theoretical return but the one that you enjoy. As long as RTP is within the acceptable range, it doesn’t matter which game to choose.

RTP

The higher the RTP the better because in this case, players on average win more. The actual RTP for a single player, however, can differ significantly from the theoretical value. There should be millions and sometimes billions of spins for the actual RTP to get close to the theoretical.

In the long run, all slots take more from players than they give. But since wins are distributed unevenly, you can be a big winner if you get lucky. RTP isn’t the only parameter to evaluate when looking for the best paying online slots. Below we discuss other important parameters.

Volatility

Volatility/dispersion is the key to having fun. This parameter is responsible for how winnings are spread. There are no best or worst dispersion settings. You just need to understand what works best for you.

  • Low volatility is about rather evenly distributed payouts. You hit regular wins that don’t usually get very big. This option is great for those who want to buy as many rounds for their money as possible.
  • High variance indicates payouts are spread unevenly. Pretty solid win can be followed by a long losing streak. It’s very likely to go bust without a single decent win. Risky but at times extremely rewarding.
  • There are also games with medium, extremely low, and extremely high volatility settings.

Max Win

The maximum payout is usually tied to the variance. Risk is usually correlated with the max potential. Many games have between 5,000x and 20,000x max wins. But an increasing number of titles can award over 50,000x.

Adjustable RTP

Many developers provide operators with different RTP choices for the same titles. For instance, one version returns on average 95% while another version only 90%. This helps suppliers improve sales as gambling sites get higher profit when they choose lower RTP versions. But as a gambler, you would like to have the highest return settings. Usually the difference isn’t very significant, but can be as huge as 15%, which is hard to ignore.

How We Determine Best Slots to Play Online

Ask two players and each will likely mention different favorite titles. But certain slots find massive success among gamblers, and that’s the sure way to identify the best games. To provide the most accurate slots rating, we’ve partnered with several operators that provide their list of top 100 games.

For this 2021 rating we had six casinos submitting their statistics. All individual ratings coming from casinos are then combined to determine the winners. The maximum score a single title could get is 600, which is for landing at the top of all six casinos’ ratings. Second place earns 99 points, third – 98, and so on.

The 2021 winner, Book of Dead, for instance, has collected 557 points in total. It was the best performing slot in two casinos, Playfortuna and Vavada. It came third, fourth, and fifth in 1xSlots, Fairspin and Booi, correspondingly. Surprisingly, it scored only 66 points for not-so-perfect performance in BitStarz. The same title is present in our overall top 100 slots rating.

There’s a variety of factors affecting the level of slot success. They keep players engaged and make them return for more. Below we discuss what are some of the key ingredients of success.

Bonuses

Bonuses contribute a lot to the overall success of a game. They multiply the entertainment value and gamblers seem to love them. At least, that’s what 2021 best slots rating shows. Feature buy has become an increasingly popular option. It gives more control over the experience. The cost of triggering bonus features varies anywhere from 5x to 2,000x, and even though you usually get some extra features activated the round can still be a disappointment.

RTP and Variance

As mentioned, these two characteristics are some of the most important ones in slots. Great math is what attracts and retains gamblers. Artwork and animation can be very simple, but great math is always appreciated.

Gameplay Experience

Gameplay should meet players’ expectations for gambling to be fun. There’s no single gameplay that would ensure success across all types of gamblers. Some top titles are quite uncomplicated while others can have a high entertainment value. A lot of times developers try to copy gameplays that proved to be successful and only the most talented try to figure out new ways to win over audience.

Mobile Optimization

There’s no doubt that mobile phones are taking over the world. But iGaming business are well equipped to accommodate the needs of mobile users. Games are mobile-friendly so that players can enjoy them on the go.

All game developers have long switched to HTML5, which is a cross-platform language. But those studios that take an extra effort to improve mobile games design will have an upper hand. The best online slots are great in both portrait and landscape modes.

Jackpot Value

For big win hunters, a hefty jackpot is very enticing. Chasing progressive jackpots is so exciting that players hardly pay attention to things such as artwork or animation. The size of the pot is correlated with the slot popularity.

But today players have multiple other exciting options, without the need to join millions of other gamblers in their pursuit of the colossal payouts. Smaller jackpots that drop frequently are another popular option.

Where to Play Slots

But one thing to remember to ensure the best online slots experience is to choose a casino. It should provide hassle-free environment for you to relax and have fun. Check out our casino rating to view legitimate operators. All operators listed there are licensed, and casinos that top the rating offer a great value to players.

  • Site Security. Knowing that the site is safe and secure is important, because gambling operators are under constant attack. That’s why it’s always better to join experienced operators or new projects launched by existing gambling families. They have the resources and expertise to fight off security threats and keep their business and players safe.
  • Banking Options. There must be a payment solution you prefer. Use our filters to refine the list and see only those options that suit you.

Types of Online Slots

There’s a huge variety of slots you can find. Studios work hard to provide this variety and have to continuously come up with even more exciting options and features. But it also presents some challenges for new and inexperienced gamblers as they feel overwhelmed with the huge selection. Armed with the list of the best online slots removes the hesitation and gives the confidence that you make the right choice.

Free Slots

Almost any title is available for free, and you usually don’t even have to sign up with a casino to try games. So, there are all sorts of slots to test, including top-performing ones and as you test them. Free slots are the best advantage of playing online.

Vegas Slots

Many suppliers that originally come from the land-based business have also entered the online gambling industry. That’s why you can have many of their games both online and at physical venues. They usually have a slightly different design to them which is very bright and catchy. Other suppliers sometimes replicate the Vegas-style games so that they look and feel similar to those available in the actual Vegas casinos Vegas.

Real Money Slots

To win cash, players need to bet real funds. With money uploaded to your casino account, you can play any game, including exclusive titles, and collect real payouts. To buy more time for the money, players often claim bonuses.

Progressive Slots

Jackpots are an effective tool to attract players. Many progressive jackpot slots offer anywhere from a couple of hundred Euros up to tens of millions. Network jackpots generally offer the biggest payouts as all players across different casinos contribute to the pot. Whereas the accumulation of a local jackpot happens within a single casino or a casino family.

Best Free Online Slots

The slots rating provided on this page shows which are the best performing slots. Every one of those titles is available in the practice mode. So, you can get a free first-hand experience to see which of the popular titles are the most exciting for you.

Best Online Slots Games

There are dozens of titles launched every month, and only a few become truly popular. But as this 2021 rating shows, there are iconic, time-tested titles that perform extraordinary well throughout the years. Book of Dead, which tops the rating, was rolled out in 2016 instantly becoming massively popular. As time goes by, the slot doesn’t show signs of slowing down. Dog House, Razor Shark, Sakura Fortune, Jammin’ Jars, Divine Fortune, and some other epic titles remain popular despite hundreds of new games being released.

Slots Game Providers

It takes a lot of creativity, talent, and effort to produce an outstanding slot. The competition is fierce and it’s hard to create a game that would stand out and get noticed. Some suppliers seem to be better at creating and promoting their products. On this page, we also offer the providers rating, which is tied to the slots rating.

In 2021, Endorphina seemed to be enjoying a lot of success as its games landed the studio in the first place. 44 slots that made it to the rating have earned the studio 4762 points. Pragmatic Play took second place, which wasn’t surprising considering the plenty of popular titles it offers and the extensive marketing efforts the developer took to boost the demand. Play’n GO earned third place with a range of well-known, time-tested hits.

Best Online Slots Bonuses

Slot fans can benefit a lot from the bonuses many casinos offer. The best bonuses aren’t the biggest ones but are those that also require low playthrough. Match deposit offers, when the amount of bonus credits proportionate to their deposit is credited, are the most common. Another popular option is free spins. Check out our Bonuses page to view dozens of promos.

Welcome Bonuses See all

Pros and Cons of Online Slots

You can have a massive collection of online slots and play them for free whenever you want or collect real payouts by wagering cash. There are all sorts of titles from low volatility classics to mega-million progressive jackpot games. Uncomplicated or innovative, they are all just a few clicks away on any device. The only disadvantage is that slots can be addictive, just like other casino games. But armed with the right responsible gambling tools, the tendency to overspend can be managed.

Online slots gambling is one of the most exciting casino experiences. It’s available to anyone owning a desktop or handheld device connected to the internet. The best slots are fun to play and usually remain popular for a long time.

FAQs
The higher the RTP, the more money players get back in the form of winnings. So, you should pick higher RTP titles.
To find out what games are the best, we use actual slots popularity data provided by our casino partners.
Look through the rating on this page to see the top-performing titles in 2021. There are time-tested hits as well as some more recent releases.
Casinos offer plenty of rewards such as welcome packages, reload bonuses, cashback and others.
All top games on this list can be played for free.