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Best Online Slots in 2021: The Top Slot Websites and Apps with High Payouts

Best Online Slots in 2021

Nothing beats the rush of playing a cutting edge slots gameYou want to use fair sites that have high payouts, good bonuses, and easy withdrawals.

To make things easy, we did the research and tested 25+ online casinos in the US and checked their slot games regarding bonuses, free spins, payout percentages, best slot payouts, volatility, free trials, and the terms and conditions tied to these online slots.

The result? A list of the very best online slots for having a great time while playing online.

Let’s have a look at the top slot sites before looking at the high RTP slot games:

  1. Best real money slot games: Red Dog Casino
  2. Variety of payment methods: Big Spin Casino
  3. Best mobile app: Super Slots
  4. Best game variety: Slots.lv
  5. Best bonus offer: Las Atlantis
  6. Best for spins promotion: Slots Empire
  7. Best bitcoin bonus: Ignition Casino
  8. Best updated slots: Cafe Casino
  9. Best crypto welcome bonus: Wild Casino
  10. Best bonuses and spins: El Royale
  11. Best progressive jackpot: Bovada
  12. Most reputable casino: BetOnline
  13. Best in sports betting: SportsBetting.ag

Which Individual Slots Had the Best Payouts?

The slots that payout the most are the ones with a high return to player rate. Always check that information on each slot before unlocking real money slots. The list below has a few examples for you and where to play them.

  • Achilles (98.56%) - available at Red Dog Casino
  • A Night With Clea (98.45%) - available at Slots.lv
  • Mystic Wolf (97.81%) - available at Ignition
  • Dim Sum Prize (97.18%) - available at Wild Casino
  • Guns ‘n’ Roses (96.98%) - available at Slots.lv

Ranking Methodology: How We Found the Best Slots Online

Reputation - Over and above everything else is the reputation of a casino. The online gambling world is full of scams, and it was our responsibility to help you sieve through the chaff.

Variety of Slots - We believe that the more, the merrier. Online casinos with many slots tend to keep players more engaged than those with just a handful of games. The online slots we reviewed met the threshold both in slot quality and quantity.

Payout Percentage - Payout percentages are the secret to maximizing your winnings. We narrowed our search to sites that offer the highest payout percentages on slots.

Slot Bonuses and Promotions - Bonuses and promotions are usually the hallmarks of a great gaming experience because we all want rewards in the end. Online casinos always have a program to entice players to their site. Our review tackled that aspect too.

User-Friendliness for USA Players - The online slot sites we settled for have some of the most easily navigable websites, and some can even be downloaded. The theme, background, and general site organization go a long way in helping players focus on what they signed up for.

Top Slot Sites Reviewed

1. Red Dog Casino - Best Real Money Slot Games

  • Attractive welcome bonus
  • Many slots available
  • Quality interface

Red Dog Casino will have you waggling your tail all the way to the online slots with attractive bonuses like the welcome bonus of up to 230%. They also have other offers for slots and spins. Players can try to win real money with the 200+ slot games available.

We were also impressed with the quality, functionality, and design of their user interface, like the 3D slot games. Incorporating technological advancements enables players to have an almost real physical appeal with the online slot games and casino and navigate the site painlessly.

However, keenly study the terms and conditions attached to each slot and ensure it is an adventure you want to stake your real money on. For instance, some slots do not unlock particular bonuses and progressive jackpots.

2. Big Spin Casino - Best for a Variety of Payment Methods

  • Great software providers
  • 3D slots included
  • Many payment methods offered including Bitcoin

For a relatively new casino, Big Spin’s attention to detail tells how it involved experts to piece everything together. With software providers like Betsoft and Nucleus, we get why the casino’s online slots catalog is every player’s favorite. New players can receive a 200% bonus of up to $1000 upon their first deposit.

Other than this offer, the casino has additional bonus funds on the slots, reputable software providers, 3D slots, and great graphics. The casino cold use more slot games in the progressive jackpots and reduce the cashout limit.

3. Super Slots - Best Mobile App

  • Comes from a reliable brand
  • Mobile app available
  • Bitcoin promotion available

We have confidently appended a seal of approval on Super Slot’s mobile app. The online slot site has over 200 5-reel slots for real money, and keeps releasing new ones monthly.

Other than the $6000 welcome bonus (with deposits and T&Cs apply), the casino has other promotions like the VIP reload, Slots Stampede, and Tell a Friend bonus.

We also recognized their user-friendly online interface, reputable software providers, fast payouts, several banking options, and good customer service.

We, however, felt that some of the bonuses had high wagering requirements. We advise players to check out such engagements keenly lest they get carried away with the superficial bonus details.

4. Slots.lv - Best Game Variety

  • Many slots available
  • Offer high RTP slots
  • Reputable software providers

Thanks to the advent of the internet, Slots.lv has an online presence, presenting over 3000 games and more than 400 slots. The phenomenal variety of games ranges from the classic 3-reeled online slots to the current and more exciting 3D 5-reeled video slots.

They have partnered with game providers like Net Ent and RTG, which means you are assured of new games and classic ones. The gaming experience at the casino is likely to be more lit since they keep updating new games on their website.

With a payout rate of approximately 98.45% in many slots, Slots.lv is popular site for slot games. The online slot also has attractive daily jackpots and a user-friendly website. It, however, needs to create a mobile app and expand its banking options.

5. Las Atlantis - Best Bonus Offer

  • New casino
  • Instant play and download option
  • User-friendly website

Las Atlantis is a brand new online casino launched in 2020, yet it basically has everything under one roof. Players want an online casino with various games, quick payout, several payment methods, a user-friendly website, good bonus funds and promotions, and an overall excellent gaming experience.

The online casino is compatible with every device, has an instant play option, and is also downloadable. With game software providers like ViG AND RTG, your gaming preferences are well thought through. They have an attractive welcome bonus offer. However, if they reduced the $150 minimum withdrawal, more players would stake on real money slots.

6. Slots Empire - Best for Spins Promotion

  • Attractive bonus that includes spins
  • Mobile compatibility
  • Many different slots available

As the name suggests, the casino has put great emphasis on slots and has other games like tables and cards. The casino has a 220% welcome bonus on a deposit of up to $1000, plus 45 free spins on Spring Wilds and other promotions like the Game of the Month.

In general, the casino is aesthetically pleasing, laced with the visually impressive Ancient Roman Empire theme. The welcome bonus has strict terms which players should take into consideration.

7. Ignition Casino - Best Bitcoin Bonus

  • Great for playing with Bitcoin
  • Mobile-friendly
  • Good for slots and poker

This casino has maintained a good name and has addressed all areas to a fault. It is reliable, offers great games, has partnered with quality software providers, and has an easily navigable website.

Ignition Casino has so much to offer, including a fair welcome bonus alongside other reload bonuses. When you deposit using bitcoin, Ignition offers an attractive match bonus which you can choose to accept

Should the casino introduce an e-wallet and extend the mobile games, we are confident that its players will be hard-pressed to find a more engaging online casino.

8. Cafe Casino - Best Updated Slots

  • Many casino games
  • Attractive bonuses
  • Fast payout

Café Casino is the plug for any player who is in it for both fun and rewards. They start you off with a match bonus on the initial deposit, then keep it rolling with more perks like weekly promos, cash bonuses, tournaments, and cashbacks.

They currently have more than 300 casino games and frequently update the list to accommodate distinct player preferences. They also process payout rates quite fast. If only they could expand their territory to accommodate players beyond the USA.

9. Wild Casino - Best Crypto Welcome Bonus

When you make your first deposit using their approved cryptocurrency methods, you get a welcome bonus that goes all the way to the fourth deposit, amounting up to $9000. Ensure you use the correct bonus codes. There are more incentives even without using cryptocurrencies, like the 5% bitcoin boost, $5000 welcome bonus, 10% weekly rebate, the VIP reload, Hump day special, among others.

Remember, with each offer, terms and conditions apply. The casino has a well-organized user interface resting on a cool background, where players can easily see the latest games and the most popular ones. The casino could use more slot games and introduce live chat and phone support.

10. El Royale - Best Bonuses and Spins

  • Bonuses on different deposits
  • Can play on any device
  • Fast payouts

El Royale is not your average RTG online casino. The bonuses are so many that they never seem to deplete. The casino also offers a fair amount of slots.

First, there is the 240% bonus and 40 free spins on your initial deposit deal, then the 260% on the second deposit. Then the 225% bonus alongside 20 free spins and many more.

While these many offers are enticing, they can also be overwhelming, and you may miss out on essential details. Hold that excitement and read through each bonus before you become over-ambitious and end up losing it all.

11. Bovada - Great Progressive Jackpot

  • Long-standing brand
  • Attractive welcome bonus
  • Quality slot games

In these murky waters, Bovada has somehow found a way to navigate and stay afloat for 15 solid years, which is no mean feat in the gambling industry.

It still has a great selection of games from top-notch providers and a generous welcome bonus alongside other promotions like the progressive jackpot. Their customer service is reliable, and the website is organized well enough to serve the purpose.

Plus, aren’t we all drawn towards online casinos that allow for free trials? Slot lovers have more than 180 quality games from RTG, Betsoft, and Rival. Generally, everything about the casino was thought through. We noticed that online casino only had a web-based version, and players incur charges when depositing.

12. BetOnline - Most Reputable Casino

  • Fast payout
  • Many different types of games
  • Crypto bonus available

BetOnline casino understands that building a reputation takes 20 years while destroying it takes just 5 minutes. They have managed to keep a clean name in the industry and are still thriving.

Their bonuses and list of games are average, but when they promise something, they deliver. The online casino has hundreds of slot games and a solid sportsbook that has lasted almost a decade.

They have an efficient payout process, several payment options, and a mobile casino. We, however, felt that the rollover requirements were relatively high. Please read the terms and conditions keenly before unlocking any promotion.

13. SportsBetting.ag - Best in Sports Betting

  • A selection of 3D video slots
  • Several bonus offers including bitcoin
  • Many types of games

If it’s not in SportsBetting casino, you’ll likely not find it anywhere else. There is an endless list of e-sports, horse racing, casino games, video slot, and poker. The casino offers motivations like welcome bonuses, bitcoin boost, and other weekly and monthly promotions.

We were pleased to realize that the casino had put great emphasis on casino games just as it had with the sportsbook.

You will have a great time with the 3D video slots. The regular online slot games are a bit underwhelming compared to the 3D category.

The games are from big-shot game providers like GGL, Betsoft, and Connective Games. It is also a one-stop shop for all products. The poker room needs more action, though.

FAQs and Guide to Online Slots

How Do Online Slots Work?

The concept is similar to what you would do if you were physically in a casino. You spin the wheels intending to align identical symbols along or across the reel.

When playing online, you have many games and payment methods to choose from, bitcoin gambling sites will let you gamble with cryptocurrencies for example.

Are Online Slots Rigged?

No, they are not. Just because it is online does not mean the results on games such as slots and online poker are being doctored in the background.

For these casinos to be passed as fair and legit, they must satisfy the authorities that their games are won on probabilities, meaning the results are random. Always check if the casino is approved lest you cry foul.

What Is RTP?

This abbreviation means ‘return to player’. That means that RTP is the percentage of money that is returned to the players by the slot machines. Player’s always want to aim to play slots that have the highest RTP because it means they have better odds. Odds are important for many other games such as with choosing top sports betting sites

What Is the Best Slot Machine to Play Online?

Basically, the terms and conditions will guide you to choose a slot machine that works best for you and that has the most favorable conditions.

When playing slot machines, select online slot games with reasonable bonuses and promotions, a high RTP percentage, and cool themes.

What Slot Softwares Are the Best?

At this moment, these sites represent the best software options for online slots:

  • NetEnt
  • Quickspin
  • Microgaming
  • Play’n Go
  • Playtech
  • Nextgen Gaming
  • IGT
  • Real Time Gaming
  • Aristocrat

Which Bonuses and Promotions Can I Get When Playing Slots?

Most casinos use these bonuses to attract and retain players. The most common one is the welcome bonus, a reward that players get when they make the first deposit. It usually comes as free spins or bonus funds, or both.

Many of the best online casinos have a one-time welcome bonus, while others break it down to several deposits after the first one. Other promotions include offers to players after the welcome phase ceases. They come in the form of progressive jackpots, VIP loyalty packages, weekly or monthly bonuses, trips, tournaments, etc.

What Are Free Slots?

These are slot games you can play without depositing or using real money. Casinos always give this offer just for fun or for players to get acquainted with the games before playing for real money.

What Are Real Money Slots?

These are slots you get to play after depositing some money in your account. While everything works on probabilities, you can sometimes get lucky and win some cash when you play real money slots.

If this area excites you, go for the progressive jackpots and slots with high RTPs.

How to Choose a Slot Casino?

Most importantly, ascertain the legitimacy of the casino you choose to engage with. There are scams all over. Once you get that out of the way, check the payout percentages of the slots you are interested in.

These are the amount of wagers the casino allows you to withdraw after winning. The higher the payout percentage, the more you’re likely to get back. Please conduct due diligence in this area if you are playing real money slots.

Also, if you play other games you might, for example, choose sports betting sites, bingo sites, or CSGO gambling sites.

Related reading: best online casinos in canada

Have Fun Playing Slots Online!

With the list of best online gambling sites, we are confident that you will make the right decision on where to play your slots.

We also believe that you can now make informed decisions on slots for real money, an area players miss on big time. If you found this review useful, we are delighted to have been of help. Good luck and play responsibly.

If you suffer from a gambling problem or suspect somebody you know does, then we strongly suggest that you call Gambler’s Anonymous at 1-626-960-3500 to talk with an advisor for help and to make gambling safer for you or your loved ones.

Underage gambling is an offense, all sites are 18+ ONLY. Gambling can be addictive, please play responsibly and only bet what you can afford. Casinos listed on our site may not be available in your region. Check your local laws to ensure online gambling is available and legal where you live.

Visit these organizations for free gambling addiction resources:

  • http://www.gamblersanonymous.org/
  • http://www.ncpgambling.org/
  • http://www.gamblingtherapy.org/
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