Top Online Slots Providers
Today, there are more game developers than ever competing in the iGaming space. Thankfully, for players, this means you have more choice than ever before when it comes to choosing online slot games - and new slot releases are hitting online casinos daily! In this guide, we’re going to take a look at the world’s top online slots providers. We’re going to talk a bit about the companies, their most popular games, and any innovative features they’ve brought to market.
NetEnt
NetEnt is arguably the most well-known and popular software provider in the online gambling world, and this Swedish-based company is behind some of the most successful video slots in history. Founded in 1996, NetEnt has grown from a company of just three employees to a team of over 1,000 today, with offices worldwide, including the USA, Sweden, Malta, Poland, and Gibraltar.
Starburst Slot
Starburst is known as the slot that launched NetEnt to the top as an online slot developer. Being released back in 2012, it’s still one of the top online slots among slot players due to its low volatility and unique paylines, with winning combinations both from left and right. Starburst is a true classic, offering low volatility that players should give a try.
Starburst Slot Features:
- Free Spins
- Respins
- Expanding Wild
- Wilds
- Scatter Symbols
- Pay Both Ways
- Theme: Classic
- Volatility: Low
- Game Type: Avalanche
- Release Date: 2012-01-01
- RTP (Return to Players): 96.09%
- Reels: 5
- Min Bet: 0.1£
- Max Bet: 100£ (in UK 5£)
- Provider: NetEnt
- Paylines: 10
In their 20+ years of operation, NetEnt has developed over 300 casino games and was one of the early pioneers in live gaming. In 2020, they were acquired by Evolution Gaming for a whopping € 1.8 billion.
NetEnt’s Top Games
NetEnt has been responsible for a large number of hugely successful games. Their older games - including Evolution, Wonky Wabbits, Blood Suckers, Jack and the Beanstalk, and Lights - saw huge commercial success, although most have now been retired.
Starburst is arguably the game developer’s most successful release. Despite its basic design, the game is available at almost all online casinos, allowing players to win up to 500 times their stake through an exciting re-spin feature.
Mega Moolah
Microgamings Iconic Mega “the Millionaire Maker” Moolah takes you on a Progressive Jackpot safari journey to the plains of Africa.Mega Moolah consists of a mini, minor, major and a Mega Jackpot often reaching over £10 Million
Mega Moolah Features:
- Wilds
- Free Spins
- Autoplay
- Multipliers
- Game Type: Jackpot Games
- Volatility: Medium
- Release Date: 2006-01-10
- RTP (Return to Players): 88.12%
- Reels: 5
- Min Bet: 0.25£
- Max Bet: 6.25£ (in UK 5£)
- Provider: Games Global
- Paylines: 25
Dead or Alive (the original, and DOA II) are also huge successes for the company. The latter allows you to win up to 111,111X your stake - and this is some of the most significant win potential you’ll ever see from a non-progressive jackpot video slot!
Innovative Features
Throughout the years, NetEnt has developed several innovative features. Firstly, they had their “OneTouch” games. These were mobile-friendly versions of their most popular video slots, allowing players to enjoy the action from their mobile devices.
NetEnt has also produced some of the world’s most popular progressive jackpot games, including Mega Fortune and Divine Fortune - and they also operate three live casino games from their custom-built live gaming studio.
Microgaming
Despite a decline in popularity over the last few years, Microgaming remains one of the leading contenders in the online gambling world. They’ve produced some of the most successful video slots in history, and were also well-known for their Viper poker software client.
Microgaming’s Top Games
Over the past two decades, Microgaming has developed hundreds of casino games, including video slots, table games, and instant-win games. Immortal Romance is one of their most popular slot games. This Twilight-esque-themed game offers win potential of more than 11,000X and contains four exciting bonuses and features, including the renowned Wild Desire, where all five reels can transform into wild reels.
Dragonz, Thunderstruck II, Mega Moolah, Jurassic Park, Avalon II, Retro Reels Extreme Heat, Terminator 2, and 8 Acrobats are other notable releases from the software provider.
Innovative Features
Microgaming’s most innovative feature is its WowPot mechanic. WowPot is a four-tiered online progressive jackpot that has a minimum seed of a whopping 2 million euros - and there’s no limit on how big it can grow. WowPot progressive jackpots can be found in games like Mega Moolah, Wheel of Wishes, Book of Atem, and Ancient Fortunes.
Some of Microgaming’s older games - including classics like Immortal Romance and Thunderstruck II - contain what are known as achievements. As players progress through the game, they “unlock'' different awards - achievements. Unfortunately, these achievements don’t have any monetary value for players, so they’re more symbolic than anything else.
Nolimit City
Nolimit City is another Swedish-based game developer that was founded in 2013. Despite failing to achieve early success, the provider has, over the past couple of years, risen to become one of the largest names in the online gambling world - and they now have offices in Malta, India, and Sweden. They are licensed by the UKGC and the MGA, among others, and are known for their highly volatile video slots.
Nolimit City’s Top Games
Nolimit City’s games are usually built around very volatile maths models. Deadwood is one of their most popular games - allowing players the chance of winning tens of thousands of times their stake from a thrilling free spins round - and Deadwood II was recently released as a sequel.
Other popular games from Nolimit City include Legion X, xWays Hoarder Split, San Quentin, Book of Shadows, Mental, and Tombstone RIP.
Innovative Features
Nolimit City developed the xWays and xNudge mechanics, both of which are now registered trademarks of the company. xNudging wilds, when appearing in their games, “nudge” their way up or down, with each step increasing a multiplier by +1.
xWays - depending on the game - usually allows players to unlock an additional number of ways, increasing the win potential significantly. A bonus buy is often available with Nolimit City’s games. This will enable players to purchase direct entry to the main bonus round for a fixed cost.
Play’n Go
Play’n Go is one of the oldest companies operating in the online gambling world. Established in 1997, this Swedish-based company is licensed by online gambling regulators worldwide and focuses on developing high-quality, great-looking casino table games, video slots, and multiplayer games.
All games developed by Play’n Go are fully mobile-optimised and can be played on all iOS and Android devices.
Play’n Go’s Top Games
Over the years, Play’n Go has developed a range of very successful games, but none have seen the same levels of success as their critically acclaimed Book of Dead. This 5-reel, 3-row slot takes place in ancient Egypt, and during the bonus round, players can win up to 5,000X their stake thanks to special expanding symbols.
Reactoonz is another highly successful video slot from Play’n Go, utilising their recharge mechanic. Matching 15 pink symbols during the base game can award payouts of more than 1,500X.
Other popular games from Play’n Go include Legacy of Dead, Rich Wilde and the Tome of Madness, Rise of Merlin, The Sword and the Grail, Hotel Yeti-Way, Moon Princess, Rise of Olympus, Fire Joker, and 7 Sins.
Innovative Features
Play’n Go developed a cluster mechanic that can be found in many of their most popular video slots like Wild Frames and Reactoonz. Here, wins are formed when you land five or more matching symbols in a cluster - rather than on an active payline - and these games unlock special bonuses and features when you collect enough symbols.
In an attempt to compete with the Megaways mechanic, Play’n Go developed Dynamic Pathways. This adds extra rows (ways) to some of their games during the bonus round. Coils of Cash is one of their top games to utilise this innovative feature, and extra ways are found when landing a symbol underneath a matching symbol; the bottom symbol then “splits” into two, doubling the number of ways for that reel.
Pragmatic Play
Pragmatic Play is one of the newest game developers to enter the online gambling world - established in 2015. Despite their young age, they’ve grown exponentially. Today, they’re one of the most prominent game developers in the iGaming industry, with a large portfolio of mobile and crypto-friendly casino table games, video slots, and live dealer games.
Pragmatic Play is licensed in over 20 jurisdictions, including the UK, Malta, and Gibraltar, and their games are available at thousands of different online casinos. All of their casino games come in 31 different languages, and online casinos can choose whether to use fiat currencies or cryptocurrencies.
Pragmatic Play’s Top Games
Pragmatic Play is known for ultra-high-variance games like Madame Destiny and Peking Luck - both of which offer players the chance to win more than 100,000X their stake!
However, in terms of their most played games, Big Bass Bonanza is likely one of the top. Featuring a mechanic similar to that of the iconic Fishin’ Frenzy, Big Bass Bonanza has a unique twist; each time the collecting fisherman symbol lands, you progress along a metre. After collecting enough of the fisherman symbols, you’ll be awarded another 10 free spins - although this time, there’s a 2X multiplier attached to all wins!
The Dog House is another really successful video slot from Pragmatic Play. The bonus round awards up to 27 free spins, and during the free spins, sticky wild multipliers can land. This can multiply your wins up to 27X - and all sticky wilds lock in place for the duration of the free spins bonus round.
Other popular slots from Pragmatic Play include Gates of Olympus, The Dog House Megaways, Wolf Gold, Floating Dragon, Wild West Gold Megaways, and Gems Bonanza.
Innovative Features
Pragmatic Play’s games are well-known for their innovative features. The game developer is also known for its branded games, and in 2020, it released its first branded video slot, Peaky Blinders. The game developer also purchased the rights to use BTG’s Megaways mechanic. They’ve since used this mechanic in many of their releases, including The Dog House Megaways and Big Bass Bonanza Megaways.
The game developer started operating its live dealer casino two years ago. While they’re not as large as Evolution Gaming, Pragmatic’s live iGaming products can be found at a handful of reputable online casinos, and the number of sites offering their live dealer games continues to increase.
Red Tiger Gaming
Red Tiger Gaming is another young game developer, having launched in 2014. While they aren’t as large as some of the other game developers we’ve examined on this page, Red Tiger Gaming is a leading figure in the iGaming industry, and their games can be found at thousands of online casinos.
Today, the provider offers more than 250 casino games - most of which are video slots - and has recently partnered with other game studios, such as BTG, allowing them to incorporate various game mechanics and features.
Red Tiger’s Top Games
Rainbow Jackpots was one of the game developer’s first games to see mainstream success - and it utilises their unique “randomly triggered base game feature” mechanic. During the base game, the Irish leprechaun can appear and add wilds to the reel, award a winning spin, and trigger either of the two bonuses and features. Several of the software provider’s other games followed the same format, including Dragon’s Luck and Lucky Halloween.
Other popular games from the provider include Gonzo’s Quest Megaways, Dynamite Riches, Laser Fruits, Gems Gone Wild, Mystery Reels, and Reel King Megaways.
Innovative Features
Red Tiger Gaming was a pioneer in the daily drop jackpot technology, and many other game developers, including Playtech, now use a similar mechanic in their games. If you play a “Must Drop Daily Jackpot” game from Red Tiger, there will be three progressive jackpots - one of which must be won on the same day. There’s also a larger, standard progressive jackpot, which continues to grow until a player hits the combination required to win it
Best Slot Sites 2025
Now that you know the best online slot game providers in the UK, how about trying some of them out? Finding a safe and reliable online casino shouldn't be too hard. However, we do understand that sometimes it can be challenging to know which new slot site to choose. We have hand-picked some features and new slot sites below to help you out. These UK casinos are reputable operators that hold full licenses and have a proven track record of providing a safe and entertaining gaming experience. You will find plenty of new games and slots from the aforementioned slot providers - and much more!