Top 8 Best 4K Ultra HD Smart LED TVs in 2021 Reviews

Indoor entertainment can be fulfilled in many different ways. For most of us, watching the TV is certainly one of the best ways. Televisions were mainly invented to provide information and keep viewers up to date, but things have changed fast to the extent that TVs are now one of the main sources of entertainment. Nevertheless, not all televisions have the features needed for enhanced performance. That is where a 4K smart LED TV comes into play.

These TVs are the latest brand, meaning they have everything you have ever wished for in a television. They deliver 4 times the resolution of 1080p full HD, and this allows them to produce clear pictures. They also have multiple inputs, including HDMI, headphone jacks, USB ports, Ethernet, and more to help you connect your devices for great entertainment. In the following top 8 best 4K Ultra HD smart LED TVs reviews, we highlight only the best brands for effortless buying experience.

Table Best 4K Ultra HD Smart LED TVs

1. Sony XBR65X900F 4K Smart LED TV

1. Sony 2017 Model 55-Inch 4K Smart LED TV (XBR55X900E)


The Sony XBR65X900F is designed to let you enjoy quality entertainment right inside your house. It has 5X the dynamic range and full-array backlight, so it can offer incredible contrast. In addition, this Android TV measures 48.4 inches wide by 27.9 inches high by 2.4 inches deep, and it features an incredibly slim design, so it can fit in even the tightest spaces. The full-array local dimming technology not only gives amazing contrast but also ensures enhanced brightness. This high performing LED TV is also equipped with a 120Hz refresh rate (native) plus Motion flow XR to give you fast-moving action scenes without a motion blur. Its inputs include four HDMI, one USB3.0, two USB2.0, one Composite, and one Component/Composite Hybrid.

Key Features
  • 4K HDTV delivers stunning pictures with a high dynamic range of details and color
  • Equipped with X1 extreme processor that allows for enhanced customization
  • Triluminos premium display ensures clear on screen action
  • Compatible with Alexa for easy voice control
  • Smart TV makes it easy for you to stream videos
  • Delivers stunning 4K crystal clear pictures
  • Advanced sound performance
  • Excellent viewing angles
  • None worth mentioning

2. Samsung Electronics UN43MU6300FXZA 4K Smart LED TV

2. Samsung 2017 Model 40-Inch 4K Smart LED TV (UN40MU6300)


This premium quality 4K Smart LED TV delivers a colorful HDR (High Dynamic Range) picture that enables it to redefine your viewing experience. It has a highly functional user-interface and boasts a 40-inch screen, so you can clearly enjoy your favorite shows and movies. Additionally, the Samsung 2017 Model 40-Inch 4K Smart LED TV comes equipped with a Motion Rate 120, which allows for smooth action on fast-moving content. It also has One Remote that automatically detects and controls all the connected devices. The TV will bring you to a world of reality by giving you the opportunity to experience vibrant and pure color. It has 4X more pixels compared to Full HD, meaning it gives 4X the resolution.

Key Features
  • Delivers 4 times more pixels than Full HD television, boosting your viewing experience
  • Impressive refresh rate eliminates drag in high action pictures
  • Impressive 3840 by 2160 pixels deliver excellent viewing experience
  • The 20W Dolby Digital Plus output ensures excellent sound
  • It has a slim, elegant design that blends well with your interior décor
  • Good connectivity thanks to the three HDMI ports and two USB ports
  • Delivers crystal clear images
  • Ideal for gaming, watching videos and football
  • The remote has very few buttons

3.TCL 55S405 55-Inch 4K Ultra HD Roku Smart LED TV

3. TCL 2017 Model 55-Inch 4K Smart LED TV (55S405)


TCL (The Creative Life) is one of the best-selling TV brands across the globe. They produce high-quality 4K Smart LED TV like the TCL 55S405 2017 Model. This television comes with a user guide that provides a guideline on how to use it. It also has several inputs including three HDMI 2.0 with HDCP 2.2, Ethernet, Optical Audio Output, one USB, Composite, and RF. Well, all these inputs make it extremely easy to use with external devices like computers, Android phones, tablets, and more. The TV also has a headphone jack for private listening. Its direct-lit LED delivers amazing picture quality, while its 120Hz rate will allow you to see fast action scenes without blur.

Key Features
  • Smart functionality brings you to more than 4,000 streaming channels
  • Combines 4K Ultra HD picture with high dynamic range details to offer a lifelike picture
  • Advanced 120HZ refresh that ensures no motion blur when watching fast moving action scenes
  • It is compatible with Google assistant and Alexa
  • Have excellent contrast ratios
  • Includes many ports for easy connectivity
  • Has a fast, responsive user interface
  • Sleek, modern design looks great
  • Convoluted setup and options

4.TCL 55S517 55-Inch 4K Ultra HD Roku Smart LED TV 

4. TCL 2017 Model 55-Inch 4K Smart LED TV (55C807)


Sleek and elegant, the TCL 55C807 model is the latest model of smart TVs. It is simplified to let you enjoy unending entertainment. It also boasts the latest in 4K technology and design, so it can remain relevant in the modern world. Ideally, the TCL 2017 Model 55-Inch 4K Smart LED TV has Dolby Vision HDR, which enables you to choose from over 4,000 streaming channels with 450,000 TV episodes, movies, kids & family, foreign language, science & tech, fitness, food, sports, news, and more. The edge LED backlighting has a dynamic contrast that produces deep blacks and outstanding picture quality. You will love the TV’s several inputs including Ethernet, Optical Audio Out, Composite, RF, 1 USB, and 3 HDMI 2.0 with HDCP 2.2.

Key Features
  • Pairs 4K ultra HD picture clarity with impressive Dolby Vision high dynamic range
  • 120Htz refresh rate ensures amazingly low input lag, making it great for watching and gaming
  • Smart functionality gives you access to thousands of streaming channels
  • The remote comes with a built-in air mouse for better control
  • Delivers 4K viewing at an affordable price
  • The surround sound quality is remarkable
  • Wide viewing angle
  • Supports Google Assistant and Alexa
  • Contrast Control Zones is not included

5. Element Fire TV Edition 50-Inch 4K Smart LED TV

5. Element Fire TV Edition 50-Inch 4K Smart LED TV


This affordable smart TV from Element gives you a chance to experience 4K UHD picture quality; thanks to its more than 8 million pixels. It has a direct-lit LED screen that delivers deep contrast, stunning clarity, and brilliant colors. As if that is not enough, the screen has significantly reduced the motion blur with its refresh rate of 60Hz (native) and 120Hz (effective). This TV also comes equipped with the Fire TV experience to allow you to enjoy innumerable channels, Alexa skills, and apps. Its included Voice Remote has Alexa, which enables you to control live TV playback, search for TV shows, launch apps, switch inputs, play music, and control smart home devices, among others. The Element Fire TV Edition Smart TV is one of the best TV brands you will ever come across.

Key Features
  • Smart TV that seamlessly integrates streaming and live over-the-air content
  • 4K UHD enable you experience lifelike picture quality with over 8 million pixels for stunning clarity
  • The included Voice Remote is compatible with Alexa allows you to control live TV playback with your voice
  • It has a slim bezel and a brushed metallic finish gives your space a modern touch
  • Sleek , modern design
  • Offers excellent picture and sound output
  • Have numerous ports, allowing you enjoy stress-free connectivity
  • Compatible with Google Assistant and Alexa
  • Lower contrast than OLED

6. LG OLED55CXPUA Alexa Built-In CX 55-inch 4K Smart 

7. LG 2017 Model 55-Inch 4K Smart OLED TV (OLED55C7P)


Equipped with webOS 3.5, the LG 2017 Model 55-Inch 4K Smart OLED TV (OLED55C7P) will let you access your favorite content and apps. The TV also boasts 4K Ultra high-definition picture clarity with the color, contrast, and detail of HDR (High Dynamic Range) to ensure a more lifelike picture. Besides, there are individually lit OLED pixels that achieve the ultimate contrast for exceptional picture quality. This TV does not use a backlight, and this gives it deep blacks as well as makes it super thin. It has several inputs including one RS232C (Mini Jack), one Ethernet, one Composite, four HDMI, one RF, three USB, and one Optical.

Key Features
  • It combines 4K with the latest OLED pixels that emit their own light, ensuring for flawless black, intense color and striking picture.
  • Comes with the LG’s fan-favorite webOS platform that allows for fast movie streaming
  • The advanced a9 Gen 3 AI Processor 4K ensure a smooth, clearer and more dynamic pictures
  • Includes NVIDIA G-SYNC and Free Sync that give you an edge with less and, high refresh rates, for a smooth gameplay
  • Low input lag makes it great for gaming
  • Offers Bluetooth, LAN and Wi-Fi connectivity
  • Excellent picture and sound quality
  • Decent screen size makes it ideal for home use
  • Multitasking does not work for all apps.

7. VIZIO Model 50-Inch 4K Smart LED TV 8. VIZIO 2016 Model 50-Inch 4K Smart LED TV (D50u-D1)


The VIZIO D50u-D1 2016 Model has more than 8.3 million pixels and 4 times the resolution of 1080p full HD, meaning it can deliver pictures in absolute clarity. It also has an ultra HD streaming support that allows it to stream movies and shows. In addition, the TV has a full-array LED backlight with 12 active LED zones to improve clarity. Moreover, it boasts a dual-band 802.11ac, which offers up to 3 times faster Wi-Fi. Its black color will perfectly blend with the existing décor, while its 50-inch size gives you a large viewing platform. This smart TV also comes equipped with a full-screen app launcher to make sure you have an easy time finding and organizing your apps.

Key Features
  • The revamped user interface gives you access to more apps
  • Wi-Fi and LAN connectivity makes it easy to connect
  • Has a screen app launcher that enables you to organize your apps easily
  • Excellent 120 GHz refresh rate eliminates lag for fast action scenes
  • Sleek bezel design looks attractive
  • Large screen with decent angle viewing
  • Slick, easy-to-use operating system
  • Smart TV with Ultra HD streaming support
  • It doesn’t support the connection of Bluetooth speak

8. SAMSUNG 55-inch Class QLED Q60T Series

9. Samsung 2017 Model 55-Inch 4K Smart QLED TV (QN55Q7F)


The user manual that comes with the Samsung Model 55-Inch 4K Smart QLED TV  makes it (the TV) very easy to operate and even to troubleshoot a problem. Furthermore, the TV has stunning blacks, which reveal secrets in the shadows. It also comes with a Samsung Smart Remote that allows you to effortlessly access your favorite content as well as control connected TV devices. The curved boundless 360-degree design enables this television to perfectly blend with your living room, while the clean-brushed metal back finish looks beautiful from every angle. Moreover, this TV comes with the Samsung’s Invisible Connection optical wire that allows you to cleanly connect your devices. A smart, beautiful unit is worth bringing home.

Key Features
  • Direct full array backlighting delivers pure whites and deep blacks
  • Advanced object tracking sound delivers better sound quality
  • Quantum processor 4K ensures clear, high definition pictures
  • Alexa built-in to allow you to search for movies and control your smart home devices using your voice
  • Sleek, gorgeous design with a large screen
  • Comes with various connectivity ports
  • Impressive motion handling makes it great for watching fast action movies
  • Delivers a vibrant picture quality
  • It is a bit pricey


It is important to embrace the ever-changing technology, so you do not miss many things. One way to make sure you are up to date with the latest technology is to have one of the above 4K Ultra HD smart LED TVs. These units produce clear and smooth pictures on a consistent basis to make sure you are fully immersed. Besides, they are from notable brands in the world, including LG, Sony, and Samsung, for worry-free buying experience.


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