Nutri Ninja Blender Duo 1200-Watt Auto-iQ (BL642) Review

ninja-auto-iqThe Nutri Ninja Personal and Countertop Blender is a very popular machine that appeared on the market not a long time ago. It comes with personal blender attachment with selection of containers and  recipe books included in the package.

Are you also interested in alternative options? Check here our articles the Best Blender Under the $200 , Dash Chef Series Digital Blender vs Ninja Blender with 1200-Watt Auto-iQ BL642 and Cleanblend Blender vs Ninja Blender with 1200-Watt Auto-iQ.

Functionality and Versatility

Smoothie: The XL 72 oz. pitcher blends quite chunky drinks even from soft fruit and vegetables no matter how many minutes it was run and what speed and settings were used. The blade constructed the way that it blends only 1-inch ingredients at the bottom. So the manual mixing is necessary helping to create the proper vortex. This machine also not able to pulverize strawberries, blackberries seeds and leave them intact as residues. No wonder, it will not handle any decent green smoothies.

However, the single-serve attachment with the pro extractor blade (single serve blade assembly) is able to produce decent quality smoothies and will easily process hard ingredients like the carrot of leafy vegetables for green smoothies. It usually will grind strawberry and other seed without any residues left.

Juice: The Ninja Blender with 1200-Watt Auto-iQ will not make classic textbook juice as it does not include any juice attachment and will not separate fiber from the liquid. However, the single-serve attachment is able to produce decent reasonably smooth smoothies aka “whole juice”.

Frozen ingredients/desserts: Both the main container and single serve attachment are designed to shave ice producing snow cones and able to make quite decent frozen desserts like frozen yogurts. However, sometimes the low-quality plastic containers may develop cracks due to the heavy load caused by the ice processing.

Pureeing: All four models of this machine are able to puree cooked vegetable quite well but will not make smooth puree from the raw ones. The BL482 and BL482Z models that equipped with the food processing attachment are capable performing the even wide range of recipes such as mash potato, hummus, pâté, baby food and others, however, some recipes will require adding some liquid for easy processing. It also may require stopping machine occasionally for mixing the ingredients and scrape the walls for the better vortex to avoid machine overheating.

Soup/ hot ingredients: This machine is not designed to cook the hot soup from the cold as Vitamix and other high-end blenders, but it can puree the soup ingredients (a bit grainy though) if you cool them before the processing. This machine according to user manual can handle the temperature up to 180°F/82°C. So it also will not suit for making bulletproof coffee.

Chopping/food prep: The Ninja Blender Duo with Auto-iQ will perfectly chop nuts and veggies for salsa, dips, salad dressing, sauces and salad mixes using the 72 oz. pitcher or the single serve cup. The BL682 and BL682Z models that are equipped with the food processor attachment are also designed to perform the wider variety of tasks such as meat grinding, grating cheese, and bread crumbs.

Nut milk: The XL 72 oz. container with total crushing blades is not suitable for making nut milk. However, the single serve cup with pro extractor blade is quite capable making a reasonable nut milk after sieving it through a nut bag.

Nut butter: This machine is capable making nut butter using the XL jar, however, the lack of tamper will make this task the time and labor consuming with the not very smooth final result. The BL682 and BL682Z models food processor bowl, although with some efforts but will produce decent quality nut butter.

Dough/batter: The BL642 models is not designed to make any cookies batter or bread dough. However, the BL682 model that comes with food processing bowl and dough hooks are perfect for kneading all type of dough and making the variety of batters and cake mixes.

Grinding/milling: The Ninja Duo with Auto-iQ is not designed for grinding coffee beans and milling grains. But it is possible to mill herbs or soft grains like oats using XL pitcher or food processor attachment. The single serve cup will perform the task with the slightly better result.

This machine is capable performing a variety of task, however, only BL 482 and BL482z will do the food processing tasks including processing heavy mixture like dips, pates, and humus while BL462 is designed for fewer functions.

Speed Settings and Programs

The Ninja with 1200-Watt Auto-iQ BL642 machine control panel comes with 9 buttons – three speeds (Low, Med, and High), pulse function, two pre-sets for XL pitcher (Frozen Drinks/Smoothies and Puree) and other two 2 pre-sets for single serve attachment (Blend and Ultra Blend). The preset will automatically stop operation at the end of the cycle. The timed operation may be stopped with the press of power button. The control also equipped with the time which shows the time from the start of the program or from the beginning of the timed operation.

The food processor attachment is operated only using any of three speeds (Low, Med, and High) or pulse function. For example, the food processing bowl with kneading hook is supposed to be used on low speed for kneading dough or mixing batter. The mincing and grating tasks could be done on pulse function and chopping may be performed using any of three 3 speeds.

Ease of Using and Cleaning

Operating: Assembling this machine when using XL pitchers for operating is not really straightforward. First, the stacked blade system should be carefully placed into pitcher onto the drive gear, the blade system is loosely fitted onto the drive gear. Then the pitcher should be aligned the right way with the base and locked properly otherwise the blender will not run. Only after these steps, the user can add food what is not very handy as the blade shaft occupies some space inside of pitcher and make it difficult to fill with ingredients, so they must be chopped into smaller sizes to fit the pitcher. In addition, the lid on the XL container is quite complicated to lock and must be done the right way, otherwise, the blender again will not run. After completing all this complex procedure the blender is ready for running.

The blender is not equipped with the tamper, so the adding extra ingredients or to mixing the content of pitcher must be done manually every time what includes also opening and closing the lid. It also must be mentioned that the XL pitcher blades are very sharp and they should be handled with extra care in order not to injure yourself.

The assembling the Nutri Ninja single serve attachment is quite easy. The user first fills the cup with ingredients, screw the blade assembly with the cup tightly enough otherwise it may leak, and place it upside down on the base unit, then turn clockwise until it clicks. Now user can press the power button and choose the needed speed or program. The opening the lid after operation must be done with care as it tends to build pressure during the blending and may explode content when it unscrewed (like opening a bottle of Champaign).

Cleaning: All the Ninja Blender Duo with Auto-iQ parts are dishwasher safe (although may develop some minor damage after dishwashing), so they are easy to clean if you plan to do it in a dishwasher.

However, it is not an easy task for those who prefers hand cleaning. The stacked blade system is very sharp and could injure the user if not handled with extra care. The single serve and food processor attachment parts are no problem to clean by hand. The single serve cup also could be washed with the self-cleaning procedure – add half way water in the cup with few drops of soap and run the blender for 30 seconds. 

Base Unit and Motor Power

The Nutri Ninja with 1200-Watt Auto-iQ BL642 comes with very powerful 1200 watts at peak motor and should be able to perform easily almost any heavy duty task. However, the real power ratings of any blender depend much on overall motor design, the shape of blade and containers. The Ninja motor unfortunately not made very well with average life expectancy of about 1.5-2 years.  The blade to motor drive coupling and gear shaft of this machine are made of plastic, so no wonder it does not last.

The machine also equipped with automatic shut off and will stop operation ones it overloaded.

The gadget base unit is fairly lightweight but equipped with suction cups what makes it stable on the counter during operation. 


ninja-auto-iqThe Ninja Duo with Auto-iQ BL642/BL682/BL682Z comes with 72 oz. XL main container (all models), selection of 3 single serve cups with the capacity of 32 oz. 24 oz. and/or 18 oz. (BL482 have one of each while other models come with two 24 oz. cups and one 32 oz. cup). The BL482 and BL482Z models also include food processing bowl with the capacity of 64 oz.

All containers are made from quite a low-quality polycarbonate material. The main pitcher often develops the cracks at the bottom of the container near the drive shaft within 1 year of use. The same problem has the single serve cups which also have the tendency to crack due to overloads and often require replacement with 1 year of use. The single serve cups also may be very tough to screw/unscrew when connecting to the blade assembly, otherwise, it may leak during the blending process.


The Ninja Duo with Auto-iQ comes with two sets of blade system Total Crushing Blades and Pro Extractor Blade for BL462 model and two additional Chopping Blade and Dough Hook for BL482 and BL482Z models. All four blade systems are removable.

Total Crushing Blades for XL 72 oz. jar is designed as the plastic shaft with 6 very sharp stainless steel blades stacked around it. This construction is more suitable for the food processor bowl. So it is no wonder why this blade so inefficient in processing smoothies. In addition, this type blade system makes a bit difficult to fill the container with ingredients and reduce substantially the overall capacity of it. The edges of blades are also wear out quite quick and become useless even more, so need to be replaced fairly often.

Pro Extractor Blade for Single Serve cups has the standard for single serve blade assembly design. It comes with 6-prong stainless steel blade connected to the plastic base. The spline mechanism that connects the blade system to the motor drive is also made of plastic what do not add durability to the blade assembly. The single serve blade has the same problems as the main pitcher blade to become dull with 1 year of regular use.

Chopping Blade and Dough Blade have the very similar design to the XL main pitcher blade assembly system. The Chopping Blade only a bit shorter but also has the metal blades staggered around the plastic spindle. The dough hook is completely made of plastic. 

If you are not sure about this blender you can alternatively check here our article the Best Blender Under the $200 or Dash Chef Series Digital Blender vs Ninja Blender Duo with Auto-iQ BL642/BL682/BL682Z.

Special Features

Colors: The BL642 model come in black and silver color and the BL482 and BL482Z models include slightly more of silver trimming.

Tamper: This gadget packages do not include any tamper.

Certified Refurbished: None of this machine models are available in certified refurbished condition.

Use in countries outside of USA/Canada: The Ninja Blender Duo with Auto-iQ comes with 110-120 voltage system in US and Canada. However, it is available in many countries around the word and locally sold with the appropriate to the region voltage. Check here the price for the 220-240 voltage models via UK retailers. It also could be operated using the voltage transformer but not recommended for everyday use and advisable only for occasional use while abroad.


The Ninja Blender Duo with Auto-iQ is the very noisy machine that exceeds the level of noise other blenders with comparable power outputs. So it must produce noise of around 100 decibels.

Warranty and Customer Service

The Ninja Duo with Auto-iQ BL642/BL682/BL682Z machine comes with the 1-year limited warranty. The manufacturer charges an extra fee for shipping when the unit has to be sent for repair, many replacement parts are also subject to extra charges. The Ninja customer service earns the unpleasant reputation over the last years. So recently the Ninja initiated few special offers which sold the blender with lifetime limited warranty. However, it is hard to say how well this lifetime warranty will be undertaken.

Optional Accessories and Attachments

It is possible to buy from the manufacturer and other online retailers replacement blades, cups and lids for all models – BL642, BL682 and BL682Z. There is also coffee & spice grinder attachment and food processor bowl attachment kit available for this machine. Basically, any attachment made for Auto IQ line will be compatible with the Ninja Blender Duo with Auto-iQ.

Set Includes

Set Includes/Ninja ModelBL642
Base Unit 1500 Watts/2HPyes
XL 72 oz. (2.15 L) container with lid1
32 oz. cup1
24 oz. cup1
18 oz. cup1
64oz. Food Processor Bowl with Lid and Drizzle Hole0
Total Crushing Blades for XL 72 oz. jar1
Pro Extractor Blade for Single Serve cups1
Chopping Blade and Dough Hook0
Sip & Seal Lids3
Instruction Book1
Auto-iQ Program Guideyes
75 Recipe Cookbookyes
40 Recipe Inspiration Guideno
Rachel Beller Healthy Living & Recipe Book (Eat to Lose, Eat to Win)no

Check here the best today’s deal for the Nutri Ninja Blender with 1200-Watt Auto-iQ BL642


Ninja Blender Duo with Auto-iQ is very big and bulky machine which demands considerable space for storage. It comes with 7 inches x 10 inches (with for a plastic guard in back) footprint and the height of 17 inches with the XL jar on the top of the base unit. This machine must fit under the standard kitchen cabinet but occupies some space on the counter because of the massive footprint. 

Pros and Cons


  • The Ninja Blender Duo with Auto-iQ BL642/BL682/BL682Z is a powerful machine that includes few accessories what makes this blender quite versatile especially the models BL482 and BL482Z with food processing attachments.
  • The single serve attachment with a nice variety of cups allows to make drinks and take it out which is very convenient for many busy people.


  • The Ninja Blender Duo with Auto-iQ BL642/BL682/BL682Z machine with XL jar makes quite clumpy smoothies and shakes and not even able to pulverize berry seeds. Considering very powerful motor it indicates design faults in pitcher and blade construction.
  • It comes with a low-quality plastic container that tends to develop cracks within 1 year of use.
  • Although the single serve attachment blends good quality drinks, it has a problem with blades which become dull over time.
  • This gadget cannot handle hot liquids.
  • The construction of blades for the XL pitcher and lid makes this machine very difficult to assemble for use.
  • The motor to blade coupling for both XL pitcher and single serve attachment made with a lot of plastic what substantially reduce the durability of this machine.
  • The complicated system for opening the lid and lack of tamper equipment make this machine difficult to use and require often to stop it during operation for manual food mixing.
  • This machine is very big and bulky and requires considerable space for storing it.

Ninja Blender Duo Consumer Reviews

Despite the fact that this blender has quite a few construction flaws, the professional advertising keeps this gadget among the most desirable blenders on the market. No wonder it has very good reviews and ratings at the majority of online retailers sites.

Amazon rating – 4.6


The Ninja Blender Duo with Auto-iQ price fluctuates within the $160-$250 depending on the model. Many retailers, however, often offer the gadget at discount, so it is quite possible to buy this machine at very competitive price.

Check here the best today’s deal for the Nutri Ninja Blender with 1200-Watt Auto-iQ BL642


In general, the Nutri Ninja Blender with 1200-Watt Auto-iQ BL642 is very powerful machine with the powerful motor but overall poor construction and design. The XL pitcher and blade assembly more suitable for food processor than blender so it is not capable making even decent smoothies. The single serve attachment is quite good but has some drawbacks such as poor quality cups and the problem with tight screwing and leaking. It achieves versatility with the multiple attachments and not with an impeccable design like the typical high-end machines.

Alternatively, check here our articles the Best Blender Under the $200Dash Chef Series Digital Blender vs Ninja Blender 1200-Watt with Auto-iQ BL642 and and Cleanblend Blender vs Ninja Blender Duo with Auto-iQ.


18 comments for “Nutri Ninja Blender Duo 1200-Watt Auto-iQ (BL642) Review

  1. January 27, 2017 at 10:10 pm

    I would like a better cheese shredder for BL682. Does the cheese shredder/slicing disk included with BL773CO work with my BL682 which does a terrible job with cheese?

    • lucy
      January 30, 2017 at 12:51 am

      Hi Jackie,

      The BL773CO slicing disc is not compatible with BL682. Because the BL773CO food processing bowl and the BL682 bowl have slightly different designs.

      • Vicki
        July 13, 2017 at 7:16 pm

        So there is no cheese grating attachment that will work with my BL682Z?

        • lucy
          July 19, 2017 at 5:12 pm

          Hi Vicki,

          Unfortunately, Ninja does not produce any grating disc attachment for the Ninja BL682 model. The only Ninja model with the grating disc is BL773CO but the attachment is not compatible with BL682.

  2. Jackie
    January 30, 2017 at 10:41 pm

    Another question–Would the BL773CO food processing bowl fit on my BL682?
    Thank you

    • lucy
      February 1, 2017 at 1:58 pm

      Hi Jackie,

      Unfortunately, these models attachments are not interchangeable and Ninja BL773CO food processing bowl will not be compatible with BL682 model.

  3. jihy
    May 24, 2017 at 7:24 pm

    72oz xl main container for bl642 can use bl682?
    please answer my ask. As I live south Korea,I can’t refun and change easily.
    I have 72oz attachment for bl642, so I will buy its motor basement with ebay but it a little bit expensive than bl682
    So I wonder it exchangeable

    • lucy
      May 24, 2017 at 10:52 pm

      Hi jihy,
      Yes, the Ninja Blender Duo with Auto-iQ BL682 base unit is compatible with BL642 containers. The all four BL642, BL642Z, BL682 and BL682Z models for the Ninja Blender Duo with Auto-iQ have the identical base unit. The only difference between them is the selection of containers. So, you can buy the Ninja Blender Duo with Auto-iQ base unit and it must fit BL642 and BL682 containers. Basically, BL642, BL642Z, BL682 and BL682Z models have interchangeable containers.

  4. Diane Burns
    November 25, 2017 at 3:04 pm

    I purchased the BL770 & was curious to know if all Ninja bases are compatible…my daughter has the Auto IQ & I loved it…so, can you tell me if I purchase just the Auto IQ base would it work w/the BL770?

    • lucy
      December 1, 2017 at 2:38 pm

      Unfortunately, BL770 attachments are not compatible Ninja Auto IQ ones.

  5. Natalie
    January 9, 2018 at 1:28 am

    Will the parts that Ninja® Professional Prep System Model #: XSK642W2 work on BL640?

    • lucy
      January 11, 2018 at 1:52 pm

      Unfortunately, it will not work.

  6. Barbara
    January 9, 2018 at 11:08 pm

    I own a Ninja BL682 and it leaks when making smoothies. I have had this for a year plus, but have started using it more regularly. I have considered trying to replace the Pro extractor blade, but I wondered if I should purchase it from NINJA directly or from Amazon. There is a great difference in price. … Is there a difference in quality?

    Thank you

    • lucy
      January 11, 2018 at 1:50 pm

      Hi Barabara,

      The amazon has supply only from Ninja or approved distributors. You can buy any parts from amazon absolutely safely. The price differs from the different distributors for various reasons – the may have overstock, promotion periods and other and it does not mean the parts are from unapproved sources and thus they offered at more attractive prices.

  7. Hodaya
    April 17, 2018 at 3:39 pm

    Hi, in my country we have the BL480 and BL642. I bought the first, but then I consider change to the other.
    My question is: what are the differences between these two excapet that one is 1000W and the second is 1500W and that on the first the cup is 500/650ml and the second also has 2.1L. I mean, does the second give any extra abilities that the first can’t make? My main use is goinf to be for frozen shakes with frozen yogurt or fruits and perhaps making vegetables juice like caroot juice etc. I will appreciate a detailed answer examining the diferences.

    • lucy
      April 23, 2018 at 4:33 pm

      BL642 is the countertop blender with more parts and a wider range of functions, it takes more space, needs more efforts to clean. The BL642 model obviously has more power, in addition to single-serve functionality, it comes with the large pitcher that process not only larger volumes of food but a tower-type blade designed to perform some food processing tasks. However, both blenders do a great job of crushing ice or frozen ingredients and processing hard food like the carrot. If you need the blender only to make shakes and smoothies then you will be perfectly well with BL480 blender.

  8. Nili
    January 16, 2020 at 10:13 pm

    Hi, is 64 oz bowl for food processing compatible with bl642 model?

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