The nutribullet Flex is a cordless portable blender for making single-serve smoothies on the go. It comes with a 22-ounce jar, a USB-C rechargeable battery, and a sip lid with a carrying loop for easy transport. The blender features LED indicators that show battery level and blending status, along with simple one-button operation for 30-second blending cycles.
This blender is available in a variety of colors. See the Differences Between Sizes and Variants section for more details.
Our Verdict
The nutribullet Flex isn't a good multi-purpose blender. As a portable blender, it's designed for making single-serve smoothies on the go, yet even that task yields mediocre results. For everything else, it struggles. It can't handle hot ingredients, so soup is off the table. Ice crushing is inconsistent and chunky. Thicker blends like nut butter take a long time, yield poor, lumpy results, and tend to overheat the motor. The 15-ounce blending capacity and short battery life mean you're constantly working around its limitations.
Easy to clean.
Can't hot blend.
Makes inconsistent crushed ice.
Small, 15-ounce blending capacity.
Doesn't smoothly blend fibrous ingredients.
The nutribullet Flex makes acceptable single-serve smoothies. You'll get a drinkable smoothie, but it takes more work than it should. The texture comes out grainy with visible chunks of leafy greens even after six blending cycles. The bigger issue is how much babysitting it needs. You'll have to stop and scrape down the sides multiple times. If you're trying to make a quick smoothie at work or the gym, this blender makes it a hassle, which is unfortunate since personal blenders should excel at this task.
Easy to clean.
Compact, lightweight design.
Makes inconsistent crushed ice.
Doesn't smoothly blend fibrous ingredients.
The nutribullet Flex is a poor choice for making multiple servings of smoothies. To be fair, portable blenders aren't really designed for batch blending, but if you're hoping to make smoothies for two people, it's not a good choice. The battery only lasts about 4.5 blending cycles before it dies, which isn't enough time to process a full batch properly. The end result is chunky and grainy, with visible bits of leafy greens throughout. You'll also spend a lot of time stopping to scrape down the sides.
Easy to clean.
Makes inconsistent crushed ice.
Small, 15-ounce blending capacity.
Doesn't smoothly blend fibrous ingredients.
The nutribullet Flex portable blender isn't suitable for crushing ice. The results are inconsistent; you'll get some snow-like crushed ice mixed with barely processed cubes. The process also takes a lot of effort. You'll need to stop repeatedly to shake the jar and reposition ice cubes so they're actually near the blades. Even after all that work, the texture still isn't good enough for most frozen drinks.
Makes inconsistent crushed ice.
Small, 15-ounce blending capacity.
The nutribullet Flex isn't suitable for making soups. It can't heat ingredients or blend hot ingredients, so it's only capable of making cold soups or pureeing ingredients that you'll heat up later. Even if you're just trying to puree cold soup ingredients, the battery dies too quickly to handle tougher vegetables, and the motor overheats easily. The grainy texture you get from fibrous ingredients means your soup won't be smooth. The small 15-ounce blending capacity also limits how much you can make. If you want to make soups, consider a full-sized or immersion blender.
Easy to clean.
Can't hot blend.
Small, 15-ounce blending capacity.
Doesn't smoothly blend fibrous ingredients.
The nutribullet Flex is a portable blender for personal use, not commercial settings. The 15-ounce blending capacity is way too small for blending drinks in large volumes. You'd need to make each order individually. The battery limitations make this even worse for professional environments. It can't operate for very long, and the motor overheats if you push it too hard. If you're looking for a blender for any kind of business or high-volume use, you need a high-end full-size blender with more power and capacity.
Easy to clean.
Can't hot blend.
Makes inconsistent crushed ice.
Small, 15-ounce blending capacity.
Doesn't smoothly blend fibrous ingredients.
Changelog
- Updated Feb 20, 2026: We converted this review to Test Bench 1.0.1. We've added a result for Portable in the Dimensions section to indicate whether the blender has a built-in battery for cordless use.
- Updated Jan 05, 2026: Review published.
- Updated Dec 16, 2025: Early access published.
- Updated Oct 16, 2025: Our testers have started testing this product.
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Differences Between Sizes And Variants
The nutribullet Flex comes in six colors: 'Gunmetal Gray,' 'Sapphire Blue,' 'Forest Green,' 'Ruby Red,' 'Orchid Purple,' and 'Violet Purple.' We bought and tested the 'Orchid Purple' version. Here's a picture of our unit's label.
If you encounter another variant, let us know in the comments, and we'll update our review.
Popular Blender Comparisons
There are lots of portable blenders on the market, and the nutribullet Flex doesn't manage to stand out. Models like the Ninja Blast and the nutribullet Flip produce smoother results with less effort and handle fibrous ingredients better. The Flex requires constant stopping and scraping, and the battery dies before you can get good results. The one area where the Flex excels is cleaning. The removable blade assembly makes it significantly easier to clean than portable blenders with fixed blades. It's also quieter than most other models, making it ideal if you don't want to disturb others at the gym or office. However, when it comes to actually making high-quality smoothies, you can find many better mid-range and even budget models available.
For more recommendations, check out the best portable blenders, the best bullet blenders, and the best personal blenders.
The Ninja Blast Max BC251 is significantly better than the nutribullet Flex overall, but the Flex does have some advantages. Get the Ninja if you often make single-serve smoothies or crush ice for drinks; it excels in these categories and will produce much smoother drinks and finer ice. Consider the nutribullet if ease of use is your primary concern. It's much quieter and features removable blades that make it easier to clean, which is a rare addition for personal blenders.
The nutribullet Flip is significantly better than the nutribullet Flex when it comes to making single-serve smoothies. It produces silky smooth blends of fruit and kale, whereas the Flex leaves visible bits of greens behind. However, the Flex is quieter and has the edge when it comes to ease of cleaning, due to its removable blades.
The Ninja Blast performs significantly better than the nutribullet Flex for most purposes. Both blenders are designed for making single-serve smoothies on the go, and the Blast produces a smoother blend with less effort. It's also more lightweight and has a better build quality. However, the Flex has a bigger jar that detaches from the base, allowing you to blend larger smoothies to take on the go.
The nutribullet Flex and the nutribullet Portable offer similar overall performance, with each model having its own strengths. The Portable is slightly lighter and has a superior build quality. It fares much better when blending large quantities of ingredients and produces higher-quality crushed ice. The Flex, on the other hand, has a larger capacity and is much easier to clean because of its removable blades. It's also significantly quieter.
Test Results
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