Ninja Blast vs Nutribullet Portable for Fasting 2026

You break your fast at noon. You are at your desk, in the car, or at the gym, and you have maybe eight hours to hit your protein target before the window closes. This is exactly the situation portable blenders were made for — and in 2026 they finally got good enough to matter. RTINGS bought and tested more than 35 portable blenders this year alone, and two models kept rising to the top: the Ninja Blast and the nutribullet Portable. Both are cordless, both charge by USB-C, both land in the same $40 to $50 price range, and both are designed to blend a single shake and get out of your way.

So which one belongs in your fasting toolkit? We dug into the lab data, the specs, and the day-to-day realities of using these blenders inside an intermittent fasting routine to find out. If you are still deciding between a full-size machine, our best blenders for keto and fasting meal prep roundup covers the countertop options — but for eating-window speed, portable wins.

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Quick Comparison Table

The Ninja Blast: Built for Fast, Quiet Shakes

The Ninja Blast is the brand’s answer to the cordless personal blender, and it shows the kind of engineering attention Ninja usually reserves for its full-size systems. The headline number is the blade assembly: six sharp blades spinning at 17,900 RPM inside an 18-ounce BPA-free cup. That extra blade count is not marketing fluff — in RTINGS lab tests, it translated into measurably better performance with the exact ingredients fasters put in their shakes. Think spinach, kale, frozen cauliflower, almond butter, and thick unflavored protein powder.

At 10.6 inches tall and 1.8 pounds, the Blast is the more compact of the two. It fits standard cup holders, slides into a laptop bag side pocket, and does not dominate a hotel nightstand. The lid screws on with a leak-proof seal, and Ninja includes blade and cup covers in the box — a small touch that matters when the blender lives in your gym bag full-time. It charges over USB-C, so the same cable that tops up your phone can feed your blender.

The practical win for fasting is noise. The Ninja Blast runs at 81.5 dB at maximum speed, roughly the volume of a loud dishwasher. That is a full 6 dB quieter than the nutribullet Portable, and it is the difference between blending a post-fast shake at your desk without apologizing to everyone in the room and wincing through it. If your eating window overlaps with work hours, this matters more than you would expect.

Check the latest Ninja Blast price on Amazon and read what other fasters say about it.

The nutribullet Portable: More Capacity, Same Cordless Freedom

nutribullet has been the household name in personal blenders for over a decade, and the Portable is its first serious entry into the truly cordless category. The headline spec is capacity: a 20-ounce cup, two full ounces more than the Ninja Blast. For an OMAD-style eater or anyone who blends a massive keto shake with avocado, protein powder, MCT oil, and a handful of greens all at once, those two ounces are the difference between “full” and “spilling over the lid while you screw it on.”

The trade-offs show up elsewhere. The nutribullet Portable carries four blades instead of six, spins marginally slower at 17,700 RPM, and stands an inch taller at 11.9 inches. In RTINGS testing, that lower blade count showed up exactly where you would guess: fibrous ingredients. Processing scores for small batches landed at 3.5 out of 10 versus the Ninja’s 6.0, meaning the nutribullet needed shaking and scraping to fully break down greens and fibrous vegetables. It can do the job, but it asks for your help.

The Portable is also louder — 87.6 dB at max speed — and its taller profile is less cup-holder friendly. What it does offer is the familiar nutribullet experience: same screw-on cup philosophy, same simple one-button operation, same BPA-free dishwasher-safe cup, and USB-C charging. For loyal nutribullet owners who want their first cordless model, it is a comfortable step.

See the nutribullet Portable on Amazon and compare current colors and bundles.

Head-to-Head: What Lab Testing Found

Both blenders were tested side by side by RTINGS using their current blender methodology, and the results paint a clear picture: these are close cousins, but the Ninja Blast is the sharper tool for shake-making.

Fibrous ingredients. This is where the comparison is decided. On small-batch fibrous blends — spinach, kale, celery, frozen berries with stems — the Ninja Blast scored 6.8 out of 10 versus 5.9 for the nutribullet. The gap widens on processing alone: 6.0 versus 3.5. Translation: the Ninja liquefies greens; the nutribullet leaves you shaking the cup mid-blend. For keto green shakes specifically, this is the single most important number on the page.

Smoothies. Single-serving smoothies went to the Ninja, 7.0 versus 6.3. Multiple-serving scores were nearly identical (5.5 versus 5.3), which is expected — neither is built for family-sized batches.

Nut butter. Fat-bomb shakes with almond or peanut butter scored 5.9 on the Ninja versus 4.7 on the nutribullet, with texture scores of 8.5 versus 6.5. Thick, high-fat keto shakes are exactly what many fasters drink to close their window, so this matters.

Ice crushing. A dead tie at 4.7 for both. Neither portable blender is an ice crusher — if frozen margaritas are your thing, buy a countertop machine. For shakes, blend with chilled liquids and soft-frozen fruit instead.

Cleaning. Ninja 7.0, nutribullet 6.0. The Ninja’s blade design is easier to rinse clean by hand, which matters when you are washing your blender in a office kitchen sink between meetings.

Build quality. Another tie at 8.0. Both feel solid for the price; neither will survive being run over by a car, but both handle gym-bag life.

RTINGS summed it up plainly: the Ninja Blast is “a bit better” because you do not have to shake or scrape its jar to get good results, it cleans more easily, and it runs quieter. The nutribullet Portable’s counterargument is its larger cup — and for some fasters, that is enough.

Which Blender Wins for Fasting?

The right answer depends on how your eating window actually works. Here is the breakdown by use case.

Best for Keto Green Smoothies: Ninja Blast

If your break-fast shake is built on spinach, kale, avocado, and collagen, the Ninja’s fibrous-processing advantage (6.0 versus 3.5) is decisive. You will get a smooth drink in one blend cycle instead of stopping to shake the cup twice.

Best for the Office: Ninja Blast

At 81.5 dB versus 87.6 dB, the Ninja is meaningfully quieter, and its shorter 10.6-inch frame takes up less desk space. Blend at 12:30 PM without becoming a meme in your team chat.

Best for OMAD and Big Shakes: nutribullet Portable

If your eating window is really one large meal and one massive shake, the 20-ounce cup wins. Load it with protein powder, MCT oil, nut butter, and ice without playing Tetris with the lid.

Best for Travel and the Gym: Tie

Both weigh under two pounds, both charge by USB-C, and both fit a gym bag. The Ninja’s included blade and cup covers give it a hair of an edge for true portability, but this category is effectively a draw.

How They Fit Your Fasting Schedule

Here is the practical setup most fasters end up with. The night before, measure your dry ingredients into the blender cup — protein powder, a scoop of a scoop of unflavored collagen peptides, a teaspoon of a teaspoon of MCT oil powder, and your greens. Keep it in the fridge or your bag. When your window opens, add cold water or unsweetened almond milk, blend for 30 to 45 seconds, and drink.

Yes, a protein shake technically ends your fast — but that is the point. Shakes belong at the start of your eating window, where they blunt hunger and help you hit protein targets before dinner. We covered the full science in can you drink protein shakes while fasting? — short version: calories break the fast, and that is fine when it is deliberate.

The blender itself should be the easy part of your routine. Whichever model you choose, keep a bag of fasting-friendly protein powder at your desk, and pair your shake habit with the prep system from our intermittent fasting meal prep guide. The goal is zero friction between “window open” and “protein in.”

Frequently Asked Questions

Do these portable blenders crush ice well?

Not really. Both the Ninja Blast and nutribullet Portable scored 4.7 out of 10 for ice crushing in lab tests. They will handle a few small cubes in a shake, but for reliably crushed ice, use a countertop blender or blend with chilled liquids and soft-frozen fruit instead.

Will a protein shake break my fast?

Yes. Any meaningful calories end a fast. That is not a reason to avoid shakes — it is a reason to schedule them. Drink your shake at the start of your eating window so it supports muscle recovery and satiety instead of fighting your fasting goals.

Is the Ninja Blast quiet enough to use at work?

At 81.5 dB, it runs about as loud as a dishwasher — audible, not deafening. It is the quieter of the two portable options, and most people find it perfectly acceptable in an office kitchen or home office.

Can I blend frozen avocado or cauliflower for keto shakes?

Yes, both handle soft frozen ingredients, but the Ninja Blast’s six-blade assembly processes fibrous and frozen ingredients with less shaking and scraping. If your shakes lean heavily on frozen vegetables, the Ninja is the better tool.

Which blender is easier to clean at the office?

The Ninja Blast, per lab cleaning scores of 7.0 versus 6.0. Add a drop of dish soap, blend warm water for 15 seconds, rinse, and you are done — no brush required in most cases.

The Verdict: Our Pick for Fasting

For most intermittent fasters, the Ninja Blast is the one to buy. It blends greens smoother, cleans easier, runs quieter, and does not require the mid-blend shake that the nutribullet Portable demands. It is the better eating-window tool for keto shakes, office use, and daily protein routines.

The nutribullet Portable wins only if capacity is your bottleneck — OMAD eaters and anyone blending 20-ounce monsters will prefer its larger cup, and the performance gap is smaller for simple protein-and-liquid shakes than it is for fibrous green blends.

Either way, you are spending under $50 to remove the single biggest excuse for missing your protein target during a fast: not having a shake ready when the window opens. Pair either blender with our full-size blender roundup for meal-prep days, and your fasting kitchen is covered.

Ready to pick one up? Check the Ninja Blast on Amazon or see the nutribullet Portable on Amazon before your next eating window starts.

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