1000+ Verified Reviews

Sharpen Every Dull Knife in 60 Sec with Katusharp

Precision Sharpening Inspired by Japanese Craftsmanship

Two-stage diamond sharpening system
15° / 20° AngleLock™ base
Lasts for 6 months+
Beginner-friendly kit

8K+ Happy Customers

In stock and ready to ship

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LONG-LASTING SHARPNESS

SOLID OAK & ALLOY BODY

DUAL-GRIT DIAMOND DISC

NO EXPERIENCE NEEDED

Keep Your Knives Expertly Maintained

180° Reversible Diamond Disc

15° / 20° AngleLock™ Base

Industrial-Grade Diamond Abrasive

Built for Every Steel Hardness

Aluminum, Oak & N45 Magnets Build

One-Motion Rolling Action

Long-Lasting Sharpness

Magnetic Knife Holder

180° Reversible Diamond Disc

15° / 20° AngleLock™ Base

Industrial-Grade Diamond Abrasive

Built for Every Steel Hardness

Aluminum, Oak & N45 Magnets Build

One-Motion Rolling Action

Long-Lasting Sharpness

Magnetic Knife Holder

Roll, Restore, Refine & Get Back to Cooking

Sharpen Dull Knives With a Simple Rolling Motion

Two-Stage Precision System

Katusharp uses a dual-sided diamond disc engineered in two grits. The 400# side restores a dull or damaged edge, while the 1000# side refines it to a fine, working finish – one roller, two stages, a genuinely sharp result.

Long-Lasting Sharpness

Katusharp industrial diamond abrasive cuts fast and holds its edge – a few rolls now means weeks of true sharpness later. And with solid oak, aluminum alloy, and a replaceable diamond disc, Katusharp itself is built to last for years, not seasons.

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Zero Skills Required

Freehand sharpening takes years to master. Katusharp 15°/20° AngleLock™ base does the technique for you. Just roll the disc across the blade, and the angle stays locked in every time – everyone can do it.

Sharpen Your Knife in 3 Steps

Attach Your Knife to the Holder

Pick 15° or 20° on the AngleLock™ base and seat the blade flat against it.

Roll to Restore

Roll Katusharp heel to tip along the blade until the edge bites again.

Refine the Edges

Turn the DualGrit™ disc 180° to the 1000# side, roll once more & you’re good to go.

Fast Worldwide Shipping

Sharp Knives in 60 Secs

Fast Worldwide Shipping

Sharp Knives in 60 Secs

Fast Worldwide Shipping

Sharp Knives in 60 Secs

Fast Worldwide Shipping

Sharp Knives in 60 Secs

100% Satisfaction Guarantee With Katusharp

See the Difference from the First Cut

Diana M.

My chef’s knife was crushing tomatoes instead of cutting them. A few minutes with this and it’s slicing them paper thin again. WOW Katusharp!

Matthew R.

Same knife block for eleven years, never sharpened properly once. With this rolled, I did the whole set in an evening. I can’t believe the difference..Slices every product effortlessly, you can for sure tell this Katusharp is a solid handcrafted tool. 100% satisfied!

Jason G.

Katusharp is easier to use than it looks. You just hold the magnetic block and roll the sharpener against the knife. The result is incredible, and even my wife enjoys doing it! 🔪

How It Compares to the Sharpener in Your Drawer

Most sharpeners treat every knife with no regard for the blade’s geometry. Katusharp holds the angle a trained edge is built on, restoring & refining in two deliberate diamond stages.

Katusharp vs. Traditional Sharpeners

Others

No skils needed

Restores and refines in one tool

Industrial diamond abrasive

Works dry

Handles knife steel of any hardness

Replaceable sharpening disc

Oak and aluminum alloy build

Thousands of Happy Katusharp Users

Check out these reviews from happy Katusharp users around the world!

4.7

1,894 reviews

736

1,134

95% of reviewers would recommend this product to a friend

Results

Quality

Satisfaction

Dave R.

Verified customer

2 days ago

I recommend this product

2 days ago

All knives are finally sharp again 🙂

Had a set of German knives from our wedding sitting in the block getting worse every year. 4 minutes each and they’re slicing tomatoes clean again. No idea what I was waiting for.

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Marilyn K.

Verified customer

2 days ago

I recommend this product

2 days ago

No skill required at all, so easy!!

Ive owned two whetstones and never once got a knife properly sharp with either 😣 This you just roll. The angle is already set for you. My husband thinks I paid someone to do them.

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Greg P.

Verified customer

3 days ago

I recommend this product

3 days ago

Faster than I expected 👏

Dozen passes on the coarse side…flipped the disc, dozen more. Whole thing took less time than heating the pan. Good tool! 👏

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Tony D.

Verified customer

4 days ago

I recommend this product

4 days ago

Great for us grill guys

I do a lot of brisket and the trimming knife goes dull fast. Now I hit it before every cook, takes 2 minms, and Im not sawing through fat cap anymore.

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Nill S.

Verified customer

4 days ago

I recommend this product

4 days ago

Heavier than it looks and that's good

Nice bit of oak and metal. Sits solid, doesn’t skate around the counter while you’re rolling.

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Rachel B.

Verified customer

4 days ago

I recommend this product

4 days ago

bought it as a gift and kept it

Ordered 1 for my dad for fathers day then ended up uying a 2nd for myself two weeks later..

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Kenji Y.

Verified customer

5 days ago

I recommend this product

5 days ago

Works on the Japanese steel too

My santoku is hard steel and most gadgets just skate off it. The coarse side bit right in. The fine side left a genuinely clean edge after…!

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Paula P.

Verified customer

6 days ago

I recommend this product

6 days ago

Easy to use

I do it standing at the counter and put it straight back. Very satisfied.

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More Happy Customers

See what our customers are saying!

Didnt need to replace my knife collection 👍

I genuinely had a cart open with a new knife set in it. Tried this first. Cancelled the order. Same knives, cutting the way they did the day I got them.

Gina H.

Verified customer

My wife uses it

Bought it thinking it would be my thing. She’s the one sharpening now because it takes no strength at all. It just rolls. Really really good quality KatuSHARP!

Lin P.

Verified customer

Simple

You set the angle. You roll. Its sharp. I don’t know what else to tell you.

Donji D.

Verified customer

got it right on the first try

was worried id ruin my good knife but theres nothing to ruin really, the angle is built into the base so you cant hold it wrong. did all 6 in the block the first night 😂

Paul O.

Verified customer

Coarse side does heavy work

400 side is what impressed me. I had a paring knife that was basically a butter knife at this point. It came back 😀 The 1000 side after just tidies it up.

Jed S.

Verified customer

Works great, just be sure which angle you pick.

I did a thin blade at 20 the first time before I realized. Still sharp, just not what I wanted. My fault, not the product’s.

Donna P.

Verified customer

Dont skip the fine side!

Nearly stopped after the coarse side because it already felt sharp. Did the 1000 anyway. Completely different edge, much smoother through an onion. Do both!

Denis R.

Verified customer

Solid product, takes time to get used to

Bit I liked: the sharpening disc is replaceable. So when it eventually wears down Im not throwing the whole thing out. Not many products think that far ahead.

Jimmy Q.

Verified customer

Rated 4.7 – Showing our 4 & 5 star reviews.

“Katusharp was rated as the best knife sharpener of 2026.”

Meet Our Expert,

Japanese-Trained Chef & Bladesmith

Years behind a whetstone will teach you one thing above all: an edge is only as good as the angle behind it. That’s the principle I carried from the kitchen into Katusharp’s design – control the angle, take only the steel the blade actually needs, and never rush. I didn’t want to build another sharpener that asks you to master a technique. I wanted the technique built into the tool itself, so the result holds up whether it’s your first roll or your thousandth.

Nobu Toshiro

Frequently Asked Questions

How does Katusharp sharpen without water?

Katusharp uses an industrial diamond abrasive disc, which cuts through steel on its own, unlike whetstones, which need water to lubricate the stone and clear away metal particles. Just roll it dry, straight out of the box.

What's included in the rolling knife sharpening kit?

1x Katusharp Rolling Knife Sharpener (oak, aluminum alloy & N45 magnet base). 1x Dual-sided diamond disc (400# / 1000#), pre-installed and ready to use. 1x Instruction manual, with step-by-step setup and sharpening guidance.

Will Katusharp work on my knives?

Yes. The diamond disc is built to sharpen steel of any hardness – from softer Western-style chef’s knives to harder Japanese steel – so you don’t need different tools for different blades.

What's the difference between the two sides of the disc?

Each disc has two grits. The 400# side restores a dull, damaged, or neglected edge. Flip the disc over, and the 1000# side refines that edge to a fine, working-sharp finish.

How long does the diamond disc last, and can I replace it?

The disc is built for extended repeated use, and it’s fully replaceable, so when it’s time, you swap the disc rather than the whole sharpener.

How do I attach my knife to the sharpener?

The base uses magnets to hold the blade securely at the correct angle while you roll. Full step-by-step setup is in the included manual.

Do I need any sharpening experience to use it?

None. The AngleLock™ base holds the position that a whetstone expects you to hold by hand, so the one skill sharpening normally requires is the one part you don’t do. Seat the blade, roll, flip, roll. It’s built for someone who has never sharpened a knife in their life.

Should I use the 15° or the 20° angle?

20° builds a sturdier edge that stands up to everyday kitchen work – it’s the safe default for most knife blocks. 15° gives a finer, more acute edge and suits thinner blades. Choose whichever fits the knife, then stay with that angle for that knife from then on.

Do I need any oil or setup?

No. The diamond system runs completely dry. Nothing to soak beforehand, nothing to rinse afterwards, no wet stone taking up the sink.

My knife still isn't sharp – what am I doing wrong?

You may be on the 1000# refine side when the edge still needs the 400# restore side; the blade may not be seated flat against the AngleLock™ base; or the edge simply needs more passes. Start coarse, check the blade is sitting flush, and give it more rolls before you flip the disc.

Fast Worldwide Shipping on All Orders!

We offer fast worldwide shipping on all Katusharp orders. Enjoy reliable service on every order – delivered fast to your door.

CUSTOMERS’ TRUSTED ROLLING KNIFE SHARPENER

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4.7

In stock and ready to ship

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LONG-LASTING SHARPNESS

SOLID OAK + ALLOY BODY

DUAL-GRIT DIAMOND DISC

NO EXPERIENCE NEEDED