Put our two usuba next to each other in a product grid and most people will not see much difference. Same rectangular vegetable blade, same single bevel, same polished migaki finish, same pale magnolia wood handle with a black collar. One is a stainless knife you can learn katsuramuki on and stop worrying about. The other is a VG-10 knife hand made in Sakai that will outlast your career. A photo does not tell you which is which.
That problem is why every knife on Smart Sushi Chef has a knife card. The card puts the details that decide how a Japanese knife performs (steel, hardness, edge, finish, handle, weight, where it was made) in the same place on every knife, and the colour of the card gives you our tier for it before you read a single line.
The SSC knife tier system allows the most important details to be noticed at a glance. For a more modern, enjoyable, and fast shopping experience.
That is what the tiers are for.
This post explains what is on a card, what the seven tiers mean, what moves a knife up the ladder, and the parts of the site built around the cards: side-by-side comparison, pairings on product pages, and the Knife Deck in your customer account.
What a Knife Card Shows You
Every card is laid out the same way, so once you have read one you can read all of them.
The header carries the knife's name, its type (gyuto, petty, usuba, yanagiba and so on), and a line that sums up steel, finish and weight.
The art is a portrait of the knife in its tier colour, made from our own product photos of that exact knife.
The tier and its crest. Each tier has its own colour and its own kamon, the family crest motif you see on the card. More on the tiers below.
The spec rows are the part that does the work:
- Steel. What the blade is made of. This is the biggest single factor in how sharp a knife can get and how long it stays that way. INOX and molybdenum vanadium stainless are easy to live with; VG-10 is a harder stainless core used across a lot of Sakai knives; Shirogami (white steel) and Aogami (blue steel) are carbon steels that take a keener edge but will rust if you leave them wet.
- Hardness. The Rockwell (HRC) rating. Around 56-58 is soft enough to resharpen easily and forgives a knock on the board. 60-63 holds an edge much longer but is more brittle, so it wants a cleaner technique.
- Edge. Double bevel (sharpened on both sides, like a Western knife) or single bevel (one side ground, the back flat with a slight hollow). Single bevel knives like the usuba and yanagiba are the traditional Japanese tools for vegetables and fish, and they need a different sharpening routine. We wrote about that in Sharpening Single Bevel Knives.
- Finish. Migaki (polished), kurouchi (the black forge scale left on above the bevel), tsuchime (hammered dimples that help food release) or damascus (layered steel showing as a pattern).
- Handle and grip. The material and the shape: octagonal or D-shaped wa handles, oval, or a Western riveted handle.
- Length, weight and origin.
None of this is hidden on a normal product page, but on most shops it is spread across a description written differently for every knife. On the card it is in the same row every time, which is what makes two knives comparable at a glance.
The Seven Tiers, From Common to Mythic
There are seven tiers. Each has a fixed colour on the site:
- Common (grey)
- Uncommon (light blue)
- Rare (deep blue)
- Epic (jade green)
- Legendary (red)
- Unique (purple)
- Mythic (crimson and gold)
A tier is our call on how much knife you are getting. It comes from the same things a knife buyer in Sakai would look at: the steel, the edge, the maker and the forge town, the finish and handle, and how many of that knife exist.
The things that push a knife up the ladder:
- Steel. Aogami blue steel and the top powder steels (SG2, ZDP-189, HAP40) count the most. VG-10, Ginsan and Shirogami count for less. Basic stainless counts for nothing on its own, which is fine: plenty of good working knives are basic stainless.
- A single bevel edge. It takes more skill to grind and more skill to use.
- Where it was forged. Sakai, Tosa, Echizen and Seki are the knife towns, with generations of smiths behind them.
- An octagonal wa handle, the traditional professional choice.
- Hand forging or honyaki, where the blade is forged and differentially hardened from a single piece of high carbon steel.
Mythic is different. It is reserved for one-of-one pieces: a single knife, not a production line, with its own card that lists the forge, the bolster, the handle and the number of the piece. When it sells, that card is gone.
A practical example from the shelf. The two kiridashi we stock are the same 18 mm marking and carving knife. The Mikihisa version is Shirogami white steel with a nashiji finish, and it sits at Uncommon. The other is Aogami blue steel, harder at 61-63 HRC, with a kurouchi finish, and the blue steel alone carries it up to Epic. Same shape, same job, two tiers apart, and the card tells you why.
Same Knife Type, Two Different Stories
Most Japanese knives come in a handful of standard shapes. What changes from one gyuto to the next is the steel, the hardness, the finish, the handle and the length. It works a bit like building a loadout in a video game: the base shape stays the same and every part you swap changes what the finished knife is.
Back to the two usuba from the top of this post, because they show it well.
The Toshu Usuba 180mm is molybdenum vanadium stainless at 56-58 HRC, 197 g, with a magnolia wood handle. It is the knife I would hand to someone learning katsuramuki: it resharpens quickly, it will not rust if you forget it on the board for ten minutes, and a small chip is a five minute fix on a 1000 grit stone. It is Rare.
The Sakai Kikumori Usuba 210mm is longer and heavier at 280 g, with VG-10 at 60-61 HRC and an octagonal magnolia handle. It is a solid VG-10 masterpiece hand made in Sakai, and we only get them one at a time. It is Unique.
Neither is the wrong choice. A line cook doing two hundred cucumber sheets a night might be better off with the Toshu, because it is quicker to maintain. Someone who wants one usuba for the next twenty years will feel the difference in the Kikumori. The tiers are there so that difference is visible before you click into either product, not after.
Compare, Pair and Collect
The cards are the base for a few other things on the site.
Compare two knives side by side. On the knives collection, tick any two cards and open the compare view. The two cards line up next to each other, row against row, so steel sits next to steel and hardness next to hardness. You can also filter the collection by knife type and by steel family first, so you are only comparing knives that do the job you need.
Pairings on the product page. Scroll down a knife's product page and you will find the cards for what goes with it: the saya (wooden sheath) cut for that blade where we stock one, and camellia oil for keeping carbon and stainless steel from rusting.
The Knife Deck. If you have a customer account, every knife you buy from us adds its card to your Knife Deck. The deck lives in your account next to your orders, it keeps the cards you have collected in one place, and you can share it with a link if you want to show someone your rack. Accounts are free.
Achievements. Accounts also come with achievements, some for orders, some for the games on the site, and a few tied to building your deck. Some of them are hidden until you find them.
Why We Built It This Way
A lot of knives sold online look like Japanese knives and are not, or are Japanese in name and made somewhere else from soft steel with a hammered finish pressed on to make them look hand forged. From a photo, a 30 euro knife and a 300 euro knife can be hard to tell apart, and the person who finds out the difference is the one using it six months later.
The tiers are how we pass on what we know about Japanese knives without asking you to learn it all first. When we put a knife at Legendary, it is because of the steel, the edge, the maker and how many exist, and the card lists every one of those so you can check our reasoning. Over time that is the point: if the high tier knives keep earning their place in your kitchen, you can trust the colour on the next card you see.
It is also meant to be fun. Knives are something people collect whether they admit it or not, and a deck that fills up as your kit grows is a better record of it than an order history.
If you want to start reading cards, the knives collection has every one of them. Where will you start your collection?
FAQ: SSC Knife Cards and Tiers
What is a knife card on Smart Sushi Chef? Every knife we sell has a card showing its tier, a portrait of the knife, and the same set of spec rows: steel, hardness, edge, finish, handle, grip, length, weight and origin. Because the layout never changes, you can read any two knives against each other in seconds.
What are the SSC knife tiers? There are seven: Common (grey), Uncommon (light blue), Rare (deep blue), Epic (jade green), Legendary (red), Unique (purple) and Mythic (crimson and gold). The tier is our assessment of the knife based on its steel, edge type, maker and forge town, finish, handle and how many exist.
What makes a knife Mythic? Mythic is reserved for one-of-one pieces. A Mythic card lists the forge, the bolster, the handle and the number of the piece, and once that knife is sold the card is gone.
Does a higher tier mean a better knife for me? Not always. A higher tier means harder steel, more demanding geometry, a more renowned maker or a rarer piece. A softer stainless knife in a lower tier is often the better choice for a beginner or a busy line, because it is easier to sharpen and harder to damage.
How do I compare two Japanese knives on the site? On the knives collection page, select any two cards and open the compare view. The cards sit side by side with matching rows, so differences in steel, hardness, edge and weight are easy to spot.
What is the Knife Deck? The Knife Deck is part of the free SSC customer account. Every knife you buy adds its card to your deck, and you can share the deck with a link.