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  • Frank Striegl

Ramen, Soba, Udon - What's the Difference?

Ramen, Soba, and Udon. This delightful trio of Japanese noodle dishes is popular the world over. But what exactly are the differences between the three? We break it down for you!

Soba - The Eldest Child

Soba is the OG. It may have been brought from China as early as 500 BC (Japan's Jomon period). We have more reliable records of soba appearing after this - after 700 AD or so.

Ramen, Soba, Udon - Outside Soba Shop
Soba Restaurant in Tokyo

But soba as we know it today (buckwheat noodle form) wasn't widely consumed in Japan until the 1600s.

Soba Noodles

So what are soba noodles made of? They're mostly water and buckwheat flour. Since this includes buckwheat skin, the noodles are brownish gray in color. But most soba noodles have wheat flour in them too.

In fact, only "junwari soba noodles" are 100% buckwheat. Make sure to ask for these if you have a wheat allergy. Besides buckwheat and wheat flour, soba restaurants may blend eggs, yams, red algae, or other ingredients into their noodles.

Soba Broth

Soba noodles have a particularly earthy flavor to them. Complementing this, soba broth is relatively simple, light, and refreshing. Soba broth is normally soy sauce and Japanese dashi - edible kelp (kombu) and bontio fish flakes (katsuobushi).

Cold Dipping Soba (Zaru Soba)

Soba can be served hot or cold. When cold, the noodles are usually served separate from the broth (dipping form).

Soba Toppings

There's a wide range soba toppings. The list includes spring onions (negi), seaweed, nameko mushrooms, duck meat, tempura...and so on and so forth.

Ramen, Soba, Udon - Duck Soba
Duck Soba (Kamo Soba)

There are many regional varieties of soba with their own toppings as well. For example, "Kitsune Soba" features deep-fried tofu.

Note: Lower in calories, Soba Noodles are healthier than Udon or Ramen Noodles!

Udon - The Middle Child

Udon can also be traced back to China, likely coming to Japan after soba did. Noodle records more clearly indicate that udon was in Japan after the 700s.

Meat Udon (Niku Udon)

Udon Noodles

Bright and white in luster and color, udon noodles are made from wheat flour...not buckwheat flour. Furthermore, udon noodles are generally quite thick and slippery - more so than soba. Since salt is added during prep, they also have more bounce to them.

That distinct earthy flavor in soba noodles is not to be found in udon noodles. Think of udon noodles as more neutral. This has opened the door for more punchy broths (below).


A lot of the time, traditional udon broth is similar to soba broth. That is, soy sauce and Japanese soup stock (dashi) form the base, along with ingredients like mirin and sugar.

Ramen, Soba, Udon - Curry Udon
Curry Udon in Tokyo

However, you do get more punchy, modern udon broths these days. This works because neutrally-flavored udon noodles don't clash with a heavier broth. In soba, a heavier broth would be too much next to the flavorful buckwheat noodles.

Curry udon is the most popular offshoot of traditional udon. It features a thick, Japanese curry style broth. Udon can also be served hot or cold.