Walk into any Japanese supermarket and the soy sauce aisle is overwhelming — a dozen varieties, each subtly different in color, thickness, saltiness, and intended use. Japanese soy sauce (shoyu, 醤油) is not a single condiment but a family of fermented products shaped by regional tastes, local soybeans, and centuries of brewing tradition. Understanding the five main types transforms how you cook Japanese food and changes what you notice on every restaurant menu. Here is the complete guide.
The 5 Main Types of Japanese Shoyu
Koikuchi (濃口)
NationwideColor: Dark brown · Salt: ~16%
Best for: All-purpose: teriyaki, ramen tare, dipping sauces, stir-fries
Accounts for ~80% of all shoyu production in Japan
Usukuchi (薄口)
Kansai (Kyoto, Osaka)Color: Golden amber · Salt: ~18–19%
Best for: Clear broths, simmered vegetables, egg dishes, tofu
Lighter color but saltier — adds flavor without darkening the dish
Tamari (たまり)
Nagoya & TokaiColor: Very dark, thick · Salt: ~16%
Best for: Sashimi dipping, yakitori glaze, teriyaki, noodle dipping
Little or no wheat — richer, more viscous than koikuchi
Saishikomi (再仕込み)
Yamaguchi PrefectureColor: Deep mahogany · Salt: ~12–14%
Best for: Finishing sauce for tofu, raw fish, carpaccio
Double-brewed in existing soy sauce instead of brine — intensely complex umami
Shiro (白)
Aichi / KagawaColor: Pale amber · Salt: ~14–18%
Best for: Chawanmushi, white fish marinades, clear soups
Highest sugar content of all shoyu types — very light flavor and color
Stay in Kyoto — Kansai Shoyu Country
Kyoto is the home of usukuchi shoyu and refined kaiseki cuisine built around light-colored broths and perfectly seasoned vegetables. Nishiki Market — Kyoto's covered food market — is lined with vendors selling premium shoyu, yuzu ponzu, and dashi-based condiments to take home. Pair a morning at Nishiki with an afternoon in Fushimi Inari and dinner at a traditional kaiseki restaurant to experience Kansai food culture at its peak.
Top Japanese Soy Sauce Brands
🏭 Kikkoman
Noda, Chiba
Standard koikuchi, globally available
⚗️ Yamasa
Choshi, Chiba
Balanced koikuchi, founded 1645
✨ Higashimaru
Tatsuno, Hyogo
Gold standard usukuchi for Kansai cooking
🛢️ Marukin
Shodoshima, Kagawa
Premium aged shoyu, traditional wooden barrel fermentation
🏯 Yuasa Shoyu
Yuasa, Wakayama
Artisan craft shoyu, 750+ year brewing history
Shodoshima: Japan's Soy Sauce Island
Shodoshima (小豆島) in Kagawa Prefecture is home to roughly 20 soy sauce breweries on an island you can cross by bicycle in a day. The Marukin Shoyu Museum in Tonosho Port offers free admission, a walk through giant wooden fermentation barrels (kioke), and a shop selling small-batch aged shoyu not available on the mainland. The island is reached by ferry from Takamatsu (60 minutes) or Himeji (100 minutes) and is easily combined with a Shikoku or Osaka trip.
Yuasa town in Wakayama Prefecture is considered the historic birthplace of Japanese soy sauce — shoyu production here dates to the 13th century. Small artisan breweries welcome visitors during open-house events in October and November, when the autumn fermentation season is in full swing.
Stay in Tokyo — Tsukiji & Condiment Shopping
Tokyo's Tsukiji Outer Market remains one of Japan's best places to buy premium shoyu, ponzu, and mirin directly from specialist condiment vendors. Look for Ippudo Shoyu (aged tamari blends), yuzu-infused soy sauces, and single-origin artisan bottles. Combine with a morning tuna auction visit to Toyosu Market (tickets required, book weeks ahead) and brunch at the outer market stalls serving fresh tamagoyaki and sashimi bowls.
Frequently Asked Questions
What are the 5 main types of Japanese soy sauce?
The 5 main types of Japanese shoyu are: (1) Koikuchi — the standard dark soy sauce used across most of Japan, accounting for about 80% of production; (2) Usukuchi — lighter in color but saltier, preferred in Kansai (Kyoto/Osaka) for preserving the colors of vegetables and dashi-based dishes; (3) Tamari — thick and rich, made primarily from soybeans with little or no wheat, popular in Nagoya and the Tokai region; (4) Saishikomi — double-brewed by fermenting soy sauce in existing soy sauce instead of brine, giving an intensely complex umami flavor; (5) Shiro — white soy sauce, very pale and sweet, used in refined Kyoto cuisine to add flavor without darkening the dish.
What is the difference between koikuchi and usukuchi shoyu?
Koikuchi (dark soy sauce) and usukuchi (light soy sauce) differ mainly in color, saltiness, and regional use. Koikuchi is darker brown, with a balance of saltiness and umami, and is used across all of Japan for general cooking, dipping, and marinades. Usukuchi is golden-amber in color but actually contains more salt (about 18–19% vs 16% for koikuchi) to compensate for its less fermented, milder flavor. Chefs in Kyoto and Osaka prefer usukuchi to keep broths, simmered vegetables, and tofu dishes visually light — a practice called "preserving the color (iro o tomeru)."
Where is Japanese soy sauce made — what is Shodoshima?
Shodoshima (Sho-do-shi-ma) is a small island in the Seto Inland Sea, Kagawa Prefecture, and is considered Japan's soy sauce island. About 20 traditional soy sauce breweries operate on the island, many still using centuries-old wooden barrels (kioke) for fermentation. Marukin Shoyu, one of Japan's most respected brands, is based here and runs a soy sauce museum (Marukin Shoyu Museum) where you can see the traditional production process and buy premium aged shoyu. Shodoshima is reachable by ferry from Takamatsu in about 60 minutes.
What are the best Japanese soy sauce brands to buy?
Top Japanese soy sauce brands to look for: Kikkoman — the world's most recognized brand, produced in Noda (Chiba Prefecture), reliable for everyday koikuchi. Yamasa — founded in 1645 in Choshi (Chiba), excellent balance and depth. Higashimaru — Hyogo Prefecture brand specializing in usukuchi (light soy sauce), the gold standard for Kansai-style cooking. Marukin — from Shodoshima island, known for premium aged shoyu and traditional wooden barrel fermentation. Yuasa Shoyu — from Yuasa town in Wakayama, considered the birthplace of Japanese soy sauce with over 750 years of history.
Can I do a soy sauce tasting tour in Japan?
Yes — Shodoshima island in Kagawa Prefecture is the best place for a dedicated shoyu tasting experience. The Marukin Shoyu Museum offers free entry, hands-on exhibits about soy sauce fermentation, and a shop selling premium aged soy sauce unavailable outside the island. In Noda City (Chiba Prefecture), Kikkoman runs factory tours (reservations required). In Yuasa town (Wakayama), small historic breweries open their doors for tasting and sake-shoyu pairing events, especially in autumn.
How should I use different types of shoyu in cooking?
Use each shoyu type according to its strengths: Koikuchi is the all-purpose choice — good for teriyaki, stir-fries, ramen tare, and dipping gyoza. Usukuchi suits clear soups, nimono (simmered dishes), and egg dishes where you want flavor without darkening the food. Tamari is excellent for dipping sashimi (its thickness clings better), glazing yakitori, and as a dipping sauce for noodles. Saishikomi (twice-brewed) is best used sparingly as a finishing sauce for tofu, raw fish, or carpaccio — its intense umami means you use less. Shiro (white) shoyu works in chawanmushi (savory egg custard), marinades for white fish, and any dish where a clear broth appearance is essential.