Tamari vs. Soy Sauce: Key Differences and How to Substitute

Quick Answer

Tamari is a Japanese soy sauce traditionally made without wheat, giving it a darker color, richer umami, and often a thicker body than regular soy sauce. If you're gluten-sensitive, tamari is a reliable soy sauce alternative, but expect a slightly deeper flavor and a bit less salinity. For most recipes, you can substitute tamari for soy sauce in equal amounts, but adjust the salt to taste.

If you've ever stood in the condiment aisle wondering whether to grab tamari or soy sauce, you're not alone. They look similar, come in similar bottles, and both add a salty, savory punch to stir-fries, marinades, and dipping sauces. But the two are not interchangeable in every situation. The biggest difference comes down to wheat: traditional soy sauce is brewed with soybeans and wheat, while tamari is made with little or no wheat.

Momofuku Goods, known for its restaurant-grade pantry staples, offers a Soy Sauce that's steeped with kombu for extra depth. If you're exploring soy sauce options, a high-quality bottle can elevate a simple dish. This guide breaks down the differences, helps you choose, and shows you how to swap one for the other without ruining your meal.

What Is Tamari?

Tamari is a type of soy sauce that originated in Japan. It's traditionally made from soybeans, salt, water, and a small amount of alcohol or other ingredients, but crucially, it often contains little to no wheat. This makes it a popular choice for people who avoid gluten or are sensitive to it. However, not all tamari is 100% gluten-free, so check the label if that's a concern.

Compared to standard soy sauce, tamari tends to be darker, thicker, and less salty, with a more pronounced umami flavor. It's less sharp and more rounded, which is why some cooks prefer it for dipping delicate foods like sushi. The absence of wheat also means it can behave differently in cooking—it might not thin out as much as soy sauce, and its flavor can dominate if you're not careful.

• Look for tamari labeled 'gluten-free' if you need to avoid wheat entirely.
• The richer flavor of tamari pairs well with simple dishes where you want the sauce to shine.

What Is Soy Sauce?

Soy sauce is a broader category, but the most common type you'll find is brewed from soybeans, roasted wheat or barley, salt, water, and a fermentation culture. The wheat contributes sweetness, aroma, and a lighter color compared to tamari. Chinese soy sauce often has a more intense salty kick, while Japanese soy sauce is softer and sweeter.

Because soy sauce contains wheat, it's not suitable for a gluten-free diet unless it's specifically labeled gluten-free and made with an alternative grain. The flavor is sharper and saltier than tamari, which makes it an excellent all-purpose seasoning. The wheat also helps soy sauce thin out and coat foods evenly, which can be an advantage in marinades and glazes.

• Korean BBQ sauces, like Momofuku's variety pack, often blend soy sauce with other ingredients to create a balanced sweet-and-savory profile.

Tamari vs. Soy Sauce: Flavor and Use Differences

When you taste them side by side, tamari is darker, richer, and less salty than most soy sauces. Soy sauce has a brighter, sharper saltiness with a hint of sweetness from the wheat. In a raw dipping situation, tamari's smoothness can be more pleasant, but in a marinade, soy sauce might cut through fat better.

In cooking, the differences become practical. Because tamari is thicker, it may cling to food more easily, which is great for glazes but can be too heavy for a light broth. Soy sauce, being thinner, integrates more seamlessly into soups and braises. For a dish that relies on a delicate balance, you might want to stick with the sauce the recipe calls for, but if you're in a pinch, a simple swap works.

• Use tamari in dipping sauces, salad dressings, and glazes where you want depth without extra salt.
• Choose soy sauce for stir-fries, marinades, and soups where a thin, even coating is ideal.

How to Substitute Tamari and Soy Sauce

In most recipes, you can substitute tamari for soy sauce in equal amounts. Because tamari is slightly less salty, you might need to add a tiny pinch of salt to reach the same seasoning level. Conversely, if you're using soy sauce in place of tamari, start with less soy sauce and adjust—soy sauce is saltier, and its thinner consistency might change the texture of a sauce.

Flavor-wise, tamari adds a deeper, almost earthy umami, while soy sauce brings a brighter, more complex saltiness. If the recipe is simple, like a fried rice or a noodle dish, the swap is easy. For a recipe that relies on the specific color or thickness, such as a dark glaze, tamari's richer hue can be an advantage.

• Start with a 1:1 ratio, then taste and adjust salt or add a splash of water if needed.
• In a pinch, you can dilute tamari with a bit of water to mimic the thinner consistency of soy sauce.

Tamari vs. Soy Sauce: The Trade-Offs

• Gluten-Free Need: Tamari is often gluten-free, but not always. Soy sauce commonly contains wheat. If you require strict gluten avoidance, choose tamari that is explicitly labeled gluten-free. Always read the label for gluten-free certification.
• Flavor Profile: Tamari is deeper, richer, and less salty. Soy sauce is brighter, saltier, and more complex due to wheat. The right choice depends on whether you want a mellow umami or a punchy salty kick. For delicately flavored dishes, tamari may be less intrusive.
• Cooking Behavior: Tamari is thicker and clings to food; soy sauce thins out and coats evenly. In marinades or glazes, use tamari for a rich coating; in soups, soy sauce integrates better. Adjust consistency with a bit of water for tamari in thin sauces.

Momofuku Goods Pantry Solutions

• Soy Sauce: Meet Momofuku Soy Sauce. If you’re used to grocery store soy sauce, you’ve never had anything like this. Our restaurant-grade version is steeped with kombu to unlock a world of depth and flavor. It’s built on 10 years of flavor research from the Momofuku Goods team and we’re making it available to home cooks for the first time. If you're looking for a premium soy sauce that brings restaurant-quality umami to home cooking, the kombu infusion adds an extra layer of savoriness that pairs beautifully with stir-fries, marinades, and dipping sauces.
• Soy & Scallion Noodles | 12 Packs: Momofuku Goods Soy & Scallion Noodles come in a convenient 12-pack, offering a pantry staple for quick and flavorful meals. These noodles are designed to bring the savory taste of soy and scallion to your table with ease. When you're deciding between tamari and soy sauce, a product like Soy & Scallion Noodles shows how much flavor a quality soy-based sauce can bring. The noodles make it simple to enjoy a satisfying meal without extra prep, and you can even add a splash of your chosen sauce for an extra kick.

Which Should You Choose?

Best for

• Gluten-sensitive cooks who want a flavorful soy sauce alternative
• Dipping sauces and glazes where a deeper umami and lower saltiness shine

Not for

• Recipes that require precise saltiness without adjusting measurements
• Clear broths where a thinner, brighter saltiness is crucial

Both tamari and soy sauce have a place in your kitchen. Tamari brings a gluten-friendly, richer alternative for those who need it or simply prefer its mellow depth. Soy sauce offers a familiar, versatile saltiness that works in almost any dish. Whatever you choose, using a high-quality product—like Momofuku Goods' Soy Sauce—can make a noticeable difference. Try them side by side and let your taste buds decide.