This is another question I receive very often.
The short answer is...
No.
They are similar because both are natural bread cultures.
But they are not exactly the same.
Both rely on naturally occurring yeasts and beneficial bacteria to ferment dough.
The biggest difference lies in how they are started.
Sourdough Starter
A traditional sourdough starter usually begins with only two ingredients.
Whole wheat flour (or another flour)
Water
That's it.
The naturally occurring yeasts and bacteria already present in the flour and surrounding environment slowly begin multiplying.
Because no extra ingredients are added to encourage fermentation, sourdough usually takes several days before it becomes strong enough to bake bread reliably.
Patience is the main ingredient.
Khamir
Traditional khamir begins differently.
It uses four simple ingredients.
Whole wheat flour
Water
Fresh curd
Jaggery, sugar or honey
These extra ingredients create favourable conditions for fermentation right from the beginning.
The curd contributes beneficial bacteria.
The sweetener provides easily available food during the early stage of fermentation.
As a result, khamir often becomes active much more quickly than a traditional sourdough starter.
That is one of the reasons it has remained popular in many traditional Indian kitchens.
What Happens After The First Batch?
Here is something many people don't realise.
Once your khamir becomes active, you no longer need to keep adding curd and jaggery every time you feed it.
Just like a sourdough starter, an established wet khamir can be maintained by regularly feeding it with only fresh flour and water.
The microorganisms are already living inside the culture.
Your job is simply to give them fresh food from time to time.
In other words...
The curd and sweetener help start the journey.
They don't need to remain part of every feeding.
Do They Contain The Same Microorganisms?
Not exactly.
Both sourdough and khamir contain communities of naturally occurring yeasts and beneficial bacteria.
The exact microorganisms differ from one kitchen to another because they depend on the flour, the environment, the temperature and many other factors.
Researchers studying sourdough around the world have frequently found yeasts such as Saccharomyces cerevisiae, Kazachstania humilis (formerly Candida humilis) and Wickerhamomyces anomalus.
Among the beneficial bacteria, members of the Lactobacillus group (now reclassified into several related genera, including Lactiplantibacillus and Limosilactobacillus) are commonly reported in mature sourdough starters.
Traditional Indian khamir has not been studied as extensively as sourdough.
However, because it begins with flour and curd, it is also expected to contain naturally occurring yeasts together with lactic acid bacteria. The curd contributes bacteria such as Lactococcus, Lactobacillus and related lactic acid bacteria, while the flour and surrounding environment contribute wild yeasts. Over time, the exact community changes and adapts to your own kitchen.
That is why no two homemade cultures are ever exactly alike.
Which One Is Better?
I don't think this is the right question.
I prefer asking a different one.
Which one suits your lifestyle better?
If you enjoy maintaining a traditional starter and don't mind regular feeding, sourdough is a wonderful choice.
If you prefer a quicker start and eventually want to preserve that culture as homemade yeast powder, khamir may suit you better.
Both are beautiful examples of natural fermentation.
Neither is "right" or "wrong."
Each has its own history.
Its own character.
Its own place in the kitchen.
Science Made Simple
Think of sourdough and khamir as two families starting the same journey from different roads.
One begins slowly with only flour and water.
The other gets an early helping hand from curd and a little sweetness.
Eventually, both develop into living communities of yeasts and beneficial bacteria that can naturally ferment bread dough.
That is why both methods have been treasured for generations.
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