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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com
best at what
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "best at what" is correct and usable in written English. You can use it when asking for clarification about someone's specific skills or strengths. Example: "She is the best at what she does, but I'm not sure what that is." Alternative expressions include "best in what" and "top at what."
News & Media
Formal & Business
Science
Alternative expressions(6)
Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Human-verified examples from authoritative sources
Exact Expressions
58 human-written examples
I'm the best at what I do.
News & Media
He's the best at what he does.
News & Media
"And I know I'm the best at what I do".
News & Media
"He's the best at what he does," Jorge Posada said.
News & Media
"Robbie is the best at what he does," Ortiz said.
News & Media
This is why he's the best at what he does, because that's how he feels.
News & Media
"He wanted to try to be the best at what he did".
News & Media
"It doesn't matter what country they're from because they're the best at what they do".
News & Media
Lorne, because he's the best at what he does, is the one who saw it.
News & Media
"I want Shani to be the best at what he does," Thibault said.
News & Media
"These guys are two of the best at what they do," Kelleher said.
News & Media
Expert writing Tips
Best practice
Ensure the clause following "what" clearly identifies the activity or role, such as "the best at what they do" or "the best at what I want to achieve".
Common error
Writers sometimes mistakenly use "best in what" when referring to an action or skill. While "best in the world" is correct for a location, "best at what" is the idiomatic standard for relative clauses describing skills or professions.
Source & Trust
96%
Authority and reliability
4.9/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "best at what" functions as a complex superlative construction. It combines the superlative adjective "best" with the preposition "at" and a relative pronoun "what" to introduce a noun clause. In Ludwig, this structure is frequently observed to specify the exact domain of a person's expertise, acting as a restrictive modifier that clarifies the scope of the excellence being claimed.
Frequent in
News & Media
55%
Formal & Business
25%
Science & Research
10%
Less common in
Encyclopedias
5%
Wiki
3%
Social Media
2%
Ludwig's WRAP-UP
The phrase "best at what" is an essential tool in English for pinpointing excellence. According to Ludwig AI and the analyzed dataset, it is used consistently by major global publications to denote that a subject has reached the pinnacle of their specific craft. Unlike a simple 'the best', this construction is more precise because it creates a direct link between the person and their action (e.g., 'the best at what they do'). It is grammatically correct and highly recommended for professional contexts where specificity adds weight to a compliment or a competitive claim. Whether in sports, business or the arts, using "best at what" helps define a unique value proposition clearly and effectively.
More alternative expressions(10)
Phrases that express similar concepts, ordered by semantic similarity:
unmatched in
Emphasizes that no one else can equal the skill level.
unsurpassed at
Uses a more formal adjective to indicate top-tier status.
unrivaled at
Highlights the absence of any serious competition.
peerless in
A more literary or sophisticated way to say someone has no equal.
top of the field in
Specifies a professional or academic domain clearly.
preeminent at
A very formal alternative denoting superiority and distinction.
expert in what
Focuses on knowledge and mastery rather than just relative rank.
premier in
Often used in business or institutional contexts to denote rank.
leading in
Suggests a position of being at the forefront of a field.
master of
Shifts the focus to total control and understanding of a subject.
FAQs
How do I use "best at what" in a sentence?
You can use it to describe peak performance in a specific role, for example: "She is clearly the "best at what she does" in the marketing department".
What is a more formal way to say "best at what"?
In formal writing, you might prefer phrases like "unsurpassed in", "preeminent in", or "unrivaled at".
Is it "best at what" or "best in what"?
While both can appear, "best at what" is significantly more common when describing the mastery of a craft or job. If you are referring to a category, you might use "best in class".
Can I use "best at what" in business emails?
Yes, it is perfectly appropriate for professional contexts, especially when giving a recommendation or highlighting a company's competitive edge, such as being the "leading provider of" services.
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Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Source & Trust
96%
Authority and reliability
4.9/5
Expert rating
Real-world application tested