Used and loved by millions
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
they differ
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "they differ" is correct and usable in written English.
You can use it to indicate that two or more subjects are not the same or have different characteristics or opinions. Example: "While both theories are interesting, they differ significantly in their approach to the problem."
✓ Grammatically correct
News & Media
Science
Encyclopedias
Alternative expressions(7)
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
60 human-written examples
Here's how they differ.
News & Media
Yet they differ profoundly.
News & Media
In this, they differ.
News & Media
How do they differ?
News & Media
But they differ on scale.
News & Media
So how do they differ?
News & Media
Jimmy explains how they differ.
News & Media
They differ in their methods of slaughter.
News & Media
But they differ substantially, one from another.
News & Media
Only in silverware do they differ.
News & Media
They differ little from Modern Persian.
Encyclopedias
Expert writing Tips
Best practice
When using "they differ", ensure the context clearly identifies the subjects being compared to avoid ambiguity. For example: "While both strategies aim to reduce costs, they differ in their implementation methods."
Common error
Avoid using "they differ" without specifying how they differ. Simply stating that two things differ without further explanation leaves the reader without a clear understanding. Instead, follow with a clarifying phrase: "They differ significantly in terms of cost and efficiency."
Source & Trust
86%
Authority and reliability
4.5/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "they differ" serves as a comparative verb phrase. It is used to indicate that two or more entities or concepts are not the same and possess distinct characteristics. As supported by Ludwig, the phrase is grammatically sound and frequently used.
Frequent in
News & Media
40%
Science
35%
Encyclopedias
10%
Less common in
Formal & Business
5%
Wiki
0%
Reference
0%
Ludwig's WRAP-UP
In summary, the phrase "they differ" is a grammatically correct and very common way to express distinctions between two or more subjects. Ludwig AI confirms its validity and widespread use. Predominantly found in news, scientific, and encyclopedic contexts, it serves to highlight variations, prompting further explanation. When employing this phrase, ensure clarity by specifying how the subjects differ. Alternatives such as "they vary" or "they diverge" can be used to add nuance. Understanding these subtle differences will enhance the precision and impact of your writing.
More alternative expressions(10)
Phrases that express similar concepts, ordered by semantic similarity:
they diverge
Emphasizes a gradual separation or deviation in path or opinion.
they vary
Highlights the presence of differences in degree, amount, or quality.
they contrast
Focuses on the differences when comparing two or more things.
they deviate
Indicates a departure from a standard or expected course.
they disagree
Specifically refers to differences in opinion or belief.
they are distinct
Emphasizes the clear and recognizable differences between them.
they are dissimilar
Highlights the lack of similarity between the subjects.
they stand apart
Suggests a notable separation or uniqueness.
they are not alike
Directly states the absence of similarity.
they are different
A general term indicating a lack of sameness. A broader expression with the same meaning.
FAQs
How can I use "they differ" in a sentence?
Use "they differ" to point out distinctions between two or more subjects. For example: "Although the two proposals seem similar, "they differ" in their long-term goals."
What can I say instead of "they differ"?
You can use alternatives like "they vary", "they diverge", or "they contrast" depending on the specific nuance you want to convey.
Which is correct, "they differ" or "they are different"?
Both phrases are correct, but "they differ" implies a comparison where specific distinctions are being highlighted, while "they are different" is a more general statement of dissimilarity. The choice depends on the context and the level of detail you want to provide.
What’s the difference between "they differ" and "they are dissimilar"?
"They differ" suggests specific differences, while "they are dissimilar" indicates a general lack of resemblance. "They differ" often implies a more detailed comparison is possible or has been made.
Editing plus AI, all in one place.
Stop switching between tools. Your AI writing partner for everything—polishing proposals, crafting emails, finding the right tone.
Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Source & Trust
86%
Authority and reliability
4.5/5
Expert rating
Real-world application tested