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
so is that
Grammar usage guide and real-world examplesUSAGE SUMMARY
'so is that' is correct and usable in written English as a way of confirming or agreeing with something said previously.
For example: A: She's taking a break from work for a few weeks. B: So is that. She deserves it.
✓ Grammatically correct
News & Media
Science
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
If so, is that justified?
News & Media
So is that quarterback's offense.
News & Media
If so, is that good or bad?
News & Media
So is that shredder.
News & Media
So is that true?
News & Media
So is that good?
News & Media
And if so, is that valuable?
News & Media
So is that commuter from Greenwich.
News & Media
"So, is that like a bad thing?" Fay asks.
News & Media
So is that correct — no change?" He nodded enthusiastically.
News & Media
So is that bleak vision of the future actually realistic?
News & Media
Expert writing Tips
Best practice
Use "so is that" to confirm understanding or to transition to a related question based on the previous statement.
Common error
Avoid using "so is that" when you need to challenge or disagree with the previous statement. It is generally used for confirmation or inquiry.
Source & Trust
87%
Authority and reliability
4.5/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "so is that" primarily functions as an inquiry or confirmation tag. It's used to seek agreement or verify understanding of a preceding statement. As Ludwig AI says, it is "correct and usable in written English as a way of confirming or agreeing with something said previously."
Frequent in
News & Media
60%
Science
20%
Formal & Business
10%
Less common in
Encyclopedias
5%
Wiki
3%
Reference
2%
Ludwig's WRAP-UP
In summary, "so is that" functions as a versatile phrase for seeking confirmation, verifying understanding, or initiating related inquiries. Ludwig AI confirms its correct usage in written English. Its neutral tone allows it to be suitable for various contexts, particularly in news, science, and business. When crafting your content, remember that while common, misinterpreting the intended meaning of the phrase might lead to confusion.
More alternative expressions(6)
Phrases that express similar concepts, ordered by semantic similarity:
is that so
Inverts the word order to emphasize surprise or disbelief.
so that's the case
Reiterates the situation based on the prior statement.
is that correct
Focuses on the accuracy of the preceding statement.
is that right
Seeks validation or agreement.
does that mean
Highlights the implication or consequence of the statement.
then that's it
Indicates acceptance or finality based on the preceding statement.
are you saying that
Clarifies the speaker's understanding of the statement.
in that case
Introduces a conclusion based on the given information.
am I right in thinking that
Seeks confirmation of an understanding or assumption.
is that your understanding
Focuses on confirming another person's interpretation.
FAQs
How can I use "so is that" in a sentence?
You can use "so is that" to confirm something you've heard or understood. For example, if someone says, "The meeting is canceled," you could respond, "So is that. I'll let everyone know."
What's the difference between "so is that" and "is that so"?
"So is that" typically seeks confirmation or understanding, whereas "is that so" /s/is+that+so/ often expresses surprise or mild disbelief.
Which is more formal, "so is that" or an alternative like "is that correct"?
"So is that" is generally neutral, while "is that correct" might be perceived as slightly more direct or formal depending on context.
What can I say instead of "so is that" when I want to show surprise?
If you want to show surprise, you might use alternatives like "really?" or "is that so" /s/is+that+so/ instead.
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
87%
Authority and reliability
4.5/5
Expert rating
Real-world application tested