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
a substantial affect
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "a substantial affect" is not correct in this context; it should be "a substantial effect." You can use "a substantial effect" when discussing the significant impact or influence something has on a situation or outcome.
Example: "The new policy will have a substantial effect on employee productivity and morale."
⚠ May contain grammatical issues
Science
Alternative expressions(20)
a significant impact
effect
a considerable influence
a major effect
a significant effect
a considerable effect
a considerable impact
a major influence
a significant influence
a marked effect
a profound impact
a powerful effect
a strong influence
a tangible effect
a huge affect
a remarkable affect
a tremendous affect
a fundamental affect
a substantial impact
a substantial influence
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
3 human-written examples
None of the constructs had a substantial affect on the growth of the host strain.
Science
Therefore, we think it unlikely that response bias has had a substantial affect on the results, although it is possible that there were differences in the level of deprivation between responders and non-responders.
Science
The fact that there is little evidence that underlying DNA has a substantial affect on histone modifications is perhaps unsurprising; patterns and distributions of histone modifications vary between cell types even when from the same genetic background.
Science
Human-verified similar examples from authoritative sources
Similar Expressions
57 human-written examples
Epilepsy affects 63 400 young people under 18 years of age in the UK. 1 Seizures represent one of the top five avoidable reasons for admission of children to emergency departments in the UK. 2 Aside from seizures, cognitive and behavioural comorbidities cause a substantial impact affecting about two-thirds of children with epilepsy.
As discussed below, this result has substantial affect on the observed mechanical linkage properties.
Science
The time for the tumours in this subset to grow to a detectable size is substantial, affecting primarily the later portion of the RFS curve.
Science
In our study, diabetic mellitus was chosen as it is a common chronic disease that substantial affects quality of life [ 37, 38].
These issues have a substantial impact upon oncology practice, affecting patient's well being and medical workload.
Science
The Turkish electricity distribution and electricity supply businesses have been substantial affected by the transition from a vertically integrated public monopoly model to a model of regulated competition with privatized and unbundled firms.
Science
But the political and economic repercussions could be substantial, affecting both this year's battle over tax cuts and spending and long-range problems like the dire financial outlook for Social Security.
News & Media
This problem is substantial, affecting 1.89% of all United States' energy use.
Science
Expert writing Tips
Best practice
Always double-check your word choice between "affect" and "effect". "Affect" is primarily a verb, while "effect" is primarily a noun. Use "effect" when you mean a result or consequence.
Common error
Don't use "affect" when you mean "effect" as a noun. Remember that "affect" is mainly used as a verb, while "effect" is mainly used as a noun. For example, instead of saying "The decision had a substantial affect", say "The decision had a substantial effect".
Source & Trust
80%
Authority and reliability
2.8/5
Expert rating
Real-world application tested
Linguistic Context
The phrase is intended to function as a noun phrase, describing a significant influence or consequence. However, as Ludwig AI points out, the correct form is "a substantial effect". The examples show the intended meaning, but with the grammatically incorrect "affect".
Frequent in
Science
67%
News & Media
22%
Formal & Business
11%
Less common in
Encyclopedias
0%
Wiki
0%
Reference
0%
Ludwig's WRAP-UP
In summary, while the phrase "a substantial affect" might appear in some sources, it is grammatically incorrect. The correct phrase is "a substantial effect", where "effect" functions as a noun. As Ludwig AI confirms, "affect" is primarily a verb, while "effect" is primarily a noun. To convey the meaning of a significant impact or influence, use "a substantial effect" or consider alternatives such as "a significant impact" or "a considerable influence". Remember to choose the right word to ensure clarity and grammatical accuracy in your writing.
More alternative expressions(6)
Phrases that express similar concepts, ordered by semantic similarity:
a significant effect
Replaces "substantial" with "significant", keeping the core meaning of a considerable impact, while correcting the grammatical error.
a considerable effect
This phrases is perfectly equivalent to the main query but it's grammatically correct.
a considerable impact
Substitutes "affect" with "impact", which is grammatically sound, while maintaining the meaning of a notable influence.
a major influence
Replaces "substantial affect" with "major influence", conveying a strong degree of importance or power.
a significant influence
Interchanges "substantial affect" with "significant influence", expressing a notable power to affect something.
a marked effect
Uses "marked" instead of "substantial", suggesting a noticeable or distinct impact.
a profound impact
Replaces "substantial" with "profound", emphasizing a deep and far-reaching influence.
a powerful effect
Uses "powerful" to suggest a strong and potent impact or change.
a strong influence
Similar to "major influence", but with slightly less emphasis on magnitude.
a tangible effect
Suggests an impact that is concrete and easily perceived or felt.
FAQs
Is it correct to say "a substantial affect"?
No, it is generally incorrect. The correct phrase is "a substantial effect". "Affect" is primarily a verb, whereas "effect" is primarily a noun. When you intend to describe a significant result or consequence, use "effect".
What does "a substantial effect" mean?
It means a significant or considerable impact or consequence. The word "substantial" emphasizes that the "effect" is large and important.
What are some alternatives to "a substantial effect"?
You can use alternatives such as "a significant impact", "a considerable influence", or "a major effect" depending on the specific nuance you want to convey.
When should I use "affect" vs. "effect"?
"Affect" is mainly used as a verb meaning to influence something (e.g., "The weather affects my mood"). "Effect" is mainly used as a noun meaning a result or consequence (e.g., "The weather had a negative effect on my mood").
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
80%
Authority and reliability
2.8/5
Expert rating
Real-world application tested