AP vs APA Title Case: What Is the Difference? | TitleCasePro

Quick answer: AP and APA differ on prepositions. AP capitalizes any word of four or more letters, so With, From, Into, Over are capitalized. APA lowercases all prepositions regardless of length. AP is for journalism; APA is for academic research.

AP (Associated Press) and APA (American Psychological Association) have confusingly similar acronyms but serve completely different audiences — and they use opposite logic for capitalizing prepositions.

The Fundamental Difference

The core split: AP uses a length rule (capitalize words of 4+ letters). APA uses a category rule (lowercase all prepositions regardless of length). These two systems produce different results on any title containing a 4+ letter preposition.

	AP	APA
Used for	Journalism, news, PR	Academic research, social sciences
Preposition logic	Length-based (4+ letters → capitalize)	Category-based (all prepositions → lowercase)
with, from, into	Capitalize	lowercase
about, between	Capitalize	lowercase

Side-by-Side Examples

Title	AP	APA
Gone with the Wind	Gone With the Wind	Gone with the Wind
A Study about Memory	A Study About Memory	A Study about Memory
Learning from Failure	Learning From Failure	Learning from Failure
Notes on the Future	Notes on the Future	Notes on the Future

The last row is identical because on (2 letters) and the (article) are lowercase in both styles. The differences only appear with longer prepositions.

The Word That Tells Them Apart

Watch the word “with” (4 letters). It is the cleanest test:

• AP: With → capitalized (4 letters meets the threshold)
• APA: with → lowercase (it’s a preposition)

If you see “With” capitalized mid-title, you’re looking at AP. If it’s lowercase, it’s APA (or Chicago or MLA).

Quick Comparison Table

Rule	AP	APA
First and last word	Capitalize	Capitalize
Nouns, verbs, adjectives, adverbs	Capitalize	Capitalize
Prepositions ≤ 3 letters	lowercase	lowercase
Prepositions 4+ letters	Capitalize	lowercase
Articles (a, an, the)	lowercase	lowercase
Coordinating conjunctions	lowercase	lowercase
Infinitive to	Capitalize	lowercase
First word after colon	Capitalize	Capitalize

⚠️ Another giveaway: AP capitalizes “To” in infinitives (How To Build), while APA keeps it lowercase (How to Build). This is a second reliable way to tell the two apart.

Which Should You Use?

• Use AP if you are writing news articles, press releases, blog posts in a journalistic voice, or marketing copy. AP is the US media standard.
• Use APA if you are writing academic papers in psychology, education, nursing, business, or the social sciences.

They are rarely interchangeable — your field or publication dictates which one applies.

Try Both on Your Title

Use the compare tool to see your title in AP, APA, and all other styles side by side. Or use the dedicated capitalizers:

• AP title capitalizer
• APA title capitalizer

Related Articles

• APA vs Chicago Title Case
• MLA vs APA Title Case
• What Is AP Style Title Capitalization?
• Is “with” Capitalized in a Title?
• Title Capitalization Rules: The Complete Guide