Compounds that begin with a proper noun often trip writers: the proper noun gets lowercased (windows-based) or the dash is wrong (New York-based vs New York-based). Below are compact rules, copy-paste corrections, many contextual examples, rewrite templates, and quick checks you can use immediately.
Quick answer
Keep the proper noun capitalized and link it to the descriptor-usually with a hyphen for single-word names and an en dash for multiword names. If unsure, rewrite to avoid ambiguity.
- Single-word proper noun + based → hyphen: Windows-based, Microsoft-based.
- Multiword proper noun + based → en dash preferred: New York-based (hyphen acceptable if you can't use an en dash).
- Abbreviations follow your style guide: U.S.-based vs US-based.
- Respect brand stylization: iPhone-based keeps Apple's capitalization.
Core explanation: the single rule
If the first word is a proper noun, keep its capitalization and connect it to the descriptor. Lowercasing a name (windows-based) reads like a typo and can change meaning.
- Rule: Proper noun stays capitalized + glue (hyphen or en dash) + descriptor.
- When unclear, rewrite: "based in New York" or "for Windows."
- Wrong: We support windows-based machines.
- Right: We support Windows-based machines.
Hyphenation and en dash: when to use which
Use a hyphen for single-word names (Linux-based). Use an en dash to join a multiword name to a descriptor (New York-based) because it links the full name to the modifier. If you can't type an en dash, a hyphen is acceptable-be consistent.
- Single-word name: Windows-based, Oxford-based.
- Multiword name: New York-based (preferred) or New York-based (acceptable).
- Abbreviations: U.S.-based (with periods) vs US-based-follow your style guide.
- Wrong: New York-based author sent his draft. (ambiguous if treating "New" as separate)
- Right: New York-based author sent his draft.
- Wrong: us-based supplier will provide the parts.
- Right: U.S.-based supplier will provide the parts.
Spacing, punctuation, and brand stylization
No spaces around hyphens or en dashes (Windows-based, not Windows - based). Honor official brand capitalization even when it's nonstandard (iPhone-based). Possessives keep both correct forms: the company's Windows-based tool.
- No spaces around the dash: New York-based or New York-based.
- Respect brand stylization: iPhone-based, eBay-based.
- Possessives: the company's Windows-based tool (both the possessive and capitalized name remain).
- Casual - Wrong: We tested an iphone - based camera filter.
- Casual - Right: We tested an iPhone-based camera filter.
- Wrong: The company's windows-based tool crashed.
- Right: The company's Windows-based tool crashed.
Examples (copy-paste) - work, school, casual
Paired wrong→right examples for common contexts. Pick the tone that matches your audience.
- Work - Wrong: We hired a windows-based software engineer.
- Work - Right: We hired a Windows-based software engineer.
- Work - Wrong: Our us-based office will handle logistics.
- Work - Right: Our U.S.-based office will handle logistics.
- Work - Wrong: The New york-based team sent an update.
- Work - Right: The New York-based team sent an update.
- School - Wrong: We ran a harvard-based study on sleep patterns.
- School - Right: We ran a Harvard-based study on sleep patterns.
- School - Wrong: oxford-based researchers published the paper.
- School - Right: Oxford-based researchers published the paper.
- School - Wrong: The linux-based lab environment failed the update.
- School - Right: The Linux-based lab environment failed the update.
- Casual - Wrong: Try this instagram-based recipe trend.
- Casual - Right: Try this Instagram-based recipe trend.
- Casual - Wrong: Check out the youtube-based tutorial I found.
- Casual - Right: Check out the YouTube-based tutorial I found.
- Casual - Wrong: That iphone-based filter is everywhere.
- Casual - Right: That iPhone-based filter is everywhere.
Real usage: tone, formality, and when to rewrite
Match your punctuation to the context. Formal writing favors en dashes for multiword names; product copy accepts short hyphenated forms. When a hyphenated compound feels clumsy or unclear, rewrite for clarity.
- Formal: prefer an en dash for multiword names and consistent abbreviation style.
- Product/UI: hyphenated single-word names are concise and fine (Windows-based installer).
- When clarity matters: rewrite to "based in New York" or "an app for Windows."
- Formal example: "New York-based respondents showed a higher average."
- Work example: Product UI: "Windows-based installer" (concise).
- Casual example: Blog clarity: "an app for iPhone users" instead of "iPhone-based app."
Try your own sentence
Test the whole sentence, not just the phrase-context usually makes the right form obvious. Paste a sentence into a checker or apply a quick rewrite if it feels awkward.
Rewrite help: three templates + quick checklist
If you don't want to worry about dashes or capitalization, these rewrites avoid errors and often read better. Use the checklist before sending.
- Checklist: 1) Identify the proper noun; 2) Capitalize it; 3) Choose hyphen or en dash, or rewrite.
- Rewrite templates:
- Rewrite:
Original: "She joined a New York based company." → "She joined a company based in New York." - Rewrite:
Original: "We deployed a windows-based app." → "We deployed an app for Windows." - Rewrite:
Original: "U.S.-based suppliers are preferred." → "Suppliers based in the U.S. are preferred."
Grammar quick checks
Fast verifications that catch most mistakes-run these before you send a sentence.
- Is the first word a proper noun? If yes, capitalize it.
- Is it a multiword name? Prefer an en dash between the full name and the descriptor.
- Are there extra spaces around the dash? Remove them.
- Does the brand use unusual capitalization? Use the brand form (iPhone-based).
- Wrong: our microsoft-based plugin failed.
- Right: Our Microsoft-based plugin failed.
Memory trick and quick rules to remember
Mnemonic: "Proper name stays proper; glue it." Keep the capital letter, then glue the next word with a hyphen or en dash.
Quick rules: Single-word name → hyphen. Multiword name → en dash. If confused → rewrite.
- Think: Proper + glue (hyphen/en dash) + based = Capital stays.
- When speed matters: rewrite to "based in" or "for" to avoid punctuation questions.
- Usage: Windows + -based = Windows-based (proper stays capitalized).
Similar mistakes to watch for
The same capitalization logic applies to demonyms and adjectives formed from proper nouns. Also check interactions with possessives and other punctuation.
- Demonyms: french → French (French cuisine).
- Adjectives from proper nouns: christian → Christian (Christian values).
- Possessives with hyphenation: the company's Windows-based tool (keep both correct).
- Wrong: french cuisine is delicious.
- Right: French cuisine is delicious.
- Wrong: Our microsoft-based plugin failed.
- Right: Our Microsoft-based plugin failed.
FAQ
Do I always need an en dash for multiword names?
Many style guides prefer an en dash because it links the whole name to the descriptor. If your tools don't support en dashes, a hyphen is acceptable-just be consistent.
Should I use U.S.-based or US-based?
Follow your organization's style. Journalistic and academic guides usually use U.S.-based with periods; internal or tech styles may use US-based. Either is fine if you stay consistent.
What about brands with unusual capitalization like iPhone?
Respect the brand's official capitalization: iPhone-based is correct even if a grammar tool flags it.
Is it better to rewrite a hyphenated phrase?
Often yes-rewrites like "based in New York" or "an app for Windows" avoid punctuation issues and read clearer, especially in formal writing.
Quick way to check a sentence before sending?
Run the checklist: identify the proper noun (capitalize it), decide hyphen vs en dash (or rewrite), remove spaces around the dash. If unsure, paste the sentence into a checker or use a rewrite template.
Want a quick fix for one sentence?
Use a grammar checker or apply one of the rewrite templates above for a fast fix. Tools help spot capitalization and hyphenation slips-then apply your chosen style consistently.