Sign up or signup?
sign up is a verb meaning “To add a name to the list of people who are participating in something”; signup is a noun meaning “Alternative spelling of sign-up”. sign up is written as two words and signup as one word; they are used differently.
What is the difference between sign up and signup?
| sign up | signup | |
|---|---|---|
| Part of speech | verb, noun | noun |
| Meaning | To add a name to the list of people who are participating in something To add one's own name to the list of people who are participating in something (including amateur, but not professional, teams) The act of signing up, as for a commercial service or a committee | Alternative spelling of sign-up |
| Example | We signed Bob up for kitchen cleanup duty | none recorded |
| Forms | none | signups |
| Pronunciation | /ˈsaɪnˌʌp/ | not recorded |
| In writing | not counted (the list counts single words) | 1.1 times per million words |
Sources: sign up and signup in the English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0); written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media).
Every current meaning of sign up and signup
sign up
- 1
To add a name to the list of people who are participating in something
We signed Bob up for kitchen cleanup duty
- 2
The act of signing up, as for a commercial service or a committee
- 3
To add one's own name to the list of people who are participating in something (including amateur, but not professional, teams)
Coordinate term: sign in
- 4
To agree to purchase some good or service
After much deliberation we decided to sign up for satellite TV
- 5
To enlist in the armed forces
Didn't you hear? He's just signed up!
signup
- 1
Alternative spelling of sign-up
Source: the English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0); obsolete, archaic, dialect and rare senses left out.
Which is more common, sign up or signup?
sign up is a phrase, which the list of single words does not count; signup 1.1 times per million words.
Source: written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media).
How many people search sign up vs signup?
“sign up vs signup” is searched about 720 times a month on Google and 20 on Bing in the United States. Google counts close variants of a query together (“signup vs sign up”, “sign up or signup”).
Sources: Google Ads keyword data through DataForSEO and Microsoft Advertising keyword data through DataForSEO, the average month from September 2025 to August 2026.