UI Terminology: Logon vs Login

I am crafting an application and cannot decide whether to use the terms Login/out or Logon/off . Is there a more correct option between these two? Should I use something else entirely (like "Sign on/off").

In terms of usability, as long as I am consistent it probably doesn't matter which terms I choose, but I did wonder about the origins of the terms - and whether one or another makes more grammatical sense. I also care deeply about the application I am creating, and want to take the time to investigate all aspects of its user experience.


Since you're looking for correctness,

login, logout, logon, and logoff are all nouns :

"Please enter your login credentials."
"I see three logons but only two logoffs from this user."

The corresponding verbs are each two words:

"Please log in to see your reputation."
"You must log off and talk to a human."

Update: according to dictionary.com, the various definitions of login are all nouns and involve gaining access to a computer or computer service. Interestingly, logon redirects to login as an exact equivalent. Have the definitions evolved?


民主之声:谷歌结果的期限/数量:

login    2,020,000,000
sign in    430,000,000
logon       27,700,000
log on      18,200,000
logout      83,500,000
log out     34,500,000
sign out    19,400,000
log off      5,350,000

Logon is used for a hardware system that starts up when used, like a computer.

Login is used for a software system where I have to enter my username and password.

Signin is used for identification, either physical such as a photo ID, or digital such as OpenID. What differs here from login is that in the case of an ID, I can use the same ID to access multiple sites, buildings, etc.

Edit 1: I should've added a disclaimer that I have no sources and make no guarantee that these are the official usage of the words. The definitions I'm offering about are based on my personal understanding of the usage, and are purely opinion.

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