Name	Compilr	Codiad	Cloud9	CodeEnvy	CompileOnline	IDEOne	ShiftEdit	CodeRun	Koding
URL	compilr.com	codiad.com	c9.io	codenvy.com	compileonline.com/...	ideone.com	shiftedit.net	coderun.com	koding.com
Need Login to Use	Ja	Nein	Ja	Ja	Nein	Nein	Ja	Nein
Need Pay to Use	Yes, free 14 days, then pay: $10 or $20/mth.	No: Open Source	No	No	No: Open Source	No	No	No
C#	Yes	Unknown	No	No	Yes	Yes	Yes	Yes
Other languages	Many	40+	js, css, php	js, css, php	Many	40+	20+	7
Compile	Yes	Unknown	Unknown	Unknown	Yes, Mono 2.10.2.0	Yes	No	Yes
Run	some	Unknown	Unknown	Unknown	Yes	Yes	No	Yes
Syntax Hilight	Ja	Ja	Ja	Ja	Ja	Ja	Ja	Ja
Code-completion	Unknown	Unknown	Yes?	Yes	No	No	No	Yes?
Reference Own Libs	Unknown	Unknown	n/a	n/a	No	No	No	Maybe (did not wrk for me).
Notes	Compile and run console apps in browser. Compile XNA on browser then download result and run it locally.	Install on your own server	1 free private project	Free is public.	Mono 2.10.2.0		Dropbox file store, and others.	By/Uses SharpKit (C# to .js). Debugging. Fully supports opening and editing Visual Studio® solution/project files.	Beta, closed invite.