When comparing Ideone vs ShiftEdit, the Slant community recommends ShiftEdit for most people. In the question“What are the best online IDEs?” ShiftEdit is ranked 6th while Ideone is ranked 12th.
Ranked in these QuestionsQuestion Ranking
Pros
Pro Can execute code against custom input
Pro Supports many languages
Supports languages missing in other similar systems. For example Groovy, Objective-C, SQLite, etc. Shows specific version it supports.
Pro Low cost, high quality
Pro Revision control
Pro Syntax checking
Highlights syntax errors and automatically fix some errors
Pro Supports multiple file access points
Access files from FTP, SFTP, WebDAV, Dropbox, Google Drive or Amazon S3
Pro Supports autocomplete
Code completion for HTML tags, CSS and PHP code assist
Pro SSH support
Allows connecting directly to a server and run commands on that server.
Pro Good Customer Support
Help requests get answered quickly and successfully.
Cons
Con Supports relatively old versions of the languages
For example now after Kotlin 1.3.10 is released it still offers only 1.0.6
Latest Groovy 3.4, but they support only 2.4.7
etc.