* The ability to save changes on almost any desktop HTML5 compatible-browser, with custom apps to enable [[Saving on iPad/iPhone]] and [[Android|Saving on Android]], and a cross-platform [[Firefox extension|Saving with TiddlyFox]] that even runs on Android
* TiddlyWiki isn't just a wiki - you can build custom applications with it like this TaskManagementExample
* Familiar user interface elements like <$button message="tw-modal" param="SampleWizard" class="btn btn-inverse">wizards</$button> and <$button message="tw-notify" param="SampleNotification" class="btn btn-inverse">notifications</$button>
** TiddlyWiki version 5 can directly build both itself and previous (2.x.x) versions of TiddlyWiki from their constituent separate files, without needing external tools
The deep internal changes mean that TiddlyWiki version 5 is not compatible with previous versions, using different plugins, themes and so on. Content prepared for previous versions of TiddlyWiki will need massaging to work properly. When asking or searching for help be sure to specify TiddlyWiki5 (or TW5).