TiddlyWiki عبارة عن موقع wiki شخصي ودفتر ملاحظات غير خطي لتنظيم المعلومات المعقدة ومشاركتها. إنه تطبيق wiki مفتوح المصدر ذو صفحة واحدة في شكل ملف HTML واحد يتضمن CSS وJavaScript والمحتوى. لقد تم تصميمه ليكون من السهل تخصيصه وإعادة تشكيله حسب التطبيق. يسهل إعادة استخدام المحتوى من خلال تقسيمه إلى أجزاء صغيرة تسمى الأطفال الصغار.

TiddlyWiki is designed for customization and to be shaped according to users’ specific needs, perhaps comparable to a high-end programming language. As such, it can be shaped into a wide and arbitrary range of special applications. Examples include niche note taking applications, to-do lists, presentations, collections, authoring tools, personal databases, recipe collections, etc.

Although there are many TiddlyWiki documents on the Web, the majority of TiddlyWikis reside on personal computers or in the cloud, or are exchanged over email, in a manner similar to word processing documents and spreadsheets. As a single HTML file, or saved as an HTA file in Microsoft Windows (allowing corporate IE lockdown to be bypassed), TiddlyWiki can be useful in corporate environments where red tape or IT resources might prevent the use of a wiki that requires a more complicated installation.