The best alternative to TinyMCE is CKEditor. It's not free, so if you're looking for a free alternative, you could try CKEditor or ORY Editor. If that doesn't suit you, our users have ranked more than 25 alternatives to TinyMCE and six of them are so hopefully you can find a suitable replacement. Other interesting alternatives to TinyMCE are MediumEditor, tail.writer and Texy!.
CKEditor 4 and CKEditor 5 are easy-to-implement open source JavaScript WYSIWYG rich text editors for any web browser. CKEditor Ecosystem has 2 very distinct rich text editors as well as image upload and collaboration solutions.
MediumEditor is a Medium.com WYSIWYG editor clone, a dead simple inline editor toolbar. Uses contenteditable API to implement a rich text solution.
A tidy, powerful and extendable Markup ([GitHub Flavored] Markdown, BBCode, Textile) Editor, written in Vanilla JavaScript!.
Texy! is a lightweight markup language as well as converter of this format to XHTML, in a form of a library written in the PHP scripting language. It allows the user to write structured documents without knowledge or using of HTML language.
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They're both top-of-the-line open source WYSIWYG HTML editors.