Grammarly vs QuillBot: Which Is Better for English Writing?

Key differences

Both are English writing tools with grammar checking, browser extensions and generative rewriting, so their feature lists look alike. Their starting points differ, though: Grammarly is a gatekeeper, QuillBot is a rewriter.

Grammarly is built around correction and being everywhere. Once the extension or desktop app is installed, almost any text box on the web or in office apps is checked in real time for spelling, grammar, punctuation, wordiness and tone. Suggestions come with explanations, so long-term use improves your own English. Generative rewriting arrived later and leans toward a generic business tone.

QuillBot is built around paraphrasing. You paste in a passage, choose a style such as more formal, more concise or more fluent, set how much changes with a slider, and click words for synonyms. Around that it adds grammar checking, summarising, citation generation, translation and AI-content detection. None is best-in-class alone, but having them together is convenient.

Their risks differ too. Grammarly reads what you type wherever you type it, so be careful with sensitive content and compliance. QuillBot’s rewrites can quietly shift meaning, so technical terms and key arguments need checking sentence by sentence; using it to launder someone else’s text past plagiarism checks is misconduct, and its AI detector is only a rough signal.

Choose Grammarly if

• You write a lot of English emails and messages at work and want them checked before sending.
• You are preparing cover letters, CVs or other low-tolerance documents that need careful checking.
• You want to know whether your tone reads as abrupt or too casual and adjust it.
• You want explanations that gradually improve your own English.

Choose QuillBot if

• Your own sentences sound unnatural and you want a better way to say them.
• You need varied wording to avoid repetition within one piece.
• You are writing papers and need reference entries in APA, MLA or similar styles.
• You want summaries to grasp the gist of English material quickly.

If you are in mainland China

Both can be used from China and both have free versions: Grammarly’s basic corrections are free, and QuillBot’s free version covers light everyday use. Both are English-focused and will not help with Chinese. For students abroad and anyone writing papers in English, a practical combination is to rework awkward sentences in QuillBot, then give the result a final grammar pass in Grammarly. If you can only pick one, professionals writing frequent English emails should choose Grammarly, and students focused on papers, rewording and citations should choose QuillBot. Before pasting confidential business material or unpublished research, check your organisation’s compliance rules.