QuillBot vs Originality.ai

QuillBot is a well-known AI writing toolkit built around its paraphraser, with a grammar checker, summarizer, AI detector, plagiarism checker, humanizer, translator and citation generator alongside. The free plan gives you two paraphrasing modes and no sign-up for basic use, while Premium unlocks Formal, Academic, Creative, Humanize and Custom modes. QuillBot only shows Premium prices after you create an account, so compare billing terms carefully at checkout.

• ✓Free paraphraser with Standard and Fluency modes, no sign-up needed to try
• ✓Premium adds Formal, Simple, Creative, Academic, Expand, Shorten, Humanize and Custom modes
• ✓Synonym slider and click-to-swap AI thesaurus for fine control

• –Premium prices are shown only after you create an account
• –Most paraphrasing modes and the Humanize mode are Premium-only

Originality.ai is built for people who buy or publish content at scale: AI detection, plagiarism checks, fact checking and readability in one credit-based tool. Its free tier is enough for occasional checks, and Pro is affordable for a working editor. Like every AI detector, it can produce false positives, so treat scores as evidence, not proof.

• ✓AI detection plus plagiarism, fact checking, readability and grammar in one tool
• ✓Vendor reports 97.8% accuracy for its multilingual model across 30 languages
• ✓Free scans without an account (up to 3 a day, 2,000 words each)

• –Credit-based: one credit covers 100 words, and AI plus plagiarism costs 2 credits per 100 words
• –Monthly subscription credits do not roll over