Developer: GPTHuman | Free Plan: Yes (300 words Humanizer output) | Starting Price: $8.25/month | Best For: Writers and students wanting a quick humanize pass, and developers embedding humanization via the API

Developer: Phrasly | Free Plan: Yes (trial, ~300 words) | Starting Price: $19.99/month (Unlimited plan) | Best For: Students and professionals polishing technical drafts, and businesses wanting a white-label humanization API

Developer: WriteHuman | Free Plan: Yes (3 requests/month, 250 words each) | Starting Price: $12/month billed annually (Basic plan) | Best For: Content marketers wanting a multi-surface humanizer, and developers connecting humanization via MCP

Developer: Originality.ai | Free Plan: No permanent free plan | Starting Price: $14.95/month billed monthly (Pro plan) | Best For: Content marketers and SEO teams verifying originality, and agencies needing bulk AI and plagiarism scanning

Developer: Copyleaks Ltd. | Free Plan: No permanent free plan | Starting Price: $16.99/month billed monthly (Personal plan) | Best For: Educators needing LMS-integrated AI detection, and enterprises needing multi-language, multi-format scanning

Developer: Winston AI (gowinston.ai) | Free Plan: Yes ($0/month, 2,000 credits, 14-day trial) | Starting Price: $18/month billed monthly (Essential plan) | Best For: Publishers and institutions needing both text and image AI detection

Developer: GPTZero, Inc. | Free Plan: Yes, free scans up to 10,000 characters | Starting Price: See official pricing page for current rates | Best For: Educators, students, writers, publishers

Developer: QuillBot LLC | Free Plan: Yes ($0/month, 125-word Paraphraser limit) | Starting Price: $19.95/month billed monthly (Premium plan) | Best For: Students needing paraphrasing and citations, and editors refining drafts for tone and clarity