QuillBot vs Undetectable AI: Which Should You Choose in 2026?
Both prices below were read from each vendor's own pricing page on the date shown.
Pricing side by side
| Plan | QuillBot | Undetectable AI |
|---|---|---|
| tier 1 | Free — 125 words in Paraphraser, Standard & Fluency modes, basic grammar checker | $9.99/mo — 10,000 words a month |
| tier 2 | $19.95/mo — Unlimited words in Paraphraser, all 8 rephrasing modes, plagiarism checker, full AI tone analysis | $19/mo — 20,000 words a month |
| tier 3 | $99.95/mo — Billed annually ($8.33/mo), unlimited Paraphraser, tone detector, team sharing | $31/mo — 35,000 words a month |
| tier 4 | — | $42.5/mo — 50,000 words a month, all features |
read from both vendors' pricing pages · 23 Aug 2026 · how we verify
Choose QuillBot if
- Students, researchers, and copywriters looking to rephrase sentences and avoid repetitive language
- Writers needing automated grammar proofreading and citation formatting
Choose Undetectable AI if
- Content writers and copywriters seeking to eliminate robotic phrasing in AI drafts
- Students and marketers validating content against AI detection heuristics
Where each one disappoints
QuillBot
- Teams looking for automated ad budget optimization across Google and Meta Ads
Undetectable AI
- Technical documentation where precise legal or coding syntax must remain unaltered
Compiled by Stepan Noianov from both vendors' own sites. Something wrong? Report an inaccuracy.