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Head to head · 2026

QuillBot vs Undetectable AI

Pricing, free plans, ratings, features, pros and cons, side by side. Where one comes out ahead, we mark it.

QuillBot

Started as a paraphraser, grew into a full writing suite

4.5$10/mo

Visit QuillBot (opens QuillBot in a new tab)

Undetectable AI

Detects AI content across text, image, audio and video, and also rewrites text to evade detection

3.2Free

Visit Undetectable AI (opens Undetectable AI in a new tab)

Who comes out ahead

Based only on the facts in our directory. The right pick still depends on the job you need done.

  • Lower starting price

    Not comparable

    Not comparable: Undetectable AI does not list a price

  • Free plan

    Tie

    Both have one

  • Higher rating

    QuillBot

    4.5 against 3.2

  • Same job?

    Yes

    Both are Writing tools

Side by side

Compared onQuillBotUndetectable AI
Our rating4.5Better3.2
Starts at$10/moFree
Free planYesYes
CategoryWritingWriting
Plans
  • FreeFree
  • Premium$10/mo
Free
Key features
  • Multi-mode sentence and paragraph paraphrasing
  • Grammar and clarity checking
  • Text summarizer for long source material
  • Citation generator (APA, MLA, and others)
  • Plagiarism checker on paid tiers
  • AI text detection with flagged sections
  • Image, audio and video AI detection
  • Fake PDF detector
  • AI humanizer that rewrites to evade detection
  • Paraphrasing, plagiarism checking and Chrome extension
Pros
  • Paraphrasing engine is genuinely strong and the tool's original focus
  • Free tier covers real, ongoing use, not just a trial
  • Citation and plagiarism tools fit academic workflows well
  • Detection across image, audio and video, not just text
  • Fake PDF detection targets a real and growing fraud problem
  • Free tier available before any payment
Cons
  • Heavy student association raises academic-integrity questions
  • Free tier word limits push serious use to Premium
  • Broader feature set feels secondary to the core paraphraser
  • Ships a humanizer for evading detection, with students among named users
  • Submitting rewritten work is academic misconduct at most institutions
  • No pricing figures published on the landing page
CompanyLearneo, Inc., founded 2017Undetectable Inc.

Prices come from each vendor's pricing page, last checked 20260814. Check the vendor before you buy.

FAQ

Questions people ask

Is QuillBot better than Undetectable AI?

In our reviews QuillBot scores 4.5 and Undetectable AI scores 3.2. The better pick depends on the job. QuillBot: Started as a paraphraser, grew into a full writing suite. Undetectable AI: Detects AI content across text, image, audio and video, and also rewrites text to evade detection.

Which is cheaper, QuillBot or Undetectable AI?

QuillBot: from $10/mo. Undetectable AI: free.

Do QuillBot and Undetectable AI have free plans?

Yes, both have a free plan.

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