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Alternatives · Writing

Undetectable AI alternatives

As of Nov 13, 2026, the highest-graded Undetectable AI alternative is QuillBot (2.8 GPA). It's also the best free one.

Undetectable AI compared with 5 alternatives: WriteHuman, QuillBot, GPTZero, Winston AI and WordAi.

Undetectable AI is a paid product with a free trial, starting at $5 per month for 10K words, billed annually ($9.99 billed monthly). 3 of the 5 alternatives are free or have a free plan. 2 more offer a free trial.

Listings checked up to Nov 13, 2026 · Where the facts come from

Black Friday: is there a Undetectable AI sale?

At a glance

ToolPriceFree planRuns on
Undetectable AIThis toolFree trial · from $5/moTrial onlyWeb, Browser extension
WriteHumanFree plan · from $12/moYesWeb, Browser extension
QuillBotFree plan · from $8.33/moYesWeb, macOS, Windows, iOS, Android, Browser extension
GPTZeroFree planYesWeb, Browser extension
Winston AIFree trial · from $10/moTrial onlyWeb, Browser extension
WordAiFree trial · from $9/moTrial onlyWeb

Price against what you get

Undetectable AI starts at $5 a month and scores 2.3 out of 4 on features, ease of use and platforms. None of the 4 alternatives on this chart both scores higher and starts lower.

QuillBot and Winston AI score higher without starting lower.

Features, ease of use and platforms, averaged

D1.0C2.0B3.0A4.0Free$0.5$1$2$5$10$20$50$100More for lessCosts more, scores moreCosts less, scores lessCosts more, scores lessUndetectable AIWriteHumanQuillBotWinston AIWordAi

What paid plans start at, a month (each step along is roughly double) →

  • The best score at each price
  • Has a free plan
  • No free plan
The full chart of writing tools, and the best at every price

How each one differs from Undetectable AI

  1. WriteHuman

    AI humanizer with a built-in AI text and image detector

    • WriteHuman starts at $12 per month, billed annually ($20 billed monthly).
    • WriteHuman has a free plan, which Undetectable AI lacks.
    • WriteHuman does not cover documents, which Undetectable AI does.

    Suits: Writers who edit AI drafts and want a rewrite plus a detector in one account

    WriteHuman vs Undetectable AIWriteHuman pricing and details

  2. QuillBot

    AI paraphraser with grammar, summarizing and AI-detection tools

    • QuillBot starts at $8.33 per month, billed annually (Premium).
    • QuillBot has a free plan, which Undetectable AI lacks.
    • QuillBot also lists macOS, Windows, iOS and Android apps.
    • QuillBot also covers chat assistant, citations and grammar & style.
    • QuillBot does not cover documents, which Undetectable AI does.

    Suits: Students and writers who need to reword or shorten existing text

    QuillBot vs Undetectable AIQuillBot pricing and details

  3. GPTZero

    AI-writing detector with plagiarism, writing replay and an API

    • GPTZero has a free plan, which Undetectable AI lacks.
    • GPTZero also covers grammar & style.
    • GPTZero does not cover documents, which Undetectable AI does.

    Suits: Teachers checking student work for AI use

    GPTZero vs Undetectable AIGPTZero pricing and details

  4. Winston AI

    AI text and image detector with a plagiarism checker

    • Winston AI starts at $10 per month, billed annually ($18 billed monthly).
    • Winston AI also covers grammar & style.
    • Winston AI does not cover documents, which Undetectable AI does.

    Suits: Teachers and editors who need to review submitted writing for AI use

    Winston AI vs Undetectable AIWinston AI pricing and details

  5. WordAi

    Article rewriter for bulk content with an API

    • WordAi starts at $9 per month, billed annually ($17 billed monthly).
    • WordAi lists no browser extension, which Undetectable AI has.
    • WordAi also covers long-form writing.
    • WordAi does not cover documents, which Undetectable AI does.

    Suits: Content teams and SEO agencies rewriting many articles in bulk

    WordAi vs Undetectable AIWordAi pricing and details

Limits worth knowing in Undetectable AI

  • The free trial is capped at 250 words.
  • Plans are measured in words per month, so heavy users move to the larger tiers quickly.
  • The $5 figure is the yearly-billing rate with a crossed-out $9.99; month-to-month the first plan is $9.99.
  • Non-expiring credits and white labeling are offered only on the custom business plan.
Undetectable AI pricing and details

Common questions

What are the alternatives to Undetectable AI?

The alternatives to Undetectable AI in this directory are WriteHuman, QuillBot, GPTZero, Winston AI and WordAi. Each one has a side-by-side comparison with Undetectable AI.

Is there a free alternative to Undetectable AI?

Yes. WriteHuman, QuillBot and GPTZero have a free plan alongside paid ones.

Which Undetectable AI alternatives work on Windows?

The Undetectable AI listing does not include a Windows app. QuillBot lists one.

Which Undetectable AI alternatives work on macOS?

The Undetectable AI listing does not include a macOS app. QuillBot lists one.

When were these prices checked?

Each listing shows its own date. On this page they run from Oct 5, 2026 to Nov 13, 2026. Vendors change prices without notice, so confirm on their site before you buy.