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Alternatives · Writing

GPTZero alternatives

As of Nov 13, 2026, the best GPTZero alternative for most people is Grammarly (3.0 GPA), second in our ranking of writing tools. It's also the best free one.

GPTZero compared with 6 alternatives: Originality.ai, Winston AI, Pangram, Grammarly, Undetectable AI and 1 more.

GPTZero's current pricing could not be confirmed from its own site. 4 of the 6 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 GPTZero sale?

At a glance

ToolPriceFree planRuns on
GPTZeroThis toolFree planYesWeb, Browser extension
Originality.aiFree plan · from $12.95/moYesWeb, Browser extension
Winston AIFree trial · from $10/moTrial onlyWeb, Browser extension
PangramFree plan · from $15/moYesWeb, Browser extension
GrammarlyFree plan · from $12/moYesWeb, macOS, Windows, iOS, Android, Browser extension
Undetectable AIFree trial · from $5/moTrial onlyWeb, Browser extension
WriteHumanFree plan · from $12/moYesWeb, Browser extension

How each one differs from GPTZero

  1. Originality.ai

    AI-content and plagiarism checker with a Chrome extension and API

    • Originality.ai starts at $12.95 per month, billed annually ($14.95 billed monthly).
    • Originality.ai also covers reports.

    Suits: Publishers and agencies that screen freelancer content for AI use

    Originality.ai vs GPTZeroOriginality.ai pricing and details

  2. 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 has no free plan, only a free trial, unlike GPTZero.

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

    Winston AI vs GPTZeroWinston AI pricing and details

  3. Pangram

    Detects AI-written text and images, with a free daily allowance

    • Pangram starts at $15 per month, billed annually ($20 billed monthly).
    • Pangram does not cover grammar & style, which GPTZero does.

    Suits: Teachers and professors checking student work for AI writing

    Pangram vs GPTZeroPangram pricing and details

  4. Grammarly

    Writing assistant for grammar, tone and rewrites in any app

    • Grammarly starts at $12 per member / month, billed annually.
    • Grammarly also lists macOS, Windows, iOS and Android apps.
    • Grammarly also covers AI agents, citations and documents.

    Suits: People who write across many apps and want the same checks in each

    Grammarly vs GPTZeroGrammarly pricing and details

  5. Undetectable AI

    AI humanizer and AI detector sold by monthly word allowance

    • Undetectable AI starts at $5 per month for 10K words, billed annually ($9.99 billed monthly).
    • Undetectable AI has no free plan, only a free trial, unlike GPTZero.
    • Undetectable AI also covers documents.
    • Undetectable AI does not cover grammar & style, which GPTZero does.

    Suits: People who want to run text through both a rewriter and a detector

    Undetectable AI vs GPTZeroUndetectable AI pricing and details

  6. WriteHuman

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

    • WriteHuman starts at $12 per month, billed annually ($20 billed monthly).
    • WriteHuman does not cover grammar & style, which GPTZero does.

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

    WriteHuman vs GPTZeroWriteHuman pricing and details

Limits worth knowing in GPTZero

  • Paid individual plan prices vary by region and by test; no single US dollar list price could be read.
  • The free plan stops at 10,000 words a month.
  • The team plan has a two-seat minimum and gives 500,000 words per member each month.
  • The API is priced separately from the individual and team plans.
GPTZero pricing and details

Common questions

What are the alternatives to GPTZero?

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

Is there a free alternative to GPTZero?

Yes. Originality.ai, Pangram, Grammarly and WriteHuman have a free plan alongside paid ones.

Which GPTZero alternatives work on Windows?

The GPTZero listing does not include a Windows app. Grammarly lists one.

Which GPTZero alternatives work on macOS?

The GPTZero listing does not include a macOS app. Grammarly 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.