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GPTZero alternatives: 6 apps ranked by verified data

Facts checked Nov 8, 2026AppBreakup editorialHow we rankAll AI content detectors

Top picks

  • Originality.ai logo

    Best overall

    Originality.ai

    Starting price: $12.95/month billed annually (Pro); $14.95 monthly

  • Grammarly logo

    Best free option

    Grammarly

    Starting price: $12 per member/month billed annually ($30 monthly), Pro

Common reasons people leave GPTZero: detection scores are estimates and can mislabel human writing, and longer scans and extra tools sit behind an account or paid plan. We ranked 6 alternatives by how directly each one replaces GPTZero, then by reviews, real visits and how recently each app's facts were checked against its own website. Originality.ai currently ranks first.

Quick comparison

#AppPricingVerified priceOpen sourcePlatformsVerified factsScore
1Originality.ai logoOriginality.aiFree plan + paid$12.95/month billed annually (Pro); $14.95 monthlyNoWeb, Browser extension6 of 668.8
2Grammarly logoGrammarlyFree plan + paid$12 per member/month billed annually ($30 monthly), ProNoWeb, Windows, macOS +35 of 566.2
3ZeroGPT logoZeroGPTFree plan + paid—NoWeb5 of 557.5
4QuillBot logoQuillBotFree plan + paid—NoWeb, Browser extension, iOS +10 of 054.8
5Pangram logoPangramFree plan + paid$20/month after 7-day trialNoWeb, Browser extension5 of 542.3
6Copyleaks logoCopyleaksFree plan + paid—NoWeb, Browser extension4 of 440.0
  1. Originality.ai logo

    1. Originality.aiTop pick

    Best for: Publishers and SEO agencies checking freelance content for AI writing and plagiarism

    Free plan + paidWeb, Browser extension

    68.8

    score / 100

    Why switch from GPTZero

    Built for publishers and SEO teams, with plagiarism, readability and fact-checking in one credit-based plan.

    Pros

    • AI detection, plagiarism, readability and fact checks in one scan
    • Credit system makes cost per word easy to predict
    • Extensions for Chrome, Firefox and Google Docs

    Cons

    • Free allowance is a one-time batch rather than a monthly refill
    • API access is limited to the expensive Enterprise plan
    • Like all detectors, results are probabilities that can be wrong
    Visit Originality.ai Compare with GPTZeroDetails and reviews
    How this score is calculated
    Editorial fit ×0.3100
    Reviews ×0.363
    Clicks (90 days) ×0.150
    Freshness ×0.15100
    Votes ×0.150

    0 counted reviews, 0 up and 0 down votes. Full formula

    Is Originality.ai a good GPTZero alternative?

    Verified facts

    6 of 6 verified
    Free plan
    Yes, 10K words one time
    Checked Nov 8, 2026originality.ai(opens source in a new tab)
    Starting price
    $12.95/month billed annually (Pro); $14.95 monthly
    Checked Nov 8, 2026originality.ai(opens source in a new tab)
    Pro allowance
    200K words per month
    Checked Nov 8, 2026originality.ai(opens source in a new tab)
    API
    Enterprise plan
    Checked Nov 8, 2026originality.ai(opens source in a new tab)
    Browser extensions
    Chrome, Firefox, Google Docs
    Checked Nov 8, 2026originality.ai(opens source in a new tab)
    Enterprise plan
    $136.58/month billed annually; $179 monthly
    Checked Nov 8, 2026originality.ai(opens source in a new tab)
  2. Grammarly logo

    2. Grammarly

    Best for: English writers who want corrections and AI help everywhere they type, without changing apps

    Free plan + paidWeb, Windows, macOS, iOS, Android, Browser extension

    66.2

    score / 100

    Why switch from GPTZero

    Includes a free AI detector next to its grammar checker, plus authorship tracking that helps writers show their work is their own.

    Pros

    • Works across browsers, desktop apps and phone keyboards
    • Free plan is genuinely useful for spelling and grammar
    • Team style guides and brand tones on business plans

    Cons

    • Text is processed in the cloud, which rules it out for some work
    • Best features need Pro, and monthly billing is expensive
    • Mostly English; weak for other languages
    Visit Grammarly Details and reviews
    How this score is calculated
    Editorial fit ×0.341
    Reviews ×0.363
    Clicks (90 days) ×0.15100
    Freshness ×0.15100
    Votes ×0.150

    0 counted reviews, 0 up and 0 down votes. Full formula

    Is Grammarly a good GPTZero alternative?

    Verified facts

    5 of 5 verified
    Free plan
    Yes, $0 a month with 100 AI prompts
    Checked Nov 8, 2026grammarly.com(opens source in a new tab)
    Starting price
    $12 per member/month billed annually ($30 monthly), Pro
    Checked Nov 8, 2026grammarly.com(opens source in a new tab)
    Free AI prompts
    100 per month
    Checked Nov 8, 2026grammarly.com(opens source in a new tab)
    Users
    Over 40 million people
    Checked Nov 8, 2026grammarly.com(opens source in a new tab)
    Free trial
    Yes, on Pro
    Checked Nov 8, 2026grammarly.com(opens source in a new tab)
  3. ZeroGPT logo

    3. ZeroGPT

    Best for: Students, teachers and editors who want a quick free AI-text check without signing up

    Free plan + paidWeb

    57.5

    score / 100

    Why switch from GPTZero

    Free AI text detector you can use without an account for quick checks of essays and articles.

    Pros

    • Basic detector works free and without an account
    • Highlights the specific sentences it flags as AI-written
    • Pay-as-you-go API for teams that want to automate checks
    • Also usable through WhatsApp and Telegram bots

    Cons

    • Scores are probabilistic and can flag human writing as AI
    • Free checks have a character limit per submission
    • Offering a humanizer next to a detector muddies its purpose for educators
    Visit ZeroGPT Compare with GPTZeroDetails and reviews
    How this score is calculated
    Editorial fit ×0.363
    Reviews ×0.363
    Clicks (90 days) ×0.150
    Freshness ×0.15100
    Votes ×0.150

    0 counted reviews, 0 up and 0 down votes. Full formula

    Is ZeroGPT a good GPTZero alternative?

    Verified facts

    5 of 5 verified
    Free plan
    $0 forever
    Checked Nov 8, 2026zerogpt.com(opens source in a new tab)
    API
    Pay-as-you-go business API
    Checked Nov 8, 2026zerogpt.com(opens source in a new tab)
    Free check limit
    15,000 characters
    Checked Nov 8, 2026zerogpt.com(opens source in a new tab)
    Messaging apps
    WhatsApp and Telegram
    Checked Nov 8, 2026zerogpt.com(opens source in a new tab)
    Claimed accuracy
    98.4% (vendor figure)
    Checked Nov 8, 2026zerogpt.com(opens source in a new tab)
  4. QuillBot logo

    4. QuillBot

    Best for: Students and non-native writers who mainly want to rephrase and summarise text

    Free plan + paidWeb, Browser extension, iOS, Android

    54.8

    score / 100

    Why switch from GPTZero

    Offers a free AI detector inside a broader paraphrasing and grammar toolkit, handy for quick checks.

    Pros

    • Many paraphrasing modes with adjustable strength
    • Summariser, citations and grammar checks in one place
    • Usable free tier for occasional rewording

    Cons

    • Free plan limits text length and modes
    • Heavy paraphrasing can make writing sound generic
    • Grammar checking is less thorough than dedicated checkers
    Visit QuillBot Details and reviews
    How this score is calculated
    Editorial fit ×0.346
    Reviews ×0.363
    Clicks (90 days) ×0.15100
    Freshness ×0.1515
    Votes ×0.150

    0 counted reviews, 0 up and 0 down votes. Full formula

    Is QuillBot a good GPTZero alternative?

    Verified facts

    0 of 0 verified

    No sourced facts yet.

  5. Pangram logo

    5. Pangram

    Best for: Educators and editors who want a low false-positive AI detector with plagiarism checks built in

    Free plan + paidWeb, Browser extension

    42.3

    score / 100

    Why switch from GPTZero

    Research-backed detector with a very low false-positive rate and segment-level AI highlighting.

    Pros

    • Shows which segments look AI-generated or AI-edited, not just one score
    • Plagiarism similarity check included with scans
    • Detects text in 20+ languages and handles bulk file uploads
    • Pay-as-you-go API and an MCP server for developers

    Cons

    • Free use is limited to a small daily credit allowance
    • Results are probabilistic and shouldn't be used as sole evidence
    • No offline or self-hosted option for sensitive documents
    Visit Pangram Details and reviews
    How this score is calculated
    Editorial fit ×0.312
    Reviews ×0.363
    Clicks (90 days) ×0.150
    Freshness ×0.15100
    Votes ×0.150

    0 counted reviews, 0 up and 0 down votes. Full formula

    Is Pangram a good GPTZero alternative?

    Verified facts

    5 of 5 verified
    Individual plan
    $20/month after 7-day trial
    Checked Nov 8, 2026pangram.com(opens source in a new tab)
    Free use
    20 credits per day
    Checked Nov 5, 2026pangram.com(opens source in a new tab)
    Languages
    20+
    Checked Nov 8, 2026pangram.com(opens source in a new tab)
    Founded
    2023, Brooklyn
    Checked Nov 8, 2026pangram.com(opens source in a new tab)
    API price (text)
    $0.05 per 100 words
    Checked Nov 8, 2026pangram.com(opens source in a new tab)
  6. Copyleaks logo

    6. Copyleaks

    Best for: Schools, publishers and developers who need AI detection and plagiarism checks in one service or API

    Free plan + paidWeb, Browser extension

    40.0

    score / 100

    Why switch from GPTZero

    Adds plagiarism, code and image checks to AI detection, plus a developer API.

    Pros

    • Combines plagiarism and AI detection in a single scan
    • Covers source code, images and video, not just prose
    • Well-documented API with SDKs for six languages
    • Can compare against private document databases

    Cons

    • Credit-based pricing can add up for long documents
    • Like all AI detectors, results are probabilistic and can misfire
    • Main website blocks automated access, so checks happen through the app or API
    Visit Copyleaks Compare with GPTZeroDetails and reviews
    How this score is calculated
    Editorial fit ×0.312
    Reviews ×0.363
    Clicks (90 days) ×0.150
    Freshness ×0.1585
    Votes ×0.150

    0 counted reviews, 0 up and 0 down votes. Full formula

    Is Copyleaks a good GPTZero alternative?

    Verified facts

    4 of 4 verified
    API SDKs
    Python, JavaScript, Java, C#, PHP, Ruby
    Checked Nov 8, 2026docs.copyleaks.com(opens source in a new tab)
    AI image detection
    Yes
    Checked Nov 8, 2026docs.copyleaks.com(opens source in a new tab)
    Code plagiarism
    Yes
    Checked Nov 8, 2026docs.copyleaks.com(opens source in a new tab)
    Citation checker
    Yes
    Checked Nov 8, 2026docs.copyleaks.com(opens source in a new tab)

The best GPTZero alternative for…

The highest-ranked app in this list for each need.

Originality.ai logo

Best GPTZero alternative for most people

Originality.ai

Built for publishers and SEO teams, with plagiarism, readability and fact-checking in one credit-based plan.

Grammarly logo

Best GPTZero alternative for a free plan you can upgrade

Grammarly

Includes a free AI detector next to its grammar checker, plus authorship tracking that helps writers show their work is their own.

Grammarly logo

Best GPTZero alternative for Mac

Grammarly

Includes a free AI detector next to its grammar checker, plus authorship tracking that helps writers show their work is their own.

Grammarly logo

Best GPTZero alternative for Windows

Grammarly

Includes a free AI detector next to its grammar checker, plus authorship tracking that helps writers show their work is their own.

QuillBot logo

Best GPTZero alternative for iPhone and Android

QuillBot

Offers a free AI detector inside a broader paraphrasing and grammar toolkit, handy for quick checks.

ZeroGPT logo

Best GPTZero alternative for working in the browser

ZeroGPT

Free AI text detector you can use without an account for quick checks of essays and articles.

GPTZero alternatives: common questions

What is the best alternative to GPTZero?

Originality.ai ranks first right now. Built for publishers and SEO teams, with plagiarism, readability and fact-checking in one credit-based plan. Grammarly and ZeroGPT follow it in our ranking.

GPTZero vs Originality.ai: what's the difference?

Both GPTZero and Originality.ai are free with paid plans. Both run on Web and Browser extension.

Is GPTZero free?

GPTZero is free with paid plans.

How much do GPTZero alternatives cost?

Verified prices for the top-ranked GPTZero alternatives: Originality.ai, $12.95/month billed annually (Pro); $14.95 monthly; Grammarly, $12 per member/month billed annually ($30 monthly), Pro; Pangram, $20/month after 7-day trial. Each price was checked on the app's own site; see each card below for the date and source.

Is there a free alternative to GPTZero?

Yes. Originality.ai (free plan + paid), Grammarly (free plan + paid), ZeroGPT (free plan + paid) and QuillBot (free plan + paid) have a free option. Check each app's verified facts for current plan limits.

Is there an open-source alternative to GPTZero?

None of the 6 alternatives in this list is open source.

Why do people switch from GPTZero?

The complaints we hear most: detection scores are estimates and can mislabel human writing; longer scans and extra tools sit behind an account or paid plan; plan prices on the pricing page only load with JavaScript.

How is this list ranked?

Every app is scored with the same published formula: how directly it replaces GPTZero, reviews (weighted by verification), visits from AppBreakup, how recently its facts were checked against its own website, and reader votes.