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ZeroGPT alternatives: 7 apps ranked by verified data

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

Top picks

  • GPTZero logo

    Best overall

    GPTZero

    Free plan + paid

  • Originality.ai logo

    Best free option

    Originality.ai

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

Common reasons people leave ZeroGPT: scores are probabilistic and can flag human writing as AI, and free checks have a character limit per submission. We ranked 7 alternatives by how directly each one replaces ZeroGPT, then by reviews, real visits and how recently each app's facts were checked against its own website. GPTZero currently ranks first.

Quick comparison

#AppPricingVerified priceOpen sourcePlatformsVerified factsScore
1GPTZero logoGPTZeroFree plan + paid—NoWeb, Browser extension5 of 568.8
2Originality.ai logoOriginality.aiFree plan + paid$12.95/month billed annually (Pro); $14.95 monthlyNoWeb, Browser extension6 of 664.8
3Grammarly logoGrammarlyFree plan + paid$12 per member/month billed annually ($30 monthly), ProNoWeb, Windows, macOS +35 of 564.0
4Copyleaks logoCopyleaksFree plan + paid—NoWeb, Browser extension4 of 455.3
5QuillBot logoQuillBotFree plan + paid—NoWeb, Browser extension, iOS +10 of 053.4
6Sapling logoSaplingFree plan + paid$12/month, billed annually (Pro)NoWeb, Browser extension, Self-hosted5 of 547.5
7Scribbr logoScribbrFree plan + paid$19.95 per document (up to 7,499 words)NoWeb3 of 346.0
  1. GPTZero logo

    1. GPTZeroTop pick

    Best for: Teachers and schools that want an AI check built into Google Docs, Classroom and Canvas

    Free plan + paidWeb, Browser extension

    68.8

    score / 100

    Why switch from ZeroGPT

    Built for classrooms, with writing-process replay and LMS integrations that help when a score is disputed.

    Pros

    • Short texts can be checked without signing up
    • Writing Replay shows how a document was actually typed
    • Integrations with Google Docs, Classroom, Canvas and Zapier
    • Full support for five major European languages

    Cons

    • 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
    Visit GPTZero Compare with ZeroGPTDetails 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 GPTZero a good ZeroGPT alternative?

    Verified facts

    5 of 5 verified
    Founded
    January 2023
    Checked Nov 8, 2026gptzero.me(opens source in a new tab)
    Languages
    English, German, Portuguese, French, Spanish
    Checked Nov 8, 2026gptzero.me(opens source in a new tab)
    Free scans
    No account needed under 10,000 characters
    Checked Nov 8, 2026gptzero.me(opens source in a new tab)
    Browser extension
    Chrome
    Checked Nov 8, 2026gptzero.me(opens source in a new tab)
    API
    Yes
    Checked Nov 8, 2026gptzero.me(opens source in a new tab)
  2. Originality.ai logo

    2. Originality.ai

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

    Free plan + paidWeb, Browser extension

    64.8

    score / 100

    Why switch from ZeroGPT

    Aimed at publishers and SEO teams, with site scans, fact checking and team accounts on pay-as-you-go credits.

    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 Details and reviews
    How this score is calculated
    Editorial fit ×0.387
    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 ZeroGPT 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)
  3. Grammarly logo

    3. 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

    64.0

    score / 100

    Why switch from ZeroGPT

    Its free AI detector sits next to grammar and plagiarism checks, handy if you already use Grammarly.

    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 ×0.334
    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 ZeroGPT 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)
  4. Copyleaks logo

    4. Copyleaks

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

    Free plan + paidWeb, Browser extension

    55.3

    score / 100

    Why switch from ZeroGPT

    Pairs AI-content detection with plagiarism checking, with an API and LMS integrations for schools.

    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 Details and reviews
    How this score is calculated
    Editorial fit ×0.363
    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 ZeroGPT 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)
  5. QuillBot logo

    5. QuillBot

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

    Free plan + paidWeb, Browser extension, iOS, Android

    53.4

    score / 100

    Why switch from ZeroGPT

    Its free AI detector sits next to a paraphraser and grammar checker you may already use for writing.

    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 ×0.341
    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 ZeroGPT alternative?

    Verified facts

    0 of 0 verified

    No sourced facts yet.

  6. Sapling logo

    6. Sapling

    Best for: Support and sales teams, and developers who want grammar checks inside their own product

    Free plan + paidSelf-hostableWeb, Browser extension, Self-hosted

    47.5

    score / 100

    Why switch from ZeroGPT

    Free AI detector that highlights the sentences most likely to be machine-written, with an API for developers.

    Pros

    • API for grammar, autocomplete and AI detection
    • Self-hosted deployment on the enterprise tier
    • Snippets and autocomplete for repetitive replies

    Cons

    • Self-hosting needs an enterprise contract
    • Less known for long-form or creative writing
    • Enterprise tier has a 10-seat minimum
    Visit Sapling Details and reviews
    How this score is calculated
    Editorial fit ×0.329
    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 Sapling a good ZeroGPT alternative?

    Verified facts

    5 of 5 verified
    Free plan
    Yes, up to 2,000 characters per check
    Checked Nov 8, 2026sapling.ai(opens source in a new tab)
    Starting price
    $12/month, billed annually (Pro)
    Checked Nov 8, 2026sapling.ai(opens source in a new tab)
    Free trial
    1 month of Pro
    Checked Nov 8, 2026sapling.ai(opens source in a new tab)
    Enterprise price
    From $15/seat/month, 10 seats minimum
    Checked Nov 8, 2026sapling.ai(opens source in a new tab)
    API
    Yes, usage-based
    Checked Nov 8, 2026sapling.ai(opens source in a new tab)
  7. Scribbr logo

    7. Scribbr

    Best for: Students checking a thesis or essay for plagiarism, citations and errors before submission

    Free plan + paidWeb

    46.0

    score / 100

    Why switch from ZeroGPT

    Free AI detector from an academic-writing service, alongside plagiarism and citation tools for students.

    Pros

    • Pay once per document; no subscription needed
    • Plagiarism report includes self-plagiarism checks
    • Free citation generator for many academic styles
    • Human proofreading available for important papers

    Cons

    • Premium plagiarism checks cost more per paper than some subscriptions
    • Web only, with no desktop or mobile app
    • Focused on academic writing; little help for business copy
    Visit Scribbr Details and reviews
    How this score is calculated
    Editorial fit ×0.332
    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 Scribbr a good ZeroGPT alternative?

    Verified facts

    3 of 3 verified
    Premium check price
    $19.95 per document (up to 7,499 words)
    Checked Nov 8, 2026scribbr.com(opens source in a new tab)
    Billing
    Per check, no subscription
    Checked Nov 8, 2026scribbr.com(opens source in a new tab)
    Self-plagiarism check
    Yes
    Checked Nov 8, 2026scribbr.com(opens source in a new tab)

The best ZeroGPT alternative for…

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

GPTZero logo

Best ZeroGPT alternative for most people

GPTZero

Built for classrooms, with writing-process replay and LMS integrations that help when a score is disputed.

Originality.ai logo

Best ZeroGPT alternative for a free plan you can upgrade

Originality.ai

Aimed at publishers and SEO teams, with site scans, fact checking and team accounts on pay-as-you-go credits.

Sapling logo

Best ZeroGPT alternative for self-hosting

Sapling

Free AI detector that highlights the sentences most likely to be machine-written, with an API for developers.

Grammarly logo

Best ZeroGPT alternative for Mac

Grammarly

Its free AI detector sits next to grammar and plagiarism checks, handy if you already use Grammarly.

Grammarly logo

Best ZeroGPT alternative for Windows

Grammarly

Its free AI detector sits next to grammar and plagiarism checks, handy if you already use Grammarly.

QuillBot logo

Best ZeroGPT alternative for iPhone and Android

QuillBot

Its free AI detector sits next to a paraphraser and grammar checker you may already use for writing.

Copyleaks logo

Best ZeroGPT alternative for working in the browser

Copyleaks

Pairs AI-content detection with plagiarism checking, with an API and LMS integrations for schools.

ZeroGPT alternatives: common questions

What is the best alternative to ZeroGPT?

GPTZero ranks first right now. Built for classrooms, with writing-process replay and LMS integrations that help when a score is disputed. Originality.ai and Grammarly follow it in our ranking.

ZeroGPT vs GPTZero: what's the difference?

Both ZeroGPT and GPTZero are free with paid plans. Only GPTZero runs on Browser extension.

Is ZeroGPT free?

ZeroGPT is free with paid plans. Free plan: $0 forever. Checked on ZeroGPT's own site, November 2026.

How much do ZeroGPT alternatives cost?

Verified prices for the top-ranked ZeroGPT alternatives: Originality.ai, $12.95/month billed annually (Pro); $14.95 monthly; Grammarly, $12 per member/month billed annually ($30 monthly), Pro; Sapling, $12/month, billed annually (Pro); Scribbr, $19.95 per document (up to 7,499 words). 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 ZeroGPT?

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

Is there an open-source alternative to ZeroGPT?

None of the 7 alternatives in this list is open source.

Why do people switch from ZeroGPT?

The complaints we hear most: 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.

How is this list ranked?

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