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Undetectable AI alternatives: 3 apps ranked by verified data

Facts checked Oct 29, 2026AppBreakup editorialHow we rank

Common reasons people leave Undetectable AI: free trial is limited to 250 words, and word allowances on cheaper plans run out quickly. We ranked 3 alternatives by how directly each one replaces Undetectable AI, then by reviews, real visits and how recently each app's facts were checked against its own website. Grammarly currently ranks first.

Quick comparison

#AppPricingOpen sourcePlatformsVerified factsScore
1Grammarly logoGrammarlyFree plan + paidNoWeb, Windows, macOS +34 of 476.8
2QuillBot logoQuillBotFree plan + paidNoWeb, Browser extension, iOS +10 of 071.0
3Wordtune logoWordtuneFree plan + paidNoWeb, iOS, Browser extension4 of 464.8
  1. Grammarly logo

    1. GrammarlyTop pick

    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

    76.8

    score / 100

    Why switch from Undetectable AI

    Full writing assistant with grammar, tone and rewrite suggestions, plus an AI detector for checking drafts.

    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 ×0.377
    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 Undetectable AI alternative?

    Verified facts

    4 of 4 verified
    Free plan
    Yes, $0/month
    Checked Oct 25, 2026grammarly.com(opens source in a new tab)
    Starting price
    $12 per member/month, billed annually (Pro)
    Checked Oct 25, 2026grammarly.com(opens source in a new tab)
    Free AI prompts
    100 per month
    Checked Oct 29, 2026grammarly.com(opens source in a new tab)
    Users
    Over 40 million people
    Checked Oct 25, 2026grammarly.com(opens source in a new tab)
  2. QuillBot logo

    2. QuillBot

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

    Free plan + paidWeb, Browser extension, iOS, Android

    71.0

    score / 100

    Why switch from Undetectable AI

    Paraphraser with a free tier, plus grammar checking and its own AI detector, at a broad student-friendly price.

    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 ×0.3100
    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 Undetectable AI alternative?

    Verified facts

    0 of 0 verified

    No sourced facts yet.

  3. Wordtune logo

    3. Wordtune

    Best for: People who know what they want to say and need help phrasing it, mostly in email and docs

    Free plan + paidWeb, iOS, Browser extension

    64.8

    score / 100

    Why switch from Undetectable AI

    Rewrites sentences in different tones to sound natural, aimed at improving writing rather than beating detectors.

    Pros

    • Natural-sounding sentence alternatives with tone controls
    • Works inside Gmail and Google Docs via the extension
    • Paid plans are cheaper than most rivals

    Cons

    • Free plan allows only a handful of rewrites a day
    • No refunds on paid plans
    • English-focused, with no desktop app
    Visit Wordtune 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 Wordtune a good Undetectable AI alternative?

    Verified facts

    4 of 4 verified
    Free plan
    Yes, 10 rewrites per day
    Checked Oct 29, 2026wordtune.com(opens source in a new tab)
    Starting price
    $4.89/month, billed annually (Advanced)
    Checked Oct 29, 2026wordtune.com(opens source in a new tab)
    Unlimited plan
    $6.99/month, billed annually
    Checked Oct 29, 2026wordtune.com(opens source in a new tab)
    Free trial
    3 days
    Checked Oct 29, 2026wordtune.com(opens source in a new tab)

The best Undetectable AI alternative for…

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

Grammarly logo

Best Undetectable AI alternative for most people

Grammarly

Full writing assistant with grammar, tone and rewrite suggestions, plus an AI detector for checking drafts.

QuillBot logo

Best Undetectable AI alternative for a free plan you can upgrade

QuillBot

Paraphraser with a free tier, plus grammar checking and its own AI detector, at a broad student-friendly price.

Grammarly logo

Best Undetectable AI alternative for Mac

Grammarly

Full writing assistant with grammar, tone and rewrite suggestions, plus an AI detector for checking drafts.

Grammarly logo

Best Undetectable AI alternative for Windows

Grammarly

Full writing assistant with grammar, tone and rewrite suggestions, plus an AI detector for checking drafts.

Grammarly logo

Best Undetectable AI alternative for iPhone and Android

Grammarly

Full writing assistant with grammar, tone and rewrite suggestions, plus an AI detector for checking drafts.

Wordtune logo

Best Undetectable AI alternative for working in the browser

Wordtune

Rewrites sentences in different tones to sound natural, aimed at improving writing rather than beating detectors.

Undetectable AI alternatives: common questions

What is the best alternative to Undetectable AI?

Grammarly ranks first right now. Full writing assistant with grammar, tone and rewrite suggestions, plus an AI detector for checking drafts. QuillBot and Wordtune follow it in our ranking.

Is there a free alternative to Undetectable AI?

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

Is there an open-source alternative to Undetectable AI?

None of the 3 alternatives in this list is open source.

Why do people switch from Undetectable AI?

The complaints we hear most: free trial is limited to 250 words; word allowances on cheaper plans run out quickly; bypassing AI detection may break school or employer rules.

How is this list ranked?

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