Software Alternatives, Accelerators & Startups

Top 12 Open-Source Alternatives to GPTZero

GPTZero
Undetectable.ai JustDone Polygraf.ai AIScanner.io GPT4Detector.ai VibeAxis Slop Index Dechecker AI-Humanizer.com Ink Grammar Checker By EssayOnTime

Summary

The top open-source alternatives to GPTZero are Undetectable.ai, JustDone, and Polygraf.ai. One of the criteria for ordering this list is the number of mentions that products have on reliable external sources. You can suggest additional sources through the form here.
  1. The most powerful and advanced AI humanizer tool, built to bypass AI algorithms and ensure that your writing remains undetectable to AI detectors.
    Pricing:
    • Open Source

    #AI #Writing Tools #AI Writing 11 social mentions

  2. Write smarter with Justdoneโ€”an AI-powered platform that transforms, checks, and polishes your content so it reads naturally and passes AI or plagiarism checks.
    Pricing:
    • Open Source
    • Freemium
    • Free Trial
    • $19.99 / Monthly

    #Plagiarism Detection #Plagiarism #Plagiarism Checker

  3. Polygrafโ€ฏAI is a free, completely private AI Content detector that flags text from ChatGPT, Gemini, Mistral, Llama, Grammarly and more and traces sources and copyright risk in one click.
    Pricing:
    • Open Source
    • Freemium
    • Free Trial

    #Marketing #Plagiarism Checker #Content Creation 2 user reviews

  4. Catch AI-generated text with AI Scanner, your accurate free AI detector. Get a content report, AI score, and sentence-by-sentence breakdown.
    Pricing:
    • Open Source

    #AI #Writing Tools #AI Detection

  5. GPT4 Detector has been trained to detect the new ChatGPT AI text, as well as any other AI text generator, and let you know if what you're reading is human written or AI written, completely FREE.
    Pricing:
    • Open Source
    • Free
    • Free Trial

    #AI #AI Writing #Text Detection

  6. Paste text or fetch a URL. Get a transparent โ€œslopโ€ score (0โ€“100) with readable signalsโ€”repetition, clichรฉs, hedges, buzzwords, passive voice, uniformity, and more.
    Pricing:
    • Open Source
    • Free

    #Content Marketing #SEO Tools #AI 1 social mentions

  7. Dechecker's AI Checker and Detector tool checks whether text is generated by AI models, such as ChatGPT, GPT-5, Claude, Gemini, LLaMa, etc.
    Pricing:
    • Open Source
    • Free
    • Free Trial

    #AI #Writing Tools #AI Detection

  8. AI Humanizer - This technology allows you to transform your AI-generated text into human-like text at the press of a button. Enhance the readability of your text and make it more authentic. Bypass AI Detection, and achieve a 100% human-like score.
    Pricing:
    • Open Source
    • Paid
    • Free Trial
    • $9.99 / Monthly (12000 words)

    #AI #Writing Tools #AI Writing

  9. 9

    Ink

    Rock solid freelance contracts in minutes
    Pricing:
    • Open Source

    #AI #Writing Tools #AI Writing

  10. If you are worried about mistakes or bored with proofreading, run our grammar check to correct any punctuation or spelling errors in your writing.
    Pricing:
    • Open Source
    • Free
    • Free Trial

    #Education #Writing Tools #Grammar Checker

  11. Bypass AI is the best AI humanizer to convert AI to human text. Humanize AI content with the best ChatGPT bypasser today.
    Pricing:
    • Open Source
    • Freemium
    • Free Trial
    • $6.99 / Monthly ($29.99)

    #AI #Writing Tools #AI Writing

  12. FREE Grammar Checker. Simply paste your writing & all spelling, punctuation, and grammar mistakes will be identified. Embarrassing grammar mistakes are a thing of the past!
    Pricing:
    • Open Source
    • Free
    • Free Trial

    #Writing Tools #Grammar Checker #Spell Checker

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GPTZero discussion

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  1. User avatar
    Reza Achmad
    ยท 10 months ago
    ยท Reply

    GPTZero is great for educators and writers like me because it can accurately check if a text was written by an AI like ChatGPT.

  2. User avatar
    jsonchao
    ยท 10 months ago
    ยท Reply

    An atmosphere of mystery and horror.