# Leap AI > Leap AI is an AI content detector and AI humanizer. Detects text generated by ChatGPT, Claude, Gemini, Llama, Mistral, and other large language models. Humanizes AI-written text to read naturally and pass detectors like GPTZero, Turnitin, Originality.ai, and Copyleaks. Detection is free and unlimited with no signup. Humanization is free for the first 500 words; paid plans unlock higher monthly word allowances and API access. ## Core tools - [AI Humanizer](https://www.tryleap.ai/humanize): Rewrites AI-generated text to read naturally. Sentence-level before/after scoring. Free for first 500 words. - [AI Content Detector](https://www.tryleap.ai/detect): Free AI text detector with sentence-level scoring, model fingerprinting, and pattern explanations. No signup, no word limit. - [Pricing](https://www.tryleap.ai/pricing): Plan comparison and monthly word allowances. ## Comparisons - [Leap vs ZeroGPT](https://www.tryleap.ai/vs/zerogpt): How Leap compares to ZeroGPT on detection accuracy and humanization. - [Leap vs GPTZero](https://www.tryleap.ai/vs/gptzero): Side-by-side with GPTZero — detection signals and use cases. - [Leap vs Quillbot](https://www.tryleap.ai/vs/quillbot): Humanizer and paraphraser comparison. - [Leap vs Undetectable.ai](https://www.tryleap.ai/vs/undetectable-ai): Pricing and output-quality comparison with Undetectable.ai. - [Leap vs StealthWriter](https://www.tryleap.ai/vs/stealthwriter): Side-by-side comparison with detector bypass rates and pricing. - [Leap vs StealthGPT](https://www.tryleap.ai/vs/stealthgpt): How Leap compares to StealthGPT for humanization quality. - [Leap vs Phrasly](https://www.tryleap.ai/vs/phrasly): Humanizer comparison with Phrasly. - [Leap vs Humbot](https://www.tryleap.ai/vs/humbot): Side-by-side comparison with Humbot. - [Leap vs WalterWrites](https://www.tryleap.ai/vs/walterwrites): Feature and pricing comparison with WalterWrites. ## Reviews - [Review hub](https://www.tryleap.ai/review): Independent first-party reviews of the 8 detectors and humanizers we actually use. - [Originality.ai review](https://www.tryleap.ai/review/originality-ai): Publisher-grade detector with bundled plagiarism — honest take on pricing and fit. - [GPTZero review](https://www.tryleap.ai/review/gptzero): Institutional classroom-first detector with LMS integrations. - [Undetectable.ai review](https://www.tryleap.ai/review/undetectable-ai): Category-leading humanizer incumbent — real advantages vs newer alternatives. - [Copyleaks review](https://www.tryleap.ai/review/copyleaks): Enterprise plagiarism platform with AI detection bolted on. - [Turnitin review](https://www.tryleap.ai/review/turnitin): Institutional detector embedded in school LMS workflows. - [Quillbot review](https://www.tryleap.ai/review/quillbot): Budget writing suite with grammar, paraphrase, and humanizer. - [Winston AI review](https://www.tryleap.ai/review/winston-ai): Premium detector with PDF reports and plagiarism bundle. - [ZeroGPT review](https://www.tryleap.ai/review/zerogpt): Free no-signup checker — best for casual users. ## Alternatives - [Undetectable.ai alternative](https://www.tryleap.ai/alternatives/undetectable-ai): Why writers switch from Undetectable.ai to Leap. - [Quillbot alternative](https://www.tryleap.ai/alternatives/quillbot): A humanizer built for AI detector bypass, not paraphrasing. - [GPTZero alternative](https://www.tryleap.ai/alternatives/gptzero): Free AI detection with sentence-level signal breakdown. ## Per-intent humanize pages - [Humanize for Turnitin](https://www.tryleap.ai/humanize/for-turnitin): Bypass Turnitin's AI indicator on essays and academic writing. - [Humanize for GPTZero](https://www.tryleap.ai/humanize/for-gptzero): Rewrite ChatGPT/Claude text to pass GPTZero's burstiness + perplexity checks. - [Humanize ChatGPT output](https://www.tryleap.ai/humanize/for-chatgpt): Head-term cluster — clean ChatGPT's telltale patterns into human prose. - [Humanize essays](https://www.tryleap.ai/humanize/for-essays): Student-focused humanization for academic essays. ## Free tools - [Tools hub](https://www.tryleap.ai/tools): All 8 free writing utilities in one place. - [Word counter](https://www.tryleap.ai/tools/word-counter): Count words, characters, sentences, and paragraphs in any text. - [Character counter](https://www.tryleap.ai/tools/character-counter): Character count with and without spaces, for social platforms and SEO. - [Reading time calculator](https://www.tryleap.ai/tools/reading-time-calculator): Estimate reading time from word count and reading speed. - [AI score checker](https://www.tryleap.ai/tools/ai-score-checker): Instant AI-likelihood score, no signup. - [Invisible character remover](https://www.tryleap.ai/tools/invisible-character-remover): Strip 37 invisible Unicode codepoints (ZWSP, BOM, bidi marks) that trip detectors. - [AI text formatter](https://www.tryleap.ai/tools/ai-text-formatter): Clean ChatGPT's em-dashes, smart quotes, and markdown-bullet tics. - [Contraction expander](https://www.tryleap.ai/tools/contraction-expander): Bidirectional — expand "don't" to "do not" or add contractions back. - [Pages-to-words](https://www.tryleap.ai/tools/how-many-words-in-pages): Convert N pages to word counts across MLA, APA, single/double-spaced. ## Use-case landing pages - [For students](https://www.tryleap.ai/for-students): Students using AI responsibly — humanize drafts before Turnitin, handle false positives, understand academic-integrity policies. - [For writers](https://www.tryleap.ai/for-writers): Bloggers, novelists, and freelancers drafting with AI and publishing as human. Works with editorial AI policies. - [For marketers](https://www.tryleap.ai/for-marketers): Marketing and content-ops teams scaling AI-assisted content without triggering Google's helpful-content system. - [For bloggers](https://www.tryleap.ai/for-bloggers): SEO bloggers keeping rankings through Google core updates with humanized AI-assisted content. - [For researchers](https://www.tryleap.ai/for-researchers): Academic researchers navigating journal AI policies (Nature, Science, COPE) with disclosed AI assistance. ## Resource hubs - [Blog](https://www.tryleap.ai/blog): Platform-by-platform deep dives on AI detection + hands-on reviews of every major humanizer tool. - [Glossary](https://www.tryleap.ai/glossary): Plain-English definitions of perplexity, burstiness, stylometry, watermarking, tier-1 AI vocabulary, and every other term in AI detection. - [FAQ](https://www.tryleap.ai/faq): 25+ of the most-asked questions about Leap, detection, humanization, pricing, privacy, and use cases. ## Guides - [Learn hub](https://www.tryleap.ai/learn): Primers on AI detection and humanization. - [How AI detectors work](https://www.tryleap.ai/learn/how-ai-detectors-work): The four statistical signals every detector scores. - [Why ChatGPT gets flagged](https://www.tryleap.ai/learn/why-chatgpt-gets-flagged): ChatGPT's specific fingerprints and why paraphrasing doesn't fool detectors. - [Perplexity vs burstiness](https://www.tryleap.ai/learn/perplexity-vs-burstiness): The two core metrics detectors measure, explained. - [AI detection false positives](https://www.tryleap.ai/learn/ai-detection-false-positives): Why human writing sometimes gets flagged as AI. - [How to humanize AI text](https://www.tryleap.ai/learn/how-to-humanize-ai-text): Methodology for rewriting AI content so it reads as human. - [AI detection accuracy](https://www.tryleap.ai/learn/ai-detection-accuracy): Published accuracy numbers vs real-world detector performance. - [Does Turnitin detect AI?](https://www.tryleap.ai/turnitin/does-turnitin-detect-ai): How Turnitin's AI detection works and what it flags. - [Methodology](https://www.tryleap.ai/methodology): How Leap benchmarks itself against other AI humanizers. ## About - Homepage: https://www.tryleap.ai - [About Leap AI](https://www.tryleap.ai/about): Our mission, approach to detection and humanization, editorial team (Leap AI Research), and editorial standards. - [Changelog](https://www.tryleap.ai/changelog): Reverse-chronological log of features, improvements, and fixes shipped to Leap. - Headquartered: remote-first - Contact: hello@tryleap.ai (general) · support@mail.tryleap.ai (account/billing) ## Privacy Leap does not train on user-submitted text. Inputs are processed through language models to produce detection scores or humanized output, then discarded. See [Privacy](https://www.tryleap.ai/privacy) for full details.