AI Detector — Free Checker for ChatGPT, Claude & GPT-5 | Leap AI

Categories: Text & Writing, Productivity, Research | Pricing: Freemium | Official Website ↗

Leap AI's detector checks text for AI authorship, providing a sentence-by-sentence score and identifying the probable source model.

Leap AI's AI Content Detector is a tool designed to identify whether text has been generated by large language models such as ChatGPT, Claude, Gemini, and others. Unlike many detectors that provide a single overall score, Leap AI offers a sentence-by-sentence analysis, highlighting specific passages that appear AI-authored. This granular feedback allows users to understand precisely which parts of their text might need revision to sound more human. The detector works by analyzing statistical signatures left by LLMs, including vocabulary flatness, sentence length uniformity, and token-level probabilities. It combines signals like perplexity and burstiness with a model-specific classifier trained on fresh samples from major LLM releases. The tool also provides model fingerprinting to suggest the probable source model and explains specific AI tells like hedging words or low burstiness. It is designed for various users, including teachers, students, editors, content managers, and hiring teams, to verify content authenticity or refine AI-generated drafts.

Key Features

Sentence-level AI scoring
Color-coded inline highlighting
Model fingerprinting (detects source LLM)
Pattern explanation (shows AI tells)
Detection confidence indicator
Unlimited AI detection scans (free)
Humanization feature (paid plans)

Pros

Provides sentence-by-sentence AI scores for precise editing.
Identifies probable source AI models (ChatGPT, Claude, Gemini, etc.).
Explains specific AI patterns detected in the text.
Offers unlimited AI detection scans for free without signup or word limits.
Continuously updated with new LLM releases for accuracy.

Cons

Short inputs (under 50 words) are difficult for any detector and may yield unreliable scores.
Non-native English writing may have an elevated risk of false positives.
Accuracy can drift as new model versions ship and classifiers update.
Humanization feature, which is a core offering, is limited on the free plan.
No published full precision-and-recall breakdown for independent verification.

Use Cases

Verifying the originality of academic papers
Ensuring content meets human-written standards for SEO
Detecting AI-generated content in marketing materials
Reviewing job application writing samples for authenticity
Refining AI-drafted content to sound more human

Best For

Students checking drafts before submission
Teachers and professors evaluating assignments
Editors and publishers triaging freelance submissions
Content managers and SEO teams auditing writer output
Hiring teams checking writing samples

Platforms: Web

Watch demo on YouTube ↗

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