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See exactly which sentences are AI-generated. Every sentence gets its own probability score — not just an overall number.
Get AI vs. human probability scores in seconds. Clear verdict with confidence percentage and detailed analysis breakdown.
Works with text from ChatGPT, GPT-4, Claude, Gemini, Llama, Copilot, and any other AI writing tool on the market.
An AI content detector (also called an AI checker) is a tool that analyzes text to determine whether it was written by a human or generated by an AI model like ChatGPT, Claude, or Gemini. It works by examining token probability, sentence structure, vocabulary patterns, and stylistic markers that differ between human and machine-generated writing. Filator's AI detector provides an overall AI vs. human score, a clear verdict, and a sentence-by-sentence breakdown.
The AI detection market has grown rapidly since ChatGPT's launch in late 2022. GPTZero (17 million users, founded January 2023) and Originality.ai are dedicated detection platforms. Copyleaks claims 99% accuracy. Turnitin has integrated AI detection into its plagiarism checker used by 3,500+ colleges. Filator approaches detection differently — as one tool in a full AI productivity platform, with sentence-level analysis that helps you understand results instead of just flagging content.
Unlike basic detectors that only give an overall score, Filator breaks down every sentence with its own AI probability — so you can see exactly which parts were AI-generated.
You get a plain-English verdict (Likely AI, Mixed, Likely Human) plus percentage scores and a detailed analysis — not just a confusing number.
Detects text from ChatGPT (GPT-3.5, GPT-4, GPT-4o), Claude, Google Gemini, Meta Llama, Microsoft Copilot, DeepSeek, and any other LLM.
Filator isn't just a detector — it's a complete AI platform with content rewriting, email writing, essay generation, code tools, image generation, and more.
Strong indicators of AI generation — repetitive patterns, uniform sentence length, predictable vocabulary.
Some AI markers present, but not conclusive. Could be AI-assisted writing or a formal writing style.
Contains both AI and human writing indicators. Common with AI-generated text that was edited by a person.
Mostly human-written patterns detected, with minor elements that could be AI-influenced.
Strong indicators of human authorship — varied sentence structure, personal voice, natural flow.
Check student essays and assignments for AI-generated content before grading. The sentence breakdown shows exactly which parts need attention.
Verify that freelancer submissions are original human-written content, not AI-generated filler.
Ensure blog posts and landing pages pass AI detection before publishing for search rankings.
Self-check your own writing to make sure it doesn't accidentally trigger AI detectors.
| Feature | Filator | GPTZero | Copyleaks | Originality.ai |
|---|---|---|---|---|
| Free tier | 5 credits free | 300 words/month free | 10 pages free trial | No free tier |
| Sentence-level analysis | Yes | Yes | Yes | Yes |
| Claimed accuracy | Sapling API | 99.3% | 99%+ | 83-100% |
| Paid price | From $9.99/mo (full platform) | From $9.99/mo | From $7.99/mo | From $14.95/mo |
| Plagiarism checker | No | Yes | Yes | Yes |
| Classroom integrations | No | Canvas, Google Classroom | LMS integrations | No |
| Other tools included | 73+ tools (AI, PDF, image) | AI Tutor, Grammar | Code AI detection | Readability checker |
When to choose Filator: You need AI detection as part of a broader toolkit (content writing, image editing, PDF tools). When to choose GPTZero: You need classroom integrations and dedicated academic workflows. When to choose Copyleaks/Originality: You need combined AI detection + plagiarism checking in one tool.
Over 1 million educators use AI detectors as part of their grading workflow (GPTZero, 2026). But AI detection should be a conversation starter, not a verdict. False positives happen — GPTZero reports a 0.24% false positive rate, but Originality.ai has been measured at 14.3% in some tests. Non-native English speakers are disproportionately flagged (GPTZero reports 2% ESL bias, the lowest of any major detector).
Filator's sentence-level breakdown is designed for this use case. Instead of telling a student "your essay is 85% AI," you can show them which specific sentences were flagged and have a productive discussion about their writing process.
AI detectors analyze text using several signals that differ between human and machine-generated writing:
Filator uses a dedicated AI classification model (not a generic chatbot) to analyze text for patterns typical of machine-generated content. It evaluates token probability, sentence structure, vocabulary distribution, and stylistic markers to produce an overall score and per-sentence breakdown.
Yes. The detector works with text from all major AI models including ChatGPT (GPT-3.5, GPT-4, GPT-4o), Anthropic Claude, Google Gemini, Meta Llama, Microsoft Copilot, DeepSeek, and others. It analyzes writing patterns common across all language models.
Unlike basic detectors that only give an overall score, Filator breaks down each individual sentence with its own AI probability percentage. This lets you pinpoint exactly which sentences triggered the detection, making it useful for teachers and editors who need to identify specific AI-written sections.
The minimum is 30 words, but we recommend at least 100 words for the most accurate results. Longer texts give the detector more data points to analyze, which improves confidence in the verdict.
No AI detector is 100% accurate — this is true for every tool on the market, including GPTZero and Copyleaks. Results should be used as one data point, not as definitive proof. Heavily edited AI text or very formal human writing can sometimes produce unexpected results.
Credits scale with text length — 10 credits per 1,000 characters (minimum 10 credits). A typical 500-word check costs about 30 credits. Free users get 5 credits to start. Pro ($9.99/mo) includes 5,000 credits and Premium ($24.99/mo) includes 12,000 credits.
Text that has been paraphrased or humanized by tools may score lower on AI detection. However, significant AI-generated patterns often remain. The detector's "Mixed" verdict is designed to flag content that shows signs of both AI and human involvement.
Top detectors claim 95-99% accuracy. GPTZero reports 99.3% with a 0.24% false positive rate. Originality.ai has been measured at 83-100% depending on the test. No detector is perfect — all produce false positives and false negatives. Use results as one data point, not definitive proof.
Instead of giving one overall score, sentence-level detection assigns each individual sentence its own AI probability. This lets teachers see which specific sentences were flagged, editors identify which paragraphs need rewriting, and writers understand exactly what triggered the detection.
Yes. The sentence-by-sentence breakdown is designed for educators. It shows which specific sentences are flagged, so you can have an informed conversation with students rather than making accusations based on an overall score.
GPTZero is a dedicated AI detection platform with 17 million users and classroom integrations. Filator is a broader AI productivity platform with detection as one of 73+ tools. Both offer sentence-level analysis. Choose GPTZero for academic workflows; choose Filator if you also need content writing, image editing, and PDF tools.
Bottom line: Filator's AI content detector uses the Sapling API to analyze text for AI-generated patterns, providing sentence-level breakdown with 5 clear verdicts (Likely AI to Likely Human). It detects text from ChatGPT, Claude, Gemini, Llama, Copilot, and other LLMs. Unlike dedicated detectors like GPTZero (17M users, from $9.99/mo) or Originality.ai (from $14.95/mo), Filator includes AI detection as part of a 73-tool platform. No AI detector is 100% accurate — use results as evidence, not proof.
Paste any text above to get an instant AI vs. human analysis with sentence-level breakdown. See exactly which parts of your content are flagged as AI-generated.