Sapling AI Detector

Sapling AI Detector is a free checker for pasted text, PDFs, and Word documents. It serves educators, SEO practitioners, content moderators, and teams that need an early signal before review. The tool returns an overall probability, highlights likely AI sentences, and warns that no detector should be treated as proof.

Key Highlights

• Checks pasted text and text-selectable PDF/DOCX files; scanned images need OCR first
• Shows an overall AI-generated probability with highlighted sections
• Adds sentence-level perplexity scores for generic or simplistic text
• Browser extension runs detection on selected web and chatbot text
• AI detector API access supports automated or high-volume workflows
• Model coverage changes as the detector is updated

What Makes It Different

Sapling explains the result as a review aid, not a final verdict. A Transformer-based classifier estimates whether each token is AI-generated, then pairs the full-text score with sentence-level perplexity.

Accuracy depends on dataset, text length, model version, and threshold. Evaluate false positives and missed detections on examples from your workflow. Sapling also says shorter, more general, or essay-like writing can trigger false positives, so human review still matters.

Features & Capabilities

The main workflow is simple: paste text into the editor or upload a PDF or DOCX file, then review the score and highlights. Longer text and the intended workflow affect the assessment. Free users can query up to 2,000 characters at a time, while Pro and Enterprise subscribers can paste up to 100,000 characters.

The browser extension adds a Detect AI button for selected text on other websites, including chatbot pages, and lets users edit the analyzed text and recheck it. For repeat checks, Sapling points to API documentation and enterprise plans for high-volume uses such as resume screening.

User Ratings and Testimonials

False positives and false negatives can occur. Evaluate the detector on examples from the intended workflow and review the text in context. A score should support a documented screening process, rather than serve as the only basis for accusing a writer or rejecting a submission.

Pricing & Value

• Free: $0/month, with the web detector and free queries up to 2,000 characters per query
• Pro: $25/month for individuals, with a free 1-month trial and longer detector queries up to 100,000 characters
• Enterprise: Contact sales, starts at 10 seats at $15/seat/month for teams
• API: Metered pricing for developers, listed separately from the seat-based plans

The free plan is enough for spot checks. Pro covers longer queries and Sapling's broader writing features, while API and Enterprise fit repeat detection workflows.