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What it returns
Document metrics, extractive summary, lexical signals and topic indicators. The methodology is intentionally transparent and lightweight.
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Privacy
Text analysis runs locally in your browser. No external generative API is called. PDF text extraction uses PDF.js in the browser.
Extractive summary
Topic signals
Top lexical signals
Methodology
Language detection uses transparent marker scoring. Keywords combine unigram and bigram frequencies after stopword filtering. The summary scores original sentences against document-level lexical signals. Topic scores use a curated multilingual domain lexicon.
Limitations: ResearchLens is an analytical aid, not a factual verifier. Scanned PDFs require OCR, mixed-language texts can confuse language detection, and heuristic summaries may miss nuance in highly technical documents.