tesseract.js and tesseract
The JavaScript binding (A) wraps the C++ engine (B) to enable OCR functionality in web and Node.js environments, making them complementary tools where A depends on B as its underlying engine.
About tesseract.js
naptha/tesseract.js
Pure Javascript OCR for more than 100 Languages 📖🎉🖥
Based on the README, here's a technical summary: Wraps the Tesseract OCR engine as WebAssembly to enable client-side and server-side text extraction, with worker-based concurrency support for parallel image processing. Uses language model downloads on first run (now 50-73% smaller than v5) and supports multiple output formats including hOCR and granular block-level data. Runs in browsers via CDN/webpack/ESM and Node.js v16+, with no PDF support or model optimization in scope.
About tesseract
tesseract-ocr/tesseract
Tesseract Open Source OCR Engine (main repository)
Combines LSTM-based neural net recognition with legacy character pattern matching engines, supporting 100+ languages and multiple output formats (hOCR, PDF, TSV, ALTO). Exposes `libtesseract` C/C++ APIs for embedding in applications, with traineddata files enabling language-specific model swapping. Built on Leptonica for image I/O and supports per-page segmentation modes and OCR engine selection via command-line flags.
Scores updated daily from GitHub, PyPI, and npm data. How scores work