Page-by-page translation
Read the original and translation side by side. Edit results paragraph by paragraph, save automatically, and resume later.
macOS · Preparing for release
GrayCat PDF
A native Mac PDF workspace built for bilingual reading, with dependable tools for everyday document work.
The first public release is being prepared. There is no public App Store page or download link yet.
One workspace for reading and PDF work
Instant translation
Select text while reading to see a translation and term explanation informed by the current page context.
Two translation paths
Use Apple on-device translation on macOS 15 or later, or connect your own AI provider, compatible endpoint, or local Ollama service.
Reading and page organization
Continuous, single-page, and two-page modes with outline, full-text search, page jumps, thumbnail reordering, and dark mode.
OCR, annotations, and signatures
Make scanned documents searchable, then add highlights, underlines, strikethrough, notes, and handwritten signatures.
Merge, compress, and export
Combine and reorder files, extract pages, create a smaller copy, manage passwords and document properties, and export images, Word, or plain text.
Local-first, with clear network boundaries
PDF files, annotations, signatures, form content, OCR, and ordinary document tools stay on your Mac. GrayCat requires no account and includes no advertising, analytics, or tracking SDKs.
Apple system translation processes text on device. Only after you choose AI translation and confirm the request does the selected text, or the text of the pages you translate, plus page context go directly to your chosen provider or endpoint. The developer runs no relay server and cannot access that content.
API keys stay in this Mac's system Keychain. Read the GrayCat PDF privacy policy for the complete scope, or visit support for common questions.