Septalingua

Septalingua is a privacy-first reader for books, documents and images in 20+ formats. Translate and explore grammar with AI, use online medical references and downloadable offline dictionaries. Recognize printed text locally with OCR, edit PDFs and images, and protect backups with on-device encryption. Available as a web app and PWA in 9 interface languages. All implemented features are free during public alpha, subject to technical and usage limits.