Celyn

Celyn provides real‑time audio translation on macOS by capturing microphone, system audio, or both and rendering subtitles directly in the display notch. The translation runs entirely on the device, using Apple’s built‑in speech recognition and translation frameworks, so no audio or transcripts are sent elsewhere. Users activate the service with a single hotkey (⌥T) and can start or stop translation instantly, without opening additional windows.

The utility supports nineteen languages, including English, Spanish, French, German, Japanese, Korean, Mandarin Chinese and Arabic, and works offline after the initial language model download. It is compatible with both Apple Silicon and Intel Macs running macOS 15.0 (Sequoia) or later, and updates are delivered through Sparkle.

Celyn is positioned for individuals who need immediate, private translation during Zoom calls, podcasts, YouTube videos, or in‑person conversations. The product is sold as a one‑time purchase with a free trial, and it emphasizes that all processing is local, keeping user speech private and avoiding any subscription or account requirements.