What is Caption.IM?

Caption.IM is a privacy-first AI captioning assistant built exclusively for macOS. It converts any audio from your computer into real-time subtitles, translations, and structured meeting notes — all processed locally on your device. Unlike browser extensions or meeting bots, Caption.IM works directly with system audio, allowing you to capture captions from any application: video calls, online courses, podcasts, livestreams, or videos.

Who it's for

• Remote professionals who need real-time captions and AI-generated meeting summaries from Zoom, Google Meet, or Teams
• Multilingual teams that benefit from instant translation of spoken content into multiple languages
• Students and researchers who want to turn lectures, podcasts, or online courses into searchable, translatable knowledge

Key features

Real-time transcription

Generate live captions for meetings, videos, podcasts, and calls. The app captures system audio directly, so it works with any application without requiring browser extensions or meeting bots.

Instant translation

Understand content in multiple languages with real-time translated subtitles. This makes Caption.IM especially useful for multilingual teams and global collaboration.

Floating subtitle window

An elegant transparent overlay that works seamlessly with macOS. The subtitles appear on top of your other windows, so you can follow along without switching contexts.

AI meeting summaries

Automatically generate structured summaries and key insights after conversations. This turns any meeting or lecture into searchable, actionable notes.

What stands out

Your conversations never leave your Mac.

All speech recognition and processing can run locally on your device. Caption.IM is optimized for Apple Silicon (M1, M2, M3 and later) to deliver ultra-fast speech recognition with minimal latency and efficient power usage. This privacy-first approach means you get real-time captions and translations without sending your audio to any cloud server.

Worth checking out if…

You work on a Mac and need real-time captions, translations, or meeting summaries from any application — without compromising privacy. Caption.IM is especially valuable for remote teams, online learners, and anyone who wants to turn spoken content into searchable, translatable knowledge instantly.