Caption.IM

Caption.IM is a privacy-first AI captioning assistant built exclusively for macOS. It transforms any audio from your computer into real-time subtitles, instant translations, recordings, and structured meeting notes. The key difference is that everything processes locally on your device. No cloud uploads, no third-party servers, no data leaving your Mac. This is a lightning-fast tool that works directly with system audio, meaning it captures captions from any application without needing browser extensions or clunky meeting bots. Whether you are on Zoom, Google Meet, Microsoft Teams, watching YouTube, listening to podcasts, attending online courses, or reviewing recorded videos, Caption.IM delivers instant, accurate captions.

The product is designed for professionals, students, content creators, researchers, and anyone who needs to capture spoken information quickly. It eliminates the friction of manual note-taking and the privacy risks of cloud-based transcription services. Caption.IM leverages local AI and Local LLMs to deliver ultra-fast speech recognition with minimal latency. It is optimized for Apple Silicon (M1, M2, M3, and later) to ensure efficient power usage and blazing-fast performance. The result is a tool that turns any conversation into searchable, translatable, and actionable knowledge in real time. No complicated setup. No bots. No browser dependency. Just pure speed and efficiency.

Real-Time Transcription

Generate live captions for any audio on your Mac instantly. Whether you are in a video call, watching a lecture, or listening to a podcast, Caption.IM converts speech to text in real time with remarkable accuracy. The transcription appears in a floating subtitle window that overlays seamlessly on your screen. You can read along as the conversation happens, ensuring you never miss a single word. The local processing means zero lag and no buffering delays.

Instant Multi-Language Translation

Break down language barriers at lightning speed. Caption.IM provides real-time translated subtitles for content in multiple languages. This feature is perfect for multilingual teams, international meetings, or consuming foreign language media. The translation happens locally on your device, so there is no need to send audio to external servers. You get instant, accurate translations that appear alongside the original captions, allowing you to understand and engage with any content immediately.

Floating Subtitle Window

The elegant, transparent overlay is designed to work flawlessly with macOS. This floating window stays on top of your other applications, allowing you to read captions while continuing to work. You can reposition it anywhere on your screen, resize it, and customize its appearance to suit your workflow. It is unobtrusive yet always visible, providing a frictionless captioning experience that does not interrupt your focus or productivity.

AI Meeting Summaries and Notes

Turn long discussions into structured summaries, key points, action items, and even mind maps automatically. After a meeting, lecture, or conversation, Caption.IM generates a concise, well-organized summary that captures the essential information. This feature saves you hours of manual note-taking and ensures you never lose critical insights. The AI processes the transcription locally to identify the most important elements, delivering a clean, actionable output in seconds.

Remote Meetings and Video Conferencing

For professionals who spend hours in Zoom, Google Meet, or Microsoft Teams calls, Caption.IM is a game-changer. It provides real-time captions so you can follow conversations more easily, especially in noisy environments or when participants have heavy accents. The AI summaries capture action items and decisions instantly, so you never have to scramble to remember what was agreed upon. No bots join your meetings, maintaining the privacy and integrity of your discussions.

Online Learning and Education

Students and lifelong learners can use Caption.IM to caption lectures, online courses, and educational videos. The real-time transcription helps with comprehension and note-taking, while the translation feature allows you to access content in languages you are learning. The ability to record and generate summaries means you can review key concepts later without rewatching entire videos. This accelerates learning and improves retention significantly.

Multilingual Team Collaboration

Global teams often face language barriers that slow down communication. Caption.IM solves this by providing instant translations during live meetings or recorded content. Team members can read captions in their preferred language while the conversation continues naturally. This fosters inclusivity, reduces misunderstandings, and speeds up decision-making across international offices. The local processing ensures sensitive business discussions remain private.

Content Creation and Research

Content creators and researchers can use Caption.IM to transcribe interviews, podcasts, webinars, and livestreams in real time. The structured summaries and key points make it easy to extract quotes, ideas, and data without manual transcription work. Researchers can capture insights from academic talks or focus groups with lightning speed. The floating subtitle window also helps creators add accurate captions to their videos for accessibility and SEO benefits.

Does Caption.IM work with any app on my Mac?

Yes. Caption.IM captures system audio directly, so it works across virtually any application on your Mac. This includes Zoom, Google Meet, Microsoft Teams, YouTube, Apple Podcasts, online courses, livestreams, webinars, and any recorded video player. You do not need browser extensions or meeting bots. It just works.

Is my data private and secure?

Absolutely. Caption.IM is built with a privacy-first architecture. All speech recognition and processing happens locally on your device. Your conversations, audio, and transcriptions never leave your Mac. No data is sent to external servers. This ensures your sensitive discussions remain completely confidential and under your control.

What are the system requirements for Caption.IM?

Caption.IM requires macOS 15.6 or later. It is optimized for Apple Silicon (M1, M2, M3, and later) to deliver ultra-fast speech recognition with minimal latency and efficient power usage. The app is 18.1 MB in size and is available in English. It is designed for maximum speed and performance on modern Mac hardware.

How does the subscription and pricing work?

Caption.IM is available as a free download with in-app purchases. Subscriptions automatically renew unless canceled at least 24 hours before the end of the current billing period. For specific pricing tiers and plan details, please refer to the in-app purchase options or visit the official website. The privacy policy and terms of use are available at caption.im/privacy and caption.im/terms.