Caption.IM

Caption.IM is a privacy-first AI captioning assistant designed exclusively for macOS. It transforms any audio from your computer into real-time subtitles, instant translations, recordings, and structured meeting notes, all processed locally on your device. Unlike browser extensions or meeting bots that require integration with specific platforms, Caption.IM captures system audio directly, making it compatible with virtually any application on your Mac. This includes popular video conferencing tools like Zoom, Google Meet, and Microsoft Teams, as well as media platforms such as YouTube, online courses, podcasts, livestreams, webinars, and even pre-recorded videos. The primary value proposition of Caption.IM is its combination of powerful AI-driven functionality with uncompromising privacy. By running speech recognition and language processing entirely on your Mac, your conversations and audio data never leave your device. This makes Caption.IM an ideal solution for professionals, students, researchers, content creators, and anyone who needs to improve productivity, accessibility, and information equity. Built with local AI and Local LLMs in mind, Caption.IM eliminates the need for bots joining your meetings, browser dependency, or complicated setup procedures. It is optimized for Apple Silicon (M1, M2, M3 and later) to deliver ultra-fast speech recognition with minimal latency and efficient power usage. Whether you are participating in remote meetings, learning from online courses, working in multilingual teams, or creating content, Caption.IM turns any conversation into searchable, translatable knowledge instantly.

Real-Time Transcription

Caption.IM generates live captions for any audio source on your Mac. Whether you are in a video meeting, watching a YouTube video, listening to a podcast, or attending a webinar, the application transcribes speech into text in real time. This feature ensures you never miss a word, making it invaluable for note-taking, review, and accessibility. The transcription appears in a floating subtitle window that elegantly overlays your screen, seamlessly integrating with the macOS environment.

Instant Translation

Break down language barriers with real-time translated subtitles. Caption.IM can translate multilingual content as it is spoken, allowing you to understand conversations, presentations, and media in multiple languages. This feature is particularly useful for global teams, international meetings, online courses in foreign languages, and consuming content from around the world. The translations appear alongside the original captions, providing immediate comprehension without interrupting the flow of audio.

AI Meeting Summaries

After any conversation or meeting, Caption.IM automatically generates structured summaries, key points, and action items. This feature transforms long discussions into clear, actionable insights that can be quickly reviewed and shared. The AI analyzes the entire transcription to extract the most important information, saving you time and ensuring nothing critical is overlooked. You can also generate mind maps to visualize the structure of discussions, making complex topics easier to understand.

Floating Subtitle Window

Caption.IM features an elegant, transparent overlay that displays captions directly on your screen. This floating subtitle window works seamlessly with macOS and can be positioned anywhere on your display without interfering with your workflow. The window is designed to be unobtrusive yet highly readable, ensuring that captions are always visible when you need them. This feature is essential for maintaining focus during meetings, lectures, or while watching videos, as it keeps the text in your line of sight without cluttering your workspace.

Remote Meetings and Video Conferencing

Professionals participating in Zoom, Google Meet, Microsoft Teams, or other video conferencing platforms can use Caption.IM to generate live subtitles for every conversation. This is particularly beneficial for participants who are non-native speakers, have hearing impairments, or work in noisy environments. The real-time transcription ensures everyone can follow along, and the AI-generated summaries provide a record of decisions, action items, and key points for later review.

Online Learning and Education

Students and educators can leverage Caption.IM to enhance online courses, lectures, and webinars. The real-time captions make it easier to follow complex material, take accurate notes, and review content after the session. The translation feature allows learners to access courses in languages they are not fluent in, expanding educational opportunities. Researchers can also use the tool to transcribe interviews, seminars, and recorded lectures for analysis and citation.

Multilingual Team Collaboration

In global organizations where team members speak different languages, Caption.IM facilitates seamless communication. During meetings, the instant translation feature allows participants to understand each other in real time, reducing misunderstandings and improving collaboration. The recorded transcripts and summaries can be shared across the team, ensuring that language differences do not hinder productivity or information flow.

Content Creation and Accessibility

Content creators, including podcasters, YouTubers, and livestreamers, can use Caption.IM to generate accurate subtitles for their content. This improves accessibility for viewers with hearing impairments and helps reach a wider audience, including non-native speakers. The tool also simplifies the process of creating show notes, transcripts, and summaries, saving creators time while enhancing the value of their content.

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

Yes, Caption.IM captures system audio directly, meaning it works with virtually any application that produces sound on your Mac. This includes video conferencing tools like Zoom, Google Meet, and Microsoft Teams, as well as media players, web browsers playing YouTube or online courses, podcast apps, and more. There is no need for browser extensions or application-specific integrations.

Is my audio data private and secure?

Absolutely. Caption.IM is built with a privacy-first approach. All speech recognition and language processing can run locally on your device. Your conversations and audio data never leave your Mac, ensuring complete privacy. No bots join your meetings, and no external servers process your audio. This makes Caption.IM an excellent choice for handling sensitive or confidential discussions.

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 application size is 18.1 MB, and it is available in English. For the best performance, an Apple Silicon Mac is recommended.

Can I use Caption.IM for languages other than English?

Yes, Caption.IM supports multiple languages for both transcription and translation. You can generate real-time captions in the language being spoken and also translate that content into another language simultaneously. This feature is particularly useful for multilingual teams, international meetings, and consuming content in foreign languages.