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Caplo

Real-time AI captions & translation for any iOS app

2026-03-21

Product Introduction

Definition: Caplo is an advanced AI-driven accessibility and productivity utility designed specifically for the iOS ecosystem. It functions as a system-wide real-time transcription and translation engine that leverages iOS's Screen Broadcast capabilities to capture internal system audio or microphone input, processing it through high-performance neural networks to generate live text overlays.

Core Value Proposition: The primary objective of Caplo is to eliminate language barriers and accessibility gaps within mobile environments. By providing a persistent Picture-in-Picture (PiP) captioning window, Caplo allows users to consume non-native content, participate in multilingual meetings, and follow live broadcasts without native subtitle support. It bridges the gap between raw audio output and visual comprehension using low-latency AI transcription, making it a critical tool for globalized digital consumption.

Main Features

System Audio Capture & Real-Time Transcription: Caplo utilizes the iOS Screen Broadcasting framework to route internal system audio directly to its AI processing engine. This technical implementation allows the app to "hear" what is playing inside other applications—such as YouTube, Netflix, or Zoom—without requiring external speakers. The AI engine performs instantaneous speech-to-text conversion, delivering high-accuracy transcripts with minimal latency, ensuring the text remains synchronized with the audio source.

Multi-Language Neural Translation: Supporting over 12 major languages including English, Japanese, Chinese, Spanish, German, and French, Caplo employs sophisticated machine translation models. Users can select a source language and a target language, allowing the app to translate foreign speech on the fly. This is particularly effective for "raw" content (unsubtitled media), where the AI identifies linguistic nuances to provide contextually relevant translations rather than literal word-for-word substitutions.

Floating Picture-in-Picture (PiP) Overlay: The software utilizes the native iOS Picture-in-Picture API to create a floating, resizable text window that hovers over any active application. This ensures that users do not need to switch back and forth between Caplo and their primary app. The PiP window displays scrolling text in real-time, providing a seamless "heads-up display" (HUD) experience for live streams, video calls, and gaming.

iCloud Sync & Markdown Session Management: Beyond live captioning, Caplo serves as a documentation tool. Every session is automatically recorded and synchronized across the user's Apple ecosystem via iCloud. These records include the full transcript and translation, which can be reviewed later, searched, or exported in Markdown format. This feature is essential for technical users and students who need to convert spoken lectures or meetings into structured, editable notes.

Problems Solved

Pain Point: Lack of Native Subtitles in Live and Third-Party Media: Many mobile applications, live streaming platforms (Twitch, TikTok), and video conferencing tools do not provide native or accurate closed captioning, especially for foreign languages. Caplo solves this "content-blindness" by providing a universal subtitle layer that functions regardless of whether the host app supports captions.

Target Audience:

  • Language Learners & Anime Enthusiasts: Users watching "raw" (untranslated) content to improve their listening skills or bypass delay in official fansubs.
  • Remote Professionals: Global workers participating in Zoom or Microsoft Teams calls conducted in their non-native language.
  • Accessibility Users: Individuals who are deaf or hard of hearing requiring real-time visual representation of mobile audio.
  • Content Researchers & Students: Those attending digital keynotes (Apple/Google Events) or university lectures who require an instant, exportable text record of the spoken content.

Use Cases:

  • Live Sports: Following commentary for EPL or NBA games in foreign broadcasts.
  • Technical Keynotes: Reading real-time transcripts of fast-paced tech launches to ensure no technical specifications are missed.
  • Podcasts: Consuming foreign-language podcasts by reading the translated text in real-time.
  • Cross-Border Business: Using the microphone input mode for in-person or digital meetings to ensure clear communication across 12+ languages.

Unique Advantages

Differentiation from Traditional Transcription: Unlike standard voice-to-text apps that require the user to hold a microphone to a speaker, Caplo’s system audio capture ensures high-fidelity data input. It avoids environmental noise interference, resulting in significantly higher transcription accuracy compared to external recording methods.

Key Innovation: The Universal PiP Interface: The integration of real-time AI translation into a mobile PiP window is a significant technical milestone. It transforms the iPhone into a universal translator that stays active while the user interacts with other high-resource apps like games or video players, a feat typically reserved for desktop environments.

Frequently Asked Questions (FAQ)

How does Caplo capture audio from other iOS apps? Caplo uses the "Screen Broadcast" feature of iOS. By starting a broadcast to Caplo, the app can securely access the system's audio output stream. This allows it to process audio from YouTube, Zoom, Netflix, and other apps directly within the AI engine without needing the audio to be played through the device's external speakers.

Is my data and audio privacy protected? Yes. Caplo is designed with privacy in mind, utilizing secure AI processing and leveraging Apple’s iCloud for encrypted data synchronization. Since it uses the system-level broadcast API, users have full control over when the recording starts and stops, and session history is managed within the user's private cloud account.

Can Caplo translate live video calls on Zoom or Teams? Absolutely. By initiating Caplo before joining a video conference, the app will capture the meeting audio and provide real-time captions and translations in the floating PiP window. This allows you to see what participants are saying in your preferred language while still viewing the video feed of the meeting.

Does Caplo work offline? Caplo requires an internet connection to access its high-performance AI transcription and translation models. This ensures that the translation remains fast and accurate, utilizing the latest linguistic data and neural processing power available through Sparklight AI’s cloud infrastructure.

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