How I Developed the Word Captions Android App As someone who thrives on blending technical innovation with practical utility, I set out to create Word Captions, an Android app that automatically adds word-by-word subtitles to videos. The goal was simple: to help users generate precise, machine-powered subtitles seamlessly, while keeping everything on-device for privacy. The Concept The idea emerged from recognizing the growing need for accessible, AI-driven subtitle tools. Existing solutions often lacked customization or required internet access to process videos. I envisioned an app that: Automatically generates captions from audio. Highlights words in sync as they’re spoken. Offers full control over styles, fonts, and colors. Delivers results locally, offline, ensuring data privacy. The Development Journey Technology Stack Challenges and Innovations Word-by-Word Highlighting To achieve accurate syncing of words, I developed an algorithm that parses subtitle timing data and aligns each word's appearance with the audio. This ensured smooth, word-level highlighting without delays. On-Device Language Models Since privacy was paramount, I incorporated downloadable language models into the app. By integrating tokenizers and lightweight speech recognition, I enabled high-quality transcription without an internet connection. Customization Features I wanted users to have creative freedom, so I added options to tweak subtitle styles, colors, and fonts. Whether users wanted sleek captions for social media videos or professional subtitles, Word Captions delivered. Performance Optimization Video processing, especially overlaying text, required balancing speed and quality. I optimized FFmpeg commands and ensured that 1080p rendering retained clarity while keeping file sizes manageable. The Result Word Captions is a user-friendly, AI-powered app that empowers creators, educators, and professionals to effortlessly add customizable, automatic subtitles to videos. Whether you’re captioning for accessibility, content creation, or learning new languages, the app provides an intuitive and efficient solution. The Future I plan to expand the app with: More advanced AI models for improved accuracy. Multi-language support to cater to global users. Additional creative tools for enhancing videos. Developing Word Captions has been a challenging yet rewarding journey, merging my technical expertise and creative drive to solve a real-world problem

Word Captions

Focus on Your Creative Vision While AI Handles the subtitles

Focus on Your Creative Vision While AI Handles the subtitles