SubFrenzy vs iSub Player

Add audio files (MP3 or M4A format) with corresponding subtitle files. During playback, subtitles are displayed in a list, supporting skip-ahead or rewind based on subtitle cues. Add video files (MP4) with corresponding subtitle files. During playback, subtitles are displayed in a list, supporting skip-ahead or rewind based on subtitle cues. Double-click a subtitle in the list to jump to the corresponding segment in the audio or video playback. Set the number of repetitions (3–99 times) for a single subtitle line to enhance listening training, with adjustable intervals to customize the rhythm for shadowing practice. Bookmark subtitles during playback, and practice them efficiently by batch-playing from the favorites list. Click on a subtitle to trigger word-by-word translation (local translation). Even without audio or video files, upload subtitle files alone to play subtitles using authentic American pronunciation powered by AI-trained models. Supports playback speed adjustment, software interface language settings, and more, with continuous updates. The software includes a user guide with detailed instructions and screenshots.

With features such as dual subtitles, an independent subtitle panel, subtitle-based seeking, sentence repetition, and favorites, iSub Player turns your local videos into effective learning materials. Whether you are learning English, Japanese, Korean, French, Spanish, or other languages, iSub Player provides a more efficient viewing and learning experience. 【Efficient Subtitle Learning】 • Display dual subtitles for side-by-side learning • Independent subtitle panel with free scrolling • Tap subtitles to jump to the exact position • Repeat individual sentences for practice • Shadowing, Record & Compare to Original • Save subtitles, screenshots, and audio clips with one tap • Quickly open AI websites to analyze subtitles and words • Subtitle Masking for a Pure Listening Environment • Automatically recognize and generate subtitles 【Professional Local Media Player】 • Supports popular video formats including MP4, MKV, MOV, AVI, WEBM, FLV and More • Supports popular audio formats including MP3, AAC, FLAC, M4A, WAV, WMA and More • Supports multiple audio track switching and audio Delay • Supports embedded subtitles and external SRT, ASS subtitles, and LRC lyrics • Customizable subtitle delay, font size, and subtitle styles 【Powerful Media Library】 • Import local video and audio files • Automatically scan folders to create playlists • Browse with list and grid views • Multiple sorting options • Automatically save playback history • Quickly search media files • Convenient long-press action menu • Support batch selection and batch operations • Private folders with password protection 【Favorites & Learning Management】 • Save subtitle sentences, words, screenshots, and audio clips • Categorize learning materials • Quickly search saved content • Export and import favorites data without quality loss 【Professional Playback Experience】 • High-precision timeline seeking • Playback speed adjustment while maintaining audio pitch • Automatically remember playback progress • Gesture controls for brightness, volume, and playback position • Double-tap to fast forward or rewind • Pinch-to-zoom video display • Support playlist loop, single-item loop, and single playback modes 【Background Playback】 • Continue audio playback in the background • Lock screen media controls • System notification playback controls 【Rich Personalization Options】 • Multi-language interface • Customizable subtitle styles (font size, color, position, outline, background, bold, etc.) • Playback preferences • Translation settings • Light mode, dark mode, and system theme support • Customizable external keyboard shortcuts iSub Player focuses on local media playback and language learning. It does not provide any online video content. All media files come from the user's device or are imported by the user. Whether you are watching movies, TV shows, anime, or documentaries, or practicing listening, subtitle-based learning, speaking shadowing, and language skills, iSub Player is your ideal companion for turning local videos into effective learning resources.