Tandis 24 Design Lab logo

Subtitle Sphere

A product of Tandis 24 Design Lab

Subtitle Sphere logo

Welcome to Subtitle Sphere!

Revolutionize Your Audio and Video Content with AI-Powered Transcription, Translation, Subtitling, Voice Generation & More.

Local. Private. Free. Unlimited. No ads. No cloud. No data collection. No registration. No account.
Subtitle Sphere enhanced logo Options Image Showing Features

What is Subtitle Sphere?

Subtitle Sphere is a comprehensive desktop application and multimedia processing powerhouse that revolutionizes video and audio transcription, translation, AI-generated voice synthesis, and subtitling. Offered entirely free of charge with unlimited functionality while ensuring complete data security and user privacy.

Our platform supports both offline and online capabilities: offline transcription, translation, subtitling, voice cloning, and AI voice generation without internet connection, plus real-time transcription, translation, summarization, and cloud-based AI voice generation when connected.

Technologies We Integrated

🎯 Transcription
OpenAI Whisper Open-source speech recognition
Whisper-Google Fusion Our proprietary hybrid model
SpeechRecognition Google Speech Recognition
Feature Highlights • Real-time transcription capabilities
• Transcript optimization engine
🌍 Translation
Deep Translator Google Translate integration
Gemini AI Advanced language processing & Premium translation (API key)
OpenAI GPT Advanced language processing & Premium translation (API key)
Argos Translate Offline translation engine
Feature Highlights • Real-time translation
• Multilingual subtitle generation
🎵 Voice Synthesis
Kokoro TTSOffline High-quality text-to-speech
gTTSGoogle Text-to-Speech
Edge-TTSMicrosoft Edge voices
OpenAI.fmOpenAI voice generation
OpenAI GPT TTSOpenAI voice generation (API key)
Gemini TTSGemini voice generation (API key)
ChatterboxResemble AI voice cloning
Feature Highlights • Multi-engine TTS
• Voice cloning with Chatterbox
• Customizable AI voices
🎤 Audio Processing
DemucsAI-powered vocal isolation
FFmpegAudio/video processing
Feature Highlights • Vocal isolation (separating vocals from music)
• Audio/video merging and extraction
🎥 Video Processing
Built-in video converterFormat conversion
Orientation correctionFix rotations
Resolution scaling480p → 4K
Cross-platform playbackOptimized for all devices
📄 Document Processing
SRT to JSON/VTT, PDF to TXTRobust conversion
URL importVideos & transcripts
Subtitle rulesCustomizable timing
Character optimizationEfficient formatting

All these powerful tools, unified in one simple interface - no Python knowledge required.

🎓
Educators & Course Creators
Global learning with multi-language assets, voiceovers, and subtitles
🔬
Researchers & Academics
International accessibility for presentations, interviews, and documentation
🎥
Content Creators
Professional captions, translations, and voiceovers for global audiences
♿
Accessibility Advocates
Multilingual subtitles and AI narration for inclusive content

Our Journey

November 2024 - August 2025

700+
Global Users Served
15+
Integrated Technologies
30+
Features
100%
Free & Unlimited

Final Release: Version 8.0.1

30+ Professional Features
Cross-Platform Support: macOS (ARM) • Windows 8/10/11

Applications We Power:
Education • Research • Content Creation • Transcription • Translation • Subtitling • AI Narration • Voice Cloning • Vocal Removal • Audio Processing • Video Processing • Document Processing • Text Summarization