About FlowSub
What is FlowSub?
FlowSub is an AI-powered content creation platform. It combines six essential media tools — transcription, image generation, video creation, voice synthesis, music composition, and file conversion — into a single subscription. No ads, no watermarks, no separate bills.
Built on OpenAI Whisper for transcription and FFmpeg for media processing, FlowSub handles everything from generating precise subtitles in 29+ languages to composing original music. Upload any video or audio file and get accurate SRT, VTT, ASS, or TXT subtitles in minutes.
Who built this?
FlowSub is built and maintained by Antonio Foti, a software developer focused on AI-powered creative tools. The platform was created to solve a personal frustration: generating subtitles for video content required juggling multiple expensive subscriptions. FlowSub consolidates transcription, media processing, and AI generation into one affordable tool.
Why FlowSub?
- No ads. Every tool is available without interruptions. The platform is funded by subscriptions, not ad revenue.
- One subscription. Starter ($8.99/mo) covers full transcription + FFmpeg tools. Pro ($16.99/mo) unlocks all AI generation. No separate bills for transcription, voice, image, and music.
- Privacy-first. Uploaded files are processed and deleted. Subtitle data is not used for training or shared with third parties.
- 29+ languages. OpenAI Whisper automatically detects the spoken language and generates subtitles with near human-level accuracy.
Technology
FlowSub uses OpenAI Whisper (Groq-hosted) for transcription, Google Gemini 2.0 Flash for subtitle translation, and FFmpeg for media processing. Storage is on Cloudflare R2. The frontend is built with Next.js 16 and TypeScript, styled with Tailwind CSS v4, and deployed on Vercel. Authentication is handled by Clerk, payments by Stripe.