RxLab introduced RxFilm Studio on Show HN on September 23, 2026 — a native macOS timeline app that scripts, scores, narrates, captions, and renders a marketing video, with an AI agent making edits you review before they land.
2026-09-23 · by Moe Ameen
RxLab, an indie developer working under the rxtech-lab organization, introduced RxFilm Studio on Hacker News on September 23, 2026, describing it as "a video workspace that lets you create and revise videos with AI agent." The stated goal is narrow and practical: independent developers and small teams want marketing videos for their products but don't have the time for editing, effects, voiceover, and subtitles, so RxFilm Studio tries to run that whole pipeline in one place. You start from an idea, a product website, images, or existing footage, and the app builds out story and structure, editing, visual and sound effects, voiceovers, background music, subtitles, and translation.
It is a native macOS app laid out like a conventional editor — a footage library on the left, a viewer in the center, an inspector with each step's parameters and a Generate button on the right, and a sequence timeline along the bottom. Under the hood it wires together several AI providers per task: music generation via Lyria, voiceover through Gemini and Azure text-to-speech, transcription and captions via Whisper/Azure/OpenAI (exportable as VTT or SRT), image stills, and video clips through Veo, with the finished timeline rendered by Remotion to MP4 at up to 4K and 60 fps. An embedded agent window (backed by an MCP server) lets you ask for a change in plain language and review every edit before it's applied, rather than accepting a one-shot black-box render.
The macOS app is free to download, and the project's code is public on GitHub. Generation and an optional in-app marketplace — which sells footage, music, effects, fonts, transitions, and prebuilt compositions — run on a credit/account system tied to RxLab, so the real cost of a project depends on how much generation you do rather than a flat subscription. As with any early, indie release, treat version numbers, model choices, and system requirements as a moving target and confirm them against the app and its repository before planning around a specific detail.
RxFilm Studio is built to make one thing well: a polished product video on your Mac, with an agent you can steer. That is genuinely useful for a launch or a hero explainer. What it deliberately doesn't do is turn that single MP4 into a week of platform-native posts, or keep the content coming after launch day. That second job — distribution and volume — is exactly where [Kompozy](/) picks up. Export the finished video from RxFilm Studio, drop it into Kompozy as a source, and [Clipped Shorts](/glossary/clipped-short) pulls the strongest vertical cuts, auto-captions them, and reframes each to 9:16, 1:1, and 16:9 for every network — so the film you spent an afternoon perfecting becomes a dozen scroll-stopping posts instead of one upload.
Then Kompozy generates the companion content RxFilm's timeline was never meant to produce: a launch [Blog Article](/glossary/output-buckets) and Email Newsletter, brand-exact [Carousels](/glossary/hyperframes) breaking down the product, Quote Graphics, and a face-locked [Persona Short](/glossary/persona-shorts) recapping the news — all held to one voice by the [Persona Brief](/glossary/persona-brief). [Autopilot](/glossary/autopilot) then schedules and publishes the whole set across the eight social platforms plus blog and email from a single queue with a per-post review. Use RxFilm Studio to make the standout video; use [Kompozy as the engine](/ai-video-generation) that clips it, surrounds it with on-brand content, and ships all of it everywhere your audience actually is.
The macOS app is free to download and its code is public on GitHub. Generation and an optional in-app marketplace (footage, music, effects, fonts, transitions, compositions) run on a credit/account system tied to RxLab, so the real cost of a project scales with how much you generate. Confirm current pricing in the app before planning around it.
It builds a marketing or product video end-to-end on a macOS timeline from an idea, a product website, images, or existing footage — generating script/structure, editing, effects, voiceover, background music, captions, and translation. It uses models like Lyria for music, Veo for video, and Whisper for captions, renders with Remotion to MP4 at up to 4K/60 fps, and lets an AI agent make edits you review before they land.
RxFilm Studio is a native macOS app (built for Apple Silicon and a recent macOS release). There is no Windows or web version at launch, and it works project-by-project on your machine rather than as a cloud service.
Not from RxFilm Studio itself — it renders a finished MP4 but has no built-in multi-platform publishing, scheduling, or per-platform reframing. To turn one video into captioned vertical clips and companion posts scheduled across TikTok, Reels, Shorts, LinkedIn, X, and more, pair it with a content engine like Kompozy, which clips, reframes, generates surrounding formats, and publishes across nine platforms.