Yes. MulmoCast is open source under the AGPL-3.0-only license and free to install. You still pay the AI providers you connect, such as OpenAI or ElevenLabs, for the images, speech and video they generate.

Do I need to know how to code to use MulmoCast?

You need some comfort with a terminal. The MulmoCast CLI installs through npm and runs as a command line tool, so basic command line skills help a lot. The interactive scripting mode lowers the bar, but it isn't a click and drag app.

Does MulmoCast work on Windows and Mac?

Yes. The MulmoCast CLI runs anywhere Node.js and ffmpeg are available, which covers macOS, Linux and Windows. You can also run it inside Docker, which bundles the prerequisites for you.

Can MulmoCast make a podcast instead of a video?

Yes. The same script can output audio, video, a slideshow, a PDF or a manga. If you want audio only, you generate the speech stage and skip the movie render.

Which AI providers does MulmoCast support?

It works with OpenAI, Google Gemini, Anthropic, Replicate and ElevenLabs, and it supports Vertex AI and Azure OpenAI for enterprise use. You add API keys in a .env file and pick a provider per task.

Is MulmoCast a good fit for a non-technical team?

It can work if someone on the team is comfortable with a terminal and API keys. Without that person, the setup steps will slow a non-technical team down. Teams that want a purely visual editor should weigh other options.

MulmoCast

Receptron · Productivity · Other

MulmoCast is an open-source AI presentation tool from Receptron that turns a text script into video, podcast, slideshow, PDF or manga, and it runs as a command line app for free.

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About MulmoCast

What Is MulmoCast

MulmoCast is an AI-native presentation tool, and it works more like a render pipeline than a slide editor. Receptron, the team behind the GraphAI workflow engine, built it for the AI era. Instead of designing slides by hand in PowerPoint or Keynote, you describe your content in plain language and let a large language model draft the structure. MulmoCast then renders that structure into several output formats from a single source file.

The center of the product is MulmoScript, a JSON format that works like a screenplay. It stores speakers, narration, images and layout in one place, which is why the same script can become a narrated video, an audio podcast, a slideshow, a PDF or a comic. That flexibility appeals to people who publish the same idea across several channels and don't want to rebuild it each time.

The trade-off is that MulmoCast is a tool for makers. It ships as a command line app you install with npm, and it leans on external AI providers for images, speech and video. You bring your own API keys, and the creative output depends on how well you write the script and configure those providers. There's no drag and drop editor and no drag to fix a broken scene.

Getting Started

Install Node.js, then run npm install -g mulmocast and install ffmpeg on the same machine.
Create a .env file with the API keys for the providers you want, such as an OpenAI key for images and a text to speech provider.
Run mulmo tool scripting -i to build a MulmoScript through an interactive chat, or write the JSON yourself.
Run mulmo audio, mulmo images and mulmo movie in order, or just mulmo movie your_script.json to generate everything at once.
Find the finished file in your output folder and publish it to the channel you need.

Product Information

A quick look at MulmoCast's pricing, supported platforms, and performance.

Free PlanYes

Paid Plans$0 (open source, you pay AI providers directly)

PlatformCLI (Node.js), macOS, Linux, Windows via npm and Docker

DeveloperReceptron

CategoryProductivity · Other

Release DateMay 2025

Latest UpdatedOct 2026

Website Visits649.3M

Website Global Rank50

API AvailabilityN/A

Best for

The users, tasks, and scenarios where this tool fits best.

Users

Developers and makers
Podcasters and video creators
Educators and marketers

Tasks

Turning a research report into a podcast
Building a narrated video from a pitch
Translating content across languages

Scenarios

Repurposing one idea for many platforms
Producing content on a schedule
Prototyping a visual story

Key features

MulmoScript Source Format

MulmoScript is the JSON file that describes your whole presentation, including speakers, narration, images and layout. Because everything lives in one structured file, you can version it, translate it and re-render it into any supported format without rebuilding the content by hand.

Multi-Format Output

A single script can produce a video, an audio podcast, a slideshow, a PDF and even a manga or swipe anime. That range is the core promise: you write once and publish wherever your audience already is, from a commute podcast to a shared slide deck. The slideshow and manga paths reuse the same beats, so a comic and a deck stay in sync.

AI Script Generation

The mulmo tool scripting command chats with a large language model to draft your script from a topic, a URL or a local file. It removes the blank page problem, and you can feed it content from ChatGPT or Claude if you'd rather write the beats elsewhere.

Speech, Image and Video Rendering

Separate commands handle each stage: mulmo audio builds narration, mulmo images creates visuals, and mulmo movie combines them. You can also estimate cost and usage before a run, which keeps spending predictable when you generate at scale.

Bring Your Own Providers

MulmoCast connects to models from OpenAI, Google Gemini, Anthropic, Replicate and ElevenLabs, plus Vertex AI and Azure OpenAI for enterprise setups. You choose the provider per task, so you can trade quality against cost depending on the project.

Translation and Subtitles

The mulmo translate command renders your script in another language, and the movie command can burn subtitles into the video. For teams publishing in several languages, this turns one source script into a localized set of assets.

Open Source and Portable

MulmoCast is released under the AGPL-3.0-only license and runs from npm, Docker or a plain Node.js install. That gives you full control over the pipeline, and you can inspect or extend the code rather than relying on a closed hosted service.

Pros and cons

Pros

Turns one script into video, podcast, slideshow, PDF and manga.
Free and open source under AGPL, so there's no subscription to start.
Commands and usage estimation keep generation costs visible.
Connects to major AI providers, including enterprise Vertex AI and Azure.
Scripts are plain JSON, which makes versioning and automation easy.

Cons

It's a command line tool, so non-technical users face a real learning curve.
You must supply and pay for your own AI provider keys.
Output quality depends on provider setup and how carefully you write the script.
No drag and drop visual editor for fixing scenes after the fact.

Frequently asked questions

Acting as both an AI presentation generator and a slideshow generator, MulmoCast turns a text script into multi-modal output. You write a MulmoScript and render it as a narrated AI video generator flow, a podcast, a slideshow, a PDF or a manga, so one source covers several formats.

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