Personal project · Windows

Prisma.

Overview

I built Prisma to save myself the €30 a month for Loom. I wanted to record my screen, appear in a camera bubble and explain my projects with a tool of my own. The result is a Windows desktop application, free for non-commercial use, that saves videos on my computer.

It records an entire screen, a window or a selected area, with camera, microphone and system audio. I can choose the resolution and frame rate, adjust the camera bubble and customise the background, margins and corners. Cursor zoom and click highlights make explanations easier to follow.

I can also use my phone as a camera and microphone through VDO.Ninja: I open a link in the phone browser and connect it to Prisma over the Internet. A floating widget, keyboard shortcuts and a teleprompter let me control the recording and follow a script without losing my place.

I integrated local Whisper transcription with TXT and SRT export. After downloading the model, transcription works offline. Videos are saved as WebM; MP4 export requires FFmpeg. Alongside the application, I designed its website with a guided tour through real screenshots and an .exe installer so anyone can get started on Windows without programming tools.

How it was built

01Electron
02JavaScript · HTML · CSS
03Python
04Whisper
05VDO.Ninja

Visit live site

Real Prisma screenshots · the cover uses demo content. Phone connection and transcription are shown before starting.

✓ Result

“My own tool for recording and explaining projects, without the €30 monthly subscription I wanted to avoid.”

Gallery.

01 —

Shape every recording

Adjustable backgrounds, margins, corners and camera bubble give demos a considered composition. Zoom and click highlights draw attention to what I am explaining.

02 —

My phone is a camera too

I connect the phone camera and microphone from its browser using a VDO.Ninja link. This connection requires Internet access; the screenshot shows the panel before connecting the phone.

03 —

Keep the script close

The teleprompter keeps the script visible with adjustable size, speed and opacity. Together with the floating widget and shortcuts, it helps me record without interrupting the presentation.

04 —

From speech to text, locally

Whisper transcribes audio on the computer itself, with TXT and SRT exports. The model downloads once; I can then transcribe offline. The screenshot shows the panel ready to load a video.

From a subscription I wanted to avoid to an application I can share. Explore the guided demo and download the Windows installer on the Prisma website.

Explore and download Prisma