# Tessel, the Calendar That Plans Itself

Style: [Product Demo](https://comotion.design/style/product-demo)
Made by: Leon Lin, @lexnlin on X
Original post: https://x.com/LexnLin/status/2104148233106723099
Length: 33 seconds
Tags: calendar, launch, open source, sound design
Page: https://comotion.design/v/tessel-the-calendar-that-plans-itself

A launch video for a made-up calendar app, where the name, logo, interface, animation, soundtrack and sound effects are all code.

## How it was made

Tools: Claude Code, Claude Opus 5.5

Prompt: 705 words, shown to signed-in members on the page, free with an account.

### Process

Made with Claude Code from a single prompt that ran for about eight hours. Everything seen and heard is code, including the music.

The creator did not post the prompt, but open-sourced the whole project.

**Resources the creator shared:**

- [The code, soundtrack and finished video on GitHub](https://github.com/Leonxlnx/claude-launchvideo)

The prompt shown here was written afterwards from the finished clip, so it describes what is on screen.