# Typebulb > Typebulb runs apps in markdown files called bulbs. Quick to make & share, runs online or locally, & can call an LLM at runtime. A bulb is a single markdown file with fenced code blocks (TypeScript/React code, notes, config). Every bulb page has a raw markdown version at the same URL with a `.md` suffix. ## Docs - [FAQ](https://typebulb.pages.dev/faq): what Typebulb is, the tb.* API, how inference works