About Yuntai

Shanghai Yuntai Information Technology Co., Ltd.

An indie studio, quietly building

Yuntai is a small studio with a slow-growing, broad-covering philosophy — small, patient, useful things, accumulating into something broader than any single product on its own.

Two layers, one studio

Yuntai is the legal home — the registered company in Shanghai that ships products, signs apps, and handles invoices. Firefly Lab is the creator brand under that roof — the person and the voice you meet on Pinterest, Reddit, and other places where we talk about how the products get built. Both names point at the same group of projects; you can think of Yuntai as the company and Firefly Lab as the workshop inside it.

What we build

• Mobile apps — installed software on iOS and Android. GrowBook is our first.
• Web tools — browser-based products like OmniEmoji, MakeLineArt, and Taplup.
• Mini programs — lightweight experiences inside major mini-program platforms.
• Experiments — smaller bets and prototypes that are still finding their shape.

How we work

Solo, after-hours, with deliberately low overhead. We ship when something is useful, not when a roadmap says it should ship. Each product is meant to stand on its own and quietly do one thing well — the studio just happens to host several of them at once.

Contact

For partnerships, support, or just to say hello: admin@yuntai.tech.