About Wonderleaf

Ask Wonderleaf a question. It hands you back a picture book. Not a search result, not a video — a real, warmly illustrated book, made for that exact question by our own software. Wonderleaf is a technology startup: one AI-powered platform, shipped as a web app and an iOS app, that writes, paints, and typesets every page itself. Wonderleaf is not a publisher with a fixed catalogue on a shelf — every book is generated by software we built, then held to a real storybook standard before a reader ever sees it.

What we do. Wonderleaf (wonderleaf.app) turns real questions — Why is the sky blue? How do bees make honey? Where does money come from? — into short, warmly illustrated picture books that are accurate, gentle, and genuinely fun to read: a growing library of more than 2,000 titles, plus brand-new books written and illustrated on demand when a reader asks something the library doesn't cover yet.

The problem we solve. Curious kids ask wonderful questions all day, and the answers within reach are rarely made for them — search results, ads, and videos aren't written for a child on a parent's lap, and even the best picture-book shelf is finite. No publisher can stock an answer to every question at the moment it's asked. Wonderleaf can: it answers with a real picture book, made for that exact question.

Who we build for. Families with curious kids — from toddlers and preschoolers (our Little Wonders mode) to independent young readers — and the curious adults reading right beside them. Reading starts free every day; the Plus plan is for households that want the whole library.

What we offer

• The Library — a growing collection of illustrated question-and-answer books across nature, space, the human body, history, money, machines, and more. Anyone can read a few books free every day, no account required.
• Ask anything — signed-in readers can ask their own question, and Wonderleaf writes and illustrates a brand-new picture book answering it, on demand.
• Little Wonders — a dedicated mode for the littlest readers (toddlers and preschoolers) with simpler words and playful, tap-to-play "living book" pages.
• Read-aloud narration — on the Plus plan, books read themselves aloud with natural narration and gentle page turns.

The product & where we are

Wonderleaf has been live at wonderleaf.app since 2026. It is a real, running product — not a mockup or a pitch. Here is what is built and shipping today:

• The platform — our own generative-AI pipeline writes each book's words, illustrates every page in a consistent watercolour house style, lays it out as a real picture book, and serves it through both the web app and the iOS app.
• The library — more than 2,000 illustrated question-and-answer books, published in English and Korean, spanning nature, space, the human body, history, money, machines, and more.
• Little Wonders — a dedicated toddler and preschool mode, with simpler words and playful, tap-to-play "living book" pages.
• Read-aloud narration — books that read themselves aloud with natural narration and gentle page turns.
• Plus subscription — a $9.99/month plan, live and billed through Stripe, that opens the whole library with no daily read cap, adds read-aloud narration, and includes 12 custom books a month.
• iOS app — a native app built on the same platform; as of July 2026 it is complete and submitted to Apple for App Store review.

A look at the live product — the home page, the reader, Little Wonders, and the app on desktop and phone:

How the books are made

Wonderleaf books are created with modern generative AI, working inside careful editorial guardrails: factual grounding checks, content-safety review, and a house illustration style designed to feel like a real storybook rather than a screen. Custom books are only ever generated when a reader explicitly asks for one.

Plans

Wonderleaf is free to read every day — free readers get Today's Picks, a few library books each day, Little Wonders plays, and one custom book of their own to keep. The Plus subscription ($9.99/month) opens the whole library with no daily read cap, adds read-aloud narration, and includes 12 custom books a month.

Who's behind Wonderleaf

Wonderleaf was founded in 2026 by Hyungnun Kim, and is run today by Kim as its solo founder. Kim designs and directs the product end to end — the house illustration style, the editorial standard every book must meet, the reader experience on both web and iOS, and the AI pipeline that ties them together. Every part of Wonderleaf that a family sees has been shaped by one person's conviction about what a family-friendly explainer should feel like.

Before Wonderleaf, Kim spent five and a half years building AI and data systems for semiconductor manufacturing — production engineering applications, data-trust infrastructure, and agentic AI over factory datasets measured in hundreds of terabytes. Kim holds a PhD in mechanical engineering from the Georgia Institute of Technology.

Company facts

Questions, press, or partnerships: hyung@wonderleaf.app.