“From idea to app store in 4 weeks. 300k+ personalised stories generated by the AI agent.”

Background

StoryWonder is a mobile app for children that generates personalised, audio-illustrated stories using AI. Founded by Rolf Kosakowski — also owner of KB&B Family Marketing, a marketing agency for the kids segment — it targets European families and counts Playmobil among its strategic partners for cross-brand integrations.

The concept is simple and powerful: the parent (or child together with the parent) chooses the main character, setting, theme, and story length. The AI agent then generates an original, narrated, and illustrated story — fully personalised, in real time.

The Real Problem

Rolf had the product vision and the go-to-market plan. What he needed was a mobile team to bring it to life, and fast. Building an in-house team meant:

• Hiring senior mobile developers (2–3 months of recruiting)
• Choosing a stack (iOS native, Android native, React Native, Flutter)
• Building CI/CD pipelines for two app stores
• Integrating auth, storage, payments, and push notifications
• Building the backbone of the AI story-generation agent
• Managing Apple/Google submission and review cycles

Meanwhile, the kids EdTech market moves quickly: every month of delay is ground lost to American competitors already live.

What the AI Agent Did

Soraia took StoryWonder from zero to both app stores in 4 weeks, with the following architecture:

1. Native cross-platform app in FlutterFlow covering iOS + Android from a single codebase
2. AI story-generation agent embedded in the app: takes character, setting, theme, child’s age, and desired length as inputs; generates text + a coherent image sequence + audio narration
3. Coin/payment system: children “spend” coins to generate a story; parents purchase coins via Stripe in-app
4. Firebase backend for auth, family profiles, generated story library, and push notifications
5. Direct release on the Apple App Store and Google Play, including review cycle management and a hotfix pipeline

The agent’s prompt engineering is the most critical layer: ensuring stories are age-appropriate, narratively coherent, available in multiple languages, and bound by strict limits on sensitive content. Soraia built a pre/post-generation filter system that blocks unsuitable content before it ever reaches the child.

Results

Live on the Apple App Store and Google Play in 4 weeks from kick-off.

50,000+ registered users (growing — figure as of end of 2025).

300,000+ stories generated by the AI agent since launch — every story unique, never seen before.

Lighthouse project for Playmobil: the StoryWonder + Playmobil integration became the blueprint for future brand → kids content partnerships.

Try the product live: story-wonder.com.