Mundocuento
Illustrated stories with a voice, made for bedtime. Twenty tales, three languages and everything downloaded so it works offline.
Get it on Google Play
Real app screenshot
- Role
- Product design, mobile development and publishing
- Category
- Children's reading and audio
- Year
- 2025 — 2026
Six screens, one story
The problem
Families look for quality entertainment for their children, but most kids apps live on ads, purchases and stimulation loops. Noisy interfaces, links that escape, and nothing that works without coverage.
The solution
A closed library of twenty illustrated stories, narrated in European Spanish, Latin American Spanish and English. No ads and no mandatory sign-up. Five stories are free forever, one new story opens every day and the rest unlock with an optional subscription. Every text, illustration and audio file lives on the device, so it works on a plane, in a waiting room or in bed with the screen off.
Built so the app steps aside
Twenty illustrated stories
Originals and classics, each with its own cover, recommended age, duration and illustrated pages.
Narration in three languages
European Spanish, Latin American Spanish and English. The same voice reads the tale and keeps playing with the screen off.
Offline mode
The whole catalogue downloads once and stays available forever. No data, no waiting.
Reading comprehension
Four questions at the end of each story to remember, talk about and check what was understood.
Screen time limits
A configurable daily timer, an optional bedtime reminder and a protected parents area.
No ads, no tracking
Five stories free forever, a different one every day and an optional subscription for the rest. No advertising and no analytics SDK.
How it is built
A native mobile app with a serverless backend and an offline mode that is the foundation, not an extra.
Native app with Expo
A React Native interface on Expo SDK 58 with tab navigation, accessible typography and light and dark themes. Shipped to Google Play with EAS Build.
Cached narration
A Cloud Function prepares each story's audio, stores it and reuses it. The server tracks a monthly character cap so the bill never surprises anyone.
Real offline mode
Stories, illustrations and audio are downloaded and persisted on the device with SQLite and the file system. Progress syncs when the connection returns.
Privacy and parental gate
Anonymous session by default, with no ad SDKs or telemetry. External links, settings and account deletion sit behind a challenge only an adult can solve.
Privacy by design
- ✓Anonymous session by default: the app works without giving any personal data.
- ✓No advertising, no analytics SDK and no selling data to third parties.
- ✓Firestore rules that keep every family inside its own data.
- ✓External links and sensitive settings sit behind a parental gate.
- ✓Full account and data deletion from inside the app, in one step.
Legal
Official product documentation and data management.