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Software engineer from São Paulo, living in the Netherlands. Currently building Unify at Bizzdesign.

Dag voor Dag, 2026

Description

Dag voor Dag is a personal Dutch-learning app I designed, built and use myself. It turns a little practice every day ("dag voor dag") into steady progress toward the Inburgering A2 civic-integration exam: spaced-repetition vocabulary, a video-based grammar course, graded reading, exam practice and an AI conversation coach.

Most apps either drill isolated words or stay generic. I wanted one tuned to the exam I'm preparing for, built on authentic material, and calm enough to open every day, wrapped in a hand-made blue-and-white Delftware design.

Credits

Nathan Ribeiro – Design, frontend and backend. Personal project, web + Android. Stack – Angular 21, TypeScript, Capacitor 8, Node.js with Fastify 5, Piper text-to-speech, Claude (Anthropic). Grammar videos: "Nederlands in gang", University of Groningen Language Centre, embedded from YouTube. Library texts are public domain.

The Today dashboard of Dag voor Dag: a daily plan with a minutes goal, streak and words due, a word of the day, and a wall of blue Delft tiles — Today — a daily plan with a minutes goal, streak, words due and a word to take with you. The wall of Delft tiles fills up as sessions are completed.

Grammar exercise: building a Dutch sentence from word tiles placed in numbered slots — "Leg de tegels" — build the sentence from word tiles; the slots show Dutch word order.

A spaced-repetition flashcard showing the Dutch word ver with a glazed-tile frame — Spaced repetition — about 3,000 words on SM-2, with audio and de/het checked before the reveal.

The library reader: a Dutch story with a My words glossary drawer open on the right — Library — public-domain texts with line-by-line translation, text-to-speech and a "My words" glossary.

A little Dutch, every day

Vocabulary

About 3,000 words scheduled with SM-2, plural and diminutive forms, sound feedback

Grammar

30 lessons, one per clip of the Groningen playlist: watch, rule, choose, build the sentence, spot the mistake

Exam

Reading, writing, listening and KNM (Dutch society) practice in the style of the Inburgering A2 exam

A grammar lesson's rule step: separable verbs explained with a table and a row of word tiles — A lesson's rule step — separable verbs as a row of tiles: the verb sits in slot 2, its prefix moves to the very end.

The Today dashboard in the dark theme, with the same Delft tile motifs in deep blue — Dark theme — the same Delftware system, glazed for the evening.

Dag voor Dag on a phone: the Today screen — Android — Today.

Dag voor Dag on a phone: a grammar rule with word tiles — A grammar rule on the phone.

Dag voor Dag on a phone: a review flashcard — Word review.

Built like a product

Frontend

Angular 21 with signals and a custom Delftware design system: glazed-tile cards, Friese-witjes corners, light and dark themes

Mobile & offline

Capacitor 8 Android app that finds the home server on the local network; offline-capable PWA on the web

Backend & AI

Fastify 5, local Piper text-to-speech, Claude behind server-side guardrails, and a KOReader plugin for the Kindle