EasyDutchNews is built on top of several open and commercially-licensed language resources. This page credits every data source, model, service, and major library we depend on.

Dutch language data

dutchdict

Offline Dutch dictionary (~142,000 entries) used for grammar facts — auxiliaries, separable prefixes, reflexivity, plural forms, de/het articles.

• Primary source: Dutch Wiktionary — nl.wiktionary.org (CC BY-SA 4.0 and GFDL)
• Extraction tooling: wiktextract by Tatu Ylonen
• Distribution: kaikki.org/wiktextract
• License: CC BY-SA 4.0

CHN N-grams Commercieel (v1.0, 2019)

Frequency data for 1/2/3-grams over the Corpus Hedendaags Nederlands — approximately 3 billion words of contemporary Dutch from newspapers, magazines, books, blogs, legal material, and news broadcasts. Powers the collocation evidence behind our AI-tips.

• Provider: Instituut voor de Nederlandse Taal (IVDNT), Leiden, Netherlands
• Licensed under a signed commercial agreement with IVDNT
• Citation: CHN N-grams Commercieel (Version 1.0) (2019) [Data set]. Available at the Dutch Language Institute: hdl.handle.net/10032/tm-a2-p7

Open Dutch WordNet (ODWN)

Lexical semantic network for Dutch (117,914 synsets), used for sense identification.

• Source: github.com/cltl/OpenDutchWordnet (CLTL, VU Amsterdam)
• License: CC BY-SA 4.0
• Citation: Postma, M., van Miltenburg, E., Segers, R., Schoen, A. and Vossen, P. (2016). Open Dutch WordNet. Proceedings of the Eighth Global Wordnet Conference, Bucharest.

AI & language models

• OpenAI API (GPT-4.1 and GPT-5 model families) — word-sense disambiguation, tip generation, gloss translation, reading-level generation
• Google Gemini — Dutch text-to-speech for audio playback

Images

• Pixabay — vocabulary-card illustrations (Pixabay License)
• Unsplash — hero imagery (Unsplash License)

Infrastructure

• Google Cloud Platform — Cloud Run hosting, Cloud Storage, OAuth, Text-to-Speech
• Vercel — frontend hosting
• Cloudflare — DNS
• Resend — transactional email
• Stripe — payment processing
• YouTube Data API — automated video uploads for our lesson channel

Open-source libraries

A non-exhaustive list of the major open-source projects we depend on.

Go backend

• pgx — PostgreSQL driver
• openai-go — OpenAI SDK
• go-fsrs — spaced-repetition scheduling for flashcards
• goose — database migrations
• gofeed — RSS feed parsing
• resend-go — email delivery

Frontend

• Next.js and React
• Material UI
• i18next — translation framework

Chrome extension (ClickDutch)

• WXT — extension framework
• Preact — UI library

Compliance notes

The IVDNT signed commercial agreement is the operative legal text for CHN. We distill the n-gram data into per-lemma collocation patterns; the raw tables are never shipped in our product, as required by the agreement. Derivatives of CC BY-SA sources (Dutch Wiktionary, Open Dutch WordNet) are distilled — not redistributed — and credited here.

If you believe a resource is missing from this list or inaccurately credited, please email info@easydutchnews.com and we will correct it promptly.

Last updated: April 2026