Open source language tooling and educational resources for Luxembourgish
Mir wëlle bleiwe wat mir sinn — we want to remain what we are
These tools already exist. Use them today.
Check your Luxembourgish spelling online. Maintained by ZLS.
Speech-to-text. Speak Luxembourgish, get a transcript. Free, by ZLS.
Text-to-speech. Type Luxembourgish, hear it spoken. Free, by ZLS.
Official multilingual dictionary. Luxembourgish, French, German, Portuguese, English.
Prepare for the citizenship language exam. Free simulation and practice.
Official language center. Orthography rules, vocabulary books, language resources.
A little Luxembourgish goes a long way.
Moien! 👋
Hello!
Äddi!
Goodbye!
Merci 💛
Thank you!
Wéi geet et?
How are you?
Jo / Nee
Yes / No
Wou ass ...?
Where is ...?
Ech verstinn net. 🤷
I don't understand.
Et geet mir gutt.
I'm doing well.
Äddi merci! 👋
Thanks, bye!
Vill Gléck! 🍀
Good luck!
Schwätzt Dir Lëtzebuergesch? 🇱🇺
Do you speak Luxembourgish?
Wannechgelift / Gär geschitt
Please / You're welcome
Official language center. STT (Whisper) and TTS (VITS2). Maintains spellchecker.lu and the LOD dictionary.
HunSpell orthography checker, transferred to ZLS in 2023. Word list to be released CC0. Spelling only, no grammar.
Official multilingual dictionary with public API. 5 languages. Backbone dataset for ZLS TTS training.
First UD treebank for Luxembourgish (Nov 2024). Uni.lu research, not yet packaged for practical use.
Instruction tuning datasets (Oct 2025). LuxIT: 59'242 monolingual pairs. LuxInstruct: cross-lingual. Mixed fine-tuning results.
GEMMA 3 27B fine-tuned for Luxembourgish to French/English translation (Feb 2026). Proves viable fine-tuning works.
spellchecker.lu only validates orthography. Syntax, agreement, and grammatical structure go completely unchecked. The dative case, verb conjugation, and article agreement have no automated validation.
Teachers have no way to assess whether a text is appropriate for Cycle 1.2 or Cycle 4. No CEFR-aligned readability metric exists for Luxembourgish.
Luxembourg's school system has 4 cycles, but no vocabulary lists are aligned to those levels. Teachers build their own from scratch every year.
Even large models have weak grammatical understanding, especially morphology and syntax. Grammar-Book-Guided Probing (Oct 2025) found LLMs fail at minimal pair detection. Fine-tuning datasets show mixed results.
Tools exist for checking after you write. Nothing helps you write correctly in the first place, with real-time suggestions and grammar explanations.
ZLS tools exist but aren't packaged for classroom use. Teachers need standalone, simple tools that work without API keys, logins, or technical setup.
The Sproochentest is the Luxembourgish language exam required for citizenship. Administered by INLL, it tests oral skills only. About 75€, pass rate is high with preparation.
A grammar checker must catch dative case errors (the most tested grammar point). A readability scorer should align with A2/B1 CEFR levels. Graded word lists should cover the 10 Sproochentest topic categories. Listening practice could use Liesmaschinn TTS. A practice mode could generate photo descriptions and evaluate them. Prepare for the Sproochentest →
Open source, open data, honest tools. 🇱🇺