A1 Trainer (Netzwerk neu A1)

One self-contained web page with four parts:

• Quiz – ~11,000 questions: 31 grammar topics (all 12 chapters) plus article, meaning and plural questions for every dictionary noun. „Weiter lernen“ is adaptive: new material in course order (a topic counts as solid after ~20 questions at 80%+), misses come back 3–5 questions later, known questions come back as spaced reviews (5 min → 1 → 3 → 7 → 16 → 35 days). Progress is saved after every answer and a reload resumes on the same question. Every question stores the correct sentence split into labelled parts (Subjekt, Verb · Pos. 2, Akkusativ, …), a rule, and an explanation for every wrong option.
• Listening, writing, speaking – listening questions use the browser's German voice; tick „Writing practice“ to type answers to gap questions; after every answer „Hear it“ reads the sentence and „Say it“ checks your pronunciation (speech recognition: Chrome/Edge/Safari).
• Fehler – your saved mistakes (account storage when opened in Claude, otherwise the browser).
• Wörterbuch – 2,622 frequent nouns with article, plural, meaning and the reason for the article, plus an article quiz.
• Grammatik – every topic's lesson, your accuracy, and per-topic practice.

Build

python3 build.py        # -> dist/a1-trainer.html (+ dist/index.html), dist/questions.json

No dependencies beyond Python 3.

Layout

data/dictionary.json   nouns: n=noun a=article e=english p=plural r=reason x=note t=topic
gen/topics.py          topics (course order), lessons, structure labels
gen/verbs.py           A1 verbs + conjugation / imperative helpers
gen/nouns.py           curated A1 nouns used in sentence templates
gen/generators.py      template generators (verbs, articles, Akkusativ, Dativ, Perfekt …)
gen/more.py            wider generators (time, dates, numbers, pronouns, Wechselpräp., …) + vocabulary topics
gen/manual.py          hand-written questions (W-questions, connectors, everyday phrases …)
gen/manual2.py         more hand-written questions
gen/manual3.py         Akkusativ prepositions, comparison, countries, Dativ possessives, doch …
gen/wordlist.py        A1 verbs, adjectives and small words (meaning, opposite)
gen/core.py            question format + helpers
web/template.html      the app (vanilla JS, no build step)

Adding questions

Hand-written questions use a tiny spec: segments separated by /, each text#LABEL, and {…} marks the gap. Options list the correct answer first; why explains wrong options.

add("akk", "Ich#S / kaufe#V / {einen} Apfel.#AKK", ["einen", "ein", "einem"],
    "der Apfel → einen Apfel (Akkusativ).",
    {"ein": "ein is Nominativ.", "einem": "einem is Dativ."})

Labels: S, V, V1, IMP, MV, HV, INF, P2, PRE, AKK, DAT, NOM, ZEIT, ORT, W, ADJ, KON, NEG, ADV.

Saved data (when opened in Claude)

Collection data/users/<you> (or localStorage a1trainer-v1 in a plain browser): q_<id> quiz mistakes, a_<hash> article mistakes, stats, p_<topic> per-question progress {qid: [box, dueMinute, seen, right, lastMinute]}, and meta (answers per day, the question currently on screen). Each mistake keeps the prompt, your answers, the correct answer, the rule, how often you got it wrong, and whether it's learned (2 right answers in a row).

Dictionary sources: Wiktionary (via kaikki.org, CC BY-SA) for gender/plural/meaning, OpenSubtitles frequency list (hermitdave/FrequencyWords) and the Leipzig Corpora word list for ranking. Article reasons are computed from suffix/compound rules and hand-checked for A1 words.