How is Nail German different from apps like Duolingo or Babbel?

Duolingo and Babbel focus on general casual vocabulary matching. Nail German is an intensive examination drill engine built specifically for the grammar sections of official Goethe-Zertifikat and telc exams. It enforces strict CEFR rules, timed 15-minute mock simulations, and Leitner 3-streak active recall.

Which specific exams and CEFR levels are supported?

The curriculum spans all 6 CEFR levels (A1, A2, B1, B2, C1, C2) calibrated for Goethe-Zertifikat (A1–C2), telc Deutsch (A1–C1 Hochschule), and TestDaF.

Why is the Exam Simulator passing score set to exactly 60%?

Both Goethe-Institut and telc gGmbH officially require a minimum score of 60% (60/100 points or 9/15 items) to award an official language certificate. We match this exact Bestehensgrenze in our 15-minute exam simulator so you know your true test readiness.

Is the €19.99 Lifetime Pass truly a one-time payment with no subscription?

Yes. You pay €19.99 once and unlock permanent lifetime access to all 1,647 verified questions, all 6 CEFR levels (A1 to C2), unlimited exam simulations, and all future question updates with zero recurring charges or hidden fees.

Can I install this on my iPhone, Android, or laptop offline?

Yes! Nail German is built as a Progressive Web App (PWA). Open app.nailgerman.com on Safari or Chrome, tap Add to Home Screen, and the app installs as a full-screen standalone application that saves your local progress and works offline.

How does the 3-Box Ampel Leitner system work?

Every question is tracked individually in local storage. Missed questions drop to Box 1 (Rot) for immediate re-drilling. Questions advance to Box 2 (Gelb) upon 1 correct hit, and are only stamped Box 3 (Grün • Mastered) once you achieve 3 consecutive correct hits across mixed interval drills.

Should I use Nail German alone or alongside my current German course?

Nail German is engineered as the ultimate high-yield examination companion. While structured classroom courses (VHS, Goethe-Institut) and conversation apps provide listening and immersion, Nail German provides the high-frequency active recall drills needed to master examination grammar and clear the strict 60% Bestehensgrenze under timed pressure.

B1–B2 EssentialGoethe B1, Goethe B2, telc Deutsch B2

German Adjective Endings Chart & Declension Rules

German adjective declension follows 3 distinct patterns depending on whether the preceding article already indicates the gender and case.

Mathematical Formula Blueprints

The Golden Rule of Adjective Endings

If the article already signals the gender/case clearly, the adjective takes a weak ending (-e or -en). If not, the adjective must carry the signal ending (-er, -es, -e).

Definite Article (der/die/das)++ Adjective (-e / -en)++ Noun

Example:

"Der alt-e Mann (Nom) | Den alt-en Mann (Akk) | Dem alt-en Mann (Dat)"

Typ 1 Weak Endings: Only -e (Nom Sg & Fem/Neut Akk) or -en (All others)

Core Rules & Sentence Mechanics

The Dative & Genitive Rule: Always "-en"

In the Dative and Genitive cases (both singular and plural), adjectives ALWAYS take the "-en" ending after any article (Typ 1 and Typ 2).

mit dem neuen Auto (Dat), einer netten Kollegin (Dat), des guten Weines (Gen).

Typ 3: Strong Declension (No Article)

When no article precedes the adjective, the adjective itself must carry the definite article endings (except masculine and neuter genitive which takes -en).

kalter Kaffee (der), frische Milch (die), warmes Wasser (das).

Reference Matrix & Master Table

Adjektivdeklination Overview Table (Typ 1, 2, and 3)
Case	Typ 1 (der/die/das)	Typ 2 (ein/eine/kein)	Typ 3 (No Article)
Nom. Masc	der gut-e Mann	ein gut-er Mann	gut-er Wein
Akk. Masc	den gut-en Mann	einen gut-en Mann	gut-en Wein
Dat. Masc	dem gut-en Mann	einem gut-en Mann	gut-em Wein
Nom. Fem	die schön-e Frau	eine schön-e Frau	schön-e Musik
Akk. Fem	die schön-e Frau	eine schön-e Frau	schön-e Musik
Dat. Fem	der schön-en Frau	einer schön-en Frau	schön-er Musik
Nom. Neut	das neu-e Auto	ein neu-es Auto	neu-es Brot
Akk. Neut	das neu-e Auto	ein neu-es Auto	neu-es Brot
Dat. Neut	dem neu-en Auto	einem neu-en Auto	neu-em Brot
Nom. Plural	die neu-en Bücher	keine neu-en Bücher	neu-e Bücher
Dat. Plural	den neu-en Büchern	keinen neu-en Büchern	neu-en Büchern

Official Goethe & telc Exam Traps

The Indefinite Neuter Accusative Trap

Learners often mistakenly write "ein schönes Buch" without the -s ending in the accusative.

COMMON MISTAKE (0 Points)

Ich habe ein schön Buch gekauft. (WRONG)

CORRECT STRUCTURE

Ich habe ein schönes Buch gekauft. (CORRECT)

Examiner Rule: Neuter Nominative & Accusative after "ein" always takes "-es".

Live Interactive Calibration

KNOWLEDGE CHECK

Test Your Understanding

Try these 2 interactive calibration questions for German Adjective Endings Chart & Declension Rules.

Question 1 of 2Adjektivdeklination Dativ

Wir haben gestern mit unserem neu[ ··· ] Nachbarn gesprochen.

Question 2 of 2Starke Adjektivdeklination

Kalt[ ··· ] Wasser ist an heißen Sommertagen besonders erfrischend.

Master this rule permanently

Lock in long-term memory with the 3-Streak Leitner system across all 1,647 CEFR questions.

Launch Interactive Training