Speaking
A monologue or a dialogue on your own topic or a suggested one. Your words appear as you speak, then you get feedback: your mistakes explained, and an improved version at the level you choose.
German grammar trainer · A1 to C1
Speak and write German. Learn from every mistake.
Satzprofi corrects every sentence you write or say and tells you exactly why: word order, der / die / das, cases, tenses. Then it gives you new practice on the grammar you got wrong.
Nicht ganz
You wrote
Ich weiß nicht, ob er kommt morgen.
Corrected
Ich weiß nicht, ob er morgen kommt.
Why: after ob, the conjugated verb moves to the end of the clause.
What's inside
Six ways to practise German grammar
Choose your level and the grammar you want to train. Every exercise is new, and every answer gets feedback.
Grammar drills
Build sentences from base forms, fill in the missing endings and articles in a text, or check sentences you write yourself. Every answer comes with the rule behind it.
Vocabulary
Train article, word and plural together, explain words in German, or bring your own word lists: read example sentences, complete them, or write your own.
Writing
Pick an essay topic at your level, write, and get every mistake marked with a correction and an explanation you can actually learn from.
Progress
A progress bar for every grammar topic, and a "For you" mode with extra practice on the grammar topics you got wrong.
Saved items
Save corrections, words and sentences while you practise, and review them when your session is done.
Pricing
Less than one tutoring lesson a month.
A private tutor costs about €25–40 per hour. Premium costs €19.99 a month for daily practice with feedback. Start free, no card needed.
Free
€0
Try it properly, no card needed
- ✓15 ready-made sentences and 3 gap texts a day
- ✓Every level from A1 to C1, placement and level checks
- ✓Weekly review of your progress
- ✓Your progress saved on every device
- ✕AI checks of your own answers
- ✕Speaking and writing feedback
- ✕Cheat sheet to download and print
Most popular
Premium
€19.99/ month
Daily AI feedback for regular study
- ✓No daily exercise limit
- ✓Daily AI feedback for regular study (fair use)
- ✓AI checks of your own answers and of any sentence
- ✓Speaking and conversation practice with feedback
- ✓Writing feedback on texts up to 300 words
- ✓Weekly review with an AI tip
- ✓Cheat sheet to download and print
- ✕Exam-style writing practice
- ✕Priority support
Intensive
€49.99/ month
For exam preparation and heavy daily use
- ✓Everything in Premium
- ✓2.5× more daily AI, for intensive study and exam preparation
- ✓Writing feedback on texts up to 600 words
- ✓Exam-style writing practice (Goethe, telc, ÖSD format) with practice scores
- ✓Priority support: an answer within 24 hours
Secure checkout by Suby. 14-day money-back guarantee on your first payment. Cancel any time; you keep access until the end of the period you paid for. Daily AI limits are explained in the questions below.
der · die · das
Endings and articles, in real texts
Gender and case are where most learners get stuck. Satzprofi gives you short, sensible texts with gaps, a clue under each gap, and colour for every gender.
- Akkusativ, Dativ and Genitiv, with and without prepositions
- Adjective endings after der, ein and no article
- Texts stay in one tense, like real German
Am Samstag gehe ich mit meiner Schwester in den Park. Wir setzen uns auf eine Bank unter einem alten Baum und essen das Brot aus der Bäckerei.
Clues under each gap tell you what's being asked: case, gender, or ending.
der · masculinedie · femininedas · neuter
Grammar topics
27 topics, from word order to Konjunktiv
Train one topic or mix several, sorted into folders like a real grammar book. Each topic appears from the level where it belongs.
Sentence building
Satzbau & NebensätzeWord ordernicht or keindass · weil · ob · trotzdemIndirect questionsRelative clauseszu + infinitiveTwo-part connectors
Tenses
ZeitenPräsensPerfektPräteritumPlusquamperfektFutur I
Verbs
VerbenSeparable verbsImperativePassive
Nouns & cases
Nomen & FälleGender & articlesPluralAkkusativ & DativAdjective endingsComparisonGenitiv
Prepositions
PräpositionenVerbs + prepositionsPlaces: in · an · auf · zu · nachTime: am · um · im · seit · vorTwo-way prepositions
Konjunktiv
wishes, politeness, reported speechKonjunktiv IIIndirect speech (Konjunktiv I)
Not ready for relative clauses, the passive or Konjunktiv yet? Switch them off, and they won't appear in your exercises.
How it works
Start in two minutes
Create your account
With Google or your email. Your progress is saved to your account on every device.
Subscribe
One monthly plan with everything included. Cancel any time in your account.
Practise your way
Pick your level and topics, then speak, write or drill. Topics you often get wrong come up more often in your practice.
Questions
Frequently asked
What level do I need?
Any level from A1 (beginner) to C1 (advanced). You choose your level, and exercises, texts and corrections are written for it. You can change it any time.
Do I need to install anything?
No. Satzprofi runs in your browser on phone, tablet and computer. For speaking practice, use a browser with speech recognition, such as Chrome, Edge or Safari.
How good are the corrections?
Corrections come from an AI language model (Google Gemini) set up to check carefully and explain each change. It's very reliable on everyday grammar but not perfect. If you think a correction is wrong, you can mark it with "I think this was correct".
Is there a daily limit?
The free plan includes 15 ready-made sentences and 3 gap texts a day, without AI. Premium includes up to 80 AI actions a day and Intensive up to 200: checking a sentence counts as one, a new gap text as two, and feedback on a text as one per started 100 words. Most learners use far less. Library and built-in exercises never count, so on the paid plans you can keep practising after your AI is used up. Premium checks texts of up to 300 words, Intensive up to 600.
How do I pay?
Payment is handled on Suby's secure checkout page. We never see or store your card or wallet details.
Can I cancel?
Yes, any time, in the app under Account → Cancel subscription. You keep access until the end of the period you've already paid for. Not happy? You get a full refund within 14 days of your first payment; see the Refund Policy.
What happens to my data?
Your account and progress are stored securely, and only you can see them. The sentences you submit are sent to the AI to be corrected. You can delete your account and all your data in the app at any time. Details are in the privacy policy.
How can I contact you?
Write to appsatzbau@gmail.com.
Your next German sentence, corrected.
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