Writing professional emails in German is notoriously tricky — the formal "Sie" form, the correct greetings, and avoiding Anglicisms all matter more than English speakers expect.
In 2026, several free AI tools handle German business emails surprisingly well. Here's what actually works:
Claude (Free tier) delivers the most natural German writing of any model I've tested. It correctly handles the formal Sie form, produces proper greetings like "Mit freundlichen Grüßen" without prompting, and avoids the stiff machine-translation feel.
ChatGPT Free (GPT-5.5 Instant) is now the default on the free tier since May 2026 and handles German formality well — especially useful for response emails where you paste in the thread.
Mistral Le Chat is the EU-hosted option: servers in France, no monthly limit on the free tier, and clean German output that works well for formal authority correspondence.
Neuroflash is worth knowing if you write marketing emails in German — it's the only model specifically trained on German marketing copy and generates three subject line variants automatically.
For a full German-language comparison with GDPR notes and concrete prompt templates for common situations (customer inquiries, first payment reminders, polite rejections), see this comparison on KI Tools DE.
The short version: use Claude for formal and application emails, ChatGPT for everyday reply drafts, Mistral when GDPR compliance matters.
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