Language Differences in the DACH Region: Austrianisms, Helvetisms and Keyword Research

Why linguistic variants in the DACH region determine visibility

Anyone publishing content for Austria or Switzerland often fails due to an invisible detail: word choice. A text written in Germany about "Tomaten", "Aprikosen", and "Kartoffeln" encounters people in Austria who search for Paradeiser, Marillen, and Erdäpfeln. This isn't a question of dialect or slang. It's about standard language that differs from country to country, and precisely these differences determine whether a page matches the search query.

The market potential is real: At the beginning of 2025, 8.69 million people used the internet in Austria with a penetration of 95.3 percent, in Switzerland 8.86 million at 99.0 percent. On January 1, 2025, Austria counted 9,198,214 inhabitants, just under 9.2 million. Google clearly dominates these markets: In Austria, Google holds 81.87 percent market share in May 2026, Bing 9.01 percent, in Switzerland 81.57 percent versus 10.16 percent for Bing. Anyone wanting to rank on Google.at and Google.ch must use the terms searched there.

Trust is another factor. According to an international study by CSA Research with 8,709 consumers in 29 countries, 76 percent prefer products with information in their native language, and 40 percent never buy from websites in a foreign language. This study has no specific DACH focus, but the principle applies analogously to regional language variants: An Austrian who reads "Erdäpfel" feels properly addressed.

Pluricentric German: standard variants, not dialect

German is a pluricentric language. This means: there isn't one correct standard form, but several equally valid national varieties. Austriacisms and Helvetisms are therefore not colloquial deviations from "proper" German, but components of the respective standard language. The Variantenwörterbuch des Deutschen systematically documents these national and regional differences. For SEO practice, a central point follows: An Austrian user who types "Jänner" isn't using slang but their standard German. A page containing only "Januar" may semantically miss the search intent.

This distinction is important because it changes the attitude toward localization. The goal is the correct national standard variant, not a regionally tinted text.

Concrete keyword examples: AT vs. DE vs. CH

The following term pairs show where the same thing is searched differently by country. Actual search volumes must be collected per region with a keyword tool (see next section), as distribution depends heavily on the term.

• Paradeiser vs. Tomate: In Austria, Paradeiser is common; in Germany and Switzerland, Tomate. Both terms should be checked in an AT market, as Tomate is also understood in Austria.
• Marille vs. Aprikose: Marille is the Austrian standard form, Aprikose the German and Swiss.
• Erdäpfel vs. Kartoffel: Erdäpfel is widespread in Austria, Kartoffel is also commonly used pan-regionally. Parallel volume checking is particularly worthwhile here.
• Sackerl vs. Tüte: Sackerl (AT) versus Tüte (DE). In Switzerland, "Sack" or "Tasche" dominates.
• Jänner vs. Januar: Jänner is standard in Austria, Januar in Germany. Relevant for seasonal and date-related content.
• Spital vs. Krankenhaus: Spital is common in Austria and Switzerland, Krankenhaus in Germany.

It's important to recognize that volume ratios aren't symmetrical. Some Austriacisms are searched less frequently than the pan-regional variant despite their standard status, because users type pragmatically in the search box. Therefore, don't blindly replace the German term, but research both.

Tooling for regional keyword research

Regional research stands or falls with the right filters. Three tools form the core:

• Google Keyword Planner: Set location and language filters. For Austria, select location "Austria" and, if applicable, language German. This shows volume for Google.at instead of the entire DACH region.
• Ahrefs and Semrush: Both offer separate country databases (AT, DE, CH). The same keyword shows different values per country. A comparison of "Paradeiser" in the AT and DE databases makes the regional shift visible.
• Google Trends with region comparison: Trends shows relative popularity, not absolute volume. Comparing two terms with filter set to Austria answers which term is preferred in the country, even without absolute numbers.

The practical recommendation is to cross-check each term in at least two tools. Keyword Planner delivers Google's own volume data, Ahrefs or Semrush add difficulty and SERP context, Google Trends decides preference for close term pairs.

Helvetisms in detail

Switzerland has two SEO-relevant peculiarities. First, orthography: Swiss High German has no ß; "ss" is used throughout. "Straße" becomes "Strasse", "Fußball" becomes "Fussball". Since Google generally doesn't strictly separate searches by ß/ss spelling, this is primarily a question of content authenticity and readability, not necessarily a ranking lever. However, a German page with ß immediately feels foreign to Swiss users.

Second, vocabulary:

• Natel vs. Handy: Natel is the Swiss term for mobile phone.
• Velo vs. Fahrrad: Velo is standard in Switzerland, Fahrrad is rarely searched.
• Billett vs. Ticket: Billett (also Billet) is the Swiss form for ticket or admission ticket.
• Kondukteur vs. Schaffner: Kondukteur designates train staff.

For the Swiss market, this means: Anyone optimizing "Fahrrad mieten Zürich" potentially misses those users entering "Velo mieten Zürich". Helvetism research therefore belongs alongside Austriacism research as an equal priority.

EU legal equivalence and lexicographic special status

Austrian standard terms even have legal status in some cases. In Protocol No. 10 of the EU Accession Treaty (accession 1995), Austria secured contractual recognition for 23 selected Austria-specific culinary terms. Under Art. 1 of the protocol, they have the same status and legal effect within the EU as their counterparts used in Germany. This underscores the official status of terms such as Erdäpfel, Topfen, Paradeiser or Marillen, which are explicitly listed in the annex to the protocol.

The Österreichisches Wörterbuch serves as the lexicographic authority source for Austrian Standard German. For glossary creation in the SEO process, the Österreichisches Wörterbuch and the Variantenwörterbuch des Deutschen are the reliable references, not gut feeling.

Best practices: localization and technical implementation

Localize instead of translate. Simply copying German content for AT and CH underperforms because more than just individual words differ. What needs adapting: word choice (Paradeiser instead of Tomate), tone of address and tonality, units and currency (Euro in AT, Francs in CH), as well as cultural references. A German holiday reference or German authority designation doesn't carry weight in Austria.

Mark up hreflang cleanly. For linguistically close variants, hreflang is the central signal against confusion. Google requires the format of language code in ISO 639-1 plus optional region code in ISO 3166-1 Alpha 2, such as de-ch. For the DACH region, this means de-DE, de-AT, and de-CH plus an x-default. Each variant references all others and itself via hreflang.

Avoid duplicate content. Three German-language versions inevitably resemble each other. hreflang helps Google show the right URL per country, but it does not prevent duplicates: Google explicitly counts region variants with essentially the same content in the same language as duplicates. It clusters such pages and picks one of them as canonical. Each version should therefore carry genuine regional substance: terms, examples, and references of the respective country.

Choose URL structure. Three options are available: ccTLD (example.at), subdirectory (example.com/at/), or subdomain (at.example.com). The ccTLD sends the strongest geographic signal and often enjoys more local trust, but is complex in setup and maintenance. The subdirectory consolidates domain authority on one domain and is the pragmatic middle ground for most DACH setups. Subdomains lie in between.

Local SEO in the DACH region

Beyond word choice, SERPs differ noticeably between google.at and google.de, especially with local search intent. According to an international metric cited by HubSpot, around 46 percent of all Google searches aim for local information; this number is global and not Austria-specific, but illustrates the importance of local results. For DACH, this means concretely:

• Maintain Google Business Profile per location: With country-appropriate language in description and categories.
• Serve local search intent: Location-related terms in the respective variant (Velo mieten Zürich, Erdäpfel kaufen Wien).
• Check regional SERP differences: Track rankings on google.at separately from DE rankings, as the same page can be positioned differently by country.

Common mistakes

• Copy-pasting German content: The most common mistake. It costs both relevance and trust.
• Blindly replacing terms: Anyone replacing "Kartoffel" everywhere with "Erdäpfel" ignores that Austrians also often search the pan-regional form. Check both, then weight.
• hreflang without back-reference: Annotations must be mutual. One-sided or missing self-reference renders the signal ineffective.
• ß in Swiss content: Immediately undermines authenticity, even if it's rarely a direct ranking factor.
• Assuming a combined DACH volume: Volume must be collected per country. An aggregated number obscures regional preference.

Metrics and measurement

The success of regional localization is measured per country, not aggregated. Relevant metrics:

• Rankings per search engine domain: Track positions on google.at and google.ch separately from google.de.
• Organic traffic by country: Segment by country in Google Search Console and observe development per variant.
• Impressions per keyword variant: Compare whether the Austriacism version gains impressions after it was introduced.
• hreflang status: Check Search Console for errors and missing back-references.
• Conversion and repeat purchase by region: Since language preference influences buying behavior (see CSA Research), comparing conversion rate before and after localization is worthwhile.

Further reading: practical workflow

A repeatable process makes regional optimization systematic:

1. Create keyword map: Collect target terms and note the DE, AT, and CH variant for each term.
2. Collect volume per region: Check each variant in Keyword Planner with location filter as well as in the respective Ahrefs or Semrush country database; decide close pairs via Google Trends.
3. Create glossary: A maintained Austriacism and Helvetism glossary, based on Österreichisches Wörterbuch and Variantenwörterbuch, as binding editorial reference.
4. Localize content: Adapt word choice, tone of address, units, currency, and cultural references per country, not just translate.
5. Implement technology: Set hreflang for de-DE, de-AT, de-CH, and x-default; define URL structure; check duplicate content signals.
6. Measure and adjust: Monitor rankings, traffic, and conversion per country and expand the glossary with new insights.

This turns linguistic correctness into a measurable SEO advantage: content that readers in Austria and Switzerland recognize as their own.