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Why Ludwig Search
300M sentences from verified sources
Only the best of the web
Our database includes 300M example sentences from academic papers, The New Yorker, The Guardian, The New York Times and several other major publications —not random internet text. Every example comes from a trusted source you can rely on.
The imitation game
The human learning method
Humans learn linguistic skills by imitating usage patterns. Ludwig shows you real-world examples so you can understand not just if something is correct, but how it's actually used by native writers.
Get both algorithmic insight and human proof
AI + Context = Better decisions
AI tells you what might work. Real examples show you what definitely works. Together, they give you the confidence to choose the right words every time.
How to use Ludwig Search
Step 1
Enter your sentence or expression:
Write or paste your best guess and click "Go*".
Pro tip: Break down complex sentences into smaller pieces to find the most helpful examples for your specific doubt.
Step 2
Read the AI analysis and observe how your phrase:
—or similar ones—appears in reliable English sources. See if your words align with your intended meaning.
Step 3
See AI feedback plus real-world examples:
If it's written in The New Yorker and makes sense in that context, you can confidently use the same expression in your paper.
Additional features
Search in any language
Start in your native language, get English examples: Search directly in Chinese, Japanese, Spanish, German—any language (100+ languages). Get contextualized machine translations with real examples that help you verify if the translation fits your specific context, avoiding the literal nonsense of generic translators.
British or American English?
Customize the English variant: Switch Ludwig to UK English, US English or Standard English (which includes all English variants)
Create your Library
Find examples from your own field: Upload your own documents and use them as a source for your next writing
Search filters
Find examples from a specific language domain: Use filters to search within specific domains (academic, business, technical) or exclude certain sources.
Native desktop power, universal integration
Get the Ludwig experience without switching tabs, by downloading the desktop app. It works perfectly with all your favorite writing apps, too!
Download desktop app
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Why you should go Ludwig Premium
Free
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Limited number of searches per day
For occasional consultation
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Limited examples per search
Good representation of occurrences
Premium
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Unlimited* searches per day
For the writers
✓
Maximum number of examples
Complete representation of occurrencers
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Search filters
Perfect to find examples in your field
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Library
Add and search your own personal sources
*Unlimited access is subject to abuse guardrails.
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Trusted by 2 million users worldwide
Ludwig is by far the best website to check your language to find examples in prominent papers. I am a language teacher and an author, and with the help of Ludwig, I can ensure what I'm teaching is authentic and, more importantly, reliable!
IELTS Go pro
I have been very pleased with Ludwig.guru application from the start, it definitely helped me both in academic and professional environments. I would absolutely recommend Ludwig.guru to anyone who wants to achieve that next level of writing style, seek to improve one's writing skills and/or enhance one's writing ability.
Pete
The app service is practical and very intuitive. It has greatly helped me during the writing of my scientific articles and even long my phD thesis. Thanks to Ludwig, I fixed some style mistakes, and it provided me with several good suggestions. I recommend it!
Alessandro
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Frequently Asked Questions
How does Ludwig Search work?
Ludwig Search queries a database of 300M sentences from reliable English sources including academic papers, major publications like The New Yorker, scientific journals, and trusted news outlets. When you search for an expression, our AI analyzes your query and retrieves the most relevant examples showing how that language is actually used in context. This combination of AI insight and real-world proof helps you make confident writing decisions.
What sources does Ludwig use?
Ludwig's database includes sentences from academic publications, peer-reviewed journals, major newspapers (The New York Times, The Guardian), magazines (The New Yorker, The Atlantic), scientific literature, and other verified sources. We specifically exclude unreliable sources like random blogs or machine-translated websites to ensure every example you see comes from professional writers.
Can I search in languages other than English?
Yes! You can search in any language and Ludwig will provide contextualized machine translations into English along with real usage examples. This helps you verify whether the translation fits your specific context or is too literal. It's particularly useful for avoiding the common errors of generic translation tools that draw from unreliable multilingual sources.
How is Ludwig Search different from AI writing tools?
Most AI tools only tell you what "sounds right" based on patterns in their training data. Ludwig shows you how expressions are actually used by professional writers in verified publications. You get both AI analysis AND proof from real sources, giving you the confidence to make informed decisions rather than blindly trusting AI suggestions.
What's the difference between Free and Premium?
Free gives you 5 searches per day—perfect for occasional verification. Premium offers unlimited searches, advanced filters to search within specific domains or sources, and the ability to upload your own documents as reference sources. Premium is ideal for writers who need constant access to verified examples throughout their writing process.
How does the Desktop App work?
The Ludwig Desktop App integrates directly with your writing workflow. Once installed, you can launch searches from any application (Word, Google Docs, email, etc.) using a keyboard shortcut—no need to switch tabs or copy-paste into a browser. It's the fastest way to verify language while you write.
Can I use Ludwig for academic writing?
Absolutely. Ludwig was built with academic writers in mind. Our database includes millions of sentences from peer-reviewed journals and academic publications. Many PhD students, researchers, and professors use Ludwig to verify that their language matches the conventions of academic English in their specific field.
Is my search data private?
Yes. Ludwig follows European data protection standards with servers located in Italy, Germany and France. Your searches and personal data are never sold to third parties or used for advertising. We believe in data sovereignty and maintaining your privacy while you write.
What does "Unlimited" usage mean?
Premium users can use Ludwig AI Chat without limitations. There are some guardrails in place to prevent abuses and to allow all users access the service effectively. Usage must adhere to our Terms of Use, which prohibits, among other things:
• Abusive usage, such as automatically or programmatically extracting data.
• Sharing your account credentials or making your account available to anyone else.
• Reselling access or using Ludwig Premium to power third-party services.
To prevent misuse, we have guardrails in place and are always working to improve our systems. This may occasionally involve a temporary restriction on your usage. We will inform you when this happens, and if you think this might be a mistake, please don't hesitate to reach out to our support team at support@ludwig.guru from the support button in the menu. If policy-violating behavior is not found, your access will be restored.