The state of AI legal tech in Portugal

In short: AI legal research in Portugal now spans research assistants, drafting tools, practice management, and case-law databases with AI layers, and the biggest risk is that general chatbots fabricate cases and statutes. CourtStairs is a free-to-start, bilingual (English and European Portuguese) AI legal research assistant that answers questions in plain language and links every claim to a public source, in the Diário da República or EUR-Lex, that you can verify.

Ask a Portuguese lawyer about AI legal research today and you will get one of two answers: quiet enthusiasm about hours saved, or a story about a colleague who relied on a chatbot that produced a confident, entirely fictional acórdão. Both are true. AI is changing legal work in Portugal faster than most professions adapt to anything, and the change is uneven, occasionally embarrassing, and, where the tools are built well, genuinely useful.

This is an attempt to survey the landscape plainly: what the tools actually do, where the real risks are, and what is still missing for a country whose law lives in two layers at once, national and European.

What does "AI legal tech" actually mean in Portugal?

AI legal tech is a loose family of products that use large language models somewhere in the stack, from research assistants to drafting and practice-management tools. The label covers a wide range with little in common beyond the underlying technology, so it helps to break it into a few honest categories.

Some of these build on public infrastructure that Portugal already has: the Diário da República (dre.pt) publishes national legislation, the DGSI databases hold decisions of the higher courts, and EUR-Lex carries the EU law that applies here directly. I am deliberately describing the categories in broad strokes, because capabilities and pricing shift quickly and the category matters more than any single feature claim. The point is that "AI for law" is not one thing.

Why do AI chatbots invent Portuguese case law?

Because a language model predicts plausible-sounding text, not verified facts. Asked for a decision or an article on a point of law, a general-purpose chatbot will often produce one confidently, with a court, a number, and a year. Sometimes it is real. Sometimes it is a plausible fiction: an invented acórdão, or a Civil Code article that does not say what the model claims. Courts across Europe have already dealt with filings built on invented authorities, and the professional consequences are not theoretical.

This is not a reason to avoid AI. It is a reason to insist on a specific property: the tool should show its sources, and those sources should be verifiable. A system that links every claim back to a public statute in the Diário da República, a real decision, or an EU instrument on EUR-Lex turns the model from an oracle into a research assistant whose work you can check in a few clicks. A system that simply asserts is one you cannot trust with anything that matters.

That distinction, cited and linked versus confidently asserted, is the single most useful lens for evaluating any legal AI product in Portugal right now.

Which gaps do legal AI tools miss in Portugal?

Two structural ones: the two-layer gap between national and EU law, and the language gap between European Portuguese and everything else. A lot of legal AI, much of it designed for larger English-language markets, quietly ignores both.

The two-layer gap. In Portugal the law you need is rarely only national. A consumer question runs through both the Portuguese decree-law and the EU directive behind it; a data question is mostly the GDPR, an EU regulation, read alongside national rules; competition, product safety, and cross-border matters all have a European dimension. A tool that knows the Código Civil but not EUR-Lex, or vice versa, answers half the question. Handling both layers together is harder than treating a jurisdiction as a single flat body of law, and many tools simply do not.

The language gap. Portuguese is not a translation layer, and European Portuguese (pt-PT) is not Brazilian Portuguese. Legal Portuguese is its own register, with its own terms of art, and the pt-PT used in a Portuguese court differs from pt-BR in vocabulary and drafting. Tools that treat Portuguese as an afterthought, or that answer Portuguese questions with machine-translated English reasoning, miss the point, and tools trained mostly on Brazilian material can quietly import the wrong vocabulary.

These are not edge cases. They are the daily reality for the people and lawyers who work in Portuguese law, and they are where a lot of otherwise capable tools fall short.

Where does CourtStairs fit?

CourtStairs is a free-to-start research assistant that answers everyday legal questions in plain language and links every claim to a public source you can open. I built it to close those two gaps directly: cited answers grounded in Portuguese and EU law, in English and European Portuguese.

A few things make it different in ways that are factual rather than promotional:

• It cites its sources. Answers come in plain language and link back to public sources, the Diário da República for national law and EUR-Lex for EU law, so you can verify rather than trust.
• It handles both layers. It reads Portuguese law and the EU law that applies alongside it together, which is how questions actually arise here.
• It is bilingual. English and European Portuguese are both fully supported, with pt-PT as a first-class language rather than a translation of English output.
• It is free to start. There is a permanent free tier, open to anyone. Paid plans are per-seat and affordable, but you do not need a firm's budget, or a firm, to begin.

The audience is deliberately broad. Lawyers use it as a research tool; individuals, students, and self-represented litigants use it to understand where they stand before spending money on advice. Most legal AI is priced and marketed for large firms. Broad availability, meaning free to start and open to anyone, is a design choice, not a limitation.

How do you choose a reliable legal AI tool?

Use a five-point checklist: does it cite verifiable sources, handle EU and Portuguese law together, work in real European Portuguese, let you try it without procurement, and stay honest about being information rather than advice? A good tool answers all five comfortably.

1. Does it cite, and can I follow the citation to a real source in the Diário da República, DGSI or EUR-Lex?
2. Does it handle EU law alongside Portuguese law, where the question needs both?
3. Does it work in European Portuguese, not just translated English?
4. Can I try it without a procurement process or a large upfront commitment?
5. Is it clear about what it is, meaning information, not a substitute for a lawyer's judgment?

How to verify an AI legal answer in four steps

1. Read the citation, not just the answerA trustworthy tool names the statute, article or acórdão. No citation means no basis to check.
2. Open the sourceFollow the link to the Diário da República, DGSI or EUR-Lex and confirm the reference exists.
3. Match the wordingConfirm the article or decision actually says what the answer claims, and still applies today.
4. Escalate anything that mattersFor deadlines, money or rights at stake, use the checked answer to brief a lawyer, not to replace one.

The technology is improving quickly, and the honest state of things in mid-2026 is that the best tools are already useful and the worst are already dangerous. The difference between them is not sophistication. It is whether they let you check their work. For a sense of the everyday questions these tools get asked here, see our guide to common legal questions in Portugal.

General information, not legal advice.