Now open — and free, for a limited time.Full access. No card. Just sign in.
Legal intelligence, verified
Every answer,
tied to its authority.
Ask the world's law — any jurisdiction, any tradition, any era. lawyerbase answers with real sources, then independently checks every sentence against them and shows you the result. It does the research; you make the judgment.
Free while in open access · the check is on every answer, on every plan
My landlord kept my full deposit for “general wear”. The flat is in Berlin — can they do that?
In short: ordinary wear is the landlord's cost. German law treats normal wear and tear as covered by the rent itself1; a deposit may be kept only against specific, provable claims2.
From the Code of Ur-Nammu to this morning's ruling — one argument, never finished.
Every tradition · every era · every jurisdiction · every language
The problem, in the field's own numbers
A fabricated citation is a career event. The leading tools still produce them.
Peer-reviewed research found the leading paid legal AI tools hallucinate 17–33% of the time — despite “hallucination-free” marketing. Verifying by hand undoes the time they save. That trade ends here: verification is native, not a second job.
Magesh · Surani · Dahl · Suzgun · Manning · Ho — J. Empirical Legal Studies, 2025
An answer you cannot verify is not a shortcut — it is a liability, with your name, your bar number, and your client's interests attached. In Mata v. Avianca, the sanctioned attorney's testimony became the profession's cautionary archetype: “I just never thought it could be made up.” lawyerbase is built the other way: it does not ask for your trust — it hands you the means to test every claim, in seconds.
In practice
Not a summary. A reasoned position — with its proof on the table.
Put a real question to lawyerbase — the kind with competing considerations, unsettled law, and something at stake. It reasons through the matter as a domain specialist would: assembling the governing authorities, testing the position against the strongest counterargument, and marking honestly where the law divides. Every proposition traceable. Every source one click from opening. Nothing resolved by confident tone where the law itself is not resolved.
Question
A supply contract forfeits 80% of all prepayments if the buyer cancels early. Is that forfeiture enforceable?
Likely not enforceable as written. Across the major contract traditions, a court may reduce a penalty that is manifestly excessive in relation to the actual loss — even one the parties agreed to.[1][2][3] An 80% forfeiture will usually be treated as a penalty open to reduction, not a clause enforced in full.
Where the law is unsettled: the threshold for “grossly excessive” and whether the right to reduction can be contractually waived differ by jurisdiction. lawyerbase names the uncertainty rather than resolving it with false confidence — confirm the governing law before you advise on this.
Every proposition above traces to a citable authority on the next tab.
What it does
Designed for what the profession cannot forgive getting wrong.
Every proposition carries its authority
Open any line and the source behind it opens with it — the statute, the ruling, the clause. Lawyers have been sanctioned in open court for trusting tools that did not. lawyerbase makes every claim auditable by design.
It names what the law leaves unresolved
When doctrine divides or jurisdictions disagree, lawyerbase shows you the split — the competing lines, the unresolved questions. It never resolves uncertainty with false confidence. That is the profession's duty, and it stays with you.
Domain-engineered, not generalist
Maritime, tax, competition, family — for each field, it assembles the governing doctrine and the authorities that actually decide such cases, then reasons from inside that domain. Not one model answering everything thinly.
The judgment — and the responsibility — stays yours
lawyerbase researches, reasons, and tests your position against its strongest opponent. Then it stops. The decision is yours. So is the professional responsibility. ABA Opinion 512 requires it. So does every instinct you developed as a lawyer.
Everything inside
The full platform. Every capability. Nothing held back.
No tiers, no locked features, no “contact sales.” While the doors are open, everything below is included — free, for a limited time.
Research that stands up
Answers with the authority attached
Every answer arrives with numbered citations and the exact passage each one rests on — statute, code, treaty, or ruling. One click opens the source itself, not a paraphrase of it.
A grounding check on every answer
Before an answer reaches you, an independent review pass compares each statement against the passage it cites — and repairs what it cannot support. You see the result of that check, statement by statement, on the answer itself.
Uncertainty, named
Where doctrine divides or jurisdictions disagree, the answer says so and shows the competing lines. Nothing unsettled is ever resolved with confident tone.
Sourced and unsourced, kept apart
What the authorities support is cited. What comes from general legal knowledge is set apart in its own clearly marked section — so you always know which is which.
Contracts, reviewed against the law itself
Contract Studio
Upload a contract and it is mapped clause by clause, each clause typed by what it actually does — indemnity, limitation, termination, assignment, and beyond.
Review under the governing law
Choose the governing law and every clause is tested against that law's own provisions — with the statute cited next to the risk it raises. Not a checklist. The law itself.
Ask the contract anything
Question the document directly — what happens on early termination, who bears the risk, where the caps bite — and get answers that quote the clause and the law together.
Your documents, in the conversation
Bring contracts, memos, and filings into any conversation. The reasoning takes your documents into account alongside the authorities.
Depth, memory, and control
The world's law, one corpus
Statutes, codes, and treaties across the United States, the European Union, the United Kingdom, Germany, France, Türkiye, Japan, India, Canada, Australia, Spain, Ireland and growing — every tradition, continuously expanding.
A specialist for every field
Maritime, tax, competition, employment, IP, family — the reasoning is assembled for the field your matter calls for, with the doctrine and authorities that actually govern it.
Conversations that continue
Every matter is a dialogue, not a one-shot query. Follow up, press on a point, return tomorrow — your history is kept and every thread resumes where you left it.
Your account, properly protected
Sign in with your email, add two-factor authentication from your authenticator app in one step, and know your work is held to the standard confidential legal material demands.
A specialist for every matter
Ask about maritime law. It answers as a maritime lawyer would.
This is the central idea of agentic domain engineering: you do not take a general-purpose system and point it at a field. You engineer the intelligence into the field itself — its doctrine, its hierarchy of authority, the conventions and arbitral awards that actually govern such disputes, the arguments practitioners in that field make and the ones courts in that field accept. lawyerbase does this for every domain in law. Not one model answering everything thinly — the right expertise, built for the matter in front of you, every time.
Why it's different
Every other tool asks you to trust it. lawyerbase lets you verify it.
Harvey, CoCounsel, Lexis+, vLex — well-funded, fast, and built on the same idea: surface relevant text and summarise. The efficiency paradox they all share: to use them safely, you must verify every claim by hand — which destroys the time savings they promise. lawyerbase resolves this. It is not a faster search. It is a different architecture: every answer arrives with its authorities already attached, the chain of reasoning visible, uncertainty named — so verification takes seconds, not hours.
Search-and-summary AI
- Answers arrive as: a confident summary
- When the law is unsettled: equally confident
- Citations: 17–33% fabricated (JELS, 2025)
- Coverage: one jurisdiction's database
- Verification: your problem — verify by hand or trust and risk it
- Your role: trust first, discover the error later
lawyerbase
- Answers arrive as: a reasoned position with every authority attached
- When the law is unsettled: it names the split and shows the competing lines
- Citations: traceable — one click to the actual source
- Coverage: every tradition, every era, every jurisdiction
- Verification: native — built into every answer, seconds not hours
- Your role: verify fast, then put your name to it
The lineage of an idea
Good faith did not begin in 2026. It began in Rome.
A doctrine derives its authority from the argument that has held it across centuries. lawyerbase traces every principle to its origin and follows it forward: from Roman bona fides through the ius commune, the Code Napoléon, BGB § 242, to the UNIDROIT Principles governing your cross-border contract today. Other systems give you the rule. lawyerbase gives you the reason it has held for two thousand years — and the confidence to cite it as if you know why.
- ClassicalRome — bona fides
- Late antiquityJustinian — Corpus Juris Civilis
- MedievalThe ius commune & canon law
- Early modernGrotius — the law of nations
- ModernCode Napoléon · German BGB § 242
- ContemporaryUNIDROIT — international commercial law
Every legal system alive today is an heir to an argument that predates most of the nations that enacted it. The Cambridge Law Corpus preserves 250,000 UK decisions from the sixteenth century forward. lawyerbase holds the whole conversation.
Who it's for
For those who practise law — and the five billion people the law has not yet reached.
For lawyers & legal teams
The efficiency paradox of today's AI tools: verify every output by hand and you lose the time savings; trust without verifying and you risk the duty. 91% of legal professionals say AI must be held to a higher accuracy standard than humans. 41% require 100% before they will use output without review. lawyerbase is built for exactly that standard — every claim sourced, every authority one click from opening, verification a matter of seconds. The judgment stays yours, because the rules require it — and because that is what you are for.
For everyone else
5.1 billion people worldwide have an unmet justice need. 92% of civil legal problems affecting low-income Americans receive no adequate help. Most people encounter the law at the worst moment of their lives — an eviction notice, a dismissal, a custody dispute — and face it alone. lawyerbase meets them in plain language, grounded in the actual law, honest about what is uncertain, and clear about when a real lawyer is the right next step. It does not invent comfort. It does not pretend to be counsel. It opens the door.
Scope
All of law. Every tradition. Every era. Reasoned across all of it.
Law does not respect the boundaries of a single jurisdiction's database. The clause in your contract traces to Roman sale doctrine. The constitutional argument turns on an eighteenth-century English precedent. The cross-border dispute pulls in treaty obligations your opponent has studied and you have not. lawyerbase was built on a single conviction: the only corpus that can serve serious legal work is one that holds every tradition, every era, and every jurisdiction — and reasons across all of them in a single answer.
Roman & Civil
From the Twelve Tables through Justinian's Digest to the great codifications of the nineteenth century — the conceptual spine of most of the world's private law, still visible in every modern contract.
Common Law
A living argument across centuries of judgments — doctrine built case by case, ratio extracted from the reasoning that actually decided, precedent still forming today.
Islamic Law
Fiqh, usul al-fiqh, and the great madhabs: a tradition of rigorous juristic reasoning that has shaped the legal systems of more than fifty nations and governs the lives of hundreds of millions.
Customary & Indigenous
Unwritten yet binding — the practices that govern land, family, and dispute resolution for much of humanity, increasingly recognised by international instruments and domestic courts.
Canon & Religious
Canon law, rabbinical responsa, ecclesiastical courts: traditions whose imprint on contract, marriage, and succession law is still surfacing in litigation today.
International & Transnational
Treaties, soft law, arbitral awards, WTO panels, ICJ and ICC decisions — the layer no domestic practitioner can ignore, and the one most likely to have been studied harder by the other side.
The corpus is never finished — and a frozen dataset is a liability in a field that moves every day. Every ruling handed down this morning is a candidate for inclusion. The answer to your question must reflect the law as it stands now, not as it stood when a training run last closed. Stale law is not law. It is a risk you cannot see.
Open now · Free for a limited time
The doors are open. Walk in.
No waitlist, no invitation, no card. Create an account and put a real question to the law — every answer sourced, every authority openable, every limit named. While we open the doors, the full platform is free.
Free while the doors are open — every capability included. No card is ever collected, so nothing is charged when the free period ends. Paid plans will be announced here first, with clear notice to every account before anything changes.
Built by Ideasets
A venture of Ideasets — a company that identifies where the world is heading, then builds it before the market knows to look.
Ideasets was founded on a single conviction: there is no such thing as impossible — only the not-yet-achieved. It works at the frontier of domains: identifying where human expertise and artificial intelligence, working as one, can produce something that neither could produce alone — and building it before anyone else recognises the opportunity. Its method is agentic domain engineering: not prompt engineering, not a chatbot with a domain label, but AI trained deeply into a field, reasoning within it alongside the people who have spent their careers in it.
lawyerbase is that method, turned on law — the most complex, most consequential, and most underserved domain in the world. The question is not whether law will be transformed by this. It is whether the transformation will be done right.
One compounding loop
lawyerbase is that loop, turned on law — detect the matter, predict its governing doctrine, interpret it with domain expertise, build the answer with its authorities, learn from every case that follows. The algorithm finds the pattern. The lawyer gives it consequence.
The Ideasets portfolio
“The future is agentic domain engineering — human expertise and artificial intelligence, reasoning together in every domain, at the absolute frontier.”