The doctrine, in one paragraph
Every state defines unauthorized practice of law slightly differently, but the core test — across forty-plus state supreme courts that have addressed the question over the past century — is whether the activity involves the application of legal judgment to the specific facts of a specific person's situation, in a way that creates a relationship of professional trust and reliance. Filling out a generic form is not UPL. Telling a specific person, in their specific situation, that this is the right form for them and that this is how they should fill it out, is something a lawyer does. The closer a tool gets to that second activity, the more UPL-like it becomes.
The three audiences for a tool you build
(1) Tools you use yourself
If you build a tool to support your own practice — an intake form your firm uses, a settlement tracker you check daily, a document automation that produces drafts you then review — there is no UPL question. You are a licensed lawyer applying legal judgment, with the tool as one of your tools. This is the practice of law, supported by software, full stop.
This is the dominant use case for BuildLegal and the one with the cleanest doctrinal footing. The vast majority of tools lawyers should be building right now sit in this bucket.
(2) Tools you share with colleagues at your firm
Sharing a tool inside your firm doesn't change anything. The lawyer applying judgment to a client's matter is the lawyer using the tool, not the lawyer who built it. As long as the firm's lawyers are reviewing the tool's outputs as part of their practice — which is what Rule 5.3 supervision requires anyway — the analysis is the same as for tools you built for yourself.
(3) Tools you put in front of non-clients
This is the interesting bucket. The moment a tool you built is being used by a non-client to make decisions about their own legal situation — without a lawyer in the loop — UPL becomes a live question. Three points along the spectrum:
- A self-help form that produces a generic document the user could have downloaded from a court website. Generally permissible. This is the LegalZoom space, and the law (in most states) has settled to allow it.
- A tool that asks the user about their situation and then renders judgment — "based on what you said, you should file Form X with these specific provisions." UPL-adjacent in most states. The more individualized the judgment, the riskier the tool.
- A tool that purports to give legal advice, holds itself out as a lawyer or substitute for one, or creates a relationship of professional reliance. Clearly UPL in essentially every state.
What makes a tool more or less UPL-like
| Less risky | More risky |
|---|---|
| Generic forms with blanks the user fills in. | Forms with conditional logic that picks language based on the user's facts. |
| Output the user clearly understands is a draft they're producing themselves. | Output that reads as a recommendation tailored to them. |
| Clear disclaimers that the tool is not legal advice and the user is producing their own document. | Branding or framing that suggests legal expertise ("our AI lawyer", "legal advice"). |
| A lawyer reviews the output before it's used. | The user acts on the output without ever speaking to a lawyer. |
| The user is your existing client. | The user is the general public, paying for the tool directly. |
Key cases and authorities
- Janson v. LegalZoom.com, Inc., 802 F. Supp. 2d 1053 (W.D. Mo. 2011) — settled the question of generic-form-fill in the LegalZoom mold. The case ultimately settled, but the reasoning has been broadly followed.
- Mata v. Avianca, Inc., No. 22-cv-1461 (S.D.N.Y. 2023) — not a UPL case, but the canonical lesson on what happens when AI output is used in a court filing without verification. Read it.
- Florida Bar Ethics Opinion 24-1 (Jan 2024) — addresses AI use by lawyers, and includes useful analysis of the lawyer's responsibility for outputs that touch clients.
- ABA Formal Opinion 512 (July 2024) — the controlling national synthesis on AI use, including the supervision and competence pieces relevant to whether a tool needs lawyer review.
- Your state's UPL statute and enforcement track record — varies dramatically. California, Texas, and Florida are particularly active in this space.
A clean way to think about it
If a tool replaces something an associate at your firm would do, and the lawyer who would have supervised the associate is still in the loop reviewing the work — it's a tool. If a tool replaces a lawyer in the relationship, with no lawyer reviewing the output before it lands in the user's hands, you should be very careful.
BuildLegal is built around the first half of that sentence. Most of what lawyers build here is meant to support their own work, with the lawyer in the loop. That's the use case the doctrine and the bar opinions both treat most generously.