Westlaw KeyCite Flags vs Shepard's Citator Signals

KeyCite and Shepard's answer the same question with different alphabets. On Westlaw, a red flag means the case is no longer good law for at least one point, a yellow flag means there is negative treatment short of reversal, and an orange caution icon means the case relied on something that was itself overruled. On Lexis, a red stop sign is the equivalent of the red flag, a yellow triangle is roughly the yellow flag, and an orange Q means the case's validity was questioned by intervening authority. Neither symbol tells you whether the case is good law for your point. Both tell you where to start reading.

Most lawyers learn one system in school and then spend a career translating. If you trained on Westlaw and your new firm bought Lexis, the colors look familiar enough to be dangerous: red means the same thing in both, yellow does not mean quite the same thing, and each system has one signal the other has no direct equivalent for. Here is the side-by-side, what each symbol actually claims, and where the two genuinely disagree.

Westlaw KeyCite flags vs Shepard's Signals side by side

The mapping below is approximate on purpose. These are two independently edited products, and the closest counterpart is not the same as an equivalent. Read the row, not just the color.

Two differences are worth committing to memory. First, Shepard's has a positive signal and KeyCite does not. The green diamond is a real editorial judgment that later courts followed or affirmed the case, and there is no KeyCite flag that says the same thing. A Westlaw case with no flag is not endorsed; it is merely unflagged. Second, KeyCite has a blue striped flag for a pending appeal and Shepard's does not carry a distinct symbol for it. If you practice somewhere that appeals move quickly, that is a signal you will miss when you switch platforms.

What does a red flag on Westlaw mean?

A red flag means the case is no longer good law for at least one point of law. That is the whole claim, and the qualifier at the end is the part people drop. A red flag does not mean the opinion has been erased. A twelve page opinion can be overruled on a single evidentiary holding and remain the leading authority in the state on the other four issues it decided.

So the flag is a routing instruction, not a verdict. When you see red, the next step is to find which point of law was affected and compare it to the proposition you are citing the case for. If your brief cites the case for its statute of limitations analysis and the red flag traces to a later decision overruling its treatment of expert testimony, the case is still perfectly citable for your purpose, and a competent opponent will know that too. What you cannot do is cite it without knowing which is which.

What is the difference between KeyCite and Shepard's?

Editorially they are the same species: attorney editors at Thomson Reuters and LexisNexis read later decisions and classify how each one treated the earlier case. The differences that matter in practice are coverage, vocabulary, and judgment calls.

The judgment calls are the interesting part. Because two sets of human editors are reading the same later opinions independently, they sometimes classify the same treatment differently. A case can carry a yellow flag on Westlaw and a red stop sign on Lexis, or be flagged on one platform and clean on the other, because one editorial team read a later opinion as overruling and the other read it as distinguishing. This is not a bug in either product. It is what it looks like when a genuinely debatable question gets two honest answers.

The practical consequence for a firm that only subscribes to one is that you are seeing one editorial opinion about your authority, not the objective status of it. That is fine, and it is what nearly every firm in the country does. It is worth knowing about when an opposing brief characterizes a case differently than your citator did, because the disagreement may be real rather than sharp practice. For a fuller treatment of how citators work as a category, see our explainer on what a citator is, the step by step on how to shepardize a case, and the side by side of every major legal citator including BCite and the algorithmic options.

Is there a free citator?

Partly. There are three tiers of reality here and they are usually blurred together.

The editorial citators are KeyCite and Shepard's, plus BCite on Bloomberg Law. All three involve human editors classifying treatment, and all three come attached to a paid platform. The algorithmic tier is Authority Check, which comes with Fastcase and vLex and is frequently available at no extra cost through a state bar membership. It identifies citing references and flags negative signals by algorithm rather than by editorial review, which makes it genuinely useful and not the same product.

The third tier is the free case law databases, and this is where people get hurt. CourtListener, run by the nonprofit Free Law Project, holds more than nine million decisions from over two thousand courts and covers the overwhelming majority of precedential published US case law after absorbing Harvard's Caselaw Access Project data in March 2024. Its coverage problem is basically solved. It has Authorities and Cited By lists, so you can see what a case cited and who cited it. What it does not have is editorial treatment: nothing tells you that a citing case overruled rather than merely mentioned. Google Scholar is in the same position. Coverage is not the gap in free legal research. The citator is the gap, and reading a list of citing cases yourself is not a substitute for one unless you actually read them.

What a citator will not tell you

Even a good editorial citator is silent on several things that will get a citation struck.

It generally will not tell you whether the decision was citable in the first place. Every state has its own machinery for producing written appellate work that carries no precedential weight, and the rules are not intuitive. Missouri lets a panel affirm by memorandum decision and attach a written statement explaining exactly why, and Rule 84.16(b) provides that the statement "shall not be reported, and shall not be cited or otherwise used in any case before any court." Tennessee lets its Supreme Court strip an intermediate opinion of precedential value after the fact when it denies permission to appeal. Neither fact is a treatment signal, so neither shows up as a flag. We break these down state by state in our guide to Missouri case law search and the overview of what court decisions are binding in your state.

It will not tell you whether the case binds your court. A published opinion from one district of a multi district intermediate appellate court is often only persuasive in the next district over, and no flag color captures that. And it will not tell you whether a case exists. That sounds absurd until you remember that a citator lookup on a fabricated citation returns nothing, which reads as "no negative treatment" to someone in a hurry. That failure mode is exactly how sanctioned briefs happen, and it is why the verification step has to be a deliberate one rather than a glance at a color. Our guide on avoiding hallucinated citations covers the checks that actually catch it.

Which citator should a small firm actually pay for?

For most solos and small firms the honest answer is that the citator is not the thing you should be choosing first, because you cannot buy KeyCite or Shepard's separately. You buy Westlaw or you buy Lexis, and the citator arrives attached. So the decision is really about the platform, the contract length, and what your practice area needs, and the citator is one input among several.

A few things are worth checking before you sign either one. Confirm which content tiers include the citator at all, because on the Lexis self serve store Shepard's is included on the Essential, Enhanced, and Professional research tiers but not on Deluxe Transactional, which is a drafting suite rather than a research plan. Confirm what happens at renewal, since multi year terms are discounted precisely because they are hard to leave. And if your firm has quietly accumulated several overlapping subscriptions, it is worth doing the same thing you would do with any other recurring software spend and actually listing what renews when, because research platforms are among the easiest line items to keep paying for out of habit.

If what you actually need is to know whether a case is still good law, and the platform around it is more than your practice requires, that is the gap Casesearch is built for. Ask the question in plain English, get the controlling decisions with the holding in ordinary language, the citation formatted properly, and a signal for whether the case has been treated badly since. It is a research tool rather than legal advice, and you still read the opinion, but the check stops being a separate paid platform. Our citation check feature covers how that works, and pricing starts at 39 dollars a month.

Common questions

Does a yellow flag mean I cannot cite the case? No. A yellow flag means the case has negative treatment that stopped short of reversal or overruling, such as criticism or a holding limited to particular facts. It stays citable. Read the negative citing references, decide whether any of them touch the point you are relying on, and be ready to address the strongest one in your brief rather than hoping opposing counsel misses it.

What does the orange icon mean on Westlaw? The orange caution icon is KeyCite Overruling Risk. It indicates that a point of law in the case has been implicitly undermined because the case relied on a prior decision that was itself directly overruled or otherwise invalidated. Nothing has happened to your case directly, which is why it is not a red flag, but its foundation moved.

Is Shepard's better than KeyCite? Neither is reliably better. They are built the same way, by attorney editors classifying how later decisions treated an earlier one, and they disagree at the margins because those classifications involve judgment. Shepard's gives you an explicit positive signal that KeyCite lacks; KeyCite gives you a distinct pending appeal flag that Shepard's lacks. Practitioners generally prefer whichever they trained on.

Do I still need to read the citing cases? Yes, for anything load bearing. The signal tells you that treatment exists and roughly how bad it is. It cannot tell you whether the treatment touches the specific proposition you are citing, and that is the only question that decides whether your citation survives. Treat the flag as the reason to open the citing references, not as a substitute for opening them.