diff --git a/docs/swarm/ui.md b/docs/swarm/ui.md
index 2e60a130..5b7f14ca 100644
--- a/docs/swarm/ui.md
+++ b/docs/swarm/ui.md
@@ -64,8 +64,9 @@ and the head commit the run read. A failed run shows its error, for example when
 has no API key yet.
 
 What you typed stays after a run, so you can edit the classification and run it
-again. The page saves nothing and posts nothing to the forge. It shows no token
-counts, cache counts or cost.
+again. The page saves no classification and no result, and posts nothing to the
+forge; like every table in the UI, the result table remembers its column
+filters in the browser. It shows no token counts, cache counts or cost.
 
 ### Scheduled prompts
 
diff --git a/frontend/packages/swarm-ui/src/pages/review-tryout/ReviewTryOutPage.tsx b/frontend/packages/swarm-ui/src/pages/review-tryout/ReviewTryOutPage.tsx
index fa52c568..4b353b07 100644
--- a/frontend/packages/swarm-ui/src/pages/review-tryout/ReviewTryOutPage.tsx
+++ b/frontend/packages/swarm-ui/src/pages/review-tryout/ReviewTryOutPage.tsx
@@ -7,8 +7,9 @@
 // `failed`. A run takes a minute or more, so the page says it is running.
 //
 // The inputs stay as typed after a run, so the operator can edit and run
-// again. The page stores nothing (not even in the browser) and posts nothing
-// to the forge.
+// again. The page keeps nothing you typed and no result, and posts nothing to
+// the forge; the only thing the browser remembers is the result table's
+// column filters, as for every table in the UI.
 import { useEffect, useState } from "preact/hooks";
 import { ApiErrorPanel } from "@hive/shared/api-error-panel.js";
 import { readApiError, type ProblemDetails } from "@hive/shared/api-error.js";
@@ -19,6 +20,7 @@ import { ClassificationEditor } from "./ClassificationEditor.js";
 import { TryOutResult } from "./TryOutResult.js";
 import {
   draftProblem,
+  duplicateName,
   prNumber,
   repoProblem,
   toBody,
@@ -29,8 +31,9 @@ import "./ReviewTryOutPage.css";
 
 const TRY_OUT = "/api/review-classifier/try-out";
 const POLL_MS = 2000;
-// More classifications than this are not offered a row; the backend has its
-// own cap and says so with a 400, which the page shows as it is.
+// More classifications than this are not offered a row. Keep it in step with
+// the try-out endpoint's own cap, which answers a longer list with a 400 that
+// the page shows as it is; the backend has no way to report it yet.
 const MAX_CLASSIFICATIONS = 10;
 
 let nextKey = 0;
@@ -115,6 +118,7 @@ export function ReviewTryOutPage() {
     repoProblem(repo) ??
     (prNumber(pr) === null ? "a PR number is a whole number above 0" : null) ??
     drafts.map(draftProblem).find((p) => p !== null) ??
+    duplicateName(drafts) ??
     null;
 
   async function run(e: Event) {
diff --git a/frontend/packages/swarm-ui/src/pages/review-tryout/TryOutResult.tsx b/frontend/packages/swarm-ui/src/pages/review-tryout/TryOutResult.tsx
index 668e1f30..771f52ec 100644
--- a/frontend/packages/swarm-ui/src/pages/review-tryout/TryOutResult.tsx
+++ b/frontend/packages/swarm-ui/src/pages/review-tryout/TryOutResult.tsx
@@ -51,7 +51,9 @@ export function TryOutResult({ result }: { result: Result }) {
       <Table
         columns={COLUMNS}
         rows={rows}
-        rowKey={(r) => r.name}
+        // By position: two classifications may share a name, and a shared key
+        // would let one result render over the other.
+        rowKey={(r) => String(rows.indexOf(r))}
         storageKey="swarm-ui:review-tryout:table-filters"
         emptyMessage="the run returned no classifications"
       />
diff --git a/frontend/packages/swarm-ui/src/pages/review-tryout/TryOutTypes.ts b/frontend/packages/swarm-ui/src/pages/review-tryout/TryOutTypes.ts
index 94d0de63..3c3a313b 100644
--- a/frontend/packages/swarm-ui/src/pages/review-tryout/TryOutTypes.ts
+++ b/frontend/packages/swarm-ui/src/pages/review-tryout/TryOutTypes.ts
@@ -81,6 +81,18 @@ export function draftProblem(d: ClassificationDraft): string | null {
   return null;
 }
 
+/** A name two classifications share, as a problem, or null: the result table
+ * names its rows by it, so a shared name leaves two rows nobody can tell apart. */
+export function duplicateName(drafts: ClassificationDraft[]): string | null {
+  const seen = new Set<string>();
+  for (const d of drafts) {
+    const name = d.name.trim();
+    if (seen.has(name)) return `two classifications are named ${name}`;
+    seen.add(name);
+  }
+  return null;
+}
+
 export function toBody(d: ClassificationDraft): ClassificationBody {
   return {
     name: d.name.trim(),