diff --git a/packages/dashboard/app/components/__tests__/SettingsModal.memory-editor.test.ts b/packages/dashboard/app/components/__tests__/SettingsModal.memory-editor.test.ts
new file mode 100644
index 000000000..71933af7d
--- /dev/null
+++ b/packages/dashboard/app/components/__tests__/SettingsModal.memory-editor.test.ts
@@ -0,0 +1,40 @@
+import { describe, expect, it } from "vitest";
+import { loadAllAppCss } from "../../test/cssFixture";
+
+function extractMediaBlock(css: string, mediaQuery: string): string {
+  const start = css.indexOf(mediaQuery);
+  expect(start).toBeGreaterThanOrEqual(0);
+
+  const openBrace = css.indexOf("{", start);
+  expect(openBrace).toBeGreaterThanOrEqual(0);
+
+  let depth = 1;
+  for (let i = openBrace + 1; i < css.length; i += 1) {
+    if (css[i] === "{") depth += 1;
+    if (css[i] === "}") depth -= 1;
+    if (depth === 0) {
+      return css.slice(openBrace + 1, i);
+    }
+  }
+
+  throw new Error(`Unable to extract media block for ${mediaQuery}`);
+}
+
+describe("FN-4416 SettingsModal memory editor mobile height", () => {
+  it("keeps base 50vh and mobile min-height at or above desktop", async () => {
+    const css = await loadAllAppCss();
+
+    const baseMatch = css.match(/\.memory-editor-frame\s*\{[^}]*min-height\s*:\s*(\d+(?:\.\d+)?)vh\s*;[^}]*\}/);
+    expect(baseMatch).not.toBeNull();
+    const baseHeight = Number(baseMatch?.[1]);
+    expect(baseHeight).toBe(50);
+
+    const mobileBlock = extractMediaBlock(css, "@media (max-width: 768px)");
+    const mobileMatch = mobileBlock.match(/\.memory-editor-frame\s*\{[^}]*min-height\s*:\s*(\d+(?:\.\d+)?)vh\s*;[^}]*\}/);
+    expect(mobileMatch).not.toBeNull();
+
+    const mobileHeight = Number(mobileMatch?.[1]);
+    expect(mobileHeight).toBeGreaterThanOrEqual(baseHeight);
+    expect(mobileHeight).toBe(65);
+  });
+});