diff --git a/src/screens/CaseScreen.tsx b/src/screens/CaseScreen.tsx
index ce9d323..f9f8762 100644
--- a/src/screens/CaseScreen.tsx
+++ b/src/screens/CaseScreen.tsx
@@ -240,9 +240,16 @@ export function CaseScreen() {
         <Facts
           cols={3}
           rows={[
-            { label: 'Trigger', value: str(row.review_as_of) ? 'Manual run (historical date)' : 'Daily review' },
-            { label: 'Data as of', value: str(row.review_as_of) ? str(row.review_as_of).slice(0, 10) : 'Latest available' },
-            { label: 'Look-back', value: row.period_weeks ? `${str(row.period_weeks)} weeks` : '6 weeks' },
+            { label: 'Trigger', value: str(row.review_as_of) || str(row.review_from) || str(row.review_to) ? 'Custom run (chosen dates)' : 'Daily review' },
+            { label: 'Data as of', value: str(row.review_to || row.review_as_of) ? str(row.review_to || row.review_as_of).slice(0, 10) : 'Latest available' },
+            {
+              label: 'Analysis window',
+              value: str(row.review_from)
+                ? `${str(row.review_from).slice(0, 10)} – ${str(row.review_to || row.review_as_of).slice(0, 10) || 'latest'}`
+                : row.period_weeks
+                  ? `${str(row.period_weeks)} weeks`
+                  : '6 weeks',
+            },
             ...(str(row.review_note) ? [{ label: 'Reviewer note', value: str(row.review_note), wide: true }] : []),
             ...(str(row.approval_note) ? [{ label: 'Approval note', value: str(row.approval_note), wide: true }] : []),
           ]}
diff --git a/src/screens/RunReviewScreen.tsx b/src/screens/RunReviewScreen.tsx
index f63ee3e..97c1951 100644
--- a/src/screens/RunReviewScreen.tsx
+++ b/src/screens/RunReviewScreen.tsx
@@ -1,9 +1,10 @@
 import { useState } from 'react';
 import { useNavigate } from 'react-router-dom';
-import { Brain, Database, Moon, Radar } from 'lucide-react';
+import { Brain, CalendarRange, Database, Radar } from 'lucide-react';
 import { useZino } from '../api/provider';
 import { ACT, LAKEHOUSE, QUIET_MORNING_AS_OF, WORKFLOW } from '../api/config';
-import { Button, Card, ErrorNote } from '../components/core';
+import { Button, Card, ErrorNote, Input, Label } from '../components/core';
+import { shortDate } from '../format';
 
 /**
  * Run the daily review, now.
@@ -12,28 +13,43 @@ import { Button, Card, ErrorNote } from '../components/core';
  * the button exists so a room does not have to wait until 6am. Nothing is
  * asked of Ava — she decides what, if anything, is worth a person's time.
  *
- * The second button anchors the sweep on a date before the August spike. The
- * demo data is static, so without it every run flags the same thing; with it,
- * one run can genuinely come back "nothing to report" — which is what most
- * mornings look like, and the contrast is the point.
+ * The custom run lets the reviewer choose the dates: what the data should be
+ * treated as "as of" (a replayed morning), and the window Ava compares against
+ * its baseline. The demo data is static, so without a date every run flags
+ * the same thing; anchored before the August spike, a run can genuinely come
+ * back "nothing to report" — which is what most mornings look like.
  */
 export function RunReviewScreen() {
   const navigate = useNavigate();
   const { client } = useZino();
-  const [busy, setBusy] = useState<'now' | 'quiet' | null>(null);
+  const [busy, setBusy] = useState<'now' | 'custom' | null>(null);
   const [err, setErr] = useState<string | null>(null);
+  const [asOf, setAsOf] = useState('');
+  const [from, setFrom] = useState('');
+  const [to, setTo] = useState('');
 
-  async function run(asOf?: string) {
-    setBusy(asOf ? 'quiet' : 'now');
+  // The window Ava will actually use, so the reviewer sees it before pressing Run.
+  const effectiveTo = to || asOf;
+  const dateErr =
+    from && effectiveTo && from > effectiveTo
+      ? 'The window must start before it ends.'
+      : to && asOf && to > asOf
+        ? '"Window to" cannot be after "data as of".'
+        : null;
+
+  async function run(custom: boolean) {
+    setBusy(custom ? 'custom' : 'now');
     setErr(null);
     try {
-      // The activity's one field is optional; omit it entirely for a live run
-      // so the workflow sees a genuinely empty submission.
-      const res = await client.startInstance(
-        WORKFLOW,
-        ACT.REVIEW,
-        asOf ? { review_as_of__review: asOf } : {},
-      );
+      // Every field on the activity is optional; send only the ones the
+      // reviewer set, so a plain run is a genuinely empty submission.
+      const data: Record<string, string> = {};
+      if (custom) {
+        if (asOf) data.review_as_of__review = asOf;
+        if (from) data.review_from__review = from;
+        if (to) data.review_to__review = to;
+      }
+      const res = await client.startInstance(WORKFLOW, ACT.REVIEW, data);
       if (res.instance_id) navigate(`/c/${res.instance_id}`);
       else navigate('/q/investigating');
     } catch (e) {
@@ -83,26 +99,76 @@ export function RunReviewScreen() {
           </div>
         </div>
 
-        <div className="mt-5 flex flex-wrap items-start gap-3 border-t border-line pt-4">
-          <div>
-            <Button kind="primary" onClick={() => run()} busy={busy === 'now'} disabled={busy !== null}>
-              <Radar className="h-4 w-4" />
-              Run review
-            </Button>
-            <p className="mt-1 max-w-[16rem] text-[11px] text-faint">
-              Scheduled daily at 06:00. This runs the same activity immediately.
+        <div className="mt-5 border-t border-line pt-4">
+          <Button kind="primary" onClick={() => run(false)} busy={busy === 'now'} disabled={busy !== null}>
+            <Radar className="h-4 w-4" />
+            Run review
+          </Button>
+          <p className="mt-1 text-[11px] text-faint">
+            Latest data, last 6 weeks against the 8 weeks before. Scheduled daily at 06:00; this runs
+            the same activity immediately.
+          </p>
+        </div>
+      </Card>
+
+      <Card className="px-4 py-4">
+        <div className="flex items-start gap-3">
+          <span className="rounded-full bg-panel2 p-2 text-muted ring-1 ring-line ring-inset">
+            <CalendarRange className="h-4 w-4" />
+          </span>
+          <div className="min-w-0 flex-1">
+            <p className="font-semibold text-ink">Custom run</p>
+            <p className="mt-0.5 text-sm text-muted">
+              Replay a past morning, or point the review at a specific period. Leave a date blank to
+              use the default.
             </p>
           </div>
+        </div>
+
+        <div className="mt-4 grid gap-3 sm:grid-cols-3">
           <div>
-            <Button kind="secondary" onClick={() => run(QUIET_MORNING_AS_OF)} busy={busy === 'quiet'} disabled={busy !== null}>
-              <Moon className="h-4 w-4" />
-              Run as of {QUIET_MORNING_AS_OF}
-            </Button>
-            <p className="mt-1 max-w-[16rem] text-[11px] text-faint">
-              Runs the review against data as of this date — a period with no material change,
-              to show a no-findings outcome.
-            </p>
+            <Label>Data as of</Label>
+            <Input type="date" value={asOf} onChange={setAsOf} />
+            <p className="mt-1 text-[11px] text-faint">Ignore anything after this date. Try {shortDate(QUIET_MORNING_AS_OF)} for a quiet morning.</p>
           </div>
+          <div>
+            <Label>Window from</Label>
+            <Input type="date" value={from} onChange={setFrom} />
+            <p className="mt-1 text-[11px] text-faint">Start of the period Ava analyses.</p>
+          </div>
+          <div>
+            <Label>Window to</Label>
+            <Input type="date" value={to} onChange={setTo} />
+            <p className="mt-1 text-[11px] text-faint">End of the period. Defaults to "data as of".</p>
+          </div>
+        </div>
+
+        <p className="mt-3 text-xs text-muted">
+          {dateErr ? (
+            <span className="text-bad">{dateErr}</span>
+          ) : (
+            <>
+              Ava will compare{' '}
+              <span className="font-semibold text-ink">
+                {from ? shortDate(from) : effectiveTo ? '6 weeks before' : 'the last 6 weeks'}
+                {from || effectiveTo ? ` – ${effectiveTo ? shortDate(effectiveTo) : 'latest data'}` : ''}
+              </span>{' '}
+              against the 8 weeks before it
+              {asOf ? `, treating ${shortDate(asOf)} as the latest date` : ''}.
+            </>
+          )}
+        </p>
+
+        <div className="mt-4">
+          <Button
+            kind="secondary"
+            onClick={() => run(true)}
+            busy={busy === 'custom'}
+            disabled={busy !== null || !!dateErr || (!asOf && !from && !to)}
+          >
+            <CalendarRange className="h-4 w-4" />
+            Run with these dates
+          </Button>
         </div>
       </Card>
     </div>