diff --git a/frontend/src/__tests__/recommendations.test.ts b/frontend/src/__tests__/recommendations.test.ts
index 9f6e90c9..ebf066a7 100644
--- a/frontend/src/__tests__/recommendations.test.ts
+++ b/frontend/src/__tests__/recommendations.test.ts
@@ -5156,6 +5156,22 @@ describe('Issues #225 + #226: cell grouping with savings range and collapse/expa
       expect(groups.size).toBe(2);
     });
 
+    test('EC2 recs differing only by platform or tenancy are separate cells; same pair shares one (issue #806)', () => {
+      const d = { platform: 'Linux/UNIX', tenancy: 'default' };
+      const base = mkRec({ details: d });
+      expect(groupRecsByCell([base, mkRec({ details: { ...d, platform: 'Windows' } })]).size).toBe(2);
+      expect(groupRecsByCell([base, mkRec({ details: { ...d, tenancy: 'dedicated' } })]).size).toBe(2);
+      expect(groupRecsByCell([base, mkRec({ details: { ...d }, term: 3 })]).size).toBe(1);
+      const zonal = mkRec({ availability_zone: 'us-east-1a', details: d });
+      expect(Array.from(groupRecsByCell([zonal]).keys())[0]).toBe('aws||ec2|us-east-1|m5.large||us-east-1a|Linux/UNIX|default');
+    });
+
+    test('non-EC2 recs and EC2 recs without platform/tenancy keep their cell key (issue #806)', () => {
+      const rds = mkRec({ service: 'rds', details: { platform: 'x', tenancy: 'y' } });
+      expect(Array.from(groupRecsByCell([rds]).keys())[0]).toBe('aws||rds|us-east-1|m5.large|');
+      expect(Array.from(groupRecsByCell([mkRec({ details: { instance_type: 'm5.large' } }), mkRec({})]).keys())).toEqual(['aws||ec2|us-east-1|m5.large|']);
+    });
+
     test('zonal EC2 recs differing only by AZ are separate cells; regional recs are unchanged (issue #792)', () => {
       const a = mkRec({ availability_zone: 'us-east-1a' });
       const b = mkRec({ availability_zone: 'us-east-1b' });
diff --git a/frontend/src/recommendations.ts b/frontend/src/recommendations.ts
index d0e81d38..6f44b1be 100644
--- a/frontend/src/recommendations.ts
+++ b/frontend/src/recommendations.ts
@@ -991,7 +991,24 @@ function cellKey(rec: LocalRecommendation): string {
   const key = `${rec.provider}|${rec.cloud_account_id ?? ''}|${rec.service}|${rec.region}|${rec.resource_type}|${rec.engine ?? ''}`;
   // Zonal EC2 recs in different AZs are distinct purchasable cells (issue #792);
   // the suffix is added only for them so every other cell key is unchanged.
-  return rec.availability_zone ? `${key}|${rec.availability_zone}` : key;
+  const zonal = rec.availability_zone ? `${key}|${rec.availability_zone}` : key;
+  // EC2 recs differing only by platform or tenancy are distinct purchasable cells
+  // (issue #806). Verbatim values from details, same source as
+  // samePurchaseVariantIdentity; the pair is added only when either is set.
+  const { platform, tenancy } = computeIdentity(rec);
+  return platform || tenancy ? `${zonal}|${platform}|${tenancy}` : zonal;
+}
+
+function computeIdentity(rec: LocalRecommendation): { platform: string; tenancy: string } {
+  const details = rec.details;
+  if ((rec.service !== 'ec2' && rec.service !== 'compute') || typeof details !== 'object' || details === null || Array.isArray(details)) {
+    return { platform: '', tenancy: '' };
+  }
+  const { platform, tenancy } = details as Record<string, unknown>;
+  return {
+    platform: typeof platform === 'string' ? platform : '',
+    tenancy: typeof tenancy === 'string' ? tenancy : '',
+  };
 }
 
 // issues #225 + #226: cell-grouping helpers.