diff --git a/ui/src/components/account/flow-viz/types.ts b/ui/src/components/account/flow-viz/types.ts
index 423155b1..a17e3e37 100644
--- a/ui/src/components/account/flow-viz/types.ts
+++ b/ui/src/components/account/flow-viz/types.ts
@@ -2,6 +2,9 @@
  * Type definitions for Account Flow Visualization
  */
 
+/** Account tier for subscription level */
+export type AccountTier = 'free' | 'pro' | 'ultra' | 'unknown';
+
 /** Position offset for draggable cards */
 export interface DragOffset {
   x: number;
@@ -17,6 +20,8 @@ export interface AccountData {
   lastUsedAt?: string;
   color: string;
   paused?: boolean;
+  /** Account tier (Antigravity only) */
+  tier?: AccountTier;
 }
 
 export interface ProviderData {
diff --git a/ui/src/components/monitoring/auth-monitor/hooks.ts b/ui/src/components/monitoring/auth-monitor/hooks.ts
index 4af76b84..14868be5 100644
--- a/ui/src/components/monitoring/auth-monitor/hooks.ts
+++ b/ui/src/components/monitoring/auth-monitor/hooks.ts
@@ -101,6 +101,7 @@ export function useAuthMonitorData(): AuthMonitorData {
           color: ACCOUNT_COLORS[colorIndex % ACCOUNT_COLORS.length],
           projectId: account.projectId,
           paused: account.paused,
+          tier: account.tier,
         };
         accountsList.push(row);
         providerData.accounts.push(row);
diff --git a/ui/src/components/monitoring/auth-monitor/types.ts b/ui/src/components/monitoring/auth-monitor/types.ts
index 1490c134..1ddbf44a 100644
--- a/ui/src/components/monitoring/auth-monitor/types.ts
+++ b/ui/src/components/monitoring/auth-monitor/types.ts
@@ -2,6 +2,9 @@
  * Type definitions for Auth Monitor components
  */
 
+/** Account tier for subscription level */
+export type AccountTier = 'free' | 'pro' | 'ultra' | 'unknown';
+
 export interface AccountRow {
   id: string;
   email: string;
@@ -16,6 +19,8 @@ export interface AccountRow {
   projectId?: string;
   /** Whether account is paused (skipped in quota rotation) */
   paused?: boolean;
+  /** Account tier (Antigravity only) */
+  tier?: AccountTier;
 }
 
 export interface ProviderStats {
diff --git a/ui/src/lib/api-client.ts b/ui/src/lib/api-client.ts
index 77b73065..cf190caa 100644
--- a/ui/src/lib/api-client.ts
+++ b/ui/src/lib/api-client.ts
@@ -83,8 +83,8 @@ export interface OAuthAccount {
   paused?: boolean;
   /** ISO timestamp when account was paused */
   pausedAt?: string;
-  /** Account tier: free or paid (Pro/Ultra combined) */
-  tier?: 'free' | 'paid' | 'unknown';
+  /** Account tier: free, pro, ultra, or unknown */
+  tier?: 'free' | 'pro' | 'ultra' | 'unknown';
   /** GCP Project ID (Antigravity only) - read-only */
   projectId?: string;
 }