diff --git a/src-tauri/src/cloud/client.rs b/src-tauri/src/cloud/client.rs
index 9728e8e..5f5c612 100644
--- a/src-tauri/src/cloud/client.rs
+++ b/src-tauri/src/cloud/client.rs
@@ -1,11 +1,17 @@
 use reqwest::Client;
 use serde::{Deserialize, Serialize};
 
-// The cloud API runs at cloud-api.proofofprints.com. The bare `cloud.`
-// subdomain now hosts the web portal (Cloudflare static assets) and will
-// return 405 Method Not Allowed for any POST that hits it. Don't put the
-// portal URL here — it's a different host with no API routes.
-const CLOUD_API_URL: &str = "https://cloud-api.proofofprints.com";
+// The cloud API runs at cloud-api.overbuildlabs.com. The portal lives on
+// the bare `cloud.` subdomain (Cloudflare static assets) and will return
+// 405 Method Not Allowed for any POST that hits it. Don't put the portal
+// URL here — it's a different host with no API routes.
+//
+// Rebrand 2026-05-22: canonical host moved from cloud-api.proofofprints.com
+// → cloud-api.overbuildlabs.com. The old hostname is still served by the
+// same Caddy site block (both names point at the same Node service) so
+// existing installs on previous builds keep working — but new builds
+// canonicalize on the OverBuild Labs domain.
+const CLOUD_API_URL: &str = "https://cloud-api.overbuildlabs.com";
 
 fn api_url(path: &str) -> String {
     format!("{}{}", CLOUD_API_URL, path)
diff --git a/src-tauri/src/cloud/ws.rs b/src-tauri/src/cloud/ws.rs
index b03c7da..a4ba456 100644
--- a/src-tauri/src/cloud/ws.rs
+++ b/src-tauri/src/cloud/ws.rs
@@ -5,9 +5,11 @@ use tokio_tungstenite::tungstenite::Message;
 
 use super::{command_exec, CloudState, CloudSyncStatus};
 
-// See note in cloud/client.rs — the API host is cloud-api.proofofprints.com,
-// NOT cloud.proofofprints.com (which serves the React portal).
-const WS_URL_BASE: &str = "wss://cloud-api.proofofprints.com/api/v1/ws";
+// See note in cloud/client.rs — the API host is cloud-api.overbuildlabs.com,
+// NOT cloud.overbuildlabs.com (which serves the React portal). Old
+// cloud-api.proofofprints.com still resolves to the same backend via
+// Caddy aliases until the proofofprints.com domain is fully retired.
+const WS_URL_BASE: &str = "wss://cloud-api.overbuildlabs.com/api/v1/ws";
 const PING_INTERVAL_SECS: u64 = 30;
 
 /// Backoff schedule: 5s → 10s → 30s → 60s (cap)
diff --git a/src/pages/MobileMinerDetail.tsx b/src/pages/MobileMinerDetail.tsx
index 87e722c..52f41c7 100644
--- a/src/pages/MobileMinerDetail.tsx
+++ b/src/pages/MobileMinerDetail.tsx
@@ -224,7 +224,7 @@ export default function MobileMinerDetail() {
               value={poolUrl}
               onChange={(e) => setPoolUrl(e.target.value)}
               className="w-full bg-dark-900 border border-slate-600 rounded-lg px-3 py-2 text-white text-sm"
-              placeholder="stratum+tcp://pool.proofofprints.com:5558"
+              placeholder="stratum+tcp://pool.overbuildlabs.com:5558"
             />
           </div>
           <div className="grid grid-cols-2 gap-3">