diff --git a/site/app/(home)/components/leaderboard-table.tsx b/site/app/(home)/components/leaderboard-table.tsx
index 4cf7a90029..d10b1f0d81 100644
--- a/site/app/(home)/components/leaderboard-table.tsx
+++ b/site/app/(home)/components/leaderboard-table.tsx
@@ -1,7 +1,7 @@
 "use client";
 
 import { useState, useMemo, useEffect } from "react";
-import { useRouter, useSearchParams } from "next/navigation";
+import { useRouter } from "next/navigation";
 import { Search, Trophy, ListTree } from "lucide-react";
 import { clsx, type ClassValue } from "clsx";
 import { twMerge } from "tailwind-merge";
@@ -62,10 +62,15 @@ function ScoreCell({ value }: { value: number }) {
 
 export default function LeaderboardTable({ data }: { data: LeaderboardEntry[] }) {
   const router = useRouter();
-  const searchParams = useSearchParams();
-  const devMode = process.env.NODE_ENV === "development" || searchParams.get("dev") === "true";
+  const [devMode, setDevMode] = useState(process.env.NODE_ENV === "development");
   const [searchQuery, setSearchQuery] = useState("");
 
+  useEffect(() => {
+    const isDev = process.env.NODE_ENV === "development" ||
+                  localStorage.getItem("devMode") === "true";
+    setDevMode(isDev);
+  }, []);
+
   const filteredData = useMemo(() => {
     let processedData = data;
     const config = zealtConfig as { pending_models?: string[] };
diff --git a/site/app/tasks/[name]/[jobId]/trajectory/components/trajectory-page.tsx b/site/app/tasks/[name]/[jobId]/trajectory/components/trajectory-page.tsx
index 32092ac0e6..0fab8fc83c 100644
--- a/site/app/tasks/[name]/[jobId]/trajectory/components/trajectory-page.tsx
+++ b/site/app/tasks/[name]/[jobId]/trajectory/components/trajectory-page.tsx
@@ -56,8 +56,14 @@ export function TrajectoryPage({
   const pathname = usePathname();
   const [mounted, setMounted] = useState(false);
   const [iframeLoading, setIframeLoading] = useState(true);
+  const [devModeEnabled, setDevModeEnabled] = useState(process.env.NODE_ENV === "development");
+
+  useEffect(() => {
+    const isDev = process.env.NODE_ENV === "development" || 
+                  localStorage.getItem("devMode") === "true";
+    setDevModeEnabled(isDev);
+  }, []);
 
-  const devModeEnabled = process.env.NODE_ENV === "development" || searchParams.get("dev") === "true";
   const visibleTabsConfig = useMemo(
     () =>
       devModeEnabled
diff --git a/site/app/tasks/components/tasks-page-client.tsx b/site/app/tasks/components/tasks-page-client.tsx
index ecd6b08782..d776db002e 100644
--- a/site/app/tasks/components/tasks-page-client.tsx
+++ b/site/app/tasks/components/tasks-page-client.tsx
@@ -184,7 +184,7 @@ export function TasksPageClient({ tasksData }: TasksPageClientProps) {
     const initialAgents = (params.get("agent") || "").split(",").filter(Boolean);
     const initialSort = params.get("sort") || "default";
     const initialOrder = params.get("order") || "asc";
-    const initialDevMode = process.env.NODE_ENV === "development" || params.get("dev") === "true";
+    const initialDevMode = process.env.NODE_ENV === "development" || localStorage.getItem("devMode") === "true";
 
     setQueryQ(initialQ);
     setSearchQuery(initialQ);