diff --git a/.changeset/modern-badgers-flash.md b/.changeset/modern-badgers-flash.md
new file mode 100644
index 00000000000..af8abba16f9
--- /dev/null
+++ b/.changeset/modern-badgers-flash.md
@@ -0,0 +1,5 @@
+---
+"@clerk/clerk-js": patch
+---
+
+Add development mode warning in the browser console when `load()` happens. Companion PR for [Add dev mode warning to components](https://github.com/clerk/javascript/pull/3870).
diff --git a/packages/clerk-js/src/core/clerk.ts b/packages/clerk-js/src/core/clerk.ts
index 4b0ca388918..ac4b6a44a54 100644
--- a/packages/clerk-js/src/core/clerk.ts
+++ b/packages/clerk-js/src/core/clerk.ts
@@ -14,6 +14,7 @@ import {
   proxyUrlToAbsoluteURL,
   stripScheme,
 } from '@clerk/shared';
+import { logger } from '@clerk/shared/logger';
 import { eventPrebuiltComponentMounted, TelemetryCollector } from '@clerk/shared/telemetry';
 import type {
   ActiveSessionResource,
@@ -271,6 +272,13 @@ export class Clerk implements ClerkInterface {
       return;
     }
 
+    // Log a development mode warning once
+    if (this.#instanceType === 'development') {
+      logger.warnOnce(
+        'Clerk: Clerk has been loaded with development keys. Development instances have strict usage limits and should not be used when deploying your application to production. Learn more: https://clerk.com/docs/deployments/overview',
+      );
+    }
+
     this.#options = {
       ...defaultOptions,
       ...options,
diff --git a/packages/clerk-js/src/utils/assertNoLegacyProp.ts b/packages/clerk-js/src/utils/assertNoLegacyProp.ts
index 50a51d04e56..a574b8d9e2f 100644
--- a/packages/clerk-js/src/utils/assertNoLegacyProp.ts
+++ b/packages/clerk-js/src/utils/assertNoLegacyProp.ts
@@ -5,9 +5,8 @@ export function assertNoLegacyProp(props: Record<string, any>) {
   const legacyProp = Object.keys(props).find(key => legacyProps.includes(key));
 
   if (legacyProp && props[legacyProp]) {
-    // TODO: @nikos update with the docs link
     logger.warnOnce(
-      `Clerk: The prop "${legacyProp}" is deprecated and should be replaced with the new "fallbackRedirectUrl" or "forceRedirectUrl" props instead.`,
+      `Clerk: The prop "${legacyProp}" is deprecated and should be replaced with the new "fallbackRedirectUrl" or "forceRedirectUrl" props instead. Learn more: https://clerk.com/docs/guides/custom-redirects#redirect-url-props`,
     );
   }
 }
@@ -19,9 +18,8 @@ export function warnForNewPropShadowingLegacyProp(
   legacyValue: string | undefined | null,
 ) {
   if (newValue && legacyValue) {
-    // TODO: @nikos update with the docs link
     logger.warnOnce(
-      `Clerk: The "${newKey}" prop ("${newValue}") has priority over the legacy "${legacyKey}" (or "redirectUrl") ("${legacyValue}"), which will be completely ignored in this case. "${legacyKey}" (or "redirectUrl" prop) should be replaced with the new "fallbackRedirectUrl" or "forceRedirectUrl" props instead.`,
+      `Clerk: The "${newKey}" prop ("${newValue}") has priority over the legacy "${legacyKey}" (or "redirectUrl") ("${legacyValue}"), which will be completely ignored in this case. "${legacyKey}" (or "redirectUrl" prop) should be replaced with the new "fallbackRedirectUrl" or "forceRedirectUrl" props instead. Learn more: https://clerk.com/docs/guides/custom-redirects#redirect-url-props`,
     );
   }
 }