diff --git a/packages/start/README.md b/packages/start/README.md
index 591a7aa6e..2910444f7 100644
--- a/packages/start/README.md
+++ b/packages/start/README.md
@@ -13,6 +13,7 @@ A set of primitives for Solid Start
 
 - [`createServerCookie`](#createservercookie) - Provides a getter and setter for a reactive cookie, which works isomorphically.
 - [`createUserTheme`](#createusertheme) - Creates a Server Cookie providing a type safe way to store a theme and access it on the server or client.
+- [`useUserAgent`](#useuseragent) - Creates a Server Cookie providing a type safe way to store a theme and access it on the server or client.
 
 ## Installation
 
@@ -66,6 +67,14 @@ const [theme, setTheme] = createUserTheme("cookieName", {
 theme(); // => "light" | "dark"
 ```
 
+## `useUserAgent`
+
+Provides the value of the `userAgent` string isomorphically on the client or server
+
+```ts
+const userAgent: string | null = useUserAgent();
+```
+
 ## Demo
 
 You can view a demo of this primitive here: <https://codesandbox.io/p/sandbox/amazing-easley-wqk38i?file=%2Fsrc%2Fstart_primitive%2Findex.ts%3A36%2C20>
diff --git a/packages/start/dev/index.tsx b/packages/start/dev/index.tsx
index 340378c0f..210f531b0 100644
--- a/packages/start/dev/index.tsx
+++ b/packages/start/dev/index.tsx
@@ -1,8 +1,8 @@
-import { Component, createSignal } from "solid-js";
-
+import { Component } from "solid-js";
+import { createUserTheme } from "../";
 const App: Component = () => {
-  const [count, setCount] = createSignal(0);
-  const increment = () => setCount(count() + 1);
+  const [theme, setTheme] = createUserTheme();
+  const increment = () => setTheme(theme() === "light" ? "dark" : "light");
   return (
     <div class={`min-h-screen ${"dark" == "dark" ? "dark" : ""}`}>
       <div class="box-border flex min-h-screen w-full flex-col items-center justify-center space-y-4 bg-gray-800 p-24 text-white">
@@ -10,7 +10,7 @@ const App: Component = () => {
           <h4>Counter component</h4>
           <p class="caption">it's very important...</p>
           <button class="btn" onClick={increment}>
-            {count()}
+            {theme()}
           </button>
         </div>
       </div>
diff --git a/packages/start/package.json b/packages/start/package.json
index 6325f5ed9..31cfc5c10 100644
--- a/packages/start/package.json
+++ b/packages/start/package.json
@@ -20,7 +20,8 @@
     "stage": 0,
     "list": [
       "createServerCookie",
-      "createUserTheme"
+      "createUserTheme",
+      "useUserAgent"
     ],
     "category": "Solid Start"
   },
diff --git a/packages/start/src/index.ts b/packages/start/src/index.ts
index 259879c0e..55469f9d6 100644
--- a/packages/start/src/index.ts
+++ b/packages/start/src/index.ts
@@ -1,101 +1,3 @@
-import { createSignal, createEffect, Signal } from "solid-js";
-import { isServer } from "solid-js/web";
-import { parseCookie } from "solid-start";
-import { useRequest } from "solid-start/server";
-
-export type MaxAgeOptions = {
-  /**
-   * The maximum age of the cookie in seconds. Defaults to 1 year.
-   */
-  cookieMaxAge?: number;
-};
-
-export type ServerCookieOptions<T = string> = MaxAgeOptions & {
-  /**
-   * A function to deserialize the cookie value to be used as signal value
-   */
-  deserialize?: (str: string | undefined) => T;
-  /**
-   * A function to serialize the signal value to be used as cookie value
-   */
-  serialize?: (value: T) => string;
-};
-
-const YEAR = 365 * 24 * 60 * 60;
-
-/**
- * A primitive for creating a cookie that can be accessed isomorphically on the client, or the server
- *
- * @param name The name of the cookie to be set
- * @param options Options for the cookie {@see ServerCookieOptions}
- * @return Returns an accessor and setter to manage the user's current theme
- */
-export function createServerCookie<T>(
-  name: string,
-  options: ServerCookieOptions<T> & {
-    deserialize: (str: string | undefined) => T;
-    serialize: (value: T) => string;
-  },
-): Signal<T>;
-export function createServerCookie(
-  name: string,
-  options?: ServerCookieOptions,
-): Signal<string | undefined>;
-export function createServerCookie<T>(
-  name: string,
-  options?: ServerCookieOptions<T | undefined>,
-): Signal<T | undefined> {
-  const {
-    deserialize = (v: any) => v as T,
-    serialize = String,
-    cookieMaxAge = YEAR,
-  } = options ?? {};
-
-  const [cookie, setCookie] = createSignal(
-    deserialize(
-      parseCookie(isServer ? useRequest().request.headers.get("cookie") ?? "" : document.cookie)[
-        name
-      ],
-    ),
-  );
-
-  createEffect(p => {
-    const string = serialize(cookie());
-    if (p !== string) document.cookie = `${name}=${string};max-age=${cookieMaxAge}`;
-    return string;
-  });
-
-  return [cookie, setCookie];
-}
-
-export type Theme = "light" | "dark";
-
-export type UserThemeOptions = MaxAgeOptions & {
-  /**
-   * The default theme to be used if the cookie is not set
-   */
-  defaultValue?: Theme;
-};
-
-/**
- * Composes {@link createServerCookie} to provide a type safe way to store a theme and access it on the server or client.
- *
- * @param name The name of the cookie to be set
- * @param options Options for the cookie {@link UserThemeOptions}
- */
-export function createUserTheme(
-  name: string | undefined,
-  options: UserThemeOptions & { defaultValue: Theme },
-): Signal<Theme>;
-export function createUserTheme(
-  name?: string,
-  options?: UserThemeOptions,
-): Signal<Theme | undefined>;
-export function createUserTheme(name = "theme", options?: UserThemeOptions): Signal<any> {
-  const defaultValue = options?.defaultValue;
-  return createServerCookie(name, {
-    ...options,
-    deserialize: str => (str === "light" || str === "dark" ? str : defaultValue),
-    serialize: String,
-  });
-}
+export * from "./serverCookie";
+export * from "./userTheme";
+export * from "./userAgent";
diff --git a/packages/start/src/serverCookie.ts b/packages/start/src/serverCookie.ts
new file mode 100644
index 000000000..598b66fd9
--- /dev/null
+++ b/packages/start/src/serverCookie.ts
@@ -0,0 +1,69 @@
+import { createSignal, createEffect, Signal } from "solid-js";
+import { isServer } from "solid-js/web";
+import { parseCookie } from "solid-start";
+import { useRequest } from "solid-start/server";
+
+export type MaxAgeOptions = {
+  /**
+   * The maximum age of the cookie in seconds. Defaults to 1 year.
+   */
+  cookieMaxAge?: number;
+};
+
+export type ServerCookieOptions<T = string> = MaxAgeOptions & {
+  /**
+   * A function to deserialize the cookie value to be used as signal value
+   */
+  deserialize?: (str: string | undefined) => T;
+  /**
+   * A function to serialize the signal value to be used as cookie value
+   */
+  serialize?: (value: T) => string;
+};
+
+const YEAR = 365 * 24 * 60 * 60;
+
+/**
+ * A primitive for creating a cookie that can be accessed isomorphically on the client, or the server
+ *
+ * @param name The name of the cookie to be set
+ * @param options Options for the cookie {@see ServerCookieOptions}
+ * @return Returns an accessor and setter to manage the user's current theme
+ */
+export function createServerCookie<T>(
+  name: string,
+  options: ServerCookieOptions<T> & {
+    deserialize: (str: string | undefined) => T;
+    serialize: (value: T) => string;
+  },
+): Signal<T>;
+export function createServerCookie(
+  name: string,
+  options?: ServerCookieOptions,
+): Signal<string | undefined>;
+export function createServerCookie<T>(
+  name: string,
+  options?: ServerCookieOptions<T | undefined>,
+): Signal<T | undefined> {
+  const {
+    deserialize = (v: any) => v as T,
+    serialize = String,
+    cookieMaxAge = YEAR,
+  } = options ?? {};
+
+  const [cookie, setCookie] = createSignal(
+    deserialize(
+      parseCookie(isServer ? useRequest().request.headers.get("cookie") ?? "" : document.cookie)[
+        name
+      ],
+    ),
+  );
+
+  createEffect(p => {
+    const string = serialize(cookie());
+    if (p !== string) document.cookie = `${name}=${string};max-age=${cookieMaxAge}`;
+    return string;
+  });
+
+  return [cookie, setCookie];
+}
\ No newline at end of file
diff --git a/packages/start/src/userAgent.ts b/packages/start/src/userAgent.ts
new file mode 100644
index 000000000..ab2b96908
--- /dev/null
+++ b/packages/start/src/userAgent.ts
@@ -0,0 +1,13 @@
+import { useRequest } from "solid-start/server";
+import { isServer } from "solid-js/web";
+/** A primitive that allows for the user agent string to be accessed isomorphically on the client, or on the server
+ * @return Returns the user agent string, or null
+ */
+export function useUserAgent() {
+  const event = useRequest();
+  if (isServer) {
+    const userAgent = event.request.headers.get("user-agent") ?? null;
+    return userAgent;
+  }
+  return navigator.userAgent;
+}
diff --git a/packages/start/src/userTheme.ts b/packages/start/src/userTheme.ts
new file mode 100644
index 000000000..a650499ff
--- /dev/null
+++ b/packages/start/src/userTheme.ts
@@ -0,0 +1,34 @@
+import { Signal } from "solid-js";
+import { MaxAgeOptions, createServerCookie } from "./serverCookie";
+
+export type Theme = "light" | "dark";
+
+export type UserThemeOptions = MaxAgeOptions & {
+  /**
+   * The default theme to be used if the cookie is not set
+   */
+  defaultValue?: Theme;
+};
+
+/**
+ * Composes {@link createServerCookie} to provide a type safe way to store a theme and access it on the server or client.
+ *
+ * @param name The name of the cookie to be set
+ * @param options Options for the cookie {@link UserThemeOptions}
+ */
+export function createUserTheme(
+  name: string | undefined,
+  options: UserThemeOptions & { defaultValue: Theme },
+): Signal<Theme>;
+export function createUserTheme(
+  name?: string,
+  options?: UserThemeOptions,
+): Signal<Theme | undefined>;
+export function createUserTheme(name = "theme", options?: UserThemeOptions): Signal<any> {
+  const defaultValue = options?.defaultValue;
+  return createServerCookie(name, {
+    ...options,
+    deserialize: str => (str === "light" || str === "dark" ? str : defaultValue),
+    serialize: String,
+  });
+}