diff --git a/index.html b/index.html
index 4835529..a01653b 100644
--- a/index.html
+++ b/index.html
@@ -38,9 +38,69 @@
         />
         <link rel="apple-touch-icon" href="/images/icon.png" sizes="512x512" />
         <link rel="mask-icon" href="/mutiny_logo_mask.svg" color="#000" />
+        <style>
+            #no-wasm {
+                display: none;
+            }
+
+            #no-wasm,
+            #no-script {
+                margin: 1rem;
+            }
+        </style>
     </head>
     <body>
-        <!---->
+        <div id="no-wasm">
+            <p>
+                <img
+                    src="/mutiny-pixel-logo.png"
+                    width="75px"
+                    alt="Mutiny Wallet"
+                />
+            </p>
+            <p>
+                Your browser does not support WebAssembly, or it's disabled.
+                Please update or enable WebAssembly to run this app.
+            </p>
+            <p>
+                If you're running iOS in lockdown mode you'll need to <a href="https://support.apple.com/en-us/HT212650">add an
+                exception for Mutiny Wallet.</a>
+            </p>
+        </div>
+        <noscript>
+            <div id="no-script">
+                <p>
+                    <img
+                        src="/mutiny-pixel-logo.png"
+                        width="75px"
+                        alt="Mutiny Wallet"
+                    />
+                </p>
+                <p>
+                    Mutiny is a self-custodial wallet that runs in the browser.
+                    JavaScript must be enabled.
+                </p>
+            </div>
+        </noscript>
         <script type="module" async src="./src/entry-client.tsx"></script>
+        <script>
+            // Check for WebAssembly support
+            if (
+                typeof WebAssembly === "object" &&
+                typeof WebAssembly.instantiate === "function"
+            ) {
+                var module = new WebAssembly.Module(
+                    new Uint8Array([0, 97, 115, 109, 1, 0, 0, 0])
+                ); // This is an empty wasm module
+                if (
+                    WebAssembly.Module instanceof Function &&
+                    module instanceof WebAssembly.Module
+                )
+                    console.log("WebAssembly is supported");
+                else document.getElementById("no-wasm").style.display = "block";
+            } else {
+                document.getElementById("no-wasm").style.display = "block";
+            }
+        </script>
     </body>
 </html>
diff --git a/public/mutiny-pixel-logo.png b/public/mutiny-pixel-logo.png
new file mode 100644
index 0000000..a79a2b4
Binary files /dev/null and b/public/mutiny-pixel-logo.png differ
