diff --git a/packages/app/src/Element/Event/NoteCreator.tsx b/packages/app/src/Element/Event/NoteCreator.tsx
index 49e0273ed..4b2612b94 100644
--- a/packages/app/src/Element/Event/NoteCreator.tsx
+++ b/packages/app/src/Element/Event/NoteCreator.tsx
@@ -13,7 +13,7 @@ import Note from "Element/Event/Note";
 
 import { ClipboardEventHandler } from "react";
 import useLogin from "Hooks/useLogin";
-import { WasmPowWorker } from "index";
+import { GetPowWorker } from "index";
 import AsyncButton from "Element/AsyncButton";
 import { AsyncIcon } from "Element/AsyncIcon";
 import { fetchNip05Pubkey } from "@snort/shared";
@@ -25,7 +25,7 @@ export function NoteCreator() {
   const { formatMessage } = useIntl();
   const uploader = useFileUpload();
   const login = useLogin(s => ({ relays: s.relays, publicKey: s.publicKey, pow: s.preferences.pow }));
-  const publisher = login.pow ? useEventPublisher()?.pow(login.pow, new WasmPowWorker()) : useEventPublisher();
+  const publisher = login.pow ? useEventPublisher()?.pow(login.pow, GetPowWorker()) : useEventPublisher();
   const note = useNoteCreator();
   const relays = login.relays;
 
diff --git a/packages/app/src/Element/PinPrompt.tsx b/packages/app/src/Element/PinPrompt.tsx
index fa8d5e2ef..129a1230a 100644
--- a/packages/app/src/Element/PinPrompt.tsx
+++ b/packages/app/src/Element/PinPrompt.tsx
@@ -9,7 +9,7 @@ import useEventPublisher from "Hooks/useEventPublisher";
 import { LoginStore, createPublisher, sessionNeedsPin } from "Login";
 import Modal from "./Modal";
 import AsyncButton from "./AsyncButton";
-import { WasmPowWorker } from "index";
+import { GetPowWorker } from "index";
 
 export function PinPrompt({
   onResult,
@@ -101,7 +101,7 @@ export function LoginUnlock() {
 
     const pub = EventPublisher.privateKey(k);
     if (login.preferences.pow) {
-      pub.pow(login.preferences.pow, new WasmPowWorker());
+      pub.pow(login.preferences.pow, GetPowWorker());
     }
     LoginStore.setPublisher(login.id, pub);
     LoginStore.updateSession({
@@ -118,7 +118,7 @@ export function LoginUnlock() {
     const pub = createPublisher(login);
     if (pub) {
       if (login.preferences.pow) {
-        pub.pow(login.preferences.pow, new WasmPowWorker());
+        pub.pow(login.preferences.pow, GetPowWorker());
       }
       LoginStore.setPublisher(login.id, pub);
       LoginStore.updateSession({
diff --git a/packages/app/src/chat/nip24.ts b/packages/app/src/chat/nip24.ts
index 9f32adf43..5cd64524d 100644
--- a/packages/app/src/chat/nip24.ts
+++ b/packages/app/src/chat/nip24.ts
@@ -3,7 +3,7 @@ import { EventKind, NostrPrefix, encodeTLVEntries, TLVEntryType, TLVEntry, decod
 import { GiftWrapCache } from "Cache/GiftWrapCache";
 import { UnwrappedGift } from "Db";
 import { Chat, ChatSystem, ChatType, lastReadInChat } from "chat";
-import { WasmPowWorker } from "index";
+import { GetPowWorker } from "index";
 
 export class Nip24ChatSystem extends ExternalStore<Array<Chat>> implements ChatSystem {
   #cache: GiftWrapCache;
@@ -105,9 +105,7 @@ export class Nip24ChatSystem extends ExternalStore<Array<Chat>> implements ChatS
           const recvSealedN = pub.giftWrap(await pub.sealRumor(gossip, pt.id), pt.id, powTarget);
           messages.push(recvSealedN);
         }
-        messages.push(
-          pub.giftWrap(await pub.sealRumor(gossip, pub.pubKey), pub.pubKey, powTarget, new WasmPowWorker()),
-        );
+        messages.push(pub.giftWrap(await pub.sealRumor(gossip, pub.pubKey), pub.pubKey, powTarget, GetPowWorker()));
         return await Promise.all(messages);
       },
       sendMessage: (ev, system) => {
diff --git a/packages/app/src/index.tsx b/packages/app/src/index.tsx
index dca895ecf..efb36dad7 100644
--- a/packages/app/src/index.tsx
+++ b/packages/app/src/index.tsx
@@ -17,6 +17,7 @@ import {
   PowMiner,
   NostrEvent,
   mapEventToProfile,
+  PowWorker,
 } from "@snort/system";
 import { SnortContext } from "@snort/system-react";
 
@@ -71,6 +72,10 @@ export class WasmPowWorker implements PowMiner {
   }
 }
 
+const hasWasm = "WebAssembly" in globalThis;
+const DefaultPowWorker = hasWasm ? undefined : new PowWorker("/pow.js");
+export const GetPowWorker = () => (hasWasm ? new WasmPowWorker() : unwrap(DefaultPowWorker));
+
 /**
  * Singleton nostr system
  */
@@ -78,7 +83,7 @@ export const System = new NostrSystem({
   relayCache: UserRelays,
   profileCache: UserCache,
   relayMetrics: RelayMetrics,
-  queryOptimizer: WasmQueryOptimizer,
+  queryOptimizer: hasWasm ? WasmQueryOptimizer : undefined,
   db: SystemDb,
   authHandler: async (c, r) => {
     const { id } = LoginStore.snapshot();
@@ -120,7 +125,9 @@ export const ProfileLoader = new ProfileLoaderService(System, UserCache);
 serviceWorkerRegistration.register();
 
 async function initSite() {
-  await wasmInit(WasmPath);
+  if (hasWasm) {
+    await wasmInit(WasmPath);
+  }
   const login = LoginStore.takeSnapshot();
   db.ready = await db.isAvailable();
   if (db.ready) {