diff --git a/.changeset/extract-fixed-nuxt-error-boundary.md b/.changeset/extract-fixed-nuxt-error-boundary.md
new file mode 100644
index 000000000..8e4955146
--- /dev/null
+++ b/.changeset/extract-fixed-nuxt-error-boundary.md
@@ -0,0 +1,5 @@
+---
+"@effect-app/vue-components": patch
+---
+
+Add `FixedNuxtErrorBoundary`, extracted from duplicated per-project copies. Wraps Nuxt's error boundary with injectable `captureException`/`toastError`/`debug` props, distinguishes supported errors (setup/template) from unsupported ones (native event handlers, reported but not rendered), ignores interrupts-only Effect `CauseException` failures, and clears itself on route change.
diff --git a/packages/vue-components/__tests__/FixedNuxtErrorBoundary.test.ts b/packages/vue-components/__tests__/FixedNuxtErrorBoundary.test.ts
new file mode 100644
index 000000000..2e88b1f55
--- /dev/null
+++ b/packages/vue-components/__tests__/FixedNuxtErrorBoundary.test.ts
@@ -0,0 +1,213 @@
+import { mount } from "@vue/test-utils"
+import { CauseException } from "effect-app/client"
+import * as Cause from "effect/Cause"
+import { afterEach, beforeEach, describe, expect, it, vi } from "vitest"
+import { defineComponent, h, nextTick, onErrorCaptured, ref } from "vue"
+import { createMemoryHistory, createRouter, type Router } from "vue-router"
+import FixedNuxtErrorBoundary from "../src/components/FixedNuxtErrorBoundary.vue"
+
+/**
+ * Behavior contract of the shared error boundary (extracted from the two
+ * app-local copies — this pins the "no behavior change" claim of the dedup):
+ *  - a supported error (e.g. thrown in setup) renders the error slot and
+ *    emits "error"; it is NOT reported via captureException
+ *  - an unsupported error (e.g. native event handler) is reported via
+ *    captureException (+ toast when debug) and does NOT take over the page
+ *  - an interrupts-only Effect CauseException is ignored entirely
+ *  - a route change clears the error state
+ *  - scheduleAfterReady defers handling (backend hydration path)
+ *  - enabled=false registers no handler, so errors propagate to the parent
+ */
+
+const noopWarn = () => {}
+
+// Throws in setup only while `active` is true — a supported error ("setup
+// function"), and togglable so the route-change test can stop re-throwing.
+const makeThrowingChild = (active: { value: boolean }, err: unknown) =>
+  defineComponent({
+    name: "ThrowingChild",
+    setup() {
+      if (active.value) throw err
+      return () => h("div", { id: "child-ok" }, "ok")
+    }
+  })
+
+// Throws from a native click handler — an unsupported error info.
+const ClickThrowChild = defineComponent({
+  name: "ClickThrowChild",
+  setup() {
+    return () =>
+      h("button", {
+        id: "boom",
+        onClick: () => {
+          throw new Error("click boom")
+        }
+      }, "boom")
+  }
+})
+
+const makeRouter = () =>
+  createRouter({
+    history: createMemoryHistory(),
+    routes: [
+      { path: "/", component: { render: () => null } },
+      { path: "/other", component: { render: () => null } }
+    ]
+  })
+
+describe("FixedNuxtErrorBoundary", () => {
+  let captureException: ReturnType<typeof vi.fn>
+  let toastError: ReturnType<typeof vi.fn>
+  let router: Router
+  let warnSpy: ReturnType<typeof vi.spyOn>
+
+  beforeEach(() => {
+    captureException = vi.fn()
+    toastError = vi.fn()
+    router = makeRouter()
+    warnSpy = vi.spyOn(console, "warn").mockImplementation(noopWarn)
+  })
+
+  afterEach(() => {
+    warnSpy.mockRestore()
+  })
+
+  // Mount through a host component that renders the boundary with its slots,
+  // mirroring real usage (Suspender wraps it). Mounting the boundary directly
+  // as the test root breaks error propagation into its own onErrorCaptured.
+  const mountBoundary = (
+    child: ReturnType<typeof defineComponent>,
+    props: Record<string, unknown> = {}
+  ) => {
+    const emitted: Error[] = []
+    const Host = defineComponent({
+      name: "Host",
+      setup() {
+        return () =>
+          h(FixedNuxtErrorBoundary, {
+            captureException,
+            toastError,
+            debug: true,
+            onError: (e: Error) => emitted.push(e),
+            ...props
+          }, {
+            default: () => h(child),
+            error: (params: { error: Error; clearError: () => void }) =>
+              h("div", { id: "error-slot" }, params.error.message)
+          })
+      }
+    })
+    const wrapper = mount(Host, { global: { plugins: [router] } })
+    return { wrapper, emitted }
+  }
+
+  it("renders the error slot and emits on a supported (setup) error, without reporting it", async () => {
+    const active = ref(true)
+    const { emitted, wrapper } = mountBoundary(makeThrowingChild(active, new Error("setup boom")))
+    await nextTick()
+
+    expect(wrapper.find("#error-slot").exists()).toBe(true)
+    expect(wrapper.find("#error-slot").text()).toBe("setup boom")
+    expect(emitted).toHaveLength(1)
+    expect(captureException).not.toHaveBeenCalled()
+    expect(warnSpy).toHaveBeenCalled()
+  })
+
+  it("reports an unsupported (native handler) error via captureException + toast, without taking over the page", async () => {
+    const { emitted, wrapper } = mountBoundary(ClickThrowChild)
+    await wrapper.find("#boom").trigger("click")
+    await nextTick()
+
+    expect(captureException).toHaveBeenCalledTimes(1)
+    expect(captureException.mock.calls[0][0]).toBeInstanceOf(Error)
+    expect(toastError).toHaveBeenCalledWith("An unexpected error has occurred: Error: click boom")
+    expect(wrapper.find("#error-slot").exists()).toBe(false)
+    expect(emitted).toHaveLength(0)
+  })
+
+  it("does not toast an unsupported error when debug is off", async () => {
+    const { wrapper } = mountBoundary(ClickThrowChild, { debug: false })
+    await wrapper.find("#boom").trigger("click")
+
+    expect(captureException).toHaveBeenCalledTimes(1)
+    expect(toastError).not.toHaveBeenCalled()
+  })
+
+  it("ignores an interrupts-only Effect CauseException", async () => {
+    const interrupted = new CauseException(Cause.interrupt(), "Interrupted")
+    const { emitted, wrapper } = mountBoundary(makeThrowingChild(ref(true), interrupted))
+    await nextTick()
+
+    expect(wrapper.find("#error-slot").exists()).toBe(false)
+    expect(emitted).toHaveLength(0)
+    expect(captureException).not.toHaveBeenCalled()
+  })
+
+  it("clears the error on route change", async () => {
+    const active = ref(true)
+    const { wrapper } = mountBoundary(makeThrowingChild(active, new Error("boom")))
+    await nextTick()
+    expect(wrapper.find("#error-slot").exists()).toBe(true)
+
+    active.value = false
+    await router.push("/other")
+    await nextTick()
+
+    expect(wrapper.find("#error-slot").exists()).toBe(false)
+    expect(wrapper.find("#child-ok").exists()).toBe(true)
+  })
+
+  it("defers handling through scheduleAfterReady when provided", async () => {
+    const queue: (() => void)[] = []
+    const { wrapper } = mountBoundary(makeThrowingChild(ref(true), new Error("deferred boom")), {
+      scheduleAfterReady: (fn: () => void) => queue.push(fn)
+    })
+    await nextTick()
+
+    expect(wrapper.find("#error-slot").exists()).toBe(false)
+    expect(queue).toHaveLength(1)
+
+    queue.forEach((fn) => fn())
+    await nextTick()
+    expect(wrapper.find("#error-slot").text()).toBe("deferred boom")
+  })
+
+  it("calls onHandled after emitting, before rendering the error slot", async () => {
+    const onHandled = vi.fn()
+    const { wrapper } = mountBoundary(makeThrowingChild(ref(true), new Error("hooked boom")), { onHandled })
+    await nextTick()
+
+    expect(onHandled).toHaveBeenCalledTimes(1)
+    expect(onHandled.mock.calls[0][0]).toBeInstanceOf(Error)
+    expect(onHandled.mock.calls[0][2]).toBe("setup function")
+    expect(wrapper.find("#error-slot").exists()).toBe(true)
+  })
+
+  it("registers no handler when enabled is false, letting the error propagate", async () => {
+    const parentCaught = vi.fn()
+    const Host = defineComponent({
+      name: "Host",
+      setup() {
+        onErrorCaptured((err) => {
+          parentCaught(err)
+          return false
+        })
+        return () =>
+          h(FixedNuxtErrorBoundary, {
+            captureException,
+            toastError,
+            debug: true,
+            enabled: false
+          }, {
+            default: () => h(makeThrowingChild(ref(true), new Error("escaped boom"))),
+            error: () => h("div", { id: "error-slot" })
+          })
+      }
+    })
+    const wrapper = mount(Host, { global: { plugins: [router] } })
+    await nextTick()
+
+    expect(parentCaught).toHaveBeenCalledTimes(1)
+    expect(wrapper.find("#error-slot").exists()).toBe(false)
+  })
+})
diff --git a/packages/vue-components/package.json b/packages/vue-components/package.json
index bf961ddd5..7d882dace 100644
--- a/packages/vue-components/package.json
+++ b/packages/vue-components/package.json
@@ -27,6 +27,7 @@
     "primeicons": "^7.0.0",
     "primevue": "^4.5.5",
     "vue": "^3.5.35",
+    "vue-router": "^5.1.0",
     "vuetify": "^4.0.8"
   },
   "devDependencies": {
diff --git a/packages/vue-components/src/components/FixedNuxtErrorBoundary.vue b/packages/vue-components/src/components/FixedNuxtErrorBoundary.vue
new file mode 100644
index 000000000..3a2f6ab7a
--- /dev/null
+++ b/packages/vue-components/src/components/FixedNuxtErrorBoundary.vue
@@ -0,0 +1,104 @@
+<script setup lang="ts">
+import { CauseException } from "effect-app/client"
+import * as Cause from "effect/Cause"
+import { onErrorCaptured, shallowRef } from "vue"
+import { useRouter } from "vue-router"
+
+// withDefaults, NOT `props.enabled ?? true`: Vue's boolean casting resolves an
+// ABSENT boolean prop to `false`, so the `??` fallback would never fire and an
+// omitted `enabled` (the frontend case) would silently disable the boundary.
+const props = withDefaults(
+  defineProps<{
+    captureException: (err: Error, hint?: { extra?: Record<string, unknown> }) => void
+    toastError: (message: string) => void
+    debug: boolean
+    /** register the boundary only when true (backend passes import.meta.client; frontend omits → true) */
+    enabled?: boolean
+    /** defer handling until app ready (backend: onNuxtReady while hydrating; frontend: omit → run now) */
+    scheduleAfterReady?: (fn: () => void) => void
+    /** extra side-effect after emit, before error.value is set (backend: nuxtApp vue:error hook) */
+    onHandled?: (err: Error, instance: unknown, info: string) => void
+  }>(),
+  { enabled: true }
+)
+
+defineOptions({ name: "NuxtErrorBoundary", inheritAttrs: false })
+
+const emit = defineEmits<{ error: [error: Error] }>()
+
+defineSlots<{
+  // eslint-disable-next-line @typescript-eslint/no-explicit-any
+  error(props: { error: Error; clearError: () => void }): any
+  // eslint-disable-next-line @typescript-eslint/no-explicit-any
+  default(): any
+}>()
+
+const error = shallowRef<Error | null>(null)
+function clearError() {
+  error.value = null
+}
+
+// lol in production these are different...
+const supportedErrors = ["https://vuejs.org/error-reference/#runtime-0", 0, "0", "setup function"]
+
+function handleError(...args: Parameters<Parameters<typeof onErrorCaptured<Error>>[0]>) {
+  const [err, instance, info] = args
+  const fiberFailure = err instanceof CauseException ? err : null
+  // PRO: log that we hit the error boundary
+  console.warn(
+    "NuxtErrorBoundary caught error in " + info + ": " + (fiberFailure ? "CauseException" : "classic error"),
+    fiberFailure ? Cause.pretty(fiberFailure.originalCause) : err,
+    instance
+  )
+
+  // PRO: we don't handle native event handlers the same way we handle setup errors,
+  // because these errors should only get reported, not take over the page.
+  if (!supportedErrors.includes(info)) {
+    props.captureException(err, { extra: { info, instance } })
+    if (props.debug) {
+      props.toastError("An unexpected error has occurred: " + err.toString())
+    }
+    return
+  }
+
+  // PRO: don't render interruptions..
+  // e.g when we run useSuspenseQuery, and we navigate away before a query is finished, we get a CancelledError
+  // if we however render it here instead of the default slot, we will show the cancellation error of the previous page, instead of rendering the new page
+  if (fiberFailure && Cause.hasInterruptsOnly(fiberFailure.originalCause)) {
+    return
+  }
+
+  emit("error", err)
+  props.onHandled?.(err, instance, info)
+  error.value = err
+}
+
+if (props.enabled) {
+  onErrorCaptured((err, instance, info) => {
+    if (props.scheduleAfterReady) props.scheduleAfterReady(() => handleError(err, instance, info))
+    else handleError(err, instance, info)
+    return false
+  })
+}
+
+// PRO: fix error not clearing after route change: https://github.com/nuxt/nuxt/issues/15781#issuecomment-2320928163
+const router = useRouter()
+router.afterEach(() => {
+  clearError()
+})
+
+defineExpose({ error, clearError })
+</script>
+
+<template>
+  <slot
+    v-if="error"
+    v-bind="{ error, clearError }"
+    name="error"
+  />
+
+  <slot
+    v-else
+    name="default"
+  />
+</template>
diff --git a/packages/vue-components/src/components/index.ts b/packages/vue-components/src/components/index.ts
index d773b893e..1dea2b91e 100644
--- a/packages/vue-components/src/components/index.ts
+++ b/packages/vue-components/src/components/index.ts
@@ -1,3 +1,4 @@
 export { default as CommandButton } from "./CommandButton.vue"
 export { default as Dialog } from "./Dialog.vue"
+export { default as FixedNuxtErrorBoundary } from "./FixedNuxtErrorBoundary.vue"
 export * from "./OmegaForm"
diff --git a/packages/vue-components/stories/FixedNuxtErrorBoundary.stories.ts b/packages/vue-components/stories/FixedNuxtErrorBoundary.stories.ts
new file mode 100644
index 000000000..dc6a21991
--- /dev/null
+++ b/packages/vue-components/stories/FixedNuxtErrorBoundary.stories.ts
@@ -0,0 +1,18 @@
+import type { Meta as StoryMeta, StoryObj } from "@storybook/vue3"
+import { vueRouter } from "storybook-vue3-router"
+import Demo from "./FixedNuxtErrorBoundary/Demo.vue"
+
+const meta: StoryMeta = {
+  title: "Components/FixedNuxtErrorBoundary"
+}
+
+export default meta
+type Story = StoryObj<typeof meta>
+
+export const Default: Story = {
+  decorators: [vueRouter()],
+  render: () => ({
+    components: { Demo },
+    template: "<Demo />"
+  })
+}
diff --git a/packages/vue-components/stories/FixedNuxtErrorBoundary/Demo.vue b/packages/vue-components/stories/FixedNuxtErrorBoundary/Demo.vue
new file mode 100644
index 000000000..d7f8c5550
--- /dev/null
+++ b/packages/vue-components/stories/FixedNuxtErrorBoundary/Demo.vue
@@ -0,0 +1,92 @@
+<template>
+  <div style="font-family: sans-serif; padding: 16px">
+    <h2>FixedNuxtErrorBoundary demo</h2>
+    <p>Trigger different error types and watch how the boundary reacts.</p>
+
+    <div style="display: flex; gap: 8px; margin-bottom: 16px">
+      <button @click="setupError = true">
+        Throw in setup() (supported)
+      </button>
+      <button @click="clickError = true">
+        Throw from click handler (unsupported)
+      </button>
+      <button @click="reset">
+        Reset demo
+      </button>
+    </div>
+
+    <FixedNuxtErrorBoundary
+      :capture-exception="captureException"
+      :toast-error="toastError"
+      :debug="true"
+    >
+      <template #error="{ error, clearError }">
+        <div style="border: 2px solid #d33; padding: 12px">
+          <strong>Error boundary caught:</strong> {{ error.message }}
+          <div>
+            <button
+              @click="() => {
+                setupError = false
+                clearError()
+              }"
+            >
+              Clear error
+            </button>
+          </div>
+        </div>
+      </template>
+      <div style="border: 2px solid #2a2; padding: 12px">
+        Page content is alive.
+        <ThrowingChild v-if="setupError" />
+        <ClickThrowChild v-if="clickError" />
+      </div>
+    </FixedNuxtErrorBoundary>
+
+    <h3>Log</h3>
+    <ul>
+      <li v-for="(l, i) in log" :key="i">
+        {{ l }}
+      </li>
+    </ul>
+  </div>
+</template>
+
+<script setup lang="ts">
+import { defineComponent, h, ref } from "vue"
+import FixedNuxtErrorBoundary from "../../src/components/FixedNuxtErrorBoundary.vue"
+
+const setupError = ref(false)
+const clickError = ref(false)
+const log = ref<string[]>([])
+
+const ThrowingChild = defineComponent({
+  name: "ThrowingChild",
+  setup() {
+    throw new Error("Thrown from setup()")
+  }
+})
+
+const ClickThrowChild = defineComponent({
+  name: "ClickThrowChild",
+  setup() {
+    return () =>
+      h("button", {
+        onClick: () => {
+          throw new Error("Thrown from click handler")
+        }
+      }, "trigger click error")
+  }
+})
+
+function captureException(err: Error) {
+  log.value.unshift(`captureException: ${err.message}`)
+}
+function toastError(message: string) {
+  log.value.unshift(`toast: ${message}`)
+}
+function reset() {
+  setupError.value = false
+  clickError.value = false
+  log.value = []
+}
+</script>