diff --git a/src/App.vue b/src/App.vue
index c3670ec..ccc382a 100644
--- a/src/App.vue
+++ b/src/App.vue
@@ -3,6 +3,7 @@ import {computed} from 'vue';
 import {RouterView, useRoute} from 'vue-router';
 import {Sidebar} from './sidebar';
 import {ConfirmModal} from '@/confirm';
+import {ToastContainer} from '@/toast';
 import {routeNames} from '@/routes';
 
 const route = useRoute();
@@ -23,6 +24,7 @@ const hideSidebar = computed(() => {
         </div>
     </template>
     <ConfirmModal />
+    <ToastContainer />
 </template>
 
 <style scoped>
diff --git a/src/pages/rules/EditRuleBook.vue b/src/pages/rules/EditRuleBook.vue
index 2ca61f0..a7c0239 100644
--- a/src/pages/rules/EditRuleBook.vue
+++ b/src/pages/rules/EditRuleBook.vue
@@ -5,6 +5,7 @@ import log from "loglevel";
 import {ScriptEditor, useRuleBookStore} from "@/rules";
 import {PlusIcon, TrashIcon} from "@heroicons/vue/24/outline";
 import {isMain, Ledger, LedgerSelect, systemLedger, useLedgersStore} from "@/ledger";
+import {toast} from "@/toast";
 
 type Binding = { ref: string; ledger: Ledger };
 
@@ -42,7 +43,9 @@ const save = () => ruleBookStore.update({
           .map(b => [b.ref, b.ledger.ledgerId])
   ),
   script: script.value
-});
+})
+    .then(() => toast.success('Rule book saved'))
+    .catch(() => toast.error('Failed to save rule book'));
 
 useEventListener(window, 'keydown', (event: KeyboardEvent) => {
   if ((event.metaKey || event.ctrlKey) && event.key.toLowerCase() === 's') {
diff --git a/src/toast/ToastContainer.vue b/src/toast/ToastContainer.vue
new file mode 100644
index 0000000..41304bd
--- /dev/null
+++ b/src/toast/ToastContainer.vue
@@ -0,0 +1,94 @@
+<script setup lang="ts">
+import {
+  CheckCircleIcon,
+  InformationCircleIcon,
+  XCircleIcon,
+  XMarkIcon,
+} from '@heroicons/vue/24/outline';
+import type {ToastType} from './useToast';
+import {useToastStore} from './useToast';
+
+const toastStore = useToastStore();
+
+const icons = {
+  success: CheckCircleIcon,
+  error: XCircleIcon,
+  info: InformationCircleIcon,
+} as const;
+
+const accent = (type: ToastType) => `accent-${type}`;
+</script>
+
+<template>
+  <div class="toast-container">
+    <TransitionGroup name="toast">
+      <div v-for="toast in toastStore.toasts" :key="toast.id" class="toast" :class="accent(toast.type)">
+        <component :is="icons[toast.type]" class="icon" />
+        <div class="body">
+          <span v-if="toast.title" class="title">{{ toast.title }}</span>
+          <span class="message">{{ toast.message }}</span>
+        </div>
+        <button class="btn-icon close" @click="toastStore.dismiss(toast.id)">
+          <XMarkIcon />
+        </button>
+      </div>
+    </TransitionGroup>
+  </div>
+</template>
+
+<style scoped>
+@reference "@/style.css";
+
+div.toast-container {
+  @apply fixed top-4 right-4 z-50 flex flex-col gap-2 w-80 max-w-[calc(100vw-2rem)];
+}
+
+div.toast {
+  @apply flex items-start gap-2 p-3 rounded bg-slate-700 border-l-4 shadow-lg;
+
+  &.accent-success {
+    @apply border-emerald-500;
+    > .icon { @apply text-emerald-500; }
+  }
+  &.accent-error {
+    @apply border-amber-700;
+    > .icon { @apply text-amber-700; }
+  }
+  &.accent-info {
+    @apply border-sky-600;
+    > .icon { @apply text-sky-600; }
+  }
+
+  > .icon {
+    @apply w-6 h-6 shrink-0;
+  }
+
+  > .body {
+    @apply flex flex-col grow min-w-0;
+
+    > .title {
+      @apply font-semibold;
+    }
+    > .message {
+      @apply break-words;
+    }
+  }
+
+  > .close {
+    @apply shrink-0;
+  }
+}
+
+.toast-enter-active,
+.toast-leave-active,
+.toast-move {
+  @apply transition-all duration-300;
+}
+.toast-enter-from,
+.toast-leave-to {
+  @apply opacity-0 translate-x-8;
+}
+.toast-leave-active {
+  @apply absolute w-full;
+}
+</style>
diff --git a/src/toast/index.ts b/src/toast/index.ts
new file mode 100644
index 0000000..f746706
--- /dev/null
+++ b/src/toast/index.ts
@@ -0,0 +1,3 @@
+export { default as ToastContainer } from './ToastContainer.vue';
+export { toast, useToastStore } from './useToast';
+export type { ToastOptions, ToastType } from './useToast';
diff --git a/src/toast/useToast.ts b/src/toast/useToast.ts
new file mode 100644
index 0000000..8bd45d8
--- /dev/null
+++ b/src/toast/useToast.ts
@@ -0,0 +1,63 @@
+import {defineStore} from "pinia";
+import {ref} from "vue";
+
+export type ToastType = 'success' | 'error' | 'info';
+
+export interface ToastOptions {
+    message: string;
+    title?: string;
+    type?: ToastType;
+    duration?: number;
+}
+
+export interface Toast {
+    id: number;
+    message: string;
+    title?: string;
+    type: ToastType;
+}
+
+const DEFAULT_DURATION = 5000;
+
+export const useToastStore = defineStore('toast', () => {
+    const toasts = ref<Toast[]>([]);
+    let nextId = 0;
+
+    const dismiss = (id: number) => {
+        toasts.value = toasts.value.filter(toast => toast.id !== id);
+    };
+
+    const push = (opts: ToastOptions | string): number => {
+        const options = typeof opts === "string" ? {message: opts} : opts;
+        const id = nextId++;
+        toasts.value.push({
+            id,
+            message: options.message,
+            title: options.title,
+            type: options.type ?? 'info',
+        });
+        const duration = options.duration ?? DEFAULT_DURATION;
+        if (duration > 0) {
+            setTimeout(() => dismiss(id), duration);
+        }
+        return id;
+    };
+
+    return {toasts, push, dismiss};
+});
+
+interface ToastHelper {
+    (opts: ToastOptions | string): number;
+    success: (message: string) => number;
+    error: (message: string) => number;
+    info: (message: string) => number;
+}
+
+export const toast: ToastHelper = Object.assign(
+    (opts: ToastOptions | string): number => useToastStore().push(opts),
+    {
+        success: (message: string): number => useToastStore().push({message, type: 'success'}),
+        error: (message: string): number => useToastStore().push({message, type: 'error'}),
+        info: (message: string): number => useToastStore().push({message, type: 'info'}),
+    },
+);