diff --git a/packages/docs/src/components/examples/akumatus-filter-builder.tsx b/packages/docs/src/components/examples/akumatus-filter-builder.tsx
new file mode 100644
index 0000000..c7e264a
--- /dev/null
+++ b/packages/docs/src/components/examples/akumatus-filter-builder.tsx
@@ -0,0 +1,172 @@
+import {
+  createFilterTheme,
+  FilterBuilder,
+  FilterSphereProvider,
+  useFilterGroup,
+  useFilterRule,
+  useFilterSphere,
+  useView,
+} from "@fn-sphere/filter";
+import { z } from "zod";
+
+const schema = z.object({
+  id: z.number(),
+  name: z.string(),
+  createdAt: z.date(),
+  status: z.union([
+    z.literal("pending"),
+    z.literal("completed"),
+    z.literal("cancelled"),
+  ]),
+});
+
+// Ported from [akumatus/FilterBuilder](https://github.com/akumatus/FilterBuilder)
+// Licensed under MIT
+
+const theme = createFilterTheme({
+  primitives: {
+    input: ({ ...props }) => {
+      return (
+        <input
+          {...props}
+          className="w-full px-2 py-1 h-[30px] border border-[#d2d6de] text-[#555] focus:border-[#3c8dbc] outline-none"
+        />
+      );
+    },
+    select: ({ ...props }) => {
+      return (
+        <select
+          {...props}
+          className="w-full p-1 border border-[#d2d6de] text-[#555] focus:border-[#3c8dbc] outline-none"
+        />
+      );
+    },
+  },
+  templates: {
+    FilterGroupContainer: ({ rule, children }) => {
+      const {
+        ruleState: { isRoot, isLastGroup },
+        toggleGroupOp,
+        appendChildGroup,
+        appendChildRule,
+        removeGroup,
+      } = useFilterGroup(rule);
+      const isAnd = rule.op === "and";
+      return (
+        <div
+          className={[
+            "flex flex-col gap-4 w-100 p-2 relative rounded-sm border border-solid border-[#6d77b8] border-t-4 border-t-[#6d77b8] mb-5 shadow-[0_1px_1px_rgba(0,0,0,0.1)] bg-[rgba(255,255,255,0.9)]",
+            "before:content-[''] before:absolute before:left-[-17px] before:w-4 before:h-[calc(50%+18px)] before:border-solid before:border-[#c0c5e2] before:border-b-2 before:border-l-2 before:top-[-18px]",
+            !isLastGroup
+              ? "after:content-[''] after:absolute after:left-[-17px] after:w-4 after:h-[calc(50%+18px)] after:border-solid after:border-[#c0c5e2] after:border-l-2 after:top-[50%]"
+              : "",
+            isRoot ? "before:border-none after:border-none" : "ml-9",
+          ].join(" ")}
+        >
+          <div className="flex justify-between">
+            <div className="flex items-center gap-1">
+              <button
+                className={`flex justify-center items-center px-2 py-0.5 text-xs leading-[1.5] whitespace-nowrap cursor-pointer select-none rounded-[11px] border ${isAnd ? "text-white bg-[#6d77b8]" : "bg-white border-[#6d77b8]"}`}
+                onClick={() => {
+                  toggleGroupOp("and");
+                }}
+              >
+                And
+              </button>
+              <button
+                className={`flex justify-center items-center px-2 py-0.5 text-xs leading-[1.5] whitespace-nowrap cursor-pointer select-none rounded-[11px] border ${!isAnd ? "text-white bg-[#6d77b8]" : "bg-white border-[#6d77b8]"}`}
+                onClick={() => {
+                  toggleGroupOp("or");
+                }}
+              >
+                Or
+              </button>
+            </div>
+
+            <div className="flex items-center gap-1">
+              <button
+                className={
+                  "flex justify-center items-center px-2 py-0.5 text-xs leading-[1.5] whitespace-nowrap cursor-pointer select-none rounded-[3px] text-white bg-[#6d77b8]"
+                }
+                onClick={() => {
+                  appendChildRule();
+                }}
+              >
+                + add
+              </button>
+              <button
+                className={
+                  "flex justify-center items-center px-2 py-0.5 text-xs leading-[1.5] whitespace-nowrap cursor-pointer select-none rounded-[3px] text-white bg-[#6d77b8]"
+                }
+                onClick={() => {
+                  appendChildGroup();
+                }}
+              >
+                + ( group )
+              </button>
+              {isRoot ? null : (
+                <button
+                  className={[
+                    "flex justify-center items-center px-2 py-0.5 text-xs leading-[1.5] whitespace-nowrap cursor-pointer select-none rounded-[3px] bg-[#6d77b8]",
+                    // https://stackoverflow.com/questions/48152562/changing-font-color-of-html-symbol
+                    // https://www.hyperui.dev/blog/text-shadow-with-tailwindcss
+                    "text-transparent [text-shadow:_0_0_0_white]",
+                  ].join(" ")}
+                  onClick={() => {
+                    removeGroup();
+                  }}
+                >
+                  {/* Unicode character for "X" cancel / close https://stackoverflow.com/questions/5353461/unicode-character-for-x-cancel-close */}
+                  &#x2716;
+                </button>
+              )}
+            </div>
+          </div>
+          {children}
+        </div>
+      );
+    },
+    SingleFilter: ({ rule }) => {
+      const {
+        ruleState: { isLastRule },
+        removeRule,
+      } = useFilterRule(rule);
+      const { FieldSelect, FilterSelect, FilterDataInput } =
+        useView("templates");
+      return (
+        <div
+          className={[
+            "flex items-center gap-8 ml-9 relative",
+            "before:content-[''] before:absolute before:-translate-x-full before:w-4 before:h-[calc(50%+17px)] before:border-solid before:border-[#c0c5e2] before:border-b-2 before:border-l-2 before:top-[-17px]",
+            !isLastRule
+              ? "after:content-[''] after:absolute after:-translate-x-full after:w-4 after:h-[calc(50%+17px)] after:border-solid after:border-[#c0c5e2] after:border-l-2 after:top-[50%]"
+              : "",
+          ].join(" ")}
+        >
+          <FieldSelect rule={rule} />
+          <FilterSelect rule={rule} />
+          <FilterDataInput rule={rule} />
+          <button
+            className="flex justify-center items-center aspect-square text-xs font-bold cursor-pointer rounded-full bg-white text-[#6d77b8] border border-[#6d77b8]"
+            onClick={() => {
+              removeRule();
+            }}
+          >
+            {/* Unicode character for "X" cancel / close https://stackoverflow.com/questions/5353461/unicode-character-for-x-cancel-close */}
+            &#x2715;
+          </button>
+          <div className="flex items-center gap-1"></div>
+        </div>
+      );
+    },
+  },
+});
+
+export function AdvancedFilter() {
+  const { context } = useFilterSphere({ schema });
+  return (
+    <FilterSphereProvider context={context} theme={theme}>
+      <FilterBuilder />
+    </FilterSphereProvider>
+  );
+}
diff --git a/packages/docs/src/content/docs/reference/example.md b/packages/docs/src/content/docs/reference/example.md
deleted file mode 100644
index 3d3337b..0000000
--- a/packages/docs/src/content/docs/reference/example.md
+++ /dev/null
@@ -1,6 +0,0 @@
----
-title: 🚧 Example
-description: Practical implementations of Filter Sphere
----
-
-WIP
diff --git a/packages/docs/src/content/docs/reference/example.mdx b/packages/docs/src/content/docs/reference/example.mdx
new file mode 100644
index 0000000..7b660eb
--- /dev/null
+++ b/packages/docs/src/content/docs/reference/example.mdx
@@ -0,0 +1,14 @@
+---
+title: 🚧 Example
+description: Practical implementations of Filter Sphere
+---
+
+## bootstrap styles
+
+This example is ported from [akumatus/FilterBuilder](https://github.com/akumatus/FilterBuilder).
+
+import { AdvancedFilter } from "~/components/examples/akumatus-filter-builder";
+
+<div className="not-content" style={{ marginTop: "1rem" }}>
+  <AdvancedFilter client:load />
+</div>