diff --git a/packages/tui/bench/_harness.ts b/packages/tui/bench/_harness.ts
new file mode 100644
index 000000000..eab5833a7
--- /dev/null
+++ b/packages/tui/bench/_harness.ts
@@ -0,0 +1,19 @@
+/**
+ * Micro-benchmark harness shared by the tui bench scripts.
+ *
+ * `makeBench(iterations)` returns a `bench(name, fn)` that runs `fn` the given
+ * number of times, prints `<name>: <total>ms total (<perOp>ms/op)`, and returns
+ * the total elapsed milliseconds.
+ */
+export function makeBench(iterations: number): (name: string, fn: () => void) => number {
+	return function bench(name: string, fn: () => void): number {
+		const start = Bun.nanoseconds();
+		for (let i = 0; i < iterations; i++) {
+			fn();
+		}
+		const elapsed = (Bun.nanoseconds() - start) / 1e6;
+		const perOp = (elapsed / iterations).toFixed(6);
+		console.log(`${name}: ${elapsed.toFixed(2)}ms total (${perOp}ms/op)`);
+		return elapsed;
+	};
+}
diff --git a/packages/tui/bench/parse-key.ts b/packages/tui/bench/parse-key.ts
index f8500b3f5..5e7659fe6 100644
--- a/packages/tui/bench/parse-key.ts
+++ b/packages/tui/bench/parse-key.ts
@@ -1,6 +1,7 @@
 import { parseKey as nativeParseKey } from "@oh-my-pi/pi-natives";
 import * as native from "../src/keys";
 import * as js from "./_jskey";
+import { makeBench } from "./_harness";
 
 const ITERATIONS = 2000;
 
@@ -56,16 +57,7 @@ const samples = [
 	{ name: "symbol /", data: "/", expected: "/" },
 ];
 
-function bench(name: string, fn: () => void): number {
-	const start = Bun.nanoseconds();
-	for (let i = 0; i < ITERATIONS; i++) {
-		fn();
-	}
-	const elapsed = (Bun.nanoseconds() - start) / 1e6;
-	const perOp = (elapsed / ITERATIONS).toFixed(6);
-	console.log(`${name}: ${elapsed.toFixed(2)}ms total (${perOp}ms/op)`);
-	return elapsed;
-}
+const bench = makeBench(ITERATIONS);
 
 // Set to legacy mode for consistent comparison
 js.setKittyProtocolActive(true);
diff --git a/packages/tui/bench/sanitize.ts b/packages/tui/bench/sanitize.ts
index cad98a321..721d0b052 100644
--- a/packages/tui/bench/sanitize.ts
+++ b/packages/tui/bench/sanitize.ts
@@ -1,4 +1,5 @@
 import { sanitizeText as currentSanitizeText } from "@oh-my-pi/pi-utils/sanitize-text";
+import { makeBench } from "./_harness";
 
 const STRIP_RE = new RegExp(
 	[
@@ -297,16 +298,7 @@ const samples = {
 
 const wrapWidth = 40;
 
-function bench(name: string, fn: () => void): number {
-	const start = Bun.nanoseconds();
-	for (let i = 0; i < ITERATIONS; i++) {
-		fn();
-	}
-	const elapsed = (Bun.nanoseconds() - start) / 1e6;
-	const perOp = (elapsed / ITERATIONS).toFixed(6);
-	console.log(`${name}: ${elapsed.toFixed(2)}ms total (${perOp}ms/op)`);
-	return elapsed;
-}
+const bench = makeBench(ITERATIONS);
 
 console.log(`Text layout benchmark (${ITERATIONS} iterations)\n`);
 
diff --git a/packages/tui/bench/text-layout.ts b/packages/tui/bench/text-layout.ts
index da32f4ffe..650623ff2 100644
--- a/packages/tui/bench/text-layout.ts
+++ b/packages/tui/bench/text-layout.ts
@@ -1,5 +1,6 @@
 import { visibleWidth, wrapTextWithAnsi, truncateToWidth, sliceWithWidth, extractSegments, Ellipsis } from "../src/utils";
 import { matchesKey } from "../src/keys";
+import { makeBench } from "./_harness";
 
 const ITERATIONS = 2000;
 
@@ -13,16 +14,7 @@ const samples = {
 
 const wrapWidth = 40;
 
-function bench(name: string, fn: () => void): number {
-	const start = Bun.nanoseconds();
-	for (let i = 0; i < ITERATIONS; i++) {
-		fn();
-	}
-	const elapsed = (Bun.nanoseconds() - start) / 1e6;
-	const perOp = (elapsed / ITERATIONS).toFixed(6);
-	console.log(`${name}: ${elapsed.toFixed(2)}ms total (${perOp}ms/op)`);
-	return elapsed;
-}
+const bench = makeBench(ITERATIONS);
 
 console.log(`Text layout benchmark (${ITERATIONS} iterations)\n`);