diff --git a/cli.ts b/cli.ts
new file mode 100644
index 0000000..28f183d
--- /dev/null
+++ b/cli.ts
@@ -0,0 +1,43 @@
+console.log([
+  "===========================================================================",
+  "============================== Seed Splitter ==============================",
+  "===========================================================================",
+  "",
+  "This is a tool which splits 12-word seed phrases.",
+  "",
+  "It does this by fitting a polynomial to K points of your choosing. Once",
+  "this polynomial has been found, you can then calculate any other points you",
+  "like.",
+  "",
+  "Later, you can recalculate the same polynomial using any K of these points,",
+  "not just the ones that originally generated the polynomial. With this same",
+  "polynomial, you can recalculate any of the other points.",
+  "",
+  "    1. Split an existing seed phrase",
+  "    2. Generate and split a seed phrase",
+  "    3. Recover a seed phrase",
+  "    4. Manual mode",
+  "",
+].join("\n"));
+
+let choice: "1" | "2" | "3" | "4";
+
+const exitInputs: (string | null)[] = ["exit", "quit", "stop"];
+
+while (true) {
+  const input = prompt("Choice:");
+
+  if (exitInputs.includes(input)) {
+    Deno.exit(0);
+  }
+
+  if (input !== "1" && input !== "2" && input !== "3" && input !== "4") {
+    console.log("Please choose 1, 2, 3, or 4");
+    continue;
+  } else {
+    choice = input;
+    break;
+  }
+}
+
+console.log({ choice });