diff --git a/README.md b/README.md
index 73b2389..bfa807c 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,6 @@
 # cteave
 
-Recklessly open all new websites in the browser.
\ No newline at end of file
+Recklessly open all new websites on the internet. That's the idea, anyway. For now, we just open any website that
+obtains an HTTPS certificate, lol.
+
+![screenshot](screenshot.png)
diff --git a/main.py b/main.py
new file mode 100644
index 0000000..03f88f0
--- /dev/null
+++ b/main.py
@@ -0,0 +1,52 @@
+import asyncio
+import webbrowser
+
+import certstream
+import httpx
+from termcolor import colored
+
+client = httpx.AsyncClient()
+semaphore = asyncio.Semaphore(10)
+
+
+async def handler(message: dict, context: dict) -> None:
+    if message["message_type"] != "certificate_update":
+        return
+
+    domains = message["data"]["leaf_cert"]["all_domains"]
+    try:
+        domain = next(d for d in domains if "*" not in d)
+    except StopIteration:
+        return
+
+    url = f"https://{domain}"
+
+    try:
+        async with semaphore:
+            r = await client.head(url, timeout=1)
+    except httpx.HTTPError:
+        print(colored("???", on_color="on_dark_grey"), domain)
+        return
+
+    if r.status_code != 200:
+        print(colored(str(r.status_code), on_color="on_yellow"), domain)
+        return
+
+    print(colored(str(r.status_code), on_color="on_cyan"), domain)
+    webbrowser.open_new_tab(url)
+
+
+async def main() -> None:
+    loop = asyncio.get_running_loop()
+
+    def callback(message: dict, context: dict) -> None:
+        asyncio.run_coroutine_threadsafe(handler(message, context), loop=loop)
+
+    await asyncio.to_thread(
+        certstream.listen_for_events,
+        message_callback=callback,
+        url="wss://certstream.calidog.io/",
+    )
+
+
+asyncio.run(main())
diff --git a/requirements.txt b/requirements.txt
new file mode 100644
index 0000000..e3decf9
--- /dev/null
+++ b/requirements.txt
@@ -0,0 +1,3 @@
+certstream~=1.12
+httpx~=0.23
+colorama~=0.4
diff --git a/screenshot.png b/screenshot.png
new file mode 100644
index 0000000..7122d8b
Binary files /dev/null and b/screenshot.png differ