Chirp Pong

What it is

Chirp Pong is a two-player browser game experiment Simon Willison released on October 15. It plays like classic Pong: each player holds a phone and the two of you face off up close. The page puts it simply: "No Wi-Fi, Bluetooth or accounts." The two phones talk to each other by chirping, through the speaker and microphone. On his blog, Willison says he asked Claude Opus 5.5 Extra in Claude Code for a two-player game whose state is sent as sound, with graphical and gameplay twists to make it more fun, and his verdict was "It seems to work!" The source also has a mode against a computer opponent, which doesn't use the microphone. The neat part is that the two phones need no network at all: they stay in sync by sound alone, and the whole game is a single static web page.

Who it's for: anyone with two phones and a friend nearby who wants a fresh little game, and anyone curious whether sound can stand in for a data cable.

Before you start: open it in a phone browser with no install or sign-in; it lives on the author's own site. Two-player mode needs permission to use the microphone, with the speaker on; you can also turn on vibration and keep the screen awake. We read the source at a fixed version: the sound only travels between the two phones, we found no code that saves or uploads recordings, and scores aren't sent anywhere. The page loads Google Fonts from the web, so it isn't fully offline. The author calls it a game experiment; how it copes with a noisy room, and which phones and browsers work, isn't stated, and we haven't tested it. The interface is in English, with no age rating given. It's free, and the source is in the simonw/tools repository under the Apache-2.0 license.

Based on the game page, its source code and the author's blog. Not tested by AI Inspiration World.