Chicago, IL — Every five seconds, a red pulse cuts through the dark off the Chicago breakwater. The Chicago Harbor Light has been sending the same message since 1893, and almost everyone on shore thinks it’s just blinking.
It isn’t blinking at random. It’s stating its name.
In their own ways, so are the airport beacon on the horizon, the buoy spelling out the letter A across the bay, and, far less romantically, the router LED flashing three-then-two at you from behind the TV. The built world has always been talking in light. We just stopped knowing how to listen.
Enter Flashback, an iPhone app from Chicago creative studio HoneyWired® that listens to all of it, and talks back in the slowest, most tactile way possible.
Two People, Line of Sight, No Server
Flashback turns an iPhone into a two-way optical telegraph.
- To send: Type a message and it pulses out of the flashlight as Morse code, with a click in your ear and a tap in your palm for every dit and dah. The Morse appears under each word as you type, along with an honest estimate of how long it will take. Rather work it by hand? A built-in straight key turns your thumb into the operator.
- To receive: The phone watches through its camera for the reply, which arrives as letters. There’s no speed to set and nothing to calibrate; Flashback works out the rhythm on its own.
- To disappear: About ten seconds after a message is read, it fades and is gone. No cloud backups, no message threads, no read receipts. Nothing is written down, which is the whole idea, and also the name.
Six Interpreters. Zero Guesswork.
Point the camera at anything that blinks and press Watch. Flashback doesn’t just read a friend across a rooftop; it reads the lights of the world around you. Six interpreters listen to the same stream of light and dark at once, and the most confident one wins:
- Morse: from a phone, or from a cold hand on a Maglite. No words-per-minute is set anywhere; it measures the rhythm of whatever it’s watching and keeps re-measuring.
- Lighthouses: measures the period and pattern and writes it in the notation used on nautical charts, like Fl R 5s.
- Lights that spell: a safe-water buoy flashes Morse A, over and over, forever. Flashback reads it as the letter it is and tells you what it means.
- Airport beacons: white and green is a civil field, white-white-green is military, and white and yellow is a water aerodrome.
- Blink codes: three flashes, a pause, two flashes. Counted, and named when the device is one it knows.
- Tap code: the five-by-five prisoners’ grid, row then column, sent by flashlight through a window.
A bike strobe is labeled a regular flasher rather than translated into gibberish. And when Flashback isn’t sure what a light is saying, it says so. It never invents letters to look smart.
432 Lights, and an Honest Answer About Which One
Flashback carries an offline list of 432 lighthouses and navigational lights. A rhythm on its own is rarely unique: Fl R 5s belongs to the Chicago Harbor Light, to Eagle Harbor Light on Lake Superior six hundred kilometers away, and to five other aids besides.
So instead of picking one and sounding confident, Flashback shows you the characteristic and the size of the field. Turn on location, which is off by default, and the phone’s own GPS and compass narrow it to the light in front of you, with no network connection involved.
Learn It by Ear, Not by Chart
For anyone who wants the skill in their own hands, there’s a trainer that teaches the way operators were actually taught: at full speed, from the first minute.
- The Koch method: two characters at fifteen to twenty words a minute, with a third added once you get ninety percent of a run right. Koch showed in 1936 that learning slowly builds a counting habit that later has to be unlearned.
- Farnsworth spacing: the characters never slow down. The silence between them stretches instead, and shrinks as it gets easy.
- No multiple choice: you hear it, then key it back on the straight key, and the same decoder that reads a lighthouse reads what you sent.
- All 39 characters, then real copy: the letters, digits and punctuation, then five-character groups, 348 real words and operators’ shorthand, and short runs of real traffic.
A Toy with a Manifesto
“Nearly every light you walk past at night is saying something, and almost nobody can hear it,” says Kevin McGlone, Creative Director at HoneyWired. “A harbor light is telling you its name. A buoy is marking safe water. We wanted to build something that listens, and answers back across a dark room. It’s a toy with a manifesto: no signal, no wifi, no record. Just light.”
The Privacy Is in the Architecture, Not the Settings
- No network requests, ever: iOS gives every app network access and no way to hand it back, so the promise is about what Flashback does. It contains no networking code and no third-party SDKs, which means airplane mode changes nothing.
- Nothing kept: no accounts, no servers, no message history. The only things saved on the phone are your settings and your progress in the trainer.
- Location stays local: off until you turn it on, and even then it only sorts a list that’s already on the device.
Honest About Its Limits
Light isn’t fiber optics. “Hello world” takes about fifteen seconds at the medium setting, and a phone flashlight can’t switch much faster than ten times a second, which caps sending at roughly twelve words a minute. Range is as far as you can see the light, and daylight is the hard case.
Flashback shows a photosensitivity warning before the first flash, never pulses faster than ten times a second, and can send with the screen instead of the flashlight. And it is not a safety or emergency device — the app says so before it flashes anything.
Pricing and Availability
Flashback is available now on the App Store for $4.99, once. No subscription, no in-app purchases, no account. Requires an iPhone running iOS 17 or later.
Download Flashback on the App Store →
See it blink at honeywired.com/apps/flashback.