LeaveHomeSafe

» see leavehomesafe.gov.hk as it lived, on the wayback machine

~ the obituary ~

The Hong Kong government released LeaveHomeSafe on 16 November 2020. It did one thing at the start. You opened the app at a venue door, pointed the camera at a printed QR code taped to the glass, and the visit went into a log held on your own handset. If a confirmed case was later traced to that venue, the health department could push a notice to everyone whose log matched it. Downloads passed 2.69 million by 22 February 2021, a figure the government quoted often while critics questioned it just as often.

Voluntary did not last. Through 2021 the scanning requirement spread outward from government buildings until it covered restaurants and then almost every indoor place a person would enter on an ordinary day. The printed code by the door became part of the furniture of the city, in the way that a fire exit sign is part of the furniture.

On 27 January 2022 the app took on the Vaccine Pass. That is the moment it changed category. A visit log is a record of where you have been. A pass is permission to go in, and the same piece of software now held both. It also carried the Red and Amber codes that could keep a person out of a building entirely.

The unwinding was fast once it started. Venue scanning stopped being required on 13 December 2022 and the Vaccine Pass requirement went on 28 December. On 8 January 2023 the government announced that the system had ceased operation and would not be updated again.

~ the case file ~

~ how it got compulsory ~

Most contact-tracing apps of that era were opt-in and stayed opt-in, which is why most of them were ignored. Hong Kong went the other way. The app was attached to entry itself, so refusing to install it meant not eating indoors, and by early 2022 it meant a great deal more than that.

Once the Vaccine Pass was inside it, the app was doing enforcement rather than epidemiology. Staff at a door were not reading anyone's exposure history. They were looking at a color on a screen and deciding whether to let someone past.

~ the trust argument ~

The government's answer to the privacy question was technical and mostly accurate: the visit records sat on the user's own phone rather than on a central server, and they aged out on their own. Bloomberg still headlined the shutdown as the end of an app that had raised privacy concerns, which tells you how little the technical answer settled. The argument was never really about where the rows were stored. It was about a government deciding which doors you could walk through and shipping that decision as a download.

There was also a counterfeit problem serious enough that Hong Kong police publicly said they would hunt down the makers of fake versions. Any software that becomes the price of entry to a room grows a market in copies that lie on your behalf, and this one grew that market inside a year.

~ the same rule, somewhere else ~

Turkey ran its own version of this in the same years. HES kodu (short for Hayat Eve Sığar) was a code you generated and handed over for intercity buses or flights. For a while it covered a lot of other doors too. Nobody framed it as an app you loved. It was a string you produced when asked, and then one day nobody asked anymore and most people never formally deleted anything.

That shared shape is the interesting part of LeaveHomeSafe. Half the world built one of these between 2020 and 2021, every country insisted its own version was the careful one, and almost all of them ended the way this one did, with a government notice rather than a farewell screen.

~ the day the scanning stopped ~

There was no wind-down period and no export. The January 2023 notice said the system had ceased operation and would not be updated again. The download listings went, and that was the whole ceremony for a piece of software an entire city had been required to carry.

What is left is the physical layer. Hong Kong spent two years putting laminated QR codes on doorframes, and those outlasted the service they pointed at, the way a payphone outlives the network behind it.

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