
It’s not like we needed it or anything.
Hey everyone, do you remember COCOA?
Of course you don’t. While the most popular answer is probably the beans that make chocolate, in all-caps it’s the COVID-19 Contact Confirming Application, a 41-million-yen (US$390,000) contact tracing app that the Ministry of Health Labor and Welfare released last June.
The way it works is simple: By installing the COCOA app on your smartphone it automatically and anonymously keeps a record of other COCOA users that you come within one meter of for more than 15 minutes. Then, if one of those people tests positive for COVID-19 in the following two weeks, your phone receives a notification that you should get yourself checked out too.
The way it doesn’t work is also simple: For this system to effectively contribute to the reduction of infections, roughly 60 percent of the population would have to have it installed and functioning. This means it would have to be vastly more downloaded than the likes of TikTok, Instagram, and basically any other app in existence, which it made a surprisingly good attempt at.

App Annie Japan crowned COCOA as the most downloaded app of 2020, and according to the ministry it has been downloaded 24.64 million times as of 3 February, 2021. While those numbers would make any app developer drool, it still only amounts to 19.5 percent of the population, in the highly unlikely scenario that each download was made by an individual person and it is still installed on their phone.
I too did my civic duty and downloaded COCOA last summer. There it sat, dormant along with my Stocks and Fitness apps in the “Wasteland” folder.
I never heard so much as a bleep from it since, which I assumed meant I was being super safe during these hazardous times. However, as cases exploded over the winter, some people started noticing that their COCOA apps weren’t pinging even though people they knew were coming down with COVID-19. Others who were infected had trouble registering it in their own app.
As more and more reports of this came into the ministry, an investigation revealed that an update they released last September caused COCOA to not work properly on certain Android devices. Apps on iOS were said to be completely unaffected by the problem, and a fix should be ready by mid-February.
▼ An apology press conference was held by health minister Norihisa Tamura and a densely packed group of reporters.
It is not clear which ones or how many, but Android users account for 31 percent of COCOA downloads. This means as many as 7.7 million COCOA apps might have been rendered useless throughout the entire third wave of infections.
I’m at a loss for words, so let’s see what others had to say:
“…Hey!”
“This…I’m speechless.”
“That’s horrible.”
“Um…Isn’t it too late now?”
“What the hell? I installed COCOA on all my company’s phones, and they’re all Android.”
“Why are they so bad at this?”
“So, it’s okay if Android users get infected?”
“Huh…But if this was such a problem, wouldn’t they have noticed it earlier when the traffic of notifications changed dramatically as a result?”
Indeed, it’s not so much the mistake, since bugs in apps are a part of our daily life, but not noticing something like that for over four months is quite amazing. As the last comment suggested, it means that the problem wasn’t so big, the app isn’t so useful, or both.
Considering about 10,000 of the total 377,000 cases that occurred since COCOA was released were recorded in the app, the answer is pretty clear and we all better start blowing up our inflatable face shields.
Now if you’ll excuse me, I’m going to check if my Stocks app is actually working or not.
Source: NHK, Yomiuri Shimbun, PR Times, Hachima Kiko
Images: ©SoraNews24 (Unless otherwise noted)
● Want to hear about SoraNews24’s latest articles as soon as they’re published? Follow us on Facebook and Twitter!



Only three COVID-19 infected people registered on Japan’s contact tracing app after a month
Don’t uninstall that Covid-tracking app yet, warns Japanese government
Japanese government is shutting down its COVID contract-tracing app
Travelers entering Japan will have to install location confirmation app, Skype on smartphones
COVID-19 appears to be suppressing the flu in Japan, number of cases down and decreasing
Wisteria season starts early with blooming of Japan’s Great Wisteria in its beautiful garden
Japan has new rules for bicycle riders, and these 14 things could get you a fine or a court date
Final version of Sanrio: Beginning of Kawaii exhibition opens in Tokyo[Photos]
First Shiba Inu police dog in Japan’s Gifu Prefecture now on duty[Video]
Japanese trains in Sapporo might be better than those in Tokyo, thanks to one special feature
Japan’s best conveyor belt sushi restaurant of seven years ago has now, finally, come to Tokyo
10 crazy pizzas from Japan
Pringles Chocolate, but with a Japanese twist, is the snack hack you should be trying right now
Hello Kitty joins Mario Maker, may possibly break Japanese-ness level-measuring equipment 【Video】
Lawson convenience store at popular tourist site is one of the most unusual in Japan
Mt. Fuji decorated with a 500,000-flower pink carpet is Japan’s ultimate spring view
30 Pikachus want to share a Tokyo hotel room with you that has separate Grass, Water, Fire spaces
Japanese government wants overseas anime market to roughly triple in 10 years, but are they crazy?
Japan reportedly adding Japanese language skill requirement to most common foreigner work visa
Japanese bento shop sells croquettes for 13 cents, but are they any good?
Starbucks Japan releases FIVE new Frappuccinos in a day, and we try them all in 90 minutes
Pokémon and Ikea Japan cross over into each other’s worlds with collaboration events
Japan now has a special desk for people who work at home with a pet cat[Photos]
Famous Tokyo cherry blossom spot installs view-blocking screens to fight overcrowding[Video]
Uniqlo announces new T-shirts for One Piece, Naruto and more for manga publisher’s 100th birthday
Starbucks Japan releases new My Fruit³ Frappuccino at only 34 stores around the country
Krispy Kreme releases Super Mario doughnuts in Japan for a limited time
Japanese onsen egg maker from 100-yen store Daiso needs to be on your shopping list
Survey asks foreign tourists what bothered them in Japan, more than half gave same answer
Japan’s human washing machines will go on sale to general public, demos to be held in Tokyo
Starbucks Japan releases new drinkware and goods for Valentine’s Day
We deeply regret going into this tunnel on our walk in the mountains of Japan
Starbucks Japan releases new sakura goods and drinkware for cherry blossom season 2026
Studio Ghibli releases Kodama forest spirits from Princess Mononoke to light up your home
Japan’s newest Shinkansen has no seats…or passengers [Video]
Major Japanese hotel chain says reservations via overseas booking sites may not be valid
Put sesame oil in your coffee? Japanese maker says it’s the best way to start your day【Taste test】
No more using real katana for tourism activities, Japan’s National Police Agency says
Young people in Tokyo to be offered points and discounts if they get vaccinated
If you die from the COVID-19 vaccine in Japan, the government will give your family over 44M yen
Up to 300 people a day breaking Japanese quarantine rules, according to reports
Everything you need to know about quarantining in Japan