A Hanoi construction consulting firm sold 100k "emoji batteries" in two weeks: this isn't a product, it's an ad-buying machine

On Android, a small category has already been run into the ground: swapping the battery icon in the status bar for emojis, kittens and stickers. In October 21, a developer account tied to a Vietnamese construction consulting firm dropped another new package into it. It hit 100k installs in two weeks and charted in the personalized free charts of 13 countries. Below: how it took off, where the money comes from, what's left in this category, and whether you should get in.

A "maybe it's fake" review

In Nov 5, a Google Play user named yuji farajh left a note on Customize Emoji Battery Icon:

I don't know if it's fake but it's good. ("I don't know if it's fake, but it's good.")

That line is pretty much the whole app. The store page says it plainly: change the battery icon, change the status bar, add an emoji battery widget; "pick an emoji you like → preview → apply." To draw stickers on the status bar, it asks you to turn on the accessibility permission, and the store page even includes a YouTube Shorts video showing how. No in-app purchases, only ads.

The developer is listed as "368 Phuc Minh Investment." The website it links, 368phucminh.online, opens to the homepage of a Hanoi construction investment consulting firm, and the company shows up in Vietnam's business registry (tax ID 0110704626). The same account has 11 other apps: document scanner, image-to-PDF, translation, 3D earth, pet translator, piano, guitar, voice lock screen, land measurement... all common paid-acquisition categories. They started launching 2026 years ago, and together they total about 1M installs (AppBrain). Opening accounts under an unrelated company and mass-producing template apps is a common practice among Vietnamese app studios.

How it grew: two switches

Cumulative installs since launch (before 10-28 is third-party estimates, after that is Google Play daily observation):

Two step changes, with the period in between and after nearly flat. Organic search traffic doesn't switch on and off like that. The shape points to budgeted ad buys in batches (inferred). I found no direct ads for it in the Google, Meta, or TikTok Europe ad libraries, and some installs may have come from cross-promotion with other apps on the same account.

The charts followed: around 10-29 it peaked at Sweden personalized free #30, Vietnam #36, and US #73. Once spending stopped, around 11-05 it fell to Vietnam 129 and US 171. 11-06 Vietnam jumped back to 47, with 97 new ratings that day. A third round may have started. Wait a few more days to confirm.

How the 4.4 rating came about

In October 29 it had 31k installs and 1,373 ratings, a rating rate of about 4.4%, absurdly high for a utility app. The distribution is stranger still: 5 stars 1,029, 4 stars 193, 3 stars 107, 2 stars 42, and 1 stars 0. Among more than a thousand ratings, not one is 1 stars. There's basically only one explanation: the app first shows a "Do you like it?" prompt and sends only the people who tap "Like" to the store to rate (inferred; the exact method is unverified). After that, real users come in and the 1-star count climbs from 0 to 11-06 with 98 ratings.

What real users complain about is clear from sister apps in the same category. Vietnamese studio STARVIA's similar app got one-star reviews in the US store in October, and almost every one says the same thing:

"You have to watch a million ads just to install this junk, and they take up half the screen." (US store, 10-11,31 people found it helpful) "The moment I opened it I was hit by 17 ads, so I uninstalled right away without even seeing what the app looks like." (US store, 10-17) "First time I opened it, it made me install another fake PDF app." (US store, 10-12)

Taiwanese users' complaint about another top package was that its flag option was a five-star flag. The product quality of this kind of app is roughly like that.

Where the money comes from: thin, so it depends on volume

There are no in-app purchases, so revenue comes entirely from ads: app-open, interstitial, and a prompt on each preview and theme application. The problem is that users stop opening the app once they've changed their battery icon, so only the first few sessions show ads. The business math therefore has only one logic: in cheap-acquisition countries like Vietnam, Thailand, the Philippines and Malaysia, buy installs below what ad revenue can recover and make it up on volume. If it doesn't pay, stop spending and switch to the next package (estimated; no public data on its ad revenue).

The first observed version numbers went from 10.0,11-03 to 11.0, and 11-04 to 12.0. The code was copied from elsewhere, not written from 1.0. When costs are this low, a failed run isn't painful.

Who's competing: this category was already crowded

It isn't the first, and it isn't the biggest. Searching Google Play for apps with battery + emoji in the name (11-06):

These are only some. There are 20+ similar packages, and their package names follow nearly the same template: com.cute.emoji.battery.icon.widget.customize.emojisticker.statusbar, ai.starvia.emoji.battery.icon.statusbar.sticker.customize... They very likely come from the same source code (inferred). This app added +69k in 7 days, only a sixth of the leader.

Competitors are openly buying ads. In the Google ad library, HYPERNOVA LIMITED has been running install ads for Ahc Foundation's emoji battery package since 10-13. In the TikTok Europe ad library, LUTECH has been advertising Battery Emoji Buddies for STARVIA since 11-02.

The demand is real, and it's old. The "iPhone emoji battery" meme was already big on TikTok in 2023: an iphonnation tutorial on adding emojis to an iPhone battery got 2025-02-17 12.4M views, and a selene0947 video from 2023 got 7.76M. The Android seller account gpsarea68 posted an "Emoji battery app" video with 8.69M views. The top two apps are each still gaining roughly 400k a week, so this traffic is far from exhausted. It's just already been split up.

Where it falls short

There are two openings, but people are already working on both:

• Emoji battery + screen pet: ZAppsolution, Tools for Everyday and SHINK have already merged the emoji battery with Shimeji desktop pets that walk around the screen. Growth is better than pure battery packages.
• iOS: Apple doesn't let apps modify the status bar, so you can only build widgets, charging animations, Dynamic Island-style features. The App Store already has Emoji Battery Charging, promoted by HYPERNOVA.

What's left, "fewer ads and fewer permissions," is what users actually want. But in a business that runs on ad revenue, fewer ads means less income.

If it were you

C: worth learning from, but following it isn't worth it. It proves how efficient a Vietnamese studio's buying machine is. It doesn't show there's still room here.

Who it suits: studios that already have an ad-buying team, a template-app pipeline, access to cheap installs in Southeast Asia, and ad revenue to cover costs. For them it's one more template category to add to the portfolio, though they'll be competing with 20+ similar packages for the same keywords and the same cheap traffic.

Who it doesn't suit: indie devs and small teams. Without existing buying capacity or ad monetization tuning, your package is number 21 here. Relying on organic store search, anyone who searches "emoji battery" sees the two 15M-install apps first.

If you must build: don't make a pure battery package. Move toward pets or characters (the Shimeji combo already works, but character IP and holiday themes still have room to segment), or build a compliant iOS version (Dynamic Island, Live Activity, charging animation). Cap ad frequency at a level users will keep using, and target the group in the bad reviews who think it's cute but has too many ads.

How to acquire users: this category has two traffic sources, store keywords (cramming emoji / battery / statusbar / sticker / cute into the package name and title) and paid buying. Demand on TikTok is constant, but most of the videos that drive volume are ads from merchant accounts. Test in cheap countries like Vietnam or the Philippines with a small budget first, work out the cost per install and how many ads each user will see, and don't add money if it can't pay back.

When to get in: there's no clear window. The category has been hot since spring and is still growing weekly, but new packages enter every week too. If you try, the year-end holiday themes (Christmas, New Year) are the nearest creative moment.

Signs you've misjudged it: ① the top two's weekly new installs fall from 400k to below 100k. Demand is declining, so don't enter. ② This app keeps gaining several thousand a day steadily without a new step change. That would mean organic volume is bigger than we thought, and even a pure reskin can capture search traffic. ③ A similar package with fewer ads, plus a subscription or one-time purchase, reaches the top without obvious spending. That would mean people will pay for a better version, and that's the opportunity for indie devs.