A "family locator" app that had never been updated got 770k installs in five days and charted #1 in the Japan Utilities chart

A small company in North Bengkulu, Indonesia built an Android location app for "find your kids and family." It has never been updated since its July launch. From Oct 21 to 25, it got about 770k installs in five days, roughly three-quarters of its 1.02M total installs to date. On Oct 31 it hit #1 in the Google Play Japan free Tools chart and #10 overall. Almost no one who installed it uses the location feature; the reviews mostly complain about ads. This piece covers what it actually ran on, where the money came from, and whether there's still room for you on this path.

"Never got to finish a video"

On Oct 13, a Japanese user named Masako Uehara left a review on its store page: "続きをみたくても途中から違うコマーシャルで、今まで最後迄見たことが無い" (I try to keep watching, but a different commercial cuts in partway, and I've never once watched to the end). By Nov 6, this review had 412 "helpful" votes, the top review in the Japan store.

Scrolling further, another Japanese user wrote "Googleマップは常に最新で使いやすい" (Google Maps is always up to date and easy to use), with 141 helpful votes; someone else gave 3 stars because "待ち時間にちょうどよい" (it's just right for killing time while waiting). The top review in the French store, with Oct 1,60 helpful votes, reads: "Fast, but you have to watch 30 ads to use it, and the visuals are bad. Just use your car's navigation."

Put together, these show what the app really is: the store page says child location tracking, but users get a map stuffed with ads, and many use it as a navigation app or a stand-in for Google Maps.

What it is

Its name is Phone Tracker Pro & Locator, the developer is Noesantara Tech, registered in Bengkulu, Riau, Indonesia. Launched in July 2026 22, the version number is still 1.0.0.0 today. Free, labeled "contains ads," no in-app purchases.

The store description is standard family-locator copy: real-time location of kids, family location sharing, location history, geofences, and repeated insistence on "consent required, no covert tracking." But the one-line summary on the page says "Easily track your current location," which doesn't match child tracking; it reads more like an on-device map. Whether it actually does two-sided location sharing can't be seen from outside (unverified by installing).

It uses a different name in each market: the Japan listing uses the original English name; Taiwan and Hong Kong call it 「手機追蹤器專業版」; Thailand uses the Thai 「手机追踪器 Pro」; and the French store just calls it "Localisateur Pro Mobile" (mobile locator Pro), all terms locals type when searching for "phone location."

How it took off: a budget switched on, then off

Before Oct 29 the figures are third-party estimates; after that they are Google Play install counts, 11-06.

This curve doesn't look like word of mouth. Word of mouth climbs slowly; this is a wall built on flat ground, followed five days later by a cliff: the classic "turn ads on, turn ads off." Two side signals back this up:

• On the same day, another app from the same developer also jumped. Its Loan Calculator Max, which normally gets a few hundred to a few thousand installs a day, rose about 22k on Oct 21, the same day. Two apps with nothing in common scaling on the same day most likely means the developer switched on paid acquisition at the account level (inference).
• Almost nobody rates it. 1.02M installs have only 1,065 ratings, roughly one in a thousand. From 10-29 to 11-06 installs rose 84k, but ratings only gained 99. Users who come looking for an app usually rate it at a rate of a few tenths of a percent to one percent; this ratio looks more like people who clicked an ad inside another app, installed, and left.

Searching its name on TikTok turns up no related videos, nobody mentions it on X, and there's no press coverage. Its only source of users is bought traffic. Whether it was bought through Google or an ad network, and how much was spent, can't be found from outside (inference: most likely Google app-promotion ads or ad-network traffic swaps).

After charting there was a short stretch of "free" store traffic: from 10-30 to 11-01, while it ranked #1 in Japan Tools and near the top 15 overall, it still got about 10k installs a day; when the rank dropped, installs dropped too. Over 11 days, its Japan Tools rank slid from #1 to #28, and its overall rank from #10 to #119.

Why Japan

Most people running this kind of location shell focus on cheap-traffic markets like Nigeria, India, and Indonesia. This one goes after Japan instead, for two reasons:

• Ads are expensive. In Japan, advertisers pay far more per interstitial impression than in lower-income countries, so one bought user can earn several times more before churning (inference; exact CPMs aren't visible from outside).
• Chart barriers are low. In the Japan Play Tools chart, just ten to twenty thousand installs a day can get you to #1 and into the top 10 overall. In the Japan free Tools chart on Oct 31, at least half of the top 30 were PDF readers, phone cleaners, and QR scanners from shells published 2025 to 2026 years earlier (Google Play Japan chart, 10-31). That chart is itself a hot spot for buying traffic to sell high-priced ads.

The "child / family location" pitch is also well chosen: where your kids are, where your parents are, is the kind of anxiety that makes parents and middle-aged users tap an ad. Looking at the names on Japan reviews, many are full names common among middle-aged and older Japanese, like Masako Uehara, Noriko Kitayama, and Masato Ohashi.

Where the money comes from

Ads only. No in-app purchases, so it never shows up on the grossing charts, and its revenue isn't public. The business math is simple subtraction: one bought user gets hit with interstitials and rewarded videos a few times before they uninstall (reviews say "30 ads"). As long as the ad money you earn back exceeds what you paid for that user, you make money. High-CPM markets like Japan, French-speaking regions and Taiwan/HK make that subtraction easiest.

Whether it's actually profitable can't be seen from outside. The date paid acquisition stopped (10-25) could mean a run that paid back and got shut down, or that the numbers stopped working. We can't tell which.

Who it's competing with

The established family-location apps are hundreds of times bigger, but they aren't the same business:

The real competitors are new shells running the same playbook, released this year and all trying to chart in Japan's utility or maps rankings:

Google Play, 11-06.

Over twenty Android apps released since 2026 April, with tracker / locator / GPS in the titles, and each one passed a million installs. This one is mid-sized in that group. It reached #1 by picking Japan and spending heavily over a short period.

If it were you

Verdict: Copying it to build a location shell is really an ad arbitrage play, not a product. The playbook works, but this category already has twenty-plus copycats this year, and half of Japan's utility chart is tool shells. What you bring is media-buying skill; there's nothing in the product you can defend.

Who it's for: Small teams already running utility ad shells, comfortable buying installs on Google, integrating AdMob and other ad networks, and able to work out per country how much ad revenue a user is worth versus what one costs to acquire. For you, this is a homework assignment: switch category, switch country.

Who it's not for: Indie devs who want to win on product and grow through word of mouth. There's no retention here. The moment spending stops, installs drop, and reviewers don't care about location tracking itself. Anyone without a media budget or experience can't get past the first step.

How to do it:

1. Picking the country matters more than picking the category. Work out the ad revenue in high-CPM markets like Japan, French-speaking regions and Taiwan/HK first, then decide where the budget goes. Don't default to the big, cheap-traffic countries.
2. Name it separately in each language. France uses Localisateur, Taiwan/HK uses 手機追蹤器, written from the words locals actually search. Don't translate the English name literally.
3. Spend short and heavy, ride the top spot for a few days to pick up store traffic, then pull back. Its own data shows that around 10–20K installs a day was enough to reach #1 in Japan's utility chart.
4. Run two or three shells in different categories from one account, and start spend on the same day, to spread the risk of any single category getting crowded out or pulled.
5. If you want to last longer than it did: Go easy on the ads. Its 1-star reviews make up 30%, and the most useful ones all complain about ads. Ad experience that's too heavy, and features that don't match the description, are the most common reasons Google Play pulls apps like this. Actually building dual-platform location sharing would keep at least some parents around.

How to get users: Only two channels, paid acquisition and store chart placement. Social media and content don't work in this category. It has no discussion at all on TikTok or X.

When to move: No deadline and no window. This is a grind that's been running for a while. The real clock is Google Play's policy: the day it starts a bulk cleanup of Japan's utility shells, this path gets narrower.

Signs you're reading it wrong: If it jumps back into the Japan utilities chart at #5 with tens of thousands of installs a day before December, the first round has paid off and developers are doubling down, so this arbitrage is better than it looks. Conversely, if it and the similar apps in the table vanish from the store one by one over the next month or two, the platform is clearing them out, and anyone following in is paying tuition for the takedown.