A bland cleaner app, switched category, 160K installs in three weeks
What it is A one-tap cleaner for Android that also shows battery info and compresses images. It makes money from ads, with no in-app purchases.
Why it took off Starting Oct 21 it bought paid traffic and was placed in the Productivity category, which has far less competition than cleaning apps. At about 20K installs a day it reached the top 50 of the Productivity charts in Nordic countries, Germany, and the Netherlands. Cheap traffic from Iran added installs and ratings on top.
CHow you could follow it Don't copy the cleaning angle. Note the move: putting the same function in a category with less competition, and going for the small-country category charts first. Use that to look for category slots in other tool niches that nobody has claimed yet, then test with a small budget before scaling.
- Data (updated daily) · first launch 2026-09-10 · 11-07 installs 160,503
Android · Total installs worldwide Data 2026-10-29 → 2026-11-07 (10 days, 10 observations). Google's detail page only refreshes install counts every other day, so a flat day doesn't mean nobody installed.Android · Ratings count (cumulative) Data 2026-10-31 → 2026-11-07 (8 days, 8 observations)
Junk Cache Cleaner is a one-tap "cleaner" for Android, and you can find it everywhere. Its features match hundreds of similar apps. It went from 21 installs on Oct 161 to 10K in one day, reached 6K installs by Nov 160, and climbed to #7 on the Productivity free chart in Finland. It didn't build a better product. It changed where it was placed: everyone else was crowded into the Tools category, and it moved to Productivity. Below: what it is, where the installs came from, where the money comes from, and whether you can still use this move.
A negative review that came before the traffic
In 2026 Oct 15, a German user named Heino Glowatzki gave it one star with two sentences: "Dies ist eine App die Probleme schafft, um sie dann Umsatz steigernd zu lösen. Bitte keinen Kontakt mehr." That translates to: this app creates problems so it can then sell solutions for them. Don't contact me again.
At that point it had only one or two hundred installs in total. Six days later, on Oct 21, daily installs jumped from 161 to 10,045 (a third-party estimate; AppBrain also logged it that day in the "10K+" tier). There was no new version, no press coverage, no TikTok videos. Someone must have started paying for installs.
What it is
On open, you get a big "CLEAN" button and a row of entry points: large file cleanup, notification cleanup, app management, speaker cleanup. There is also battery info, image compression, and process management. The store one-liner is "Junk Cleaner & Battery Manager," the category is Productivity, it is labeled as containing ads, and there are no in-app purchases. The privacy policy says it uses Google AdMob and Meta Audience Network.
To be clear: since Android 11, ordinary apps can barely clear other apps' cache, so most of these "cleaning" features are for show. The built-in Files by Google can do the real cleaning, for free and with no ads. Users don't pick this app because it cleans better.
How fast it grew
| Date | Total installs | Score |
|---|---|---|
| Sep 10 | Launched | |
| Oct 9 | Shipped 1.1.0 version, no updates since | |
| Oct 20 | 161 (est.) | |
| Oct 21 | 10,045 (est.) | |
| Oct 31 | 47,563 | 493 |
| Nov 3 | 121,077 | 1,016 |
| Nov 6 | 160,503 | 1,725 |
In the last 7 days it got 127K installs, about 20K a day. Ratings rise by about 230 a day, and the store shows 4.6 stars (Google Play, 11-06).
Everything it has charted on is the Productivity free category. In Nov 6 it held ranks in 14 countries: Sweden 30 (best 25), the Netherlands 41, Germany 41 (best 28), Hong Kong 57, Canada 68, and the US 110. AppBrain logged higher positions around Oct 29: #7 in Finland's Productivity, 41 on the overall app chart; 59 on Iran's overall app chart; 16 in Czech Productivity. It never charted on any country's Top Grossing list.
Where the traffic comes from
First, paid acquisition. The jump around Oct 21 is a classic launch-spike curve. After that, installs ran from a few thousand to over twenty thousand a day, with no content or event in between to explain it. We have not found which channels it bought (Google App Ads, Meta, ad network cross-promotion, or interstitials inside other apps) and have not verified the creatives. User reviews show what people came for: a Dutch user gave four stars and wrote "verwijderd geen virussen" (it didn't remove any viruses); an Iranian user wrote that they installed it and still got hacked and infected. The most common cleaner-ad creatives are scary messages like "your phone is infected" or "storage almost full" (inferred).
Second, cheap traffic from Iran. From Nov 4 to 5, its 150 most recent reviews were all in Persian, with 4 on 113 alone. The English reviews from recent days also come from Iranian users. Many reviews read like rating prompts that popped up right after install: "Just installed it, will rate after using it," "Giving three stars first, will add two more if it's good," "Two stars for now, I'll fill in the rest later" (Persian Google Play reviews, 10-30 to 11-03). Iran is a market with cheap Play traffic and a large user base, but ads there barely monetize. This batch seems to serve to pump installs, ratings, and chart signals (inferred). Some users were just annoyed: "Way too many ads, so annoying... uninstalled." (11-03)
Third, and the most worth learning: category. On Google Play, non-game apps with "clean" or "junk" in the name: 269 of them sit in Tools, pulling 7M installs over 28.4 days combined. Only 70 sit in Productivity, pulling 7M over 2.67 days (based on the Google Play charts across 30 stores, 11-06). The same 20k daily installs that sink in Tools, where rivals do hundreds of thousands a day, can crack the top 50 of the Productivity category chart in small countries like Finland, Sweden, the Netherlands and Germany. Charting there then brings a bit of organic store traffic. Ad rates in those countries are high, which is exactly the audience a pure ad-monetized app wants.
Where the money comes from
Pure ads: app open, interstitial, native, via AdMob plus Meta. Users in Northern and Western Europe bring the revenue, users in Iran bring the numbers. There is no public data on retention or ad revenue.
Apps like this have short lives. The same developer account once published a nearly identical Junk Purify Pro in the Tools category. In July it did about 25k installs, and by the end of October it had dropped to 130k. It's on no chart now, and reviews complain about "other apps popping up all the time." It looks like a test run of the same template. This time they changed the package name and category and scaled it properly. The sensible play is to earn out within the window where acquisition cost is below ad revenue, then move on to the next package.
Who made it
The developer account is Emre Can ŞENYURT, a Turkish individual account created 2020 years ago, with a support email of [email protected] ("oyun" is Turkish for "game"). A person with the same name on LinkedIn works in IT support at a logistics company. The store page's "About the developer" section, however, names a UK company called HIFI LANE LTD, with a UK address and a US phone number. That company was registered in May 2025, and its actual business is selling used Hi-Fi audio equipment. The privacy policy is English written from a Chinese template, and the permissions include a Huawei AppGallery permission. The website is a one-page site built in October, and its image URLs are still blob:http://localhost.
Inference: this is a common pattern in tool-app going-global operations, buying an old developer account and borrowing another company's details. The operator is probably a Chinese team, with one account running one or two apps in bulk (unverified).
Who it's competing with
| Competitors | Scale (11-06) | How it differs |
|---|---|---|
| Files by Google | System-level, preinstalled | Free, no ads, trustworthy |
| AVG Cleaner / CCleaner | AVG 103M installs | Long-established brand, subscription model |
| Cleanup: Phone Storage Cleaner(Codeway) | 36.5M, 7 days +960k | Heavy paid acquisition plus subscriptions, charted in the Tools top grossing list, two orders of magnitude larger |
| Hyper Cleaner / Smart Clean Pro | 980k / 1.15M, +810k / +670k per day, 7 days | Launched between 9 and October, going head-on against it in Tools with paid acquisition, far more aggressive |
| Clean Pro - AI Cleaner | 730k, +650k in 7 days | Launched around the same time, pitched with an "AI" label |
| AI Clean Up(Markcon Apps) | 1.77M, 7 days +270k | Also in Productivity, but with a subscription. Charted on India's Productivity Top Grossing list |
| Deep Clean Elite / Clean Sweep Master | 3.48M / 5.56M | Used this same trick in Productivity early in the year, running more than half a year ahead of it |
In other words, putting a cleaning app in Productivity wasn't invented by this one. At least several others did it earlier and bigger. Since September, several cleaning apps launched and gained more than 7k in 250 days. No media outlet is writing about this category, but plenty of people are doing it.
If it were you
One-line verdict: This app itself isn't worth copying. What's worth noting is the move: same feature, a far less crowded category, and exposure on small-country category charts. In the cleaning category, this move has already been overused.
Who it suits: Teams already going global with tool apps, with paid acquisition budgets, ad monetization experience, and the ability to ship packages in bulk. For them this is a "category × country" product-selection approach.
Who it doesn't suit: Solo indie developers and small teams. There's no product-level opportunity here. The game is acquisition cost, accounts and shipping speed, and there's Google Play policy risk around "fake cleaning" and scare-style ads, where a single email can get you delisted.
How to do it: Don't make a cleaner. Apply the idea to other tool categories. Check how many competitors a feature has in its main category (Tools, Photography, Personalization) and how many installs per day, then check the adjacent categories (Productivity, Lifestyle, Education). If the gap is around tenfold and the adjacent category has no big players, that's an empty slot. Test with a small paid budget first to see which countries' category charts you can enter, then ship a new package to scale.
How to acquire users: Mainly paid acquisition, starting with Northern Europe, the Netherlands, Germany and the Czech Republic, where category chart entry is easier and ad rates are high. Trigger the in-app rating prompt right after users finish using the feature, so ratings clear 4.5 first.
How early you need to be: There's no seasonal window, but category gaps get filled. Cleaning apps were already doing this in Productivity early in the year, and there are now 70 of them. The slot you find will probably stay yours for only a few months (inference).
Signs you've misread it: ① It drops out of the top 100 of Sweden, Germany and the Netherlands' Productivity charts by the end of November, and daily installs fall to a few thousand. That means the approach doesn't pay back and was just a test run. ② Google Play delists it or a batch of similar Productivity cleaning apps, meaning the category arbitrage window has closed. ③ Conversely, it holds steady on the Northern European charts and the developer copies the approach into other categories with new packages, meaning the move still makes money and it's worth hunting for the next empty slot.
Research notes: competitor table, acquisition evidence, full research report
- Competitors
Name Where Launched Scale How it differs from this one Files by Google cleaning features Big-company features 2017 System-level, preinstalled Free, no ads, trustworthy; it isn't stronger on features AVG Cleaner / CCleaner Android 2013 AVG 103M installs, +7k over 94 days Old brand, subscription model; it's a pure ad white-label Cleanup: Phone Storage Cleaner(Codeway) Android 2025-11 36.5M installs, +7k over 960 days, charted in top grossing Heavy paid acquisition plus subscriptions, two orders of magnitude larger in scale Hyper Cleaner / Smart Clean Pro(JTR Labs) Android 2026-09/10 980k / 1.15M, 7 days +810k / +670k Same-period competitor, going head-on in TOOLS with more aggressive paid acquisition Clean Pro - AI Cleaner(BleymarStudio) Android 2026-09-24 730k, +650k in 7 days Same period, with an "AI" label AI Clean Up(Markcon Apps) Android 2026-09 1.77M, +7k over 270 days, India's Productivity top grossing list Also in Productivity, but earning subscription revenue Deep Clean Elite / Clean Sweep Master / Cleanup Master Android 2026-01 / 2026-01 / 2026-08 3.48M / 5.56M / 520k The same "cleaning app in Productivity" move, run before it Junk Purify Pro (same developer) Android 2026-05 130k, no longer on any chart Previous generation on the same template; didn't take off in TOOLS App Cache Cleaner(F-Droid)/ 1Tap Cleaner Open source Years Niche Truly cleans app caches via accessibility permissions, no ads - Where users come from
- Inference Paid acquisition / ad network traffic: between 10-20 and 10-21, daily installs rose from 161 to 10,045 (AppstoreSpy estimate; AppBrain logged it entering the 21 10,000+ tier in October). After that it ran 0.5–28k per day, with no content or media source. Meta, Google and TikTok ad libraries have no record of it (these libraries only track products on their watchlists).
- Confirmed Cheap Iranian traffic: between 11-04 and 11-05, all of the latest 150 reviews were in Persian (11-04 had 113 that day). AppBrain shows it ranking 59 on Iran's overall app chart and 16 in Productivity.
- Confirmed Category arbitrage: Productivity charts in small countries: in our database, non-game clean/junk apps: 269 in Tools, +7M over 28.4 days; 70 in Productivity, +7M over 2.67 days. It ranks #7 in Finland's Productivity, 25 in Sweden and 28 in Germany.
- Inferred in-app rating prompts: 230,5-star reviews add about 81% a day. Iranian reviews are mostly one-word 5-star "عالی" ("great") posts from accounts with real-looking usernames (inferred)
- Inference Content, creators, SEO, media: X corpus, TikTok and web search each return 0 results. The website is a one-page site built only in October.
Why Junk Cache Cleaner (com.junkcache.cleaner) showed up
One-line verdict: It has no product-level differentiation. It's a templated "cleaning + battery + compression + process management" ad-monetized tool. It grew through three things: 10-21 opened the paid acquisition tap (daily installs went from 161 to 10k); it was placed in Productivity, where TOOLS is far less crowded, and pushed into the top of small-country charts in Finland, Sweden, the Netherlands and the Czech Republic; and cheap traffic from Iran, which has recently been stacking up its ratings. Revenue comes from AdMob and Meta Audience Network ads, with no in-app purchases. The category is packed with near-identical products. Our database alone has more than 300 non-game apps with clean/junk in their names.
1. Data
| Date | Total installs | Score | Source |
|---|---|---|---|
| 2026-09-10 | Store launch (the listing date may have been reset by info edits or region expansion) | googleplay.app | |
| 10-09 | Shipped 1.1.0 version (no updates since) | app_snap.updated_at | |
| 10-20 | 161 | app_day_ext (AppstoreSpy estimate) | |
| 10-21 | 10,045 (+9,884 per day) | Same; AppBrain logged "entered the 21 10,000+ tier in October" | |
| 10-27 | 33,736 | Same as above | |
| 10-31 | 47,563 | 493 | googleplay.app_snap |
| 11-02 | 92,497 | 930 | Same as above |
| 11-03 | 121,077 | 1,016 | Same as above |
| 11-06 | 160,503 | 1,725 | Same as above |
- 7 days, installs +126,748, roughly 2–28k per day; ratings about +230 per day. Rating distribution: 5-star 1,394 / 4-star 144 / 3-star 96 / 2-star 144 / 1-star 0 (11-06 details pulled with google-play-scraper).
- Charts (googleplay.chart_rank, 11-06): all in the PRODUCTIVITY free category chart. Sweden 30 (peak 25), Netherlands 41, Germany 41 (peak 28), Hong Kong 57, Canada 68, France 82, US 110. Taiwan reached 11-01 and later dropped to 33 172. It never charted on any store's overall chart or top grossing list.
- Countries outside our database (AppBrain, around 10-29): Finland Productivity #7, overall app chart #41; Iran overall app chart #59, Productivity #16; Czech Republic Productivity #16, overall #98; Denmark overall #168.
- Monetization: the Play page is labeled "Contains ads" with no in-app purchases (app_snap.offers_iap = False). The privacy policy states it uses Google AdMob and Facebook Audience Network (junkcachecleaner.com/privacy.html).
- A sister app under the same developer account, Junk Purify Pro (com.cleanjunk.purifypro, launched 2026-05, in the TOOLS category): about 25k installs in July (AppBrain), 10-29 to 130,686 (our database), and it's on no chart now. User reviews complain of "other apps popping up all the time" and "being constantly pushed to download things" (Play reviews quoted by AppBrain). It can be seen as the previous round of the same template test.
2. Where users came from (growth tactics)
- Paid acquisition / ad network traffic (strong inference, no creatives found in ad libraries)
- Between 10-20 and 10-21, daily installs rose from 161 to about 10k, then ran 0.5–10k per day for the next few days. There was no media coverage, no content, no new version and no platform event. It can only be explained by opening the paid acquisition tap or by redirected traffic.
- Our Meta, Google and TikTok ad libraries have no record of it (these libraries only track products on their watchlists, so no result doesn't mean no spend). The X corpus and TikTok search each return 0 results.
- One 1-star review from Germany (2026-10-15): "Dies ist eine App die Probleme schafft, um sie dann Umsatz steigernd zu lösen" (This app creates problems so it can then profit by solving them). Iranian user reviews repeatedly say things like "deleted all the viruses" and "I got a virus." Users are clearly coming for the promise of "removing viruses and junk," which is the scare-style creative that cleaning apps commonly use (inference).
- Iranian traffic
- Between 11-04 and 11-05, all of the latest 150 reviews we captured were in Persian (11-04 had 113 that day), and the latest 4 English-section reviews also came from users with Iranian names. Our database shows ratings adding +230 per day, which matches the volume of these Persian reviews.
- AppBrain shows it entering Iran's overall app chart at 59. Iran is a cheap, high-volume market on Play, and users there commonly use VPNs, so cleaning and VPN apps do well locally. It's inferred that a fair amount of the cheap Iranian traffic came from paid buys or redirects, possibly including cross-promotion or interstitials in other apps (unverified). The reviews are mostly one- or two-word 5-star "عالی" ("great"), but the usernames look like real people, which points more to an in-app rating prompt than to fake review farming (inference).
- Category arbitrage: list it under PRODUCTIVITY, not TOOLS
- In our library, non-game apps with clean/junk in the name: TOOLS has 269, with +28.4M installs over 7 days; PRODUCTIVITY has only 70, with +2.67M over 7 days.
- At the same 20k installs a day, TOOLS gets buried by products like Hyper Cleaner and Clean Pro, which run at 100k a day. Under Productivity, the same installs can make the top 50 on small-country charts like Northern Europe, the Netherlands, and Germany. Some organic store traffic adds to that. It's how #7 in Finland and #25 in Sweden happened.
- Small-country charts: the Productivity Top Free charts in Nordics, the Netherlands, Czechia, and Hong Kong have low bars, so a few thousand installs can reach the top 50. Ad CPMs in these countries are high too, which suits ad monetization.
- Nothing found: no influencers, SEO, press, Reddit/HN, or X discussion. The site junkcachecleaner.com is a single landing page built by October, and its image URLs still point to blob:localhost, which looks like a direct export from an AI site builder.
3. Competitors
| Competitors | Channel | Launched | Scale | How it differs |
|---|---|---|---|---|
| Files by Google (its cleaning feature) | Big-company features | 2017 | System-level, preinstalled | Free, no ads, trusted; Junk Cache Cleaner has no stronger features |
| CCleaner / AVG Cleaner(com.avg.cleaner) | Android | 2013 | AVG 103M installs, +7k over 94 days | An old brand on a subscription model; it's a pure-ads white label |
| Cleanup: Phone Storage Cleaner(Codeway) | Android | 2025-11 | 36.5M, +960k over 7 days, Top Grossing in TOOLS | Heavy paid acquisition plus subscriptions, two orders of magnitude bigger |
| Hyper Cleaner / Smart Clean Pro(JTR Labs) | Android | 2026-09/10 | 980k / 1.15M, +810k / +670k per day, 7 days | Same-category launch at the same time, head-on in TOOLS with more aggressive paid acquisition |
| Clean Pro - AI Cleaner(BleymarStudio) | Android | 2026-09-24 | 730k, +650k in 7 days | Same period, with an "AI" label |
| AI Clean Up(Markcon Apps) | Android,PRODUCTIVITY | 2026-09 | 1.77M, +7k over 270 days, India's Productivity top grossing list | Also in Productivity, but earning subscription revenue |
| Deep Clean Elite / Clean Sweep Master / Cleanup Master | Android,PRODUCTIVITY | 2026-01 / 2026-01 / 2026-08 | 3.48M / 5.56M / 520k | The same category-arbitrage play, run by someone who went first |
| Junk Purify Pro (same developer) | Android,TOOLS | 2026-05 | 130k, no longer on the charts | The previous generation of the same template; in TOOLS it never took off |
| 1Tap Cleaner, App Cache Cleaner (open source on F-Droid) | Android / open source | Years | Niche | Actually clears other apps' caches (via accessibility), no ads |
Data from googleplay.app_profile, 2026-11-06.
4. Differentiation
No product differentiation. The home screen has a big CLEAN button, with large-file cleaning, notification cleaning, app management, speaker cleaning, battery, compression, and process management below it, looking like hundreds of identical competitors. Since Android 11, ordinary apps mostly can't clear other apps' caches, so most of these features are demo-only.
The only real difference is distribution: it picked the Productivity category and rides the cheap traffic of small-country charts and Iran. That's why it charts more easily than TOOLS peers, but it's not why users choose it.
5. Who is behind it
- The developer account name is Emre Can ŞENYURT: a Turkish individual, listed on LinkedIn as IT support at Mars Logistics. AppBrain shows the account has existed for 2020 years, and the support email is [email protected] ("oyun" is Turkish for "game").
- The Play page's "About the developer" lists HIFI LANE LTD, with a Thatcham, UK address, but also a US phone number, +1 913. Companies House shows the company was registered 2025-05, with a sole director, the British/Polish Magdalena Maria Kowalska, under a retail industry code. In practice it runs a used Hi-Fi audio webshop, hifilane.co.uk.
- The privacy policy is English written from a Chinese-template ("SDK/API/JS code version", "the release status of the application in the app store"). The permissions AppBrain captured include
com.huawei.appmarket.service.commondata.permission. - Inference: this is the common "buy an aged developer account + borrow a registered entity's details" practice. The operator is likely a Chinese tools-focused overseas team mass-producing apps at roughly one or two per account (unverified).
6. Where the money comes from
Pure ads: interstitial, app-open, and native, served by AdMob and Meta Audience Network. Small countries (Nordics, Germany, Netherlands) have high eCPMs; Iranian volume barely monetizes and mainly serves to pile up installs, ratings, and chart signals (inference).
Each app's lifecycle is short: a sister app dropped off every chart after 4 months. The sensible play is to ride the window where paid-acquisition cost is below ad LTV, then swap in a new package.
7. How many people have seen it
No press, X, TikTok, or Reddit discussion, and no public revenue, so it counts as "little known." But the play itself is a public industry pattern, and the category is extremely crowded: our library alone has several cleaning apps launched after September that grew more than 250k in 7 days.
8. Takeaways
- The same function can be listed in a less competitive category (Tools → Productivity). Small-country category charts have low bars and high eCPMs, and charting brings some organic traffic.
- Test with one package at small scale first (Junk Purify Pro), then scale up with a new package in a new category.
- Use in-app rating prompts alongside large batches of new users, and ratings will climb above 4.5 quickly.
9. Uncertain
- I couldn't find creatives for the specific paid channels (Google UAC, Meta, Mintegral/Unity cross-promotion, or interstitials inside VPN apps). Unverified.
- Whether the Iranian volume was bought, cross-promoted, or organic store traffic is unverified.
- Retention and ad revenue are completely unknown. There are no in-app purchases and no Top Grossing signal.
- Who the team is and whether there are other sock-puppet accounts is unverified.
- Google Play's enforcement on "fake cleaning" and scare-style ads could get it removed.
Sources
- googleplay library (agent-im server): app_profile, app_snap, chart_rank, app_day_ext (AppstoreSpy estimates), 2026-10-29 to 11-06.
- Google Play listing play.google.com/store/apps/details?id=com.junkcache.cleaner, with reviews and rating distribution pulled via google-play-scraper (2026-11-06).
- AppBrain www.appbrain.com/app/junk-cache-cleaner/com.junkcache.cleane… (read via Exa, data dated 2026-10-29); www.appbrain.com/app/junk-purify-pro/com.cleanjunk.purifypro
- Website junkcachecleaner.com/, privacy policy junkcachecleaner.com/privacy.html
- Companies House HIFI LANE LTD(16470067)find-and-update.company-information.service.gov.uk/company/1…
- Searched package names in the metaads, googleads, and tiktokads libraries, 0 results; x-radar search for "junk cache cleaner", 0 results; TikHub search, 0 results.