The Android version fifteen years in the making: Korean budgeting veteran Weple switches platforms and hits Top Grossing in three weeks

This is not a new app that broke out. "위플 가계부" (Weple Money) has been on the Korean iPhone App Store for fifteen years, with 217k ratings. In 2026 October it released its first Android version, and within three weeks it reached 4,800 installs and ranked #16 on the Korean Google Play Finance Top Grossing chart. Below: where users come from, where the money comes from, who the competitors are, and what you can take away. If you want to copy it, the opportunity isn't in it.

A user who switched to Galaxy

In 2025 August, a Korean user posted on X: "위플가계부 안드로이드는 안나오나ㅠㅠ 아이폰쓸때 너무 잘썼는데 폰 바꾸고나서 이거만큼 편한 어플 못찾음" (Is there no Android version of Weple? I used it so well on iPhone, but since switching phones I haven't found an app as easy as this one).

Comments like this have circulated in Korea for years. On ruliweb someone asked whether there was a budgeting app on Android like Weple. A Naver blogger wrote a review in 2025 September that began "I've been a Weple user for 8 years... but it's iPhone-only, so I can't recommend it to Android users (I've been hoping for an Android version and never got one ㅠㅠ)", and then went off to try other apps.

On 2026 Oct 24 the iPhone version updated to 6.1.7, and the third item in the release notes read: "이제 가계부를 안드로이드(갤럭시)로 옮길 수 있어요" (You can now move your budget book to Android, Galaxy). The Android version went live on Google Play on Oct 17.

What it is

A hand-logged budget book whose main screen is a monthly calendar. Each day shows what you spent and earned in its cell, with this month's income, expenses and balance at the top. Logging an entry takes seconds: enter the amount, pick a category, save. No sign-up is needed, data is stored only on the phone, and bank accounts aren't linked.

The calendar, logging, budgets and statistics are free, with banner ads. Pro unlocks multiple ledgers, foreign currency, weekly budgets, asset tracking, annual reports and ad removal. The official site lists lifetime, yearly and monthly tiers, and Google Play IAP is priced at $0.39–$22.99.

The Android version also took the chance to add features the iPhone version never had: type a line of text to auto-categorize it, screenshot a receipt to recognize several entries at once, and read payment notifications to record automatically (without SMS permission). This targets "automatic bookkeeping", which Korean Android users are already used to.

Numbers: growth in waves

Installs rose 3,260 times in one week. Third-party estimates put daily new installs at 100–400 on most days, with several spikes around 10-25, 10-30 and 11-03 jumping to five or six hundred to over nine hundred a day. That is not the steady curve of sustained paid acquisition. On the Korean Play Finance free chart it climbed from #10-29 195 to #11-04 77; on Top Grossing it sat at #11-05 and #11-06 at #16.

#16 sounds good, but the bar for this chart is low: on the same day, #11 Early Green Budget (초록가계부) had only 57k total installs, and #15 was a paid ad-free version of a budgeting app with 170k installs. Only a few thousand installs are enough to reach the top 20, so the rank shows some people are paying, but not how much (inference). The app also appears on the Finance Top Grossing charts of 18 other countries (ranks 149–171, moving together each day); that is a projection of the same aggregate chart into each country and doesn't mean those countries have real revenue.

One oddity: from 10-31 to 11-02, the iPhone version also jumped from #60 to #19 on the Korean Finance free chart, at the same time as the Android installs surged. It looks like the same exposure reached both sides. Whether it came from store recommendations, in-app push or community posts, I couldn't find out.

Where users come from: its own existing users

The main source is clear: its own existing users.

• The iPhone app is driving migration to Android. The 6.1.7 release notes say directly "you can now move to Android"; the first FAQ item on the official site asks "Can records on iPhone be moved to Android?"
• The migration path is smooth. On iPhone, go to "Settings › Backup & Restore › By Email" and send the whole ledger to yourself as a single weple.sqlite attachment. On Galaxy, open the attachment, open it with Weple, confirm the import, done. The Android app asks on first launch "Did you use this on iPhone?" The official migration help page even covers "what if the mail app renames the attachment to weple.sqlite 2.txt".
• The brand name captures search demand that had built up for years. Weple often shows up in Korean blog posts recommending budgeting apps ("가계부 어플 추천"). Android users searching "위플" on Play can finally find it (inference, no direct data).

I found no sign of paid ads (not finding them doesn't mean there were none), no news coverage, and almost no one on X in the past two months mentioned "Weple is on Android now."

For a budgeting app, old data is retention. The 8 user's comment said it plainly: after this many years of records, they won't switch to another app. So as long as the migration path works, these users almost certainly come back.

Where the money comes from: long-time users pay again on Android

A key line on the official help page reads: "Purchases on the App Store and Google Play are separate; Pro can't be transferred, only records can."

In other words, a long-time user who bought Pro on iPhone and moves to a Galaxy has to buy it again on Android. That is why an app with three weeks on the store and not a single rating can appear on the grossing chart: the first paying users aren't newly persuaded people, they're old users who already paid once. How much revenue that brings in is not visible from outside.

Who's nearby

The most worth looking at is Early Green Budget (초록가계부). Its author is a solo developer who in early 2025 posted on the developer community Nomad Coders with the title "Early Green Budget, a cleaner alternative to Weple." They wrote that while searching overseas for a budgeting app they found Weple, "didn't really like the UI or features, but saw so many people using it," and decided to build a cleaner one. Written in Flutter, with no ads, it reached 57k installs and ranked #11 on the grossing chart within about a year. It filled exactly the Android gap Weple didn't cover. Now that Weple has arrived on Android itself, part of that ground is likely being reclaimed (inference).

Why this one, and why now

Broken down, it comes down to three things: fifteen years of brand, a long-unmet Android need, and a smooth migration path. A calendar-plus-minimal product shape is why it won on iPhone back then, but this Android launch is gaining traction because of brand and existing users, not because Android has anything new. Without those 217k ratings behind it, a calendar budgeting app with the same design would not get this kind of speed on Korean Android.

Why did it take 2026 years to ship Android, and why didn't anyone outside notice? Two versions a day (10-27 v1.1 to 11-04 v1.4) suggests the team is scrambling to fix migration and new-device issues.

If it were you

C: You can learn something from it, but copying it isn't worth it. Its growth comes from things you can't get: fifteen years of brand, 217k ratings from long-time users, and in-app traffic from its own iOS app. Korean Android budgeting apps are already crowded with tens-of-millions-install incumbents and big-tech finance apps.

Good fit for: people who already have an older product on just one platform, who can port it over directly; or indie devs hunting for a "platform gap," following the Chocolo Budget route.

Bad fit for: anyone planning another calendar-style budgeting app in Korea. Weple just added Android, so the gap Chocolo Budget filled is narrowing. You have no brand and no legacy data, so why would users switch to you?

How to do it: two routes to borrow from. First, if you already have a single-platform product: on the day the other platform launches, post "you can move over now" in the old app. Make migration "one file, three steps," and ask on the new platform's first launch, "Have you used us on another platform?" Purchases don't carry across stores, so migrated users become the new platform's first paying customers. Second, go the other way and hunt for gaps: look in the Korean and Japanese App Stores for tools with 10k+ ratings that only exist on iPhone and where people in communities keep asking for an Android version. Build an Android alternative and compare it directly against the original in your store listing and recommendation threads.

How to get users: the second route relies on search and communities. In Korea, that means long-tail queries like "OO 어플 추천" and "OO 안드로이드" on Naver blogs, plus requests for alternatives on communities like ruliweb and Nomad Coders. Spell it out in your store title and description: "like OO, but on Android."

When to get in early: there's no deadline, but understand that gaps get closed by the original maker. Weple took fifteen years, while other established brands could ship Android tomorrow. Before you pick an idea, check whether its website or release notes already mention Android.

Signs you misread it: ① a month or two after Weple's Android launch, it drops out of the Korean Finance Top Grossing top 50 and daily installs fall back to double digits, meaning the old users moved over and there's no new growth; ② Chocolo Budget's installs and chart rank rise rather than fall after Weple goes to Android, meaning the "platform gap" wasn't the main driver of the alternative's growth; ③ Android reviews start filling up with "migration failed" and "having to pay for Pro again is annoying," meaning charging twice has a cost.