Ouen did not start with a fan. It started with a table of search numbers, and the table said the same thing three times.
In Japan, oshi-katsu (推し活) is the habit of supporting the idol, actor, VTuber or character you love: concerts, merch, photocards, lottery tickets, travel to the other end of the country for a show. Industry estimates (Nikkei xTrend and the 推し活総研 research group) put it at about ¥4.1 trillion in 2026, around 19 million people, roughly ¥210,000 a year each. Guides written by fans describe keeping all of it in Google Calendar, Notion and a memo app, glued together by hand.
What the search data said
I looked at the most-searched terms in the App Store across the twelve storefronts I track. Fan vocabulary only shows up in Japan and Korea. In Japan three terms stood out:
- うちわ文字作成 (make the letters for a fan sign): popularity 70, and the top result has 38,000 ratings, but the rest of the top five run from about 300 to 8,000.
- 推し活貯金 (oshi savings): popularity 66, difficulty 15. The number one app has under 500 ratings; eight of the top ten do.
- グッズ管理 (merch management): popularity 59, difficulty 15. Same shape: eight of ten under 500 ratings.
A big search term with weak incumbents is the best case. So the question was what single app a fan would want open on the train to a show.
The sign maker is the hook
An uchiwa is a paper fan that fans decorate with a message and hold up at a concert: “wave at me”, “point at me”, “wink”. The way people make one is concrete. You print one big letter per page, cut the letters out, glue them onto a plain fan, and hold it up. A phone screen is unreadable from the back of an arena, which is why the printed fan wins.
So Ouen’s sign maker prints one outlined letter per page on A4 or A3, with crop marks, and saves the whole fan as one image for posting. There is also a full-screen mode for the moments you do hold up a phone. It uses chunky Japanese and Korean fonts, because the existing sign makers’ loudest requests were double and triple outlines, two-line text, glitter and Korean fonts. Saving and printing are free, always. That is the install hook and the trust.
What 660 reviews wrote into the free tier
I read about 660 recent Japanese reviews of the sign makers and the oshi apps. They are blunt.
- The sign makers’ number one complaint is ads, and 37 of the 53 mentions were one- and two-star.
- Number two is a paywall on saving: “¥880 a month, ¥7,800 a year is too much”.
- Blurry A3 prints from convenience stores.
- On the oshi apps, the number one cause of a one-star review was lost data, and next to it, “¥4,000 to ¥5,000 just to add an oshi is too much, we are students” and “a savings app that pushed premium on open felt wrong”.
Those became rules instead of preferences. No ads, ever. Saving and printing a sign are never blocked. A locked option is never silently applied, so you cannot end up with a sign you cannot save. The paywall appears when you tap something locked, once after your first print, and in Settings, but never on launch. The free tier keeps one oshi, one goal, 30 merch items and three upcoming events, and Ouen Plus is monthly, yearly with a trial, or a one-time lifetime purchase, priced below the apps people complained about.
The version I threw away
The first build had five tabs, a Home dashboard and a Tools list, and a four-step onboarding. When I tried to explain it to myself in one sentence I could not, which is the signal. So I cut it: one welcome screen that says what the app is for, with two doors in (make a sign now, or add your oshi first), and four tabs, with the sign maker first and working without any oshi at all. The savings, merch and event tabs show a short explanation until you have one.
The oshi lives in a chip at the top of every tab. Its member colour tints the app, and the “supporting for N days” counter is the first thing you see.
Why it is called Ouen
I called it Oshi until I searched the App Store for the name: 27 apps already used the word, including the number one result for my main keyword. So the name became Ouen. 応援 (Japanese), 응원 (Korean) and 应援 (Chinese) all mean cheering on someone you support, and the word reads the same in my three biggest fan storefronts.
What’s next
Ouen is live on the iPhone App Store in ten languages. An Android version is built and in testing. iPad and iCloud backup are planned. A scrolling-text mode is something I am weighing for Korea, where fans hold up phones with scrolling messages.
Ouen’s product page has the screenshots and the FAQ. If you have been burned by an app that held your own saving hostage, the free tier is the whole sign maker.