A 12-second screen recording and "should I release it?": a Japanese student nudged a fridge dessert app into existence

OAZUKE (おあずけ) is a focus app from a Japanese indie dev that helps you stop using your phone: set a timer, put the phone down, and when time's up you've "chilled" a cute dessert in your fridge. The mechanic is basically the same as Forest from over a decade ago, but before launch it asked students on TikTok "should we ship this?" and went live right in summer break, collecting 2,369 ratings in three months. The main thing to learn is the go-to-market; as a business, the users are students with weak willingness to pay, and copycats are already piling in.

A screen recording with a debug switch

In 2026 Aug 5, the developer's own TikTok account @oazuke_app (still only 1,450 followers today) posted a 12-second phone screen recording. The frame shows a retro pale-yellow fridge with the caption 「こんな作業アプリ欲しい?」(Do you want a work app like this?). Select "study time," the fridge door opens, a pudding goes in, the door closes, and the countdown runs from 0:05 to 0:01, captioned 「スマホを触らなかったらスイーツができるアプリ!!」(An app where if you don't touch your phone, a sweet gets made!!). The last frame shows a notification 「プリンが冷えました」(The pudding has chilled), with the line 「リリースするか迷ってます🥺」(I'm torn about whether to release it 🥺).

Look closely at the first frame and a switch is still visible in the bottom left: 「デバッグ:5秒で完成」(Debug: completes in 5 seconds). This was still a version in development.

By Nov 6 this video had 102k views and 148 comments (TikTok). The comments are almost all one word: 「欲しい」(I want it). The most-liked ones are already drafting a feature list for him:

「プリン以外もいろいろあるようにしたらもっと神!」(If there were more than just pudding, it'd be even more amazing!), 68 likes 「タイマーが終わるまえにスマホ触ったら、おやつが失敗した状態で出てくるとか…」(What if touching your phone before the timer ends makes the treat come out failed…?) 「Androidでもいけますか?あと、いつ出ますか?」(Will it work on Android? And when will it be out?)

Two days later he posted another one, 「迷ってるので欲しい人コメントください」(I'm still undecided, so please comment if you want it). It got 20k views and 117 comments, and another batch of requests came in: better desserts for longer study sessions, changeable fridge colors, stickers, music during study, and study logs. Most of these were eventually built into the app.

In Aug 14, the app launched on the App Store.

What it is

The developer is Raizo Kawaguchi (川口), @RaiAppDev on X. He writes Flutter and Swift, has 1,800+ followers, and this is his 5st app.

The app name is just four characters, 「おあずけ」, the Japanese word for telling a dog to "wait, don't eat yet." The subtitle reads 「スマホを置くと、おやつが冷える」(Put down your phone and your snack chills). How it works:

• Pick what you're doing (study, work, reading, chores) and a duration, then start "おあずけ"; touch your phone mid-session and the cold air escapes.
• Stick it out to the end and you randomly get a dessert, which goes into your collection; the longer you focus, the bigger the dessert, and this month's desserts fill a jar.
• Change the fridge color and add stickers; stickers unlock based on cumulative time.
• Uses Apple's Screen Time API to lock distracting apps, letting through only what you need for study.
• Add friends: visit your friends' fridges and compare who's collected more desserts this month.

Free to download; membership ¥300 per month, ¥2,400 per year, or ¥4,800 one-time purchase; free users must watch a rewarded video ad to use app lock (App Store page, 11-06).

How big it is now

It reached 75 ratings within 2,210 days of launch, roughly 29 per day, faster than now. Of the 130 written App Store reviews it could pull, 61 came in August, 32 in September, and 32 in October; August was the peak (inferred: the summer-break wave). Activity picked up again at the end of October, matching midterm exams and two "受験生" (exam candidate) videos.

Not big: the veteran competitor 「スマホをやめれば魚が育つ」(Quit your phone and fish grow) has 16.4k ratings, and FocusFlight, launched in January this year, has 28.3k. But of the dozens of small Japanese phone-quitting apps launched over the past 2026 years, most stall at tens to a few hundred ratings; this one is one of the few that broke out.

Where users came from: almost entirely the founder's own TikTok account

The biggest wave came the day after launch. On Aug 16, the account posted a 6-image carousel: 「こんなアプリ欲しい?」(Do you want an app like this?) → 「勉強時間決めて」(Set a study time) → 「その間スマホを触らなかったら」(If you don't touch your phone during that time) → 「スイーツが作れるアプリ!!」(An app that makes sweets!!) → 「色んなステッカーで自分だけの冷蔵庫も作れちゃう」(You can even make your own fridge with all kinds of stickers) → final slide 「『おあずけ』で検索してみて」(Try searching for "おあずけ"), with a screenshot of the App Store search results.

By Nov 6 this carousel had 465k views, 20.3k likes, and 7,202 saves (TikTok). There's no plot and no real person; it just lays out four screenshots of the app, and the last slide shows you how to find it.

Keep posting in this format. Late August: 「ドパガキ卒業しない?」 (Want to graduate from 'dopa-gaki'? Dopa-gaki refers to people who can't stop scrolling on their phones) and 「瓶にスイーツがたまる機能欲しい?」 (Want a feature where sweets pile up in a jar?), each getting 2–60k views. Oct 1「受験生におすすめアプリ」 92k, Oct 15「勉強中どんな音楽きいてる?」 (What music do you listen to while studying?) 127k. Up to 11-06 the account has 29 videos, about 1.24M views and 1,450 followers (TikTok).

The reviews match. Of 130 App Store reviews, 32 say they came from TikTok: "リリースする前から『なにこれ?!欲しい!』って思ってた" (Before it even launched I was thinking "what is this?! I want it!", 08-28), and "TikTokを見てて楽しみにしてて ついにリリースされて" (I'd been watching on TikTok and waiting, and it finally launched, 08-24).

Other channels are minor. The developer Aug 15's launch post on X got 188k views and 1.3K likes, mostly spread within the Japanese indie dev circle. The friends feature brought some word of mouth, with about 6 comments like 「友達に教えてもらった」(a friend told me about it). Searching TikTok only turns up the developer's own account's videos, and no other creators promoting it. The videos carry a #pr tag, but whether they hired someone to run the account or paid for promotion is unverified. I found no ads running, but not finding them doesn't mean there were none.

Why it took off

Demand was validated before launch. The Aug 5 screen recording still used a debug build; they built a screen-recording interface and went to ask. On launch day a group of people was already waiting, and more than one commenter wrote that they had been waiting before the release.

Timing is locked to summer break. Aug 14 lands mid-way through Japan's summer holidays, with students caught between homework and phones they can't put down. Reviews include "夏休みの宿題乗り切れそう" ("looks like I can get through the summer homework"). Before October exam season it pushed "受験生" videos, which brought in a second wave.

A metaphor you understand at a glance and can film straight away. Putting the phone down means "put the snack in the fridge to chill," and picking up the phone makes it run away. Reviews keep praising exactly this: "スマホを置くとおやつが冷えるという発想が素晴らしい" (Putting down your phone chills your snack, what a brilliant idea). The retro fridge plus stickers also hits the cute aesthetic that junior and senior high school girls in Japan like. One user wrote "友達に、なにこれ!?可愛い!!って褒められた" (My friend asked what this was and said it's so cute).

The comment section acts as the product team. In three months it shipped over a dozen versions. Free sweets grew from 3 kinds to 9, and friends, the sweets jar, a stopwatch, background music, widgets, and streak protection rolled out one after another, many directly from TikTok comments. One review says "言っていたら増えていました" (I said something and it actually got added). Each new feature then became a "Do you want this?" video.

A theme alone isn't enough. An earlier app on the same theme, "クリームタイム" (bakes sweets and opens a dessert shop, launched July 2025), has only 39 ratings in Japan. The developer's previous app, macalo, from April, also turned behavior into sweets and has only 29. The difference is whether someone was talking to students one by one on TikTok.

What users are complaining about

Under the August 16 image set, one of the most-liked comments reads "Android版出したら叫んでほしいです!!" (Please shout at me when the Android version comes out!!), with 388 likes; "Android用……待ってます" (Waiting for the Android version…) got 188 likes. The Android version didn't ship until October 19, and still used English store copy. By 11-06 it had about 1,100 installs. Most Android users missed the summer wave.

On money, about 17 reviews complain that too much is paid and it's unfriendly to non-paying users. In August, for example, someone wrote "無料だとスイーツ三個しかもらえない" (On free you only get three sweets; later free sweets were raised to 9 kinds). Some did pay: "10日ほど使用してすごく良かったので買い切り課金しました" (I used it for 10 days, liked it a lot, and bought the one-time purchase). It has never charted in Top Grossing. The entry bar for productivity Top Grossing is low, so revenue is probably still small (inference). Its users range from fifth graders to university students, with students as the core.

Who it's competing with

(App Store, 11-06; Focus Bakery and Hamster Domino data as of around 11-06)

The English-speaking world has cute growth-focus apps like Finch, Study Bunny, and Hank Green's Focus Friend, but their Japanese localization is weak. Conversely, おあずけ's language list already includes Korean and Traditional Chinese, though those markets have not yet produced volume.

If it were you

Grade: B. The playbook is more worth copying than the product: the step of asking "should I launch?" on TikTok before shipping costs almost nothing, and an account with fewer than 1,000 followers still pulled 100K views. But the weaknesses of the business are also obvious: the mechanic is already overdone, the users are students who pay little, and success depends mostly on whether you can keep producing viral short videos. Companies like Shikudo are already moving into the same theme.

Who it suits: one or two people, one of whom can build iOS (the Screen Time API requires native code), and another person (or the same one) willing to post on TikTok every two or three days and who understands the memes of students in a given country. The best market is one where students face heavy exam pressure, study accounts are active on TikTok, and no local "cute phone-quitting app" exists yet (inference: South Korea and Taiwan are worth looking at first).

Who it doesn't suit: people who only want to write code and don't want to make content every day; anyone who wants to build another sweets-fridge app in Japan (the theme is already covered by it, Focus Bakery, and Hamster Domino); anyone hoping to make big money from this, since student spending is limited and it has never charted in Top Grossing itself.

How to do it: change the market or the visuals, and follow its sequence. Use AI or Figma to build a fake, recordable prototype (its first video used a 5-second debug build), then post "Should I launch this?" Put the most-liked requests into v1. Launch on Android and iOS together, so you don't repeat its mistake of missing Android users over summer. For monetization, copy its three tiers (monthly, annual, one-time purchase) and add rewarded video ads, but make the free tier generous so students don't feel they get nothing without paying.

How to acquire users: your own TikTok account is the main channel. Copy the format of the August 16 image set: 4–6 screenshots explaining "set a time → don't touch your phone → get a reward → decorate," and a final slide saying "search XX to try it," paired with a screenshot of the store search (the app name should be short and easy to search). Afterward, frame every new feature first as a "Do you want this?" question, use the comments to collect demand, and build a waiting crowd. Friend comparisons and monthly competitions should be built early, since students will pull their classmates in themselves.

When to launch: a student's calendar sets the schedule. Japan's next windows are around the January common exam and the March spring break; if you enter a different market, launch before the new school year starts in March 2027, with teaser videos going out two or three weeks earlier. Focus Bakery is set to launch 2027-01-21, so to claim position in Japan with the same theme you need to get there before it does.

What signs say you got it wrong: ① your "Should I launch?" videos have run three or four times with views only in the thousands and no comments saying "I want it": the theme isn't landing in that market, so change the visuals and try again rather than forcing it; ② おあずけ's daily new ratings fall back to single digits after exam season and never recover, showing that this kind of app only lives on seasonality and can't retain users; ③ within a month of Focus Bakery launching, it outranks おあずけ on the free productivity chart in Japan, showing that a follower backed by a company can take over this theme directly, and that an indie developer's window is shorter than expected.