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🌐 日本語 | English

KazuTaka App Studio — smartphone apps for work and everyday life

An indie app catalog

Exam study, writing, map quizzes and everyday paperwork. Here are the apps I publish for iPhone and Android, sorted by what you can do with them. Most apps are in Japanese.

Popular apps

Shoron Sensei★ 4.7Bungo wa Shiru★ 4.4Train Quiz★ 4.7History Reincarnation★ 4.7

Use it in your browser

No install needed. Open these apps right in your browser, on a PC or a phone. (The apps are in Japanese.)

Map quizzes

Airport Code Quiz空港地図Learn airport codes by finding them on a world mapOpen in browser › Road King道路王Learn Japan’s roads and highways through map quizzesOpen in browser › Train Quiz駅地図Learn where Japan’s stations are by tapping the mapOpen in browser ›

Everyday tools

Calendar Studioカレンダー工房Make a photo calendar to print or save as PDFOpen in browser ›
New releases

Released apps 39

Learn & exams

9 apps

Exam apps that answer the “why?” of self-study, plus tools for languages and daily study.

Takken AI 2026Takken AI 2026宅建AI 2026Exam prep for Japan’s real-estate agent (Takken) qualificationRead more (JP) »
App Store
Registered Distributor AI 2026Registered Distributor AI 2026登録販売者AI 2026Study support for Japan’s registered distributor examRead more (JP) »
App Store
Travel Business AI 2026Travel Business AI 2026旅行業AI 2026Exam prep for Japan’s travel business manager qualificationRead more (JP) »
App Store
AI Sensei Joho-IAI Sensei Joho-IAI先生情報ILearn Japan’s Common Test “Information I” pseudo-code through quizzesRead more (JP) »
App StoreGoogle Play
Study CalendarStudy Calendar勉強カレンダーA simple planner combining study schedule, timetable, to-dos, and time trackingRead more (JP) »
App StoreGoogle Play
AI Vocab BookAI Vocab BookAI 単語帳(多言語)Make vocabulary books in 16 languages with AIRead more (JP) »
App Store
AI Vocabulary BuilderAI Vocabulary BuilderAI で作る英単語帳Make your own English vocabulary book with AIRead more (JP) »
App Store
DungeonLangDungeonLangAI generates language quiz questions tailored to youRead more (JP) »
App Store
Quiz LabQuiz LabクイズラボGenerate quizzes across genres with AIRead more (JP) »
App Store

Write & create

9 apps

Novels, essays, diaries and letters. Apps that turn what you want to say into writing with AI.

Bungo wa ShiruBungo wa Shiru文豪はしるAI writes a novel starring your favorite characterRead more (JP) »
App StoreGoogle Play
Shoron SenseiShoron Sensei小論先生Enter a topic and get an essay draftRead more (JP) »
App StoreGoogle Play
AI DiaryAI DiaryAI 日記帳A diary in 20 languages, with help from AIRead more (JP) »
App Store
Daihitsu DollDaihitsu Doll代筆ドールAI ghost-writes the letter you needRead more (JP) »
App Store
Shukatsu no MikataShukatsu no Mikata就活のみかたAI helps you write your résuméRead more (JP) »
App Store
Kikaku no MikataKikaku no Mikata企画のみかたSort out your planning ideas with AIRead more (JP) »
App Store
PR MakerPR MakerPR メーカーTurn what you want to say into promotional copyRead more (JP) »
App Store
Oshi MakerOshi Maker推しメーカーAI recreates how your favorite character talksRead more (JP) »
App Store
Multi-language TalkMulti-language Talk多言語トークTranslates what you say on the spotRead more (JP) »
App Store

Play & map quizzes

8 apps

Quizzes you answer by tapping a map, and story games you play along with AI.

Train QuizTrain Quiz駅地図Learn Japan’s railway lines by tapping the mapRead more (JP) »
App StoreGoogle Play🌐 Play in browser
Airport Code QuizAirport Code Quiz空港地図Learn IATA/ICAO airport codes by tapping a world mapRead more (JP) »
App StoreGoogle Play🌐 Play in browser
Road KingRoad King道路王Learn Japan’s roads and highways through map quizzesRead more (JP) »
App StoreGoogle Play🌐 Play in browser
Map GameMap Game地図ゲームLearn geography with quizzes you answer on a mapRead more (JP) »
App Store
Quiz Japanese Hot SpringsQuiz Japanese Hot Springsクイズ日本の温泉Learn where Japan’s hot springs are through quizzesRead more (JP) »
App Store
History ReincarnationHistory Reincarnation歴史転生An RPG where you live a historical figure’s “what if”Read more (JP) »
App StoreGoogle Play
Mugen TairikuMugen Tairiku無限大陸A story RPG where you create the world of your adventureRead more (JP) »
App StoreGoogle Play
AI Art MuseumAI Art MuseumAI 美術館Meet famous paintings with AI commentaryRead more (JP) »
App Store

Life & work

13 apps

Tax returns, property prices, on-site reports and daily records. Apps that cut down tedious work.

Business Card ReaderBusiness Card Reader名刺読取Snap a business card to file it. Reading happens on your iPhoneRead more (JP) »
App Store
Work Report AIWork Report AI作業報告AIAI turns photos and notes into a work reportRead more (JP) »
App StoreGoogle Play
Forklift Inspection LogForklift Inspection Logフォークリフト点検簿Monthly inspection records, kept for three years on your phoneRead more (JP) »
App Store
Property Price MirrorProperty Price Mirror物件査定Check property prices against actual sale recordsRead more (JP) »
App StoreGoogle Play
Town CompareTown Compare街くらべCompare livability on five axes using public dataRead more (JP) »
App Store
Medical Receipt OrganizerMedical Receipt Organizer医療レシートCompare Japan’s two medical tax deductions and see which saves moreRead more (JP) »
App Store
Grave-Visit ReportGrave-Visit Report墓守レポートMake grave-visit service reports in no timeRead more (JP) »
App StoreGoogle Play
TabiPlanTabiPlan旅プランReorder your stops and the itinerary is calculated automaticallyRead more (JP) »
App StoreGoogle Play
Calendar StudioCalendar Studioカレンダー工房Make a calendar from your photos to print or use as wallpaperRead more (JP) »
App Store🌐 Use in browser
AnyBookmarkAnyBookmarkShow your favorites in a home-screen widgetRead more (JP) »
App Store
Cho LogCho LogちょうログTrack bowel movements to support gut healthRead more (JP) »
App Store
AI IzakayaAI IzakayaAI 居酒屋Snack recipes that go with your drinkRead more (JP) »
App Store
Kenko RecipeKenko Recipe健康レシピDishes suggested to match your requestsRead more (JP) »
App Store

📰 News

Latest updates. Items marked (Japanese) are available only in Japanese.

📬 Contact & Legal

Note: Our Terms of Service and Privacy Policy are written in Japanese only. Key points about external services (Firebase, AdMob) and account deletion are summarized in Article 7 of the Privacy Policy.

🌐 日本語 | English