kensaurus合同会社 — kensaurus LLC

Tokyo studio in Shibuya building software, mobile and web apps, IoT systems and 3D, photography and video, and the revival of empty buildings and rural places. Founded 2025-06-06 by Kenji Sakuramoto. Operating in English, Japanese, Chinese, Thai, Vietnamese, and Malay.

What we ship

Everything below is public and running today unless it is marked in development: mobile apps, web apps, a live camp dashboard and AI tools.

Live projects

  • Work & Camp — 嬬恋牧場Work&Camp

    A mountain campground, booking system and all. The campground as a business: our 1,444 m telework camp. Fiber office, pets welcome, car camping from ¥3,500 a night. The booking site, payments, AI concierge and live cameras are our own code, and なっぷ bookings are copied into the same system.

  • Ranch Plan — 牧場計画

    The five-year plan for an old ranch at 1,444 m. The plan to bring the buildings on a former ranch in Tsumagoi back to life as a mountain telework camp, one phase at a time.

  • Tsumagoi Ranch — 嬬恋牧場

    The live screen for our camp in Tsumagoi: room temperatures, cameras, and who's on site, from anywhere.

  • Project Ledger — 日報台帳

    Daily reports, kept like a ledger. A ledger of daily work across our projects: who did what, on which day, and for how long.

  • Solo Boss — 一人社長

    Year-end statements and e-Tax files from your books. Keep your books in the accounting software you already use. Solo Boss turns its journal export into the year-end statements, the tax schedules and the e-Tax filing file. AI drafts, you confirm, and you submit through the NTA's e-Tax software. Everything is free for now.

  • Wedding Kiosk — 結婚式受付端末

    A kiosk for a wedding dinner: photo booth, the couple's story and the schedule, plus an RSVP page for the beach wedding.

  • Skin Analysis — 肌診断

    Skin analysis from a single selfie. One selfie, twenty-odd skin scores and some care tips.

  • ProjectFlow — プロジェクト管理

    Projects, estimates and invoices in one flow. One screen for the project, the invoice, and the part where your team forgets what's next.

  • glot.it — タイ語学習

    A Thai tutor that talks back. A Thai-learning app for the kind of learner who's tried three other apps and bounced. (App Store · Google Play)

  • help her take photo — 写真撮って

    A live remote camera for couple photos. For when 'let me see it… is that all?' needs to stop happening. (App Store · Google Play)

  • yen-yen — 家計簿

    A household money book for two, no bank link. A household kakeibo: where the money went, and what's due next. (App Store · Google Play)

  • Konte — コンテ

    Template to 8-second AI video, one step at a time. A prototype that takes a template through script, visual and review to an 8-second AI video. First built for our partner babuu AI.

  • the wanting mind — 渇望する心

    A long book about wanting things: free to read on the web, with narrated chapters and a book you can ask questions. (App Store · Google Play)

  • Mushi Mushi — 虫虫

    Bug intel for when the graphs lie. For when the user knows something's wrong but the monitoring tools still show green. (GitHub)

  • lets-talk — 会話の練習

    Practice hard conversations, scored. Practice for the texts that get tense: write a reply and get it scored, role-play a hard chat, or read short notes on how people talk. (App Store · Google Play)

  • Hear, Hear — 録音・文字起こし

    The room, as text, while it talks. Words appear as the room speaks, each line keeps its timestamp, and it exports to TXT, Markdown, Word or SRT. No account; recordings and transcripts are saved only in your browser.

  • kenji skills — エージェント用スキル集

    Agent skills, slash commands and subagents for Claude Code, Cursor, Codex and Gemini. Each skill is a written procedure the agent follows step by step. Open source, installed with one npx command. (GitHub)

In development

  • Bento — 弁当

    An AI workspace built around one loop: plan, capture, make, review, ship. (In development)

Writing

  • 声調ひとつで「馬」が「犬」になる。自分の言葉で覚えるタイ語アプリ glot.it (kensaurus, 2026-10-16)
  • One tone off and “horse” becomes “dog”: why I built glot.it for Thai (kensaurus, 2026-10-16)
  • 「ちょっと見せて…消して」をなくしたくて作ったカメラ (kensaurus, 2026-10-16)
  • A camera for the “let me see… delete it” moment (kensaurus, 2026-10-16)
  • 「完了しました」で止まるエージェントに、手順書と完了の関門を渡す (kensaurus, 2026-10-16)
  • My agents kept saying “done” when they weren't, so I wrote the playbooks down (kensaurus, 2026-10-16)
  • 言いにくい返事を、送る前に練習する lets-talk (kensaurus, 2026-10-16)
  • lets-talk: rehearse the message you're dreading (kensaurus, 2026-10-16)
  • このアプリたちを作っている人のこと (kensaurus, 2026-10-16)
  • Who makes these apps, and why (kensaurus, 2026-10-16)
  • 「人はなぜ欲しがるのか」を追う、読んで聴ける本 the wanting mind (kensaurus, 2026-10-16)
  • the wanting mind: a book about why we want, to read, hear and ask (kensaurus, 2026-10-16)
  • 銀行とつながない、夫婦で続ける家計簿 yen-yen (kensaurus, 2026-10-16)
  • yen-yen: a money book for two that never touches your bank (kensaurus, 2026-10-16)
  • From "this is broken" to a fix PR I merge by hand (DEV, 2026-10-15)
  • 空置されていた牧場の建物を、仕事ができる場所にするまで (note, 2026-10-15)
  • 管理画面の中身を、もう少し:朝の画面、売店、Wi-Fi、集客 (note, 2026-10-15)
  • 半径7kmに民家のない、標高1,444mの元牧場です。 (X, 2026-10-14)
  • エラーにならないバグ(押しても反応しないボタン、12秒かかる画面)を拾うOSS、Mushi Mushiを作っています。 (X, 2026-10-13)
  • 「このバグを直して出して」で手順が走る、エージェント用スキル集の中身とインストーラの安全設計 (Zenn, 2026-10-13)
  • 「夕ご飯作った。食べた。それから、無事かどうか考えてた。」にどう返す? (X, 2026-10-12)
  • 言いにくい話を、送る前に練習するアプリを作っています (note, 2026-10-11)
  • タイ旅行の前に、屋台で注文できるくらいのタイ語を。 (X, 2026-10-11)
  • KENSAURUSでつくっているもの (X, 2026-10-10)
  • 山のキャンプ場を、ひとつの管理画面で動かしている話 (note, 2026-10-09)
  • 山のキャンプ場を夫婦二人で回すために作った管理画面の話を書きました。 (X, 2026-10-09)
  • ESP32・カメラ・Wi-Fi・決済を、山のキャンプ場の管理画面ひとつにまとめた (Zenn, 2026-10-09)
  • 銀行連携なしで、夫婦で続けられる家計簿アプリ「yen-yen」をつくりました (note, 2026-10-08)
  • ひとり法人の決算ツールを作り、自分の申告で間違えて直した話 (note, 2026-10-08)
  • 「人はなぜ欲しがるのか」を追う、無料で読める本を作っています (note, 2026-10-08)
  • 標高1,444mの元牧場で、光回線のオフィスとキャンプ場をはじめました (note, 2026-10-08)
  • 山にオフィスを立てた。 (X, 2026-10-08)
  • 「人はなぜ欲しがるのか」を追う本「the wanting mind」を作っています。 (X, 2026-10-08)
  • アプリ内のバグ報告をMCP経由でエディタに渡す仕組みと、その設計 (Zenn, 2026-10-08)
  • Two months ago my wife and I opened a small campground and coworking space on an old ranch in Tsumagoi, Gunma, 1,444 metres up. (LinkedIn, 2026-10-07)
  • Thai has five tones. One slip and "horse" (ม้า) becomes "dog" (หมา). (Bluesky, 2026-09-14)
  • A 147,000-word interactive book as a free SPA, and the stack behind it (DEV, 2026-04-23)

Services

kensaurus operates across 11 business categories: AI / Software / Mobile, Web / SaaS / PWA, IoT / 3D / センサー, 写真 / 映像 / 編集, 記事 / 映像 / 配信, キャンプ / テレワーク / アウトドア, 共同作業 / オフィス / ラウンジ, 空き家 / 改修 / 活用, 地方創生 / 田舎 / 関係人口, SEO / 広告 / 集客, and セキュリティ / 移行 / データ.

Contact

kensaurus合同会社, 東京都渋谷区道玄坂1丁目, Shibuya, Tokyo, Japan. Founded June 6, 2025. Capital ¥1,000,000. Representative: Kenji Sakuramoto (櫻元賢次).