About Us
Last updated: October 7, 2026
1. Operator Information
| Operator | TETRAS Ltd. |
|---|---|
| Location | Yachiyo, Chiba, Japan |
| Founded | November 2015 |
| Business | Software planning, development, and operations / Internet media planning and operations |
| famikan@tetras-ltd.com | |
| Website | https://tetras-ltd.com |
2. About FAMI-KAN Tips
FAMI-KAN Tips is a media platform offering practical guides on bill splitting and group expense management. We cover every scenario from travel and dining to shared living.
3. About the Author
KZ (Licensed Architect / Developer of FAMI-KAN)
A licensed architect by profession and a parent of two. Having served as the organizer for countless trips and events since student days, KZ spent nearly two decades wrestling with the hassle of splitting bills — and eventually built the bill-splitting app FAMI-KAN single-handedly, despite having no prior programming experience. The articles on this site are written and supervised based on this first-hand experience and the insights gained through developing the app.
Why I Built FAMI-KAN (Developer Story) →4. More from the Developer
Articles KZ has written outside this site, plus the official social accounts. note covers the story and thinking behind the app; Qiita covers what was learned technically while building it. Both are in Japanese.
note
- 【2026年最新】実際に試したなかから選ぶオススメの割り勘・立替精算アプリ
2026-10Tested 10 bill-splitting apps and compared the top 4 with identical trip data.
- 【海外旅行の罠】「ドルで割り勘」はなぜ損をする？ 帰国後に友達関係を壊さないための「為替・クレカ・現金」の鉄則
2026-07How to handle exchange rates, cards and cash when settling an overseas trip.
- 「子供の費用、どうする？」——BBQや旅行の精算で誰も言い出せない問題を整理した
2026-05The question nobody raises: how much should a child's share be?
- 「合法のAI」は免罪符か。クックパッド炎上から考える、個人メモと搾取の境界線
2026-04An essay on AI and the line between personal notes and exploitation.
- クックパッド炎上の本当の恐ろしさ。なぜ彼らは「誰もが勝てるWin-Winの仕組み」を自ら捨てたのか？
2026-03An essay on platform ecosystems and why win-win structures get abandoned.
- 割り勘アプリを作ったけど、まだ作ってよかったとは思えない話
2026-03An honest account of the first month after launch.
- 一級建築士がプログラミング歴ゼロで「割り勘アプリ」を作った話
2026-03Why a licensed architect with zero programming experience built a bill-splitting app.
Qiita
- 世界No.1アプリも抱える、割り勘アルゴリズムに隠された「不都合な真実」〜なぜ、送金回数の最小化（貪欲法）をデフォルトにしてはいけないのか？〜
2026-05Why minimizing the number of transfers can clash with how people actually feel.
- プログラミング歴ゼロの個人開発アプリ、2ヶ月目に気づいた「AIの前に人間がやること」
2026-04What a human has to decide before handing work to AI.
- プログラミング歴ゼロの個人開発者が、GA4・UTM・サーチコンソールと格闘した1ヶ月の記録
2026-03A month of wrestling with GA4, UTM parameters and Search Console.
- 一級建築士がプログラミング歴ゼロでWebアプリを2本リリースした話【AI駆動開発の実践記録】
2026-03A practical record of AI-driven development.
Official accounts
5. Editorial Policy
Our articles are written based on the real experience and expertise of KZ, our developer and author, with fact-checking. Descriptions of app features are verified to match the actual specifications. While we monetize through advertising, ads never influence our editorial content.
6. Contact
For inquiries about our operations, please reach out via the contact page.
Go to Contact Page →