rainsday GROUP A Hong Kong studio for iOS, web, automation, and brand systems. We turn rough ideas into working product with the craft to make them feel inevitable.
Direction rainsday
Selected work
これまでに手がけてきたプロジェクト。
Selected iOS apps, vibe-coded tools, and design systems
shipped under the rainsday name. Small teams, high polish, no dead decks.
A native iPhone finance app for trip costs, shared purchases, requests, multi-currency tracking, and clear final settlements. Available now on the App Store.
Open App Store↳
A native iOS contract-style relationship app. Built with Vibe Code over weekends, polished for the launch edition.
Ask about it↳
A standalone browser study tool with 310 grammar prompts, level switching, mistake history, and weak-point practice for focused Japanese revision.
Open lab↳
CSV / chat-log / Excel analysis with a designer's output sensibility. Reports that ship-ready, not summaries that get re-edited.
Ask about it↳Approach
rainsday は、設計から実装、運用までを通しで手掛ける studio。
小さな habit と shipping discipline。その積み重ねが、
毎回の product を確実に届ける土台になります。
Business
Business 01
Business 02
About rainsday
rainsday は香港を拠点とする design & technology studio。
iOS、web、automation、document systems、brand。
「to ship」を品質の基準として、設計から運用まで一貫して
手掛けています。
Work together
新規 commission、partnership、advisory engagement。
プロジェクト概要と希望スケジュールをご記入の上、
下記メールアドレスまでご連絡ください。1営業日以内に
ご返信いたします。
