Cubby (知物) is a small app for anyone who keeps losing track of where they stored things — the passport, the spare key, the charger, the winter blankets. Its tagline is the whole idea: one tap, one line — find it later.

Instead of forms or categories, you say or type one sentence, like "spare key in the hallway drawer", and Cubby files it into a little box in the right room. When you need it later, search a word and Cubby shows you which box it's in, and which room that box is in.

Cubby's Find screen: every place shown as a little isometric box, grouped by room — Find: every place as a little box, grouped by room. Rooms: boxes placed in a room you can walk through.

Cubby's Rooms screen: boxes placed in a room you can walk through — Find: every place as a little box, grouped by room. Rooms: boxes placed in a room you can walk through.

Highlights

One line to remember — type it or dictate it; there are no fields to fill in.
Boxes and rooms — places show up as little isometric boxes, grouped by the room they're in.
No account, no sign-up, no ads. What you note is stored on your device. (Privacy policy)
Free at its core — optional one-time purchases add extra box materials and a night theme.

Built with Flutter — one codebase for iOS and Android — with on-device SQLite, every visual drawn in code rather than image assets, and StoreKit / Google Play Billing for the in-app purchases. Available on the App Store and Google Play.