Product design
Interface and interaction design for mobile apps, from first sketch to shipped screen. We design in the open and revise against real usage.
Beijing · Est. 2023
We build tools that measure what you actually remember.
北京翊行天下科技有限责任公司 Beijing Yixing Tianxia Technology Co., Ltd.Beijing Yixing Tianxia Technology Co., Ltd. is an independent software company focused on learning and focus. Most study tools count hours. We think the only number that matters is what survives after the session ends.
In development
Deephour
A focus timer that ends with a question instead of a notification.
Every focus session closes with a short recall check. The app turns your own notes into questions, grades the answers, and gives you a retention score — so you know whether the last hour actually stuck. Forgotten items return on a spaced schedule until they stop slipping.
- Timed focus sessions with configurable app blocking
- AI-generated recall questions from your own material
- A retention score tracked per topic, over time
- Spaced review queue built from what you missed
What we do
A small studio, product-first.
Mobile engineering
Native iOS development in Swift and SwiftUI, with Android planned as a second phase. Local-first data, privacy by default.
Applied AI
Language models used for a specific job — generating questions, grading answers, surfacing what you forgot — rather than as a feature in itself.
2023
Founded in Beijing, China
1
Product in active development
Local-first
Study content stays on device