01iOS · Korean learning
Kordly
A Korean vocabulary app built around word cards, spaced repetition and contextual practice for TOPIK learners.
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PORTFOLIO · 2024—2026Independent Developer
into products
Hi, I’m YU YI.I build things I wish existed.An independent creator exploring apps, websites, AI, and digital experiences.
Explore fourteen projects↓06APPS ON THE STORE
03LIVE WEBSITES
05GAMES ON TAPTAP
∞MORE IN MOTION
Things You Can Download
Apps that live on your devices.
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App Store→
02iOS · Photo & video
FanFrame
Browse video frame by frame, export full-resolution stills and turn selected moments into Live Photos.
View case study ↗03iOS · Korean typing
Typeflow
Practice Korean typing with graded vocabulary, TOPIK texts and web articles, with live speed and accuracy feedback.
View case study ↗04iOS · Korean reading
韩读
Read Korean PDFs, EPUBs and web pages with tap-to-lookup, AI translation and grammar analysis.
View case study ↗05iOS · Education
课迹
A classroom recorder that keeps audio, timestamped markers, courses and written notes together.
View case study ↗06iOS · Counter & habits
轻计数
Count everyday activities, complete daily check-ins, and record progress quickly through widgets or Back Tap.
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Things You Can Visit
Websites, tools, and digital spaces.
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07WEB · Prompt generator
ASKGUA
A structured prompt generator for four traditional Chinese divination systems, designed to clarify complex inputs.
View case study ↗08WEB · Interactive experiment
FINGERTYPE
A multilingual hand-tracking experiment where 42 landmarks trigger sound, freeze-frames and animated scenes.
View case study ↗09WEB · Korean typing
TYPEFLOW WEB
Practice with 26,452 graded words, TOPIK readings and essays, or import Korean web articles directly in the browser.
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Things You Can Play
Small games made for a quick pause.
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10GAME · Simulation
超市模拟经营
Grow a street-corner shop by balancing 216 products, pricing, restocking, checkout and staffing decisions.
View case study ↗11GAME · Puzzle
水獭泡泡澡
Dig paths and sequence water flow across 50 mechanism puzzles to fill a little otter's bath.
View case study ↗12GAME · Logic experiment
教坏一只小机器人
Teach a tiny robot through keep-or-remove examples, then watch it infer the rule—correctly or delightfully wrong.
View case study ↗13GAME · Logic puzzle
水果数独
Place every fruit in exactly the right spot across 126 unique puzzles, from compact 4×4 boards to 12×12 challenges.
View case study ↗14GAME · Physics puzzle
只动一件
Move a single ramp and guide the ball through wind, springs and portals until it lands in the cup.
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PROFILE
Make it real→Make it better
Interest starts it. Finishing defines it.
I focus on language learning, imagery and interaction, and I use development to validate my ideas. Each project here started from a specific need and became a product that real users can visit or download. Even a very specific need can find its audience. For me, development begins by noticing needs that have not yet been answered well.
- 01Find a problem through curiosity↓
- 02Define features and user journeys↓
- 03Design and develop independently↓
- 04Ship, observe and iterate●