AI products · HCI research · Web

I build AI products that help people speak, learn and connect.

I'm Ray Tsai, in the AI master's program at NTU CSIE (HCI Lab). I started in speech-recognition research, shipped an AI speaking-practice app on my own, and build websites for communities and programs.

See my apps Get in touch

Ray Tsai giving a thumbs-up in front of the Google sign and colorful lobby wall — NTU CSIE · HCI Lab

From speech research to shipped products

Education

National Taiwan University

Dept. of Computer Science & Information Engineering — AI master's program, HCI Lab

Research

2025/6 – 2026/3

CKIP Lab, Institute of Information Science, Academia Sinica

Part-time research assistant

Speech recognition challenge

2^nd

Track 1 — 2nd place

3^rd

Track 2 — 3rd place

Formosa Speech Recognition Challenge 2025

Team entry (student division); the team's paper was published at ROCLING 2025.

Summer 2026

≈7weeks

NTU Silicon Valley exploration program

About seven weeks in Silicon Valley doing market research and expert interviews, followed by the Demo Day on Sep 12.

Read the seven-week recap

Film · YouTube · 10:36

I turned my seven weeks into a film

Seven Weeks in Silicon Valley | Growing Into My Own Voice

YouTube video cover: 7 Weeks in Silicon Valley

Play video · 10:36

YouTube loads only after you press play.

Watch on YouTube

Turning research and curiosity

into tools people use daily

A shipped app, and products in progress

Live on the App Store

Mirror – AI Speech Coach

An AI speech coach: record your spoken answer, and Mirror transcribes, scores and rewrites it for clarity and structure — then plays the better version back in your own cloned voice.

Voice signature in 30 seconds
Mock interviews in English, Chinese, Japanese
Side-by-side replay of original vs. improved
Five-axis voice radar

Built solo · iPhone · Free

View on the App Store

More projects

Open a project to see its screens, status and links.

Echo iOS · Chrome

Echo product page and a lock-screen practice prompt

A podcast player that remembers every 15-second rewind: it keeps the sentence you replayed, diagnoses why you missed it (vocabulary, linking, speed…), and turns it into tomorrow's speaking practice. The Chrome version does the same with YouTube captions.

iOS: invite-only TestFlight beta
Chrome extension: in development

Product page GitHub

Rayality Projection Mapping Web · Open source

Rayality editor corner-pinning and projector output

Projection mapping in the browser: import images or video, drag four corners to correct perspective, and send the output to a projector from a separate window. No API key needed for the core workflow; optional Google Veo generation with your own key.

Live · open source

Open the editor GitHub

MedBuddy Web · LINE bot

MedBuddy caregiver dashboard (demo data)

A prototype for medication understanding and care handoffs for older adults on many medicines: rule-based checks, and two LINE accounts sharing one care record between elder and caregiver. Medication-bag photo readings must be confirmed by a person before they are saved. Built in about 48 hours during a build challenge.