Dreami
closed testingA simple sleep log for Android. Log your sleep sessions, see weekly and yearly patterns, and get bedtime suggestions.
- One-time $4.99 unlock
- No subscription, no free-trial tricks, no account
// a one-person studio in Orange County, California
Small, honest apps. Careful testing.
KHY Labs is where I, Kwang Hyun Yoon, build calm, private Android apps and test other people's software by hand. No accounts to create, no dark patterns, and bug reports that developers can actually act on.
PASS Screen reader announces every button
WARN Focus jumps after the modal closes
FAIL Checkout total ignores the discount code
Apps
Each app keeps your data on your device. They're in closed testing on Google Play right now, so if you'd like early access, get in touch.
Clarity in Calm
closed testingA free wellness companion with daily check-ins, an encrypted journal, breathing exercises, and grounding tools.
- Free, with no ads
- Journal encrypted on your phone
- English, Korean, Spanish, and Hindi
Invoicer
closed testingInvoices and receipts for freelancers, made on your phone and shared as clean PDFs.
- Pay once, no subscription
- Works offline, no account needed
Manual QA testing
I test web and mobile apps the way real people use them, and I write reports from a developer's point of view, because I build apps too.
- ✓Top Rated on Upwork with a 100% Job Success Score.
- ✓Accessibility testing from a real assistive-technology user. I use screen readers and screen magnification myself, so I find what automated checkers miss.
- ✓Developer-aware bug reports. Clear steps, expected vs. actual results, and evidence, so fixes go fast.
- ✓Functional, cross-browser, and mobile testing on Android and the web.
How I work
- Walk the whole flow first to get a baseline, then run the planned test cases.
- Reproduce every bug 5 to 10 times before reporting it.
- Log issues as I find them, not in one batch at the end.
- Report with repro steps, evidence, and impact, so you know what to fix first.
About
I'm Kwang Hyun Yoon, a self-taught developer and freelance QA tester based in Lake Forest, California. I build with React Native, Expo, TypeScript, and Cloudflare.
KHY Labs runs on a few simple values: be honest about what an app does and costs, think of the people who will use it, including people who rely on assistive technology, and tread lightly by building small, efficient tools that don't collect more than they need.
Contact
Have an app that needs testing, or want early access to one of mine? Reach out.