Bui Trong Khanh Duy / Ho Chi Minh City

Khanh Duy

Builds small apps for everyday friction.

A Ho Chi Minh City developer behind LofiHood, SpotterFuel, CampusCue, WakeArc, and CafeSignal: focused tools for Mac playback, crowded gyms, school-notice follow-through, sleep-cycle alarms, and public Wi-Fi.

Portrait of Khanh Duy

Five focused products, each built around one specific interruption.

Calm playback, crowded-gym reroutes, parent review flows, and sleep-cycle alarms, plus public Wi-Fi handoff: each app starts with a real moment where the next action should be simpler.

Real app icons, screenshots, and interface previews from the product workspaces.

LofiHood app icon

LofiHood

Mac

Offline lofi for your Mac menu bar, with mood presets, local albums, imports, shortcuts, and a sleep timer.

Macmenu baroffline
Visit LofiHood
SpotterFuel app icon

SpotterFuel

iPhone

An iPhone gym companion that finds same-muscle swaps when planned equipment is busy.

iPhonesame-muscle swapsApp Store
Get SpotterFuel
CampusCue app icon

CampusCue

iPhone

School flyers, PDFs, and screenshots become reviewable parent action cards before Calendar or Reminders.

iPhonereview firstlocal-first v1
View CampusCue
WakeArc app icon

WakeArc

iPhone + Apple Watch

A calm sleep-cycle alarm planner that works around 90-minute cycles, Sleep Now, Wake At, and Apple Watch sync.

AppleWatchsleep cycles90-minute cycles
View WakeArc
CafeSignal app icon

CafeSignal

Mac

A native macOS menu bar app that finds usable open public Wi-Fi, verifies internet access, and helps with simple captive portals when safe.

Macpublic Wi-Fimenu bar
Visit CafeSignal