jackie zhong

jackie zhong

Building a social app
#53388181 follower1 following
#4,553Last month
7 KP
>10,000All time
8 KP

About

Maker of CalcDelta — free calculators with clear formulas and worked examples.

Badges

Tastemaker
Tastemaker
Gone streaking
Gone streaking
Gone streaking 5
Gone streaking 5

Maker History

  • CalcDelta
    CalcDeltaFree calculators with clear formulas and worked examples
    Oct 2026
  • StampCam Watermark Camera
    StampCam Watermark CameraAdd time and GPS watermarks to photos and videos
    Oct 2026
    • 🎉
    Joined Product HuntMarch 24th, 2023

Forums

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15d ago

Hood Warfare Wiki - Independent guides for Hood Warfare 2 on PC

An independent, editor-maintained wiki for Hood Warfare 2. Learn the six modes before you queue, check weapons and unlocks, follow patch-linked changes, and troubleshoot PC launch issues—with official facts, community reports, and advice kept clearly labeled. Unofficial fan project; not affiliated with Trapstar Games or Valve.
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1mo ago

Hi Product Hunt! I build everyday tools with a focus on privacy and clarity

Hi everyone I m the maker of StampCam and CalcDelta.

StampCam started with something I noticed in both work and everyday life: people taking photos for attendance check-ins, construction-site records, or personal memories wanted an easier way to keep the time, place, and notes in the picture.

When I explored existing watermark camera apps, I felt privacy deserved more attention. That shaped StampCam, a camera app for iPhone and Android where capture, watermark rendering, and saving happen on the device.

I m also building CalcDelta, a free calculator website. Its focus is making results easier to understand and check, with formulas, worked examples, and explanations. Whether you re comparing compound interest scenarios or planning a running pace, you can see how the answer was calculated. No account required.

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1mo ago

StampCam Watermark Camera - Add time and GPS watermarks to photos and videos

StampCam adds timestamps, addresses, GPS coordinates and notes to photos and videos on iPhone and Android. Keep site visits, inspections and travel logs in context. Capture, watermark rendering and saving work on your device, including offline. Optional weather and elevation lookups need an internet connection.
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