Screen Pixel Ruler and Loupe

Screen Pixel Ruler and Loupe is an independent open-source Linux visual
measurement suite for UI designers, developers, and engineers, providing an
alternative to desktop design measurement tools like PicPick. Not affiliated
with, sponsored by, or endorsed by any third-party software vendor.

FEATURES
- Floating On-Screen Pixel Ruler: Always-on-Top translucent X11 horizontal,
vertical, and dual-axis caliper ruler with mouse-wheel opacity, drag and
arrow-key pixel nudging, interactive Pin A/B hypotenuse readout, and unit
conversion across px, mm, cm, in, and CSS rem calibrated by RandR/QScreen
physical monitor DPI.
- 3-Point Screen Angle Protractor & Canvas: interactive transparent 360-degree
on-screen protractor and measurement canvas to compute exact vertex angles,
supplementary angles, arm lengths, slope percentages, and bounding-box
aspect ratios over live desktop snapshots or loaded images.
- 10x Live Cursor Loupe & Measurement Log: real-time 4x-16x cursor pixel grid
magnifier with RGB, HEX, HSL, and CMYK readouts, clipboard copy shortcuts,
and persistent SQLite/JSON measurement history with UTF-8 CSV export.
- Bilingual Interface: defaults to English with an instant Vietnamese toggle.

SUPPORT & DONATE
- Created by Thanh Nguyen — https://buymeacoffee.com/thanhnv128b