Your CS2 settings

sensitivity mouse DPI cm / 360°

Type either sensitivity or cm/360 – the other follows. Rotation is sensitivity × m_yaw(0.022)° per mouse count, identical to CS2 (m_pitch is also 0.022). Resolution does not change sensitivity in CS2, and does not here.

Mouse input

Raw / unadjusted input (recommended – same as CS2 m_rawinput 1) Refuse to start if raw input is unavailable (no silent fallback) Low-latency pointerrawupdate events (experimental) Invert Y count scale

Count scale multiplies every mouse delta. Keep it at 1 unless the Verify / calibrate tab shows your browser reports scaled movement (it can when the Windows or browser zoom is not 100%).

Render

Resolution 1440 × 1080 (4:3) 1280 × 960 (4:3) 1024 × 768 (4:3) 1920 × 1440 (4:3) Native window aspect (Hor+, wide) Stretch to fill the screen (like CS2 “stretched” in fullscreen) Go fullscreen when a run starts Anti-aliasing (MSAA; costs GPU time – reload to apply) Low-latency canvas (reload to apply; untick if you see tearing)

4:3 renders with an exact 90° horizontal / 73.74° vertical FOV (CS2’s reference). The picture is then stretched to your monitor exactly like CS2’s stretched 4:3, so targets look wide and move across the screen at the same speed per mouse count. For a faithful match use fullscreen (F11 or the checkbox) on the same monitor you play CS2 on.

Volume Show FPS / frame time Strafe mode: show live spread circle

Crosshair

Length Thickness Gap Colour Outline Centre dot

1 · Prove 1:1 against CS2

1. Set the same sensitivity & DPI in CS2 and here. Windows pointer speed 6/11 and “Enhance pointer precision” off; CS2 m_rawinput 1.
2. In CS2 read your view angles with cl_showpos 1 (or the getpos console command, which prints setang pitch yaw 0), then drag the mouse a fixed distance along a ruler (e.g. one full 360° turn = – cm).
3. Open Sens lab here, press Z, and move the mouse the same distance. The yaw readout must show the same degrees as CS2 (360° for one full turn). The counter shows raw counts: 360° = – counts.

Open Sens lab Run built-in self-test Run performance test

2 · Check the browser isn’t scaling movement

Ruler distance (cm)

Tape a ruler to your mousepad, place the mouse at 0, press Measure, drag straight right the full distance, press Space.

Measure