Short version: the curves on this site are modelled, not measured on a lab rig. They're built from the numbers manufacturers publish, shaped by how each kind of switch is known to behave. They're good for comparing shapes; for exact numbers, trust a physical measurement.
Inputs
For each switch we take the published actuation force, bottom-out force, pre-travel and total travel, and the tactile peak where one is listed. Where sources disagree, we use the manufacturer's own sheet.
The model
- Spring: a straight line through the actuation and bottom-out forces, with a short preload ramp at the start.
- Bump: for tactiles, a smooth rise to the listed peak and a gentler fall; for clickies, a sharp collapse after the peak.
- Bottom-out: a steep wall over the last 0.18 mm.
- Release: the press curve minus a type-dependent friction gap, with a smaller, shifted bump.
- Texture: a little seeded noise, so the lines look like the real thing rather than a textbook drawing.
Everything is computed at 0.01 mm steps. Each switch page has the raw numbers as a CSV.
Sound
The short clips on switch pages are synthesised from the switch type and housing material. Supporters get lossless recordings in the library.
Corrections
If a manufacturer updates a spec, or you spot a mistake, the supporters' area has a corrections form.