Dome Lab
Unreal Keyboards · Dome Lab
Measure.
Compare.Understand.
A public measurement system for Topre and compatible electrocapacitive domes: inspect force curves, build evidence-aware assemblies, and read the research behind the measurements.
fc-3.4 metrics-v4.2
68-dome fleet
Public outputs
Three ways into the evidence.
Each output has its own version and purpose. The Force Curve Bench compares measurements, the Parts Builder assembles compatibility evidence, and the preprint documents the method and exploratory perception study.
Published · fc-3.4
Force Curve Bench
Inspect individual force curves, compare dome families, view Weight and Tactility percentiles, and keep detected force-wall onset separate from the perception indices.
Published · lib-6.0
EC Parts Builder
Build a Topre-compatible assembly from documented parts and see whether each relationship is verified, known not to work, or still unverified.
Published · 29 Aug 2026
Beyond Snap Ratio
Preprint 2.0 presents the force-travel method, frozen evidence, completed one-rater pilot, robustness analysis, percentile indices, and limits of the current claims.
Plain-language indices
Fleet position, not a universal score.
The indices are simple percentile coordinates inside the released 68-dome reference fleet. They make relative comparison easier without claiming that one number captures the complete feel of a keyboard.
Weight Index
Collapse force percentile
Where the dome's measured collapse force falls in the released fleet, from the lightest fleet endpoint to the heaviest.
Tactility Index
Force-drop percentile
Where the dome's measured force drop falls in the same fleet, from the least-sharp fleet endpoint to the sharpest.
Important: percentile scales are rankings, not ratio scales. An index of 80 is not “twice” an index of 40. Detected force-wall onset remains a separate measured-assembly proxy and is not part of either index.
How to use the Lab
Start with the question.
Use the Bench to compare measured behavior, the Parts Builder to reason about an assembly, and the paper when you need the full definitions, evidence boundaries, or reproducibility record.
Open data & analysis compendium“Which dome feels heavier?”
Begin with Collapse Force and Weight Index. Use Ramp and pre-collapse work to inspect the supporting shape around that peak.
“Which collapse feels sharper?”
Begin with force Drop and Tactility Index. Then inspect steepest 0.10 mm drop, Drop Rate, and Snap % for complementary descriptions of the descent.
“Will these parts work together?”
Use the EC Parts Builder. Treat Verified, Does not work, and Not verified as different evidence states—not as interchangeable recommendations.
“How strong is the perception evidence?”
The current associations are exploratory, single-rater, post-hoc, and in-sample. They do not establish causation, population validity, inter-rater validity, or prediction for unseen users and assemblies.