Linear vs Tactile: What the Force Curve Really Says

Two descriptions of the same switch can sound like they are describing different products. One person calls a switch smooth and predictable, another calls the same switch vague and unsatisfying. Both are reading the same force curve, and the disagreement comes from which part of the stroke each person pays attention to.

Force curves explain the argument better than words do, because they plot resistance against travel and show the whole stroke at once. Reading one tells you where the switch is smooth, where it resists, and where it firms up, which is exactly what the hand feels and what a name cannot convey.

What does a linear curve look like?

A linear switch rises steadily from the top of the stroke to the bottom, with no deliberate feature in between. The resistance increases because the spring compresses, which is a smooth and predictable progression. Nothing tells you where the key registers except the travel distance itself.

That predictability is what people mean by smooth. The hand encounters exactly what it expects at every point, and there is no moment where the required force changes unexpectedly. For fast repeated presses this is a genuine advantage.

And a tactile curve?

A tactile curve has a deliberate bump: the resistance rises faster than the spring alone would require, then drops back before continuing. That drop is the tactile event, and it happens shortly before the key registers. The hand feels a small release that signals the press is about to count.

The size and position of that bump matter more than its presence. A large bump high in the stroke feels completely different from a small one near the actuation point, and both are called tactile. The name hides more variation than it reveals.

Where does the bump sit relative to actuation?

This is the most useful thing a curve tells you. On a well-designed tactile switch the bump sits just before the actuation point, so the release coincides with the key registering. On a poorly matched one the bump sits after actuation, so the feedback arrives too late to be useful.

We measured switches where the bump and the actuation point were separated enough that testers reported the feedback as disconnected from the press. Those are the switches that generate the most disagreement, because the signal the hand receives does not match what the key did.

Why do people disagree about the same switch?

Because they bottom out differently. Someone who presses all the way through feels the end of the stroke and the bottom-out, and for them the bump is a small detail. Someone who presses just past actuation feels mostly the bump, and for them it is the entire experience.

Typing style also changes the speed of the press, and speed changes how a bump feels. A slow press lets you feel the shape of the resistance, while a fast press passes through it too quickly to resolve. The same switch genuinely feels different at different speeds.

What does the bottom of the curve tell you?

More than most people expect. A curve that rises steeply at the end produces a hard bottom-out that becomes tiring over a long session, while one that flattens produces a softer landing. This part of the stroke is where fatigue comes from, and it is invisible in a switch name.

Spring choice drives this region. Two switches with the same rated weight can have very different end-of-stroke behaviour, which is why a switch that feels fine for ten minutes can feel harsh after an hour.

How does the housing change the curve?

The housing adds friction, and friction adds noise to the curve rather than changing its shape. A tight housing produces a slightly higher measured force with small irregularities, and the hand reads those as grit. A loose housing produces wobble, which reads as imprecision.

Neither shows up in a specification, and both are within manufacturing tolerance rather than design. That is the main reason two samples of the same switch can measure differently and feel different, and it is worth knowing before you buy in bulk.

Does lubrication change the curve?

It reduces the friction component, which lowers the measured force slightly and removes the small irregularities. It does not change the shape of the curve, so a tactile switch stays tactile after lubrication and a linear one stays linear. What changes is the cleanliness of the stroke.

That is why lubrication is most noticeable on switches that were gritty to begin with. A switch that already had a clean stroke gains very little, which explains why the same treatment produces wildly different reports from different people.

Can you read a curve without special equipment?

Partly, by pressing slowly and paying attention to where the resistance changes. A slow deliberate press reveals the bump and the bottom-out, which are the two features that matter most. It is subjective but it is far more informative than reading a name.

Comparing two switches back to back at the same slow speed makes the differences obvious. Doing it a week apart does not, which is why side-by-side testing is worth the effort when you are choosing.

Which curve suits which work?

Linear suits fast repeated presses and anything where you bottom out routinely, because there is no feature to pass through. Tactile suits typing where you want confirmation without bottoming out, because the bump tells you the press counted.

Neither is better, and preference here is genuinely individual. The useful thing is knowing which feature of the curve you are responding to, because that lets you predict how a different switch will feel without trying it.

What should you look at besides the curve?

Travel distance and actuation height, because they determine how much movement a press requires. A shorter travel with the same curve feels faster even though the force is identical, and that is often the difference people misattribute to the switch type.

Then look at consistency across samples. A switch whose curve varies less from unit to unit will feel more predictable across a whole keyboard, and that matters more than the shape of any single curve.

Where does this lead next?

Does switch speed matter for the curve?

Not for its shape, but it does change how the curve feels. A faster press passes through the features more quickly, so a bump that is obvious when pressed slowly can nearly vanish at speed. That is why the same switch feels different to fast and slow typists.

It also changes where the hand is when the key registers. A fast press often bottoms out before the feedback is fully processed, which removes the advantage a tactile bump is supposed to provide.

What about the return stroke?

Almost nobody discusses it, and it matters for repeated presses. A switch that returns slowly limits how fast a key can be pressed again, and that shows up as missed repeats rather than as a feel. The curve on the way up is as real as the one on the way down.

Measuring both directions gives a complete picture, and the difference between a switch that returns promptly and one that does not is obvious in fast repeated typing.

Does actuation height matter as much as the curve?

For speed, arguably more. A switch that registers early in the stroke lets you release sooner and press again sooner, and that affects how fast you can type independently of how the switch feels.

Comparing two switches with the same curve but different actuation heights makes this obvious. The one registering earlier feels faster even though the force is identical throughout.

How does travel length change the experience?

Shorter travel reduces the distance per press, which reduces the work and the time. It also reduces the room available for a tactile feature, which is why short-travel switches tend to be linear.

That relationship explains a lot of the market. Tactile designs need travel to place a bump, and short-travel designs do not have it, so the two properties tend to travel together.

Does switch age change the curve?

Gradually, mostly through friction rather than through the spring. The shape stays similar and the fine structure gets rougher as surfaces wear, which reads as a loss of smoothness rather than a change in weight.

That is why an old switch can feel gritty while still measuring the same overall force. The curve hides it, and the hand does not.

Is one type better for learning to type on?

Preference dominates, and the more useful factor is consistency. A keyboard where every key feels the same teaches position more reliably than one where the feedback varies across the board, regardless of which curve it uses.

Anyone switching types should expect a short adjustment period. The hand adapts quickly, and judging a new curve within the first hour is usually premature.

Once the curve is understood, the next variable is what the keycap and the plate do to it, because both change how the curve reaches your fingertip. Measuring the same switch on two plates is the natural continuation, and it usually surprises people how much of the feel is not in the switch.