Bumper Test

Quick start

1. 1
   Connect your controller. Plug it in over USB, or pair it over Bluetooth in your device settings first.
2. 2
   Press any button first. Browsers will not notice a controller until they see its first input.
3. 3
   Tap each bumper a few times at a normal pace. The counters and timing readout below update with every press and release.
4. 4
   Try a fast double tap on each side. This is the quickest way to catch a bumper that occasionally fails to register a second press.

Test your bumpers

What makes bumpers different to test

Unlike triggers, which are analog and report a smooth range of pull depth, bumpers are simple digital switches under the hood, they are either pressed or they are not, with no in between value to inspect. That means the usual approach of watching a resting value for drift does not apply here at all, since there is no meaningful resting reading beyond zero and one. What actually fails on a worn or damaged bumper is different in character: a press that does not register at all, a press that registers but the switch sticks and does not cleanly release, or a fast repeated press where the second tap gets lost because the switch has not fully reset in time.

This test is built around that failure pattern specifically, tracking how reliably each individual press both starts and ends cleanly, rather than measuring a value that bumpers do not really have.

How to read your results

Presses and the live pad

The pad fills solid the instant a press is detected and clears the instant it releases, with the press counter ticking up by one for each completed press. Watch the pad directly while pressing at different speeds, a bumper that visually lags behind your own finger, filling a noticeable beat after you actually pressed, is worth paying closer attention to even if the counter still increments correctly.

Last hold

This is how long your most recent press lasted from the moment it registered to the moment it released. There is no universally correct hold time since that depends entirely on how you are pressing, but watch for holds that read unexpectedly long on what felt like a quick tap, which can indicate the switch is sticking slightly before releasing rather than snapping back cleanly.

Fastest gap

This tracks the shortest time between the end of one press and the start of the next, across all your presses this session. A smaller number here generally means the bumper is keeping up well with rapid input. If this number seems to have a floor that never goes below a certain point no matter how fast you physically tap, that floor may be the switch's actual mechanical reset limit rather than a limit on your own tapping speed.

Missed taps

This counts presses that appear to have been attempted, based on timing and rhythm, but where the controller never reported a press event at all. This number is inherently an estimate, since a tap that produces nothing is by definition invisible to the controller, but a missed tap count that climbs noticeably during fast repeated presses is a meaningful warning sign worth taking seriously.

Double tap challenge

This isolates your single best attempt at two fast, clean presses in a row, with a genuine release in between rather than one long press being misread as two. A healthy bumper should comfortably manage a double tap somewhere under 150 to 200 milliseconds. If your best result sits well above that no matter how many attempts you make, and you are confident the slow result is not just your own finger speed, that points toward the bumper struggling with rapid reset.

The press timeline

This gives you a visual rhythm strip of exactly when each bumper fired over the last ten seconds. Press at a steady, even pace and look at the spacing between marks. Evenly spaced marks that match the rhythm you were actually pressing in indicate healthy, consistent registration. Marks that cluster unevenly, with some gaps far larger or smaller than your own pressing rhythm would explain, suggest the bumper is not responding consistently to identical input.

Why bumper reliability matters more than it seems

Bumpers carry a disproportionate amount of responsibility in a lot of genres relative to how little attention they usually get. Racing games map gear shifting directly to L1 and R1, where a single missed shift at the wrong moment can cost a race. Shooters frequently bind grenade throws, melee, or tactical sprint to a bumper, actions that matter most in exactly the high pressure moments where a missed input is most costly. Fighting games and platformers often use bumpers for blocking or dashing, where timing reliability is the entire point of the input existing at all.

Because bumpers are simple switches rather than the more closely watched analog sticks or triggers, a developing fault often goes unnoticed for longer, since there is no obvious drift or visible imprecision to catch your eye, it just quietly starts dropping the occasional press until it becomes a pattern you can no longer ignore in game.

Connecting by device

Windows and Mac

Plug in over USB, or pair over Bluetooth in your system settings first. Chrome, Edge, and Firefox all support the controller out of the box once it is paired.

Android phone and tablet

Pair the controller in your device's Bluetooth settings, then open this page in Chrome. Other Android browsers vary in their support.

iPhone and iPad

Pair an MFi or Bluetooth controller in Settings, then open this page in Safari. iOS has supported the same Gamepad API since version 14.5.

Linux

Plug in over USB or pair over Bluetooth, then use Chrome or Firefox. Some distributions need a one time udev rule for certain Bluetooth controllers to be recognised by the operating system at all. If the controller is not visible at the system level, it will not be visible here either.

Troubleshooting

The pad sometimes does not light up even though I definitely pressed

Try pressing in a slightly different spot along the bumper's length, since some bumpers respond less reliably near one edge than the centre, particularly once worn. If the missed taps counter climbs specifically during fast repeated presses but rarely during slow deliberate ones, that points toward a reset speed issue rather than a dead switch.

The pad lights up but takes a moment to clear after I release

Watch the last hold reading on a press you know was short and quick. If it reads noticeably longer than the press actually felt, the switch may be sticking slightly on release rather than snapping back immediately, which is worth keeping an eye on even if it has not caused an obvious problem in game yet.

My double tap result seems slow no matter how fast I try

Compare it against the other bumper using the exact same tapping motion and speed. If one side consistently and clearly underperforms the other despite identical effort, that is a more reliable signal of an actual hardware difference than the absolute number alone.

Nothing happens when I connect a controller

Press a button first. Many browsers will not register a controller until they see its first input.