INPUTPROOF
VIEW
Open lab
SYSTEM READYENGINE PLATFORM-V1SUITES 07 / 37 ENTRIESPROCESSING ON DEVICERAW UPLOAD 0 BOUTPUT JSON / SCORECARD / PRINT
Device lab/Keyboard
KEYBOARD TEST

Test your keyboard.

Press keys and see what registers. Check stuck keys, repeats and key combinations.

NO INSTALLLIVE FEEDBACKLOCAL ONLY
STARTPress keys
WATCHWorking keys light up
ACCESSPage focus
DATALocal only
1Press keys
2Working keys light up
3Check repeats or chatter
KEY EVENT MATRIX

Press combinations. See every transition.

CLICK TO START0/102 TESTED · 0%
LAYOUT VIEW
GUIDED NKRO COMBINATION0/6 CONCURRENT0% ALL-CHALLENGE COVERAGE
KeyWKeyAKeySKeyDShiftLeftSpace

Hold the complete combination together. Missing browser events are evidence for retesting, not automatic proof of electrical ghosting.

CONTROLLED KEY REPEAT / HOLD ONE KEYNOT RUN
INITIAL DELAY —MEDIAN INTERVAL —RATE —P95 JITTER —CONFIDENCE —

This measures operating-system and browser repeat behavior. It is not keyboard scan rate or physical input latency.

TOTAL EVENTS0
HELD NOW0
MAX CONCURRENT0
REPEAT EVENTS0
TESTED KEYS0 / 102
COVERAGE0%
CHATTER FLAGS0
PER-KEY CHATTER FLAGS

No same-key transitions under 50 ms observed.

TIMEACTIONCODEKEY / LOCATIONFLAGS
Event evidence will appear here.
DIAGNOSTIC ACTION ENGINECOMPLETE THE PROTOCOL

Focus the matrix and press the keys you want to verify

No browser keyboard transition has been captured.

1 FINDING(S)1 ACTION(S)RULES / EVIDENCE-BOUND
01
INFO

Focus the matrix and press the keys you want to verify

No browser keyboard transition has been captured.

LIKELY CAUSES
  • The test surface is not focused or no key was pressed.
ACTIONS
  1. Click the matrix and press each target key once.
RETEST CONDITION

A DOWN and UP transition should appear in the event timeline.

Actions are generated from visible Evidence fields and versioned product rules. They do not identify a physical root cause with laboratory certainty.

LOCAL BASELINE HISTORY / OPT-IN

Compare repeat tests without an account.

0 / 20 SAVED · 90 DAY RETENTION
Device report

Complete this protocol before saving a baseline.

KEYBOARD REPEATABILITY / LAST 5NEEDS MORE RUNS
0/5 RECENT COMPATIBLE RUNS

Save 3 more compatible run(s).

Key coverage— %NEEDS 3 VALUESSTABLE ≤8 pp · REVIEW ≤18 ppNEEDS MORE RUNS
Max concurrent— keysNEEDS 3 VALUESSTABLE ≤2 keys · REVIEW ≤4 keysNEEDS MORE RUNS
Chatter flags—NEEDS 3 VALUESSTABLE ≤0 · REVIEW ≤2NEEDS MORE RUNS
0 incompatible/incomplete and 0 older compatible run(s) excluded. Different tested key sets can change coverage even when the keyboard is unchanged.
No raw axes, key logs, audio, video, images, full user agent or device ID is stored. Clearing browser site data also removes this history.
API Keyboard EventsPROCESSING BROWSER LOCALSCHEMA inputproof-evidence-v1RAW UPLOAD 0 B
OPTIONAL TIPSImprove repeat checks0/3 checked

Optional. The test works without this; these tips only reduce comparison noise.

MEASUREMENT BOUNDARY

Useful evidence, without pretending to be a laboratory.

01

The browser or operating system can reserve shortcuts before the page receives them.

02

Key combinations are browser-delivered events, not an electrical certification.

03

Very fast tapping can look like chatter.

04

Layout changes affect key labels.