Observed arrival · 2026-10-13
Masterkeying: a master-key system designer
A browser-based tool for laying out master-key systems, checking key-to-door combinations, and planning the replacement of a missing key.
○Open
⊠Login
$Paid
†Ads
✦Pretty
●Pro
◎Niche
◉Human
⚑Risk
ƒJS
- For
- Locksmiths designing and maintaining master-key systems
- Worth noticing
- The designer enforces MACS 7, limits master pins to 2–8, and allows no more than three master pins in a chamber.
Field notes
The browser designer turns key-to-door selections into an inferred hierarchy and a progression chart with pin stacks for each door. Its stated limit is 16 doors, eight shared keys plus an own key per door, and three levels beneath the top key. For missing-key replacement, the page describes using a retired-bitting list and a ghost bitting; it says the separate app keeps projects and a cutting register.
Observed signals
Read the marks
Editorial observations of this landing page, not a rating.
○OpenPublic substance visible
✦PrettyNotable craft visible
●ProPolished or operationally mature
◎NicheUnusually specific use
One card from the complete issue