REPLOCK
Home & business security, made clear — locks and deadbolts, smart locks and keypads, cameras and alarms, and the tools to secure what matters.
From choosing a deadbolt grade and sizing a smart lock to planning camera coverage, setting up an alarm, picking a safe, and mapping who gets access, RepLock pairs free hands-on security tools with practical guides and a richly illustrated museum. Secure your home and business with confidence.
Home & Business Security Tools & Calculators
Free, hands-on tools to help you plan and improve your security — from locks and deadbolts to smart locks and keypads, cameras and CCTV, alarms, safes, and access control.
Keypad Combination Calculator
See how many codes a keypad lock or PIN pad can hold, and how long a brute-force attacker would need — with code length, keypad size, no-repeat rules, and lockout all in play
Security Camera Storage Calculator
Size the NVR/DVR drive your CCTV system needs from resolution, frame rate, recording hours, retention days, and camera count — in GB and TB, with a suggested drive size
Password Entropy Calculator
Measure a password's strength in bits of entropy from its length and character sets, and estimate how long an offline attacker would take to crack it at a chosen guessing speed
Camera Lens Coverage Calculator
Work out a security camera's horizontal field of view and how wide a scene it captures at a given distance, from its focal length and sensor size — real optics, no guesswork
Lock Grade Guide (ANSI/BHMA)
Compare ANSI/BHMA Grade 1, 2, and 3 for deadbolts and locksets on the exact cycle counts, forced-entry strikes, and strength each must pass — and which grade fits your door
Safe Rating Guide (UL Fire & Burglary)
Decode UL fire ratings (Class 350, 150, 125) and burglary ratings (RSC, TL-15, TL-30, TL-30x6) and filter them by whether you need fire protection, burglary protection, or both
Museum of Locks & Security
Wander an immersive museum of locks and security — the keys, padlocks, and deadbolts that guarded homes through the ages alongside the vaults, safes, and strongrooms of banks and businesses, and the alarms, cameras, and access systems that protect us today, each in its own gallery, so you can get to know the stories behind how we keep things safe: where each idea came from, what makes it matter, and the role it plays in security today.
Tour the museum →Lock Grade & Safe Rating Reference
Every ANSI/BHMA door-lock grade and every UL fire and burglary safe rating, straight from the published standards, on one page.
See the full reference →From the Journal
Fresh guides on locks and deadbolts, smart locks and keypads, cameras and CCTV, alarms and monitoring, safes, and access control, plus practical tips for hardening your doors and windows and securing both home and business.
The 12-Point Home Security Checklist to Run Before You Travel
A house that's obviously empty for two weeks is a different risk profile than one occupied daily. Twelve concrete things to check before you leave, from lock grade to camera retention to old keypad codes.
Can Smart Locks Be Hacked? Separating Real Risk From Hype
Yes, in specific, mostly-preventable ways — and no, not by the dramatic "hacker unlocks your door from across the world" scenario most headlines imply. What's actually at risk, and how to close it.
Deadbolt Won't Turn or Budge? Common Lock Problems and When They Mean "Replace It"
Most stuck deadbolts are a misaligned strike plate, not a broken lock. Here's how to diagnose the actual cause before assuming replacement is necessary — and the few cases where it genuinely is.
Master Key Systems Explained: Keyed Alike vs. Keyed Different
One key that opens every unit, versus one key per unit plus a master that opens all of them — the difference matters for landlords and property managers, and it's set at the pin level, not the key.
How Many Security Cameras Does a Small Business Actually Need? Coverage Planning Basics
Not "as many as the budget allows" — coverage planning starts from entry points and cash-handling areas, then fills gaps. A worked example for a small retail storefront, plus the storage cost of getting it right.
NVR vs. Cloud Storage for Security Cameras: Cost and Reliability Compared
A local NVR is a one-time storage cost with no recurring bill; cloud storage is a subscription that keeps footage safe even if the camera itself is stolen. Neither is universally right — here's the actual trade-off.
Keep Learning
Practical know-how on locks, alarms, and cameras, plain-language explainers on lock grades, key systems, and how home security works, and seasoned tips for renters and property owners alike — everything you need to dig deeper and secure your space with confidence.
Visit the Learn hub →