Short answer
Keys need no power but leave no record and cannot be revoked without rekeying. Keypads add codes that can be changed and tied to users. Cards, fobs and mobile credentials log every entry and can be revoked without touching the lock, at the cost of hardware and administration. Most small businesses end up mixing them door by door.
In this article
What is the difference between keys, keypads and cards or mobile credentials?
A key opens a lock mechanically and leaves no record. A keypad opens a door with a code, which can be changed and, on most commercial models, tied to a specific person. Cards, fobs and mobile credentials identify each user electronically, so the system knows who opened which door and when, and access can be removed remotely.
The difference is control after the fact. A key works for whoever holds it, including copies nobody knows about. A keypad code can be passed along by word of mouth, but a code per user still produces a record, and a compromised code can be changed quickly. Cards and fobs are harder to share casually and can be limited to certain doors and hours. Mobile credentials work the same way through an app on the employee's phone, which saves issuing physical cards. Keyless entry for a business usually means one of these last three, connected to a controller that holds the user list.
Which access method is more reliable for a small business?
Keys are reliable mechanically, since they need no power or network, but give no assurance about who has access. Electronic access depends on power, a controller and sometimes the internet, so it needs battery backup and a mechanical override. Each method trades one kind of reliability for another, and none wins on every count.
Electric locks are set up either to unlock when power fails, for life safety, or to stay locked, for security, and the choice for a given door is often governed by fire and building codes. A system that relies on a cloud service should keep working locally if the internet drops, which is worth asking about before choosing one. Mobile credentials depend on the employee's phone being charged and present, so most systems keep a card or code as a fallback. Keys fail quietly instead: a copy made years ago works as well as the original.
What does each access method cost a small business?
Keys cost little up front but cost control: every departure raises a question about copies, and lost keys mean rekeying. Keypads cost code management. Cards and fobs cost hardware, installation and a process for issuing and revoking them. Mobile credentials cost a dependency on staff phones and, often, a recurring software subscription.
| Keys | Keypad | Cards and fobs | Mobile credentials | |
|---|---|---|---|---|
| Record of who entered | None | Per code, if codes are individual | Per user | Per user |
| Removing access | Rekey the lock | Delete or change the code | Deactivate the card | Revoke in the app |
| What it costs you | No control over copies | Codes get shared | Hardware and admin | Phone dependency, subscription |
Installation is usually the larger cost for electronic systems. A wired reader needs cabling to a controller, an electric strike or magnetic lock, and sometimes changes to the door hardware; a standalone wireless lock avoids most of that but may not connect to the alarm. That connection matters, because a door forced or held open can then raise an alarm, and on some systems a credential can disarm the alarm for that user. How door events and alarm records come together is covered in our guide to commercial alarm monitoring.
When does a mix of keys, keypads and credentials make sense?
A mix makes sense for most small businesses: a credential reader on the entrance staff use daily, keypads or credentials on interior rooms like stock or records, and keyed locks kept on rarely used doors and as an override. The doors that open most often, or protect the most, are where electronic access pays back first.
Starting with one or two doors lets a business learn how it uses the system before expanding. Doors that stay keyed are better served by a restricted keyway, where copies can only be cut with authorization, and the list of key holders should be short and written down. Emergency exits must keep opening from the inside regardless of what is installed on the outside. For how access control fits with the alarm and cameras, see our overview of business security systems, and for planning the doors in a specific building, our commercial security service.