By Four Sides Group Published
There is no single type of access control. The technology that works for a 50-employee corporate office is not necessarily the best fit for a 500-person factory or a sports club with thousands of members. Choosing the right type depends on access volume, the required security level, the infrastructure available and the budget.
Why the type of access control matters
Access control is not just about "who gets in and who doesn't." It also means traceability, real-time occupancy control, integration with payroll and attendance, visitor management, emergency response and regulatory compliance.
Type 1: Proximity cards (RFID)
The most widespread standard in offices. Chips that are read by radio frequency when held near the reader.
Pros: low cost per credential, mature infrastructure, easy to use, works with a visible ID badge.
Cons: they can be lost or lent out, need to be replaced, and don't guarantee that the person using the card is the authorized holder.
When it makes sense: companies with medium-to-high volume where the replacement process is manageable.
Type 2: Biometric control (fingerprint, face, iris)
Identifies people by unique physical characteristics.
Pros: can't be lost or lent, identifies the actual person, eliminates card costs, provides true traceability.
Cons: higher upfront cost, issues under adverse conditions, privacy and regulatory considerations, requires infrastructure.
When it makes sense: restricted areas, time and attendance for payroll, regulatory compliance.
Type 3: QR code and mobile app control
A dynamic QR code in an app on the user's phone.
Pros: eliminates physical credentials, dynamic codes are hard to forge, remote management, excellent for visitors.
Cons: depends on the phone, requires an app, creates friction for less tech-savvy users.
When it makes sense: modern offices, coworking spaces, buildings with heavy visitor traffic, temporary events.
Type 4: PIN or passcode control
A numeric code entered on a keypad.
Pros: inexpensive infrastructure, no physical credentials.
Cons: codes get shared, no individual traceability, vulnerable to shoulder surfing.
When it makes sense: secondary applications, low-traffic interior doors, as a backup.
Type 5: Multi-factor
Combines two or more methods: card + fingerprint, QR + PIN, biometric + badge.
Pros: significantly higher security, meets strict regulatory standards.
Cons: higher cost, more day-to-day friction, two systems to manage.
When it makes sense: data centers, areas with sensitive information, laboratories, vaults.
Type 6: License plate recognition (LPR)
Plate recognition. It controls the vehicle, not the person.
Pros: fast flow in parking areas, no need to roll down the window, traceability of authorized vehicles.
Cons: depends on plate condition, false positives/negatives, doesn't identify who is in the vehicle.
When it makes sense: high-traffic vehicle entrances, residential communities, industrial parks, clubs with member parking.
One zone, the right technology
Successful companies don't pick just one type: they combine biometrics for time clocks (where real identity matters), RFID cards for general areas, multi-factor for critical zones and LPR for parking. Custom integration software manages it all on a single platform.
Summary comparisonAll 6 technologies in a single table
| Type | Upfront cost | Security | Ease of use | Best for |
|---|---|---|---|---|
| RFID card | Low-Medium | Medium | High | Corporate offices |
| Biometric | High | High | Medium | Critical areas, attendance |
| QR/Mobile app | Medium | High | High | Modern companies, visitors |
| PIN | Very low | Low | Medium | Secondary uses |
| Multi-factor | Very high | Very high | Low | Maximum security |
| Vehicle LPR | Medium-High | Medium | Very high | Vehicle entrances |
How to choose the right type for your company
- Map your zones by security level. Not every part of your building needs the same solution.
- Define the volume at each access point. An entrance handling 500 people per hour needs technology that doesn't create lines.
- Review your current infrastructure. Connectivity, cabling, doors, lighting.
- Consider day-to-day administration. Who will enroll users? How often?
- Plan 3-5 years ahead. Growth, new sites, operational changes.
- Evaluate integration with other systems. Payroll, attendance, video surveillance, visitors.
The role of custom software
Hardware manufacturers ship their own software, but it often limits integration or forces rules that don't fit your business.
Custom software built on top of the physical infrastructure lets you:
- Integrate multiple hardware brands and types under a single system
- Set specific access rules (schedules, zones, profiles)
- Integrate with payroll, attendance, CRM and ERP
- Get tailored reports and dashboards
- Evolve as your business changes
Frequently asked questions
Can I combine several types in the same company?
Yes, and it's common. Cards for general use, biometrics for attendance, multi-factor for critical areas, LPR for parking. Good software integrates everything on one platform.
Which is the most cost-effective over the long term?
Over 5 years, systems without physical credentials tend to be more economical for mid-size and large companies thanks to savings on replacements.
Are biometric systems compatible with privacy requirements?
They require informed consent and proper data handling. In Mexico, the LFPDPPP (Mexico's federal law on the protection of personal data held by private parties) applies. A well-implemented system includes privacy policies, secure storage and ARCO rights (access, rectification, cancellation and objection).
What happens when connectivity fails?
Professional systems work offline: authorized credentials are stored locally and keep working. When the connection returns, events are synchronized.
Can I switch systems without losing my investment?
It depends on the hardware. Some manufacturers use open standards; others have closed systems. It's important to evaluate this before the initial purchase.
Conclusion
There is no universally correct type. The choice depends on your operation, zones, volume and goals. Many companies combine several types, each where it adds the most value, under custom integration software.
Need to design an access control system?
We combine specialized hardware with custom integration software
See the Solution Book a Consultation
