Card-based check-in or QR code check-in?
06.09.2026
Card-based check-in or QR code check-in - these two are the closest rivals, because both rest on "something you carry": a plastic card in one case, a phone in the other. In practice the difference is large: cards get lost, get replaced and require readers, while QR uses a device the employee already has. This guide compares the two models on real use and cost.
How each works
Card system: each employee is issued a personal card and a reader is installed at the entry point. The card is presented to the reader and the record is made.
QR system: a code is created for each entry point. The employee scans the code with their phone and the record enters the system.
A notable difference: in a card system the device sits at the point and the card with the employee; in a QR system the code sits at the point and the device with the employee.
Comparison
| Criterion | Card | QR |
|---|---|---|
| Device per point | A reader is required | Not required |
| Means for the employee | A card is issued | Their own phone |
| Loss and replacement | An ongoing cost | None |
| A new employee | A card is produced | Added to the system |
| Transfer risk | High | Managed by technical measures |
| A new point | A new reader | Minutes |
| Field work | Not suitable | Suitable |
| Phone requirement | None | Yes |
The weak point of the card system
The biggest problem with a card system is behavioural rather than technical: the card can be handed over. "Take my card and check in for me" is the classic weakness of this approach, and no technical measure removes it entirely.
The second problem is consumables: cards get lost, break and are forgotten. Every lost card means a new card, re-registration and a temporary workaround. In a company of a hundred people that means dozens of incidents a year.
The strength of the card system
- No phone required - suitable for a workforce without smartphones.
- Simple to use and requires no training.
- Integrates easily with turnstiles and access control.
- Reliable in a stable, enclosed environment.
The strength of QR
- The number of points does not affect cost.
- No consumables - no cards to produce or replace.
- Works for field and site-based work.
- A new employee is connected immediately.
- Employees can see their own hours.
A practical example
A company had run a card system for six years. While preparing an annual report an interesting figure emerged: on average 34 cards were replaced every year - through loss, damage and staff turnover.
Beyond that, two readers had failed and the same model was no longer sold. Software compatibility would have to be verified for a new model.
The calculation showed that the annual cost of cards, a spare reader and maintenance was several times the QR subscription. The decision to switch was taken; the card system was retained only at the main entrance, which was linked to a turnstile.
Security comparison
The core risk is the same in both systems - the means being handed to someone else. With a card this is practically hard to prevent. With QR it is managed through dynamic codes, point verification and anomaly reports. Details are on the QR security page.
Which to choose
- One or two fixed entrances, no phones, an existing turnstile → card.
- Many points, field work, growth plans → QR.
- Mixed conditions → hybrid: card at the entrance, QR at the sites.
Managing the cards
The daily administrative load of a card system is rarely calculated at the decision stage, yet it is continuous.
The recurring operations are: producing and activating a card for a new employee, blocking a lost card and issuing a replacement, arranging a temporary solution for a forgotten card, and collecting the card back from a departing employee with deactivation.
In a company of a hundred people these events repeat dozens of times a year. Each is small - a few minutes - but together they create a significant time and consumables cost.
In a code-based system all of these operations happen inside the software: the employee is added or deactivated, and there is no physical object.
Seasonal and temporary staff
The difference between the two models is sharpest in seasonal work.
In a card system every seasonal worker needs a card produced, and it must be collected back when the season ends. In practice a portion of the cards is never returned and a new order is placed every season.
For contractor crews the situation is more complex still: issuing cards to an external company's employees is both an administrative and a security matter.
In a code-based system temporary staff are added as a separate group and deactivated when the period ends. Because there is no physical object, there is no collection problem either.
For companies with seasonal operations this difference alone can determine the decision.
The transition scenario
Moving away from an existing card system does not mean abandoning it entirely - a staged approach works better in practice.
In the first stage new points are built on codes: a new branch, a warehouse, a site. Existing readers keep working where they are.
In the second stage readers that fail or whose model is discontinued are not replaced - that point is converted to the code-based approach.
In the third stage a decision is taken: keep the remaining devices, or switch fully. Points linked to turnstiles are usually kept.
The condition for this approach is that attendance recording stays in one system. A card reader can be kept for opening the door, but once the record is split in two, the month-end work of reconciling two sources by hand reappears - and most of the gain disappears right there.
Comparing recording accuracy
The recording accuracy of the two systems is not the same, and the difference lies in the conditions of use rather than in the technology.
In a card system the main problem is transfer. A card is a physical object and can be given to someone else; there is practically no technical mechanism to prevent that. In practice the risk exists in every company, only at different levels.
The second problem is the forgotten card: the employee has arrived but has no card. The record is then made by hand and accuracy falls. In practice this repeats dozens of times a month.
In a code-based system the means is the employee's phone - the probability of forgetting it is considerably lower. The transfer risk is managed through dynamic codes and point verification.
In both systems the organisational measure that most affects accuracy is regular review of the anomaly report.
In summary
Card and QR systems rest on the same principle - the means you carry. The difference lies in what that means is: a plastic card issued by the company, or the employee's own phone.
In practice that single difference produces three outcomes: consumable costs disappear, no reader is needed at a point, and field work becomes possible.
The card keeps its place, though - in companies with a workforce without phones and an existing turnstile infrastructure. In those cases a hybrid arrangement is the most practical solution.
The next step
There is a simple way to assess an existing card system: how many cards were replaced last year, and how many times did a reader cause a problem? Those two figures form the financial basis of the decision.
QRGate provides recording without cards or readers. See what QRGate can do or calculate the price.
