QR, card and biometrics compared for attendance systems
06.09.2026
A comparison of QR, card and biometrics lets you see the three main options for an attendance system side by side. There is no universally best solution - the choice depends on the working pattern, the number of points and the budget. This guide compares the three approaches across seven criteria and gives a practical decision algorithm.
The basis of the three approaches
- Card - the "something you have" principle. A physical card plus a reader.
- Biometrics - the "something you are" principle. A fingerprint or face plus a terminal.
- QR - the "a device you have" principle. A code plus the employee's phone.
Overall comparison
| Criterion | Card | Biometrics | QR |
|---|---|---|---|
| Initial cost | Medium | High | Low |
| Adding a point | A reader | A terminal | Free |
| Consumables | Cards | None | None |
| Transfer risk | High | None | Managed |
| Field work | Not suitable | Not suitable | Suitable |
| Personal data | Minimal | Heavy | Minimal |
| Phone requirement | None | None | Yes |
Criterion-by-criterion analysis
Cost
The difference in initial cost is clear, but the more important difference is in the cost of expansion. With cards and biometrics every new point means a device; with QR there is no additional cost. When the three-year total is calculated, the number of points becomes the decisive factor.
Reliability
Cards and biometrics depend on the device: when it fails, that point's records stop. QR has no single point of failure, but it does depend on the employee's phone.
Recording accuracy
Biometrics is strong on this criterion because the record is bound to a physical characteristic. The card is the weakest - handing it over is enough, and no technical measure fully prevents that.
Mobile check-in, however, is not a single check. The device the record was made on, cases where that device changed, and whether the record matches the location of the entry point work together, and a mismatch reaches the responsible person as a notification. Keeping the comparison at the level of "a code can be shared, biometrics cannot" therefore leaves the picture incomplete - the criterion is not the code itself but the control layers around it.
Suitability for conditions
In harsh physical conditions biometrics weakens (dirty hands, helmets, lighting). Cards are stable in that respect. QR does not depend on conditions at all, because the reading happens on the employee's device.
Personal data
Biometric data cannot be changed and creates an ongoing obligation. With cards and QR the stored data consists of the moment of the record and the point.
A practical example
A company operated three branches and two warehouses with 140 employees. A three-year calculation was prepared for each of the three options.
The biometric option required five terminals, installation and maintenance. The card option meant five readers, 140 cards and roughly 30 card replacements a year. The QR option carried only the subscription.
The decision, however, was determined not by cost but by another factor: the company planned to open two more branches the following year. In the device-based options that meant additional budget requests.
The choice settled on QR. The terminal in the cash area stayed in place as physical access control, while attendance moved to a single system for the whole structure - keeping two parallel timesheets had been creating reconciliation work at month end.
The decision algorithm
- Is physical control required? Yes → turnstile plus card or biometrics.
- Do employees have phones? No → card or biometrics.
- Are there more than three points? Yes → QR is more economical.
- Is there field work? Yes → QR is the only practical option.
- Is the transfer risk critical? Yes → biometrics at that point.
The answers to these five questions usually lead to a hybrid model, and that is a normal outcome.
The hybrid model
The structure that works most often in practice is this: biometrics or a turnstile at the critical point, QR at all remaining points, and reporting unified in one system. This model satisfies both the security requirement and the need to scale.
Comparing the administrative load
The daily management effort of the three options differs, and this is rarely counted in the cost calculation.
The card system creates the highest ongoing load: producing cards, replacing lost ones, temporary workarounds for forgotten cards, and collecting cards back from leavers.
Biometrics requires enrolment and template management: capturing a template for each new employee, re-enrolling those whose recognition degrades, synchronising across terminals, and deleting and documenting the data of leavers.
QR carries the lightest load: an employee is added or deactivated; there is no physical object.
This difference can be decisive in sectors with high staff turnover - retail, services, seasonal work.
Recommendations by sector
Beyond the general table, practical guidance for specific sectors is useful.
Office, one entrance, stable workforce - all three options work; the decision follows the budget and phone availability.
Manufacturing - hand conditions make fingerprint difficult; a card or code-based approach is more reliable. If phones are restricted, use a hybrid model.
Construction and field work - a fixed device is impractical; the code-based approach is the only real option.
Retail chains - many points with few employees at each; a device-based option is uneconomical.
High-security zones - biometrics together with physical control.
After the decision
Choosing a system is not the end - how the rollout is run also affects the outcome. Three steps are the same for every option.
The first is writing down the rules: lateness threshold, breaks, overtime, incomplete records and exceptions. This document is independent of the system and must be prepared before it.
The second is a pilot period: one department, in parallel with the existing method, for at least one full month. The month-end process must be tested too.
The third is agreeing the report format with the payroll team. When this step is skipped, part of the time saved by automation returns as reformatting work.
These three steps determine the success of the rollout regardless of which technology you choose.
The structure of total cost
The most common mistake in comparing the three options is relying on the initial cost. A practical decision should be built on the three-year total.
For the card system the calculation includes: readers, installation, the initial card set, annual card replacement, spare devices and maintenance.
For biometrics: terminals, installation and lighting, the time spent managing templates, legal documentation, spare devices and maintenance.
For the code-based system: the subscription and printing the codes.
The cost of a new point must be added to each list - that is where companies meet an unexpected figure during a structural change.
When the calculation is done, the number of points becomes the main variable: with fewer than three points the difference is limited, with more it grows rapidly.
In summary
In a comparison of QR, card and biometrics there is no universal winner - each has its own setting. The card is simple but carries the transfer and consumables problems. Biometrics is the most accurate but is sensitive to conditions and creates legal obligations. QR is the most flexible and scalable but requires a smartphone.
Five questions decide it: is physical control required, are there phones, how many points exist, is there field work, and is the transfer risk critical.
The answers usually lead to a hybrid model - the most practical outcome.
The next step
The best way to complete the comparison is a practical one-month trial. The table provides the basis for a decision; real conditions have the final word.
QRGate works in both fully mobile and hybrid scenarios. See what QRGate can do or calculate the price.
