The verdict in three sentences
A field time-tracking app replaces paper timesheets with reliable, time-stamped, geolocated mobile entry. Budget 20,000 to 55,000 EUR and 3 to 5 months for a PWA or native app with GPS clock-in, reports and payroll export. The return is twofold: -30 % payroll errors and several admin days saved every month.
Paper or app: the real hidden cost
Paper time tracking looks free, but every error is paid in undue wages, disputes or re-keying hours. 2026 comparison.
| Item | Paper time tracking | Mobile app |
|---|---|---|
| Hour reliability | approximate | time-stamped and geolocated |
| Payroll errors | 3-6 % of payroll | < 1 % |
| Re-keying time | 1-2 d/month | near zero |
| Hour disputes | frequent | GPS traces on hand |
| Payroll close time | 5-8 days | 1-2 days |
| Presence proof | none | time-stamp + location |
On a payroll of several hundred thousand euros, even 3 % errors represent a sum that funds the app in one year.
The hours and payroll ROI
Profitability rests on three levers: errors avoided, admin time saved and disputes reduced. Orders of magnitude for a 40-worker firm.
| Lever | Annual base | Estimated gain |
|---|---|---|
| Payroll errors avoided | 1.6M EUR payroll, -30 % errors | 14,000-24,000 EUR |
| Admin time | 1.5 d/month x 350 EUR | 6,300 EUR |
| Hour disputes avoided | 4-6 cases/year | 3,000-6,000 EUR |
| Faster payroll close | 4 days saved/month | improved cash flow |
| Total annual gain | - | 23,000-36,000 EUR |
With a 20,000 to 55,000 EUR investment, the app pays back in 12 to 20 months depending on crew size.
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Mini case study
Karim, owner of a 38-worker earthworks firm in Nantes, faces 4-5 % payroll errors and two labor-tribunal disputes a year over hours. He invests 41,000 EUR in a GPS time-tracking PWA delivered in 4 months. In the first year: errors cut below 1 %, saving 19,000 EUR, plus 1.5 admin days a month recovered (6,300 EUR) and zero hour disputes. Total gain 25,000 EUR, an app paid back in 20 months and profitable every year after.
FAQ
PWA or native, which to choose? A PWA is enough for time tracking and reports at lower cost; native is justified for high-frequency photos, heavy offline mode or system notifications.
Is geolocation legal? Yes, if proportionate (site clock-in/out), declared and transparent to employees; frame it in a policy and inform staff.
Does it work without network on remote sites? Yes, the app stores entries offline and syncs on reconnection; essential in rural areas or basements.
How does payroll export work? The app generates a file or connects to your payroll software via API, removing manual re-keying and its errors.
How long to roll out in the field? Budget 2 to 4 weeks of adoption after delivery, with short training for crew leaders and early-weeks support.
Let's scope your project. Tell us your field headcount, payroll software and indicative budget, and we'll frame a 20,000-55,000 EUR time-tracking app. Detailed quote within 48 h. WhatsApp +221 77 596 93 33.
Mohamed Bah
Fondateur, Kolonell
Passionate about digital and entrepreneurship in Africa, Mohamed has been helping Sénégalese businesses with their digital transformation since 2020. Founder of Kolonell, he believes every SME deserves a professional and accessible online présence.
