The verdict in three sentences
On a construction site, the paper timesheet is a sieve for ghost hours: you pay day laborers present on paper but not on the ground. A geolocated mobile app (clock-in + daily payroll calculation + multi-site) cuts fraud from 100 to 12 ghost hours/week and lowers daily payroll by 14 %. Across 80 workers and 3 sites, the investment pays back in 4 to 7 months.
Paper, biometric badge or geolocated app: the comparison
Three methods coexist in Senegal. Paper is free but falsifiable; the biometric badge is reliable but heavy to deploy on moving sites; the geolocated mobile app combines reliability and multi-site flexibility.
| Criterion (2026) | Paper | Biometric badge | Geolocated app |
|---|---|---|---|
| Setup cost | ~0 FCFA | terminal 300,000 - 800,000 FCFA | app 2,800,000 - 5,000,000 FCFA |
| SaaS cost / worker / month | 0 | variable | 1,500 - 3,000 FCFA |
| Fraud resistance | none | good | very good (GPS + photo) |
| Mobile multi-site | difficult | fixed terminal | native |
| Daily payroll calculation | manual | partial | automatic |
| Ghost hours / week | ~100 | ~30 | ~12 |
The geolocated app costs more upfront but is the only one suited to moving sites: the worker clocks in from their phone, their GPS position and a photo confirm real presence.
What digital attendance recovers every month
The real issue is not "presence", it is payroll leaking out. Here are the gains measured on comparable sites.
| Indicator | Before (paper) | After (app) | Gain |
|---|---|---|---|
| Ghost hours / week | 100 | 12 | -88 % |
| Daily payroll | baseline | -14 % | money recovered |
| Site manager clock-in time | high | -9 h/week | 9 h returned |
| Payroll calculation errors | frequent | near zero | fewer disputes |
| Multi-site visibility | none | real-time | control |
| Worker payroll disputes | many | timestamped proof | trust |
Mini case study
Ibrahima runs a construction firm in Dakar: 80 day laborers across 3 sites, average daily pay of 6,000 FCFA, i.e. a payroll of about 9,600,000 FCFA/month (80 x 6,000 x 20 days). He suspects ghost hours.
He deploys a custom app at 3,600,000 FCFA (light SaaS at 2,000 FCFA/worker/month = 160,000 FCFA/month). Result: daily payroll down 14 %, i.e. 1,344,000 FCFA saved/month, minus 160,000 FCFA SaaS = 1,184,000 FCFA net/month. Payback: 3,600,000 / 1,184,000 = ~3 months, plus 9 h/week returned to his site manager.
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FAQ
How much is a construction attendance app in 2026?
A custom app costs 2,800,000 to 5,000,000 FCFA, or in SaaS mode 1,500 to 3,000 FCFA/worker/month. The choice depends on worker count and whether you want to own the tool.
How does the app prevent clock-in cheating?
The worker clocks in from their phone with GPS geolocation and, depending on config, a timestamped photo. You go from about 100 ghost hours/week to 12.
Does it work across several sites at once?
Yes, that is the whole point: a single dashboard tracks attendance in real time across all your sites, unlike a fixed biometric terminal.
Does it calculate daily payroll automatically?
Yes. Clock-ins feed directly into payroll calculation per worker and per site, removing manual errors and reducing disputes.
How long to pay it back?
Across 80 workers and 3 sites, expect 4 to 7 months thanks to the 14 % drop in daily payroll, often less if fraud was high.
Let's talk about your project. We size your attendance app and your payroll savings within 24 hours. 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.
