The verdict in three sentences
A field service app turns an overwhelmed tradesman into an organized pro: scheduling, quote signed on mobile, instant mobile-money collection and client history at your fingertips. Admin time drops 60 % and kept appointments rise 25 %, which means more billed jobs per day. As always, the call is between a custom app and a per-technician SaaS.
What a field service app does
For a plumber, electrician or refrigeration tech, the day is a string of jobs scattered across the city. The app geolocates technicians, schedules slots, generates the quote on site, captures the client's signature and triggers mobile-money collection before leaving the job.
| Function | Without app | With app 2026 |
|---|---|---|
| Admin time/day | Baseline | -60 % |
| Quote delivered | In 1-2 days | Signed on site |
| Payment collection | Deferred, chasing | Mobile money instant |
| Kept appointments | Baseline | +25 % |
| Client history | Notebook/memory | Full record |
| Jobs/day | 5-6 | 8 |
The most concrete win is the quote signed on mobile: instead of promising a quote "tomorrow" (and losing the client), the technician presents, adjusts and gets it approved on the spot.
Build or SaaS: the math by technician count
Build: Kolonell develops your custom app (around 400,000 FCFA), your colors and your rules. SaaS: around 10,000 FCFA/month per technician. For a solo tradesman or small shop, SaaS starts fast; once a team forms, build pays off.
| Technicians | SaaS/year (10,000 FCFA/mo) | Build (yr 1) | Build (yr 2+) |
|---|---|---|---|
| 1 technician | 120,000 FCFA | 400,000 FCFA | maintenance |
| 3 technicians | 360,000 FCFA | 400,000 FCFA | maintenance |
| 5 technicians | 600,000 FCFA | 450,000 FCFA | maintenance |
| 8 technicians | 960,000 FCFA | 500,000 FCFA | maintenance |
From 4-5 technicians, build costs less from year one and has no monthly fee. For a solo tradesman, SaaS at 120,000 FCFA/year is unbeatable to start.
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Mini case study
Parfait, a refrigeration tech in Nairobi, runs 3 technicians. Before the app, each did 5 jobs/day due to paperwork and poorly ordered routes. With the custom app (400,000 FCFA), they reach 8 jobs/day, so +3 per technician, meaning +9 jobs/day for the team. At an average ticket of 15,000 FCFA, that is 135,000 FCFA/day of extra revenue. In 3 working days the app is paid back; the rest is net gain.
FAQ
Can a tradesman who is not tech-savvy use it? Yes, the interface sticks to essentials: see today's jobs, open a record, get a signature, collect payment. It takes about half a day of on-site training to learn.
Is mobile-money collection really instant? The client scans a QR or gets a link, pays, and the technician sees confirmation in the app. No more "I'll pay later": the unpaid rate drops sharply.
How does the app raise kept appointments? An automatic SMS reminder the day before and the morning of reduces no-shows. For many shops, this alone lifts kept appointments to +25 % over baseline.
Can you manage parts and stock? Yes, the app can list parts used per job and alert when a common component (gas, seals, breakers) drops below a threshold, avoiding trips back to the store.
Does it work offline? The technician can view jobs and fill a record without network; sync happens once connection returns, with no data loss.
Let's talk about your project. We scope your field service app around your trade, team and payments. 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.
