The verdict in three sentences
A plumber or electrician running a paper diary and quoting from memory loses work exactly when the client hesitates. A field service app turns booking, technician scheduling, an on-site signed quote and mobile money collection into one flow, raising jobs per day by ~20 %. A quote accepted and paid on the spot removes the grey zone where 80 % of unpaid balances are born.
Why paper is expensive for the tradesperson
The hidden cost is not the diary; it is the unplanned job, the wasted trip and the quote promised "tonight" that never leaves. A technician going from 5 to 6 jobs a day earns an extra month of salary every quarter.
| Module | What it does | Observed gain (2026 order of magnitude) |
|---|---|---|
| Online booking | Client books a slot 24/7 | -30 % missed calls |
| Technician scheduling | Route optimised by zone | +1 job/day |
| On-site quote | Template + tablet signature | Quote signed in 10 min |
| Before/after photos | Time-stamped visual proof | -50 % disputes |
| Auto invoice | PDF sent via WhatsApp | Same-day billing |
| Mobile money payment | Wave / Orange Money / Paystack | 0 unpaid balance |
Cost and timeline
Price depends on the number of technicians and modules. A solo tradesperson starts at the low end; a 6-technician firm targets the top with multi-team scheduling.
| Plan | Included modules | Price (FCFA) | Timeline |
|---|---|---|---|
| Essential | Booking + scheduling + quote | 600,000 - 900,000 | 3-4 weeks |
| Pro | + invoice + photos + mobile money | 1,200,000 - 1,800,000 | 5-7 weeks |
| Multi-team | + technician fleet tracking + B2B | 2,000,000 - 2,500,000 | 8-10 weeks |
| Target jobs/day | from 5 to 6-7 per technician | — | — |
Mini case study
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Modou, a plumber in Dakar, works with 2 helpers and does 5 jobs a day at an average margin of 25,000 FCFA, i.e. 125,000 FCFA/day. With the app and better routing he reaches 6 jobs: +25,000 FCFA/day, about 500,000 FCFA/month over 20 working days. The Pro app at 1,500,000 FCFA pays for itself in 3 months, not counting the unpaid balances avoided by on-site mobile money.
FAQ
Does the technician need to master complex software? No. The interface is three actions: see your route, fill a quote, collect payment. A tradesperson is self-sufficient after half a day.
Does it work with no network on a site? Yes, offline mode stores the quote and photos on the phone and syncs when the network returns. Essential in peri-urban areas.
Can you collect Wave and Orange Money directly? Yes, a payment link or QR code is generated on the invoice. The client pays from their phone and the balance drops to zero immediately, removing follow-up.
How many jobs pay back the app? At 25,000 FCFA margin, one extra job per day repays a 1,500,000 FCFA app in about 3 months. The return is mechanical.
Can we start small then add modules? Yes, we ship Essential then plug in invoicing, photos and B2B as you grow, without rebuilding.
Let's talk about your project. We frame your scheduling and on-site quotes into one app that pays off in the first quarter. 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.
