The verdict in three sentences
A custom B2B booking web app costs, in 2026, from 15,000 to 40,000 EUR, over 8 to 14 weeks, with a calendar, online payment, notifications and a back office. It cuts no-shows by 30 to 50 % through automatic reminders and reduces appointment-management time by 60 %. For a services operator, it pays for itself through fewer lost slots and less admin work.
What the budget covers by tier
The price depends on the number of features and the complexity of the availability rules. Here are the three typical 2026 levels.
| Tier | Key features | Timeline | 2026 cost (EUR) |
|---|---|---|---|
| Essential | Calendar, booking, emails | 8-9 weeks | 15,000 - 22,000 |
| Business | + online payment, SMS, back office | 10-12 weeks | 22,000 - 32,000 |
| Premium | + multi-site, API, advanced roles, stats | 12-14 weeks | 32,000 - 40,000 |
| Mobile app option (PWA) | Install, push notifications | +2-3 weeks | +4,000 - 8,000 |
| Wave/OM payment option | African mobile collection | +1-2 weeks | +2,500 - 5,000 |
The step from Essential to Business is mainly online payment and the back office, which turn the tool into a real management hub.
Impact on no-shows and management time
A booking app's value is measured not in screens but in saved slots and freed hours. 2026 order of magnitude for an operator running 1,000 appointments a month.
| Indicator | Before (manual) | After (app) | Gain |
|---|---|---|---|
| No-show rate | 18 % | 9 % | -50 % |
| Lost slots / month | 180 | 90 | 90 saved |
| Appointment management time | 40 h/month | 16 h/month | -60 % |
| Cost of a lost slot | 45 EUR | 45 EUR | - |
| No-show loss / month | 8,100 EUR | 4,050 EUR | 4,050 EUR/month |
At 4,050 EUR saved per month on no-shows alone, a 27,000 EUR Business app pays back in about 7 months, before even counting the admin time recovered.
Mini case study
Thomas, head of a network of car-diagnostic centres in the Paris region, handles 1,200 appointments a month by phone and spreadsheet. His no-show rate hits 17 % and two staff spend 60 h/month scheduling slots.
He invests 28,000 EUR in a Business booking app with an online deposit. The deposits drop no-shows to 8 %, saving about 108 slots/month at 45 EUR = 4,860 EUR/month. Management time falls to 22 h/month (-63 %). Return on investment: under 6 months on no-shows alone, without counting the 38 admin hours freed each month.
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FAQ
What is the entry budget?
An Essential app (calendar + booking + emails) starts at 15,000 EUR for 8 to 9 weeks. Online payment and a back office move you to the Business tier, around 22,000 - 32,000 EUR.
How long to go live?
Expect 8 to 14 weeks depending on tier, including scoping, development and a pilot phase. A mobile PWA adds 2 to 3 weeks.
Does the app really cut no-shows?
Yes: automatic reminders and online deposits cut no-shows by 30 to 50 %. On 1,000 appointments/month with high absenteeism, that means several thousand euros saved every month.
Can I collect via Wave or Orange Money?
Yes, for an African market the Wave/OM mobile-payment option adds 2,500 to 5,000 EUR and enables a deposit at booking, very effective against no-shows.
What recurring costs should I plan?
Hosting and maintenance are an order of magnitude of 1,500 to 4,000 EUR/year, depending on booking volume and integrations (calendar, payment, SMS).
Let's scope your project. Share your appointment volume, availability rules and payment methods: we price the right tier with a schedule and indicative budget. 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.
