The verdict in three sentences
For a Dublin maintenance company (lifts, HVAC) organising 90 on-call technicians in a spreadsheet, an on-call scheduling app costs, as a 2026 order of magnitude, EUR 15,000 to 30,000 excluding VAT for a 3 month project. It automates the rotation, blocks rosters that breach rest periods and calculates on-call allowances directly for payroll. The most visible gain for management is the end of payroll errors and disputes with technicians.
The app's cost, feature by feature
An on-call spreadsheet works as long as one person masters it. Once week swaps multiply, night call-outs pile up and allowances vary by day, errors reach the payslips.
| Feature | Core version | Full version |
|---|---|---|
| Automatic rotation by area, skill and certification | EUR 3,500 | EUR 6,000 |
| Checks on 11-hour daily and 24-hour weekly rest | EUR 2,500 | EUR 4,500 |
| Week swaps between technicians with approval | EUR 1,500 | EUR 3,000 |
| SMS alerts and escalation calls if no answer | EUR 2,500 | EUR 5,000 |
| Mobile call-out logging (call time, duration, site) | EUR 2,000 | EUR 4,500 |
| Allowance calculation and payroll export | EUR 2,000 | EUR 4,500 |
| Testing, training and go-live | EUR 1,000 | EUR 2,500 |
| Total | EUR 15,000 | EUR 30,000 |
Rest period checks protect the company: under the Organisation of Working Time Act 1997, a 3 a.m. call-out cuts into the 11-hour daily rest, which must then be compensated. The app flags the technician who cannot start at 8 a.m. and suggests a replacement.
Spreadsheet, off-the-shelf software or custom app
General scheduling tools handle office hours well, and on-call rules specific to a sector agreement or company agreement much less well.
| 2026 option | Upfront cost (order of magnitude) | Recurring cost | On-call allowances |
|---|---|---|---|
| Shared spreadsheet | EUR 0 | 6 to 8 hours a week of planning | Manual calculation, frequent errors |
| General SaaS scheduling tool | EUR 1,000 to 3,000 setup | EUR 5 to 12 per user per month | Simple rules only |
| On-call module of a CMMS | EUR 5,000 to 15,000 | EUR 30 to 60 per technician per month | Fine if the CMMS is already in place |
| Custom app | EUR 15,000 to 30,000 | EUR 3,000 to 5,000 a year | Agreement rules encoded 100 % |
| Custom app connected to the CMMS | EUR 25,000 to 40,000 | EUR 4,000 to 6,000 a year | Call-outs flow in without re-entry |
For 90 technicians, a CMMS module at EUR 45 a month represents EUR 48,600 a year. In that case custom pays back in under a year.
The allowance rules to configure
The on-call allowance depends on the company agreement or the applicable sector agreement. A typical grid includes a weekly flat rate (for example EUR 150 to 250), a premium for public holidays, and pay for call-out time, which is working time with its own night and Sunday premiums. The app must also handle travel time, counted as call-out time. The typical schedule: weeks 1 to 3 scoping rules with HR, weeks 4 to 9 development, weeks 10 to 12 testing in parallel with the spreadsheet over a full payroll month.
Mini case study
Need a professional website?
Kolonell builds websites that attract clients, optimized for the Sénégalese market. Free quote in 2 minutes.
Ciaran, technical director of a maintenance company in Dublin (illustrative scenario), schedules 90 technicians across 4 areas. His assistant spends 7 hours a week on the roster and 2 days a month checking allowances, about 530 hours a year, roughly EUR 19,000 at EUR 36 per loaded hour. Allowance errors generate about 12 corrections a month and two near-miss complaints to the Workplace Relations Commission in 2025. With an app at EUR 24,000 and EUR 4,000 of annual maintenance, planning time drops to 1 hour a week. Time savings alone reach about EUR 15,500 a year, a payback in under 2 years, not counting the reduced employment risk.
FAQ
How much does an on-call scheduling app cost in 2026?
As an order of magnitude, EUR 15,000 to 30,000 for a 3 month project, plus EUR 3,000 to 5,000 a year for maintenance and hosting.
Does the app check legal rest periods?
Yes, it checks the 11 hours of daily rest and 24 hours of weekly rest, and alerts when a night call-out prevents starting at the planned time.
How are night emergency calls handled?
The customer or call centre triggers an alert, the app calls and texts the on-call technician, then moves to the next one if nobody answers within 10 minutes.
Can allowances be exported to our payroll software?
Yes, through an import file or an API depending on the software. The format is validated during testing over a full payroll month.
Do technicians need to install an app?
An installable web app on Android and iPhone is enough, with no app store required. It works offline for logging call-outs in basements and lift shafts.
Let's scope your project. Send us your technician count, your on-call rules and your payroll software, and we will price the app with go-live in 3 months. 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.
