The verdict in three sentences
PSA/ATS SaaS (Bullhorn, Boondmanager) is excellent to start: $30 to $90/consultant/month, staffing and engagement tracking out of the box. But when your day-rate billing model and staffing rules fall outside the standard, each extra consultant inflates the bill and forces compromise. Custom at $40,000-85,000 pays back fast beyond 20-25 consultants, mainly through utilization gains.
Selection criteria: SaaS vs custom
SaaS imposes its data model and bills per seat. Custom fits how you sell engagements, with native payroll, accounting and e-signature connectors.
| Criterion | PSA/ATS SaaS | Custom software |
|---|---|---|
| Recurring cost | $30 - 90/consultant/month | Retainer $500 - 1,100/month |
| Initial investment | Low | $40,000 - 85,000 |
| Multi-criteria staffing | Standard | 100% your rules |
| Day-rate billing | Generic | Tailored (T&M, fixed, milestones) |
| Payroll/accounting/e-sign connectors | Vendor-dependent | Native |
| Per-engagement margin tracking | Limited | Real time |
| Go-live time | 2 - 6 weeks | 12 - 18 weeks |
The typical scope covers staffing (consultant/engagement assignment), engagement tracking (time, progress, margin), multi-model day-rate billing, and connectors to your payroll, accounting and e-signature.
ROI by consultant count
With an average day rate of $700 to $1,200, each utilization point matters. 2026 order-of-magnitude.
| Consultants | SaaS (yr) | Custom (retainer + 4-yr amort.) | Utilization gain (+10 pts) |
|---|---|---|---|
| 10 | ~$8,400 | ~$22,000 | ~$130,000/yr |
| 20 | ~$16,800 | ~$23,000 | ~$260,000/yr |
| 30 | ~$25,200 | ~$24,000 | ~$390,000/yr |
| 50 | ~$42,000 | ~$26,000 | ~$650,000/yr |
| 80 | ~$67,000 | ~$28,000 | ~$1,040,000/yr |
Software cost becomes trivial against revenue: +10 utilization points generate hundreds of thousands of dollars, and automation saves 220 hours per year on engagement billing.
Mini case study
Elodie, partner of a 28-consultant firm in New York, pays a PSA at $60/consultant/month, about ~$20,000/year, with utilization capped at 78%. Custom software at $72,000 + $900/month retainer, amortized over 4 years, comes to ~$29,000/year. Lifting utilization to 88% (+10 pts) across 28 consultants at $850 average day rate over 210 billable days yields ~$500,000/year of additional revenue. Custom pays back in a few months.
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FAQ
Aren't Bullhorn or Boondmanager enough?
For a standard firm, yes. Custom is justified when your billing models (T&M, fixed, milestones, success fee) and staffing rules are too specific for SaaS configuration.
Can we connect payroll and accounting?
Yes, it's central. Custom integrates with your payroll, Sage or NetSuite and an e-signature tool, eliminating double entry across engagement, invoice and payroll.
How long to be operational?
12 to 18 weeks. The staffing + day-rate billing core ships first, payroll/accounting/e-sign connectors follow.
How do you measure utilization in real time?
The software cross-references available capacity, sold engagements and logged time to show utilization per consultant and team, with bench alerts.
Does the retainer cover evolutions?
Yes for routine changes and fixes. Large modules (client portal, advanced BI) are quoted separately but remain your property.
Let's scope your project. Tell us your consultant count, average day rate and billing models: we'll price staffing, billing and connectors. 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.
