The verdict in three sentences
For standard regulatory accounting, the off-the-shelf solution stays unbeatable: compliant, maintained, ready to use. Custom is only justified on your differentiating workflows — what sets you apart and a vendor will never automate. Over 5 years the two are close on raw cost; the choice turns on vendor lock-in, extensibility and code ownership.
Decision criteria, not just price
Before comparing euros, compare what truly matters over time.
| Criterion | Off-the-shelf | Custom |
|---|---|---|
| Regulatory bookkeeping | Excellent, current | To rebuild (pointless) |
| Differentiating workflows | Rigid | Excellent |
| Vendor lock-in | High | Low |
| Extensibility | Vendor roadmap | Your priorities |
| Code ownership | No | Yes |
| Time-to-value | Fast | 3-5 months |
| Update compliance | Included | To contract in |
The 5-year TCO, quantified
Comparison for an average firm (estimate, 2026, one firm, practice + production scope).
| Item | Established vendor | Custom |
|---|---|---|
| Annual subscription | 15,000-40,000 EUR | — |
| Initial development | 0 EUR | 50,000-80,000 EUR |
| Annual maintenance | Included | 10,000-15,000 EUR |
| Legal updates | Included | Within maintenance |
| Year 1 cost | 15,000-40,000 EUR | 60,000-95,000 EUR |
| 5-year total | 75,000-200,000 EUR | 90,000-140,000 EUR |
| Ownership at the end | None | The code |
Over 5 years, custom becomes competitive as soon as the vendor subscription exceeds ~25,000 EUR/year, and clearly wins beyond 30,000 EUR/year — especially if it removes costly manual tasks.
Mini case study
Eric, CFO of a group of firms totaling 55 staff in Manchester, pays 34,000 EUR/year in vendor subscription, i.e. 170,000 EUR over 5 years. His group consolidation and reporting stay patched together in spreadsheets, costing 12 h/week for two controllers (24 h at 60 EUR = 74,880 EUR/year). A custom foundation at 76,000 EUR + 14,000 EUR maintenance/year (146,000 EUR over 5 years) automates reporting, saves 60% of that time (~44,900 EUR/year) and leaves him code ownership: decision made for custom on the differentiating scope, keeping the vendor for standard production.
FAQ
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Can custom fully replace a vendor?
Rarely profitably: regulatory accounting is a commodity far better served by a vendor. Custom shines on the differentiating business layer above it.
What is the real risk of an established vendor?
Lock-in: price hikes, imposed roadmap, hard-to-extract data. Budget it in the TCO, not just this year's subscription.
From what subscription does custom become competitive?
Beyond around 25,000 EUR/year per firm, amortizing a build over 5 years becomes comparable, before even counting time saved.
Can we combine both?
Yes, and it is often optimal: vendor for regulatory production, custom connected by API for steering, reporting and client relationship.
Who owns the data and code with custom?
You. Documented code and exportable data are contractual deliverables, sharply reducing lock-in risk.
Let's scope your project. Send us your current subscription, your headcount and the 2-3 processes that cost you most; we will model the TCO of both options with an 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.
