The verdict in three sentences
To digitize invoice and purchase-order data entry, two options: an OCR/IDP SaaS (Mindee, Rossum) at 0.05-0.30 EUR/document or a custom LLM-based AI module at 12,000-30,000 EUR. SaaS wins at low and medium volume; custom becomes profitable beyond ~1,500 documents/month and when your formats are atypical. Target figure: go from 4 min to 20 s per invoice with a 92-98 % extraction rate.
Cost per document: SaaS vs custom
The SaaS model is simple but scales linearly with volume. Custom has a high fixed cost upfront, then near-zero marginal cost.
| Monthly volume | SaaS (0.05-0.30 EUR/doc) | Custom (amortized) |
|---|---|---|
| 500 invoices | 300-500 EUR/month (plan) | Not profitable |
| 1,000 invoices | 400-800 EUR/month | Break-even |
| 2,000 invoices | 600-1,500 EUR/month | 400-800 EUR/month (maint.) |
| 5,000 invoices | 1,200-3,000 EUR/month | 500-900 EUR/month (maint.) |
| Entry cost | Low (300-1,500 EUR/mo) | 12,000-30,000 EUR |
| Atypical formats | Limited | Custom |
Accuracy, validation, and time saved
No extraction is 100 % reliable. The right architecture routes human validation to doubtful cases only, not the entire flow.
| Metric | Manual entry | AI extraction 2026 |
|---|---|---|
| Time per invoice | 4 min | 20 s |
| Extraction rate | 100 % (but slow) | 92-98 % |
| Human validation | 100 % | 5-10 % of cases |
| Residual errors | 3-5 % | < 1.5 % |
| Data hosting | Internal | EU (GDPR) |
| Custom maintenance | — | 400-800 EUR/month |
Mini case study
Need a professional website?
Kolonell builds websites that attract clients, optimized for the Sénégalese market. Free quote in 2 minutes.
Sophie, chief accountant of an industrial mid-cap in Dubai, processes 2,000 supplier invoices/month. Two staff spend 4 min/invoice, about 133 h/month. At 26 EUR/h loaded, that's 3,458 EUR/month, or ~41,500 EUR/year. She deploys a custom AI module (22,000 EUR, EU-hosted, 600 EUR/month maintenance) cutting processing to 20 s/invoice with human validation on 8 % of cases. Time drops to ~15 h/month (390 EUR). Net saving: ~3,068 EUR/month, a payback in ~8 months including maintenance.
FAQ
Mindee/Rossum or a custom AI module? A SaaS IDP to start fast at low volume (0.05-0.30 EUR/document). A custom module beyond ~1,500 documents/month or for non-standard formats (specific purchase orders, multi-currency invoices).
What extraction rate is realistic in 2026? Between 92 and 98 % on structured invoices, as an order of magnitude. The rest goes to targeted human validation, still far faster than full manual entry.
Is my data protected? Yes, with EU hosting and GDPR-compliant processing. In custom builds, you can silo data and avoid any unmanaged third-party storage.
How long to deploy? A SaaS IDP: 1 to 2 weeks. A custom LLM-based AI module: 4 to 8 weeks, including a training/tuning phase on your real formats.
What if the AI gets it wrong? Low-confidence cases (5-10 %) are routed to human validation before posting to accounting, guaranteeing a residual error rate below 1.5 %.
Let's scope your project. Share your monthly volume, document types, and accounting tool: we'll price a SaaS solution or a custom AI module (12,000-30,000 EUR). 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.
