The verdict in three sentences
Integrating e-signature (Yousign, DocuSign, or an eIDAS foundation) costs 5,000 to 20,000 EUR of development plus 0.50 to 3 EUR per signature depending on the evidence level. It drops the signing cycle from 5 days to a few hours, removes print/scan/mail, and secures eIDAS-compliant legal weight. Beyond 200 signatures/month, the ROI is immediate.
The three eIDAS levels and their cost
eIDAS defines three signature levels: simple, advanced, and qualified. The higher the level, the stricter the identity check and the higher the per-signature cost. The choice depends on the document's legal stakes.
| eIDAS level | Typical use | Cost per signature (EUR) | Identity check |
|---|---|---|---|
| Simple | Quotes, internal POs | 0.50 - 1.20 | Email / SMS OTP |
| Advanced (AES) | Commercial, HR contracts | 1.20 - 3.00 | ID document + selfie |
| Qualified (QES) | High-stakes deeds | 3.00 - 8.00 | Video / in-person ID |
| Server seal | Bulk-issued documents | 0.20 - 0.60 | Organization certificate |
Most B2B flows are fine with the advanced signature, a good balance of legal weight and cost.
Integration cost and providers
Development covers the API call, envelope/signer management, status tracking (webhooks), evidentiary archiving, and the flow UX. 2026 orders of magnitude in France:
| Item | Range (EUR) | Detail |
|---|---|---|
| Simple API integration | 5,000 - 9,000 | 1 flow, 1-2 doc templates |
| Multi-flow integration | 10,000 - 20,000 | Reminders, roles, NF Z42 archiving |
| Platform subscription/month | 30 - 300 | By volume and features |
| Cost per advanced signature | 1.20 - 3.00 | Volume-degressive |
| Evidence vault/month | 50 - 200 | 10-year retention |
| Annual maintenance | 900 - 3,000 | API updates, support |
Yousign (European, GDPR-native) is often the most competitive for France; DocuSign brings wider international coverage and broader CRM connectors.
Mini case study
Mr. Diop, partner at a business law firm in Paris, has 350 mandates and agreements signed monthly, today printed, scanned, and mailed back. The average cycle is 5 business days and ties up 0.5 admin FTE.
He integrates an advanced signature for 12,000 EUR plus 2 EUR/signature (i.e. 700 EUR/month) and a 150 EUR/month subscription. The cycle drops below 4 hours, print/scan disappears (paper + archiving savings ~400 EUR/month), and he frees the equivalent of 0.4 FTE. Estimated net monthly gain: ~1,200 EUR. The dev investment pays back in ~10 months, after which the firm saves time and legal reliability every month.
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FAQ
Does an e-signature carry the same weight as a handwritten one?
Yes, eIDAS gives it full legal value in Europe. The qualified signature even has the strongest evidentiary weight, equivalent to handwriting before a judge.
What does a signature really cost in 2026?
From 0.50 EUR (simple) to 3 EUR (advanced), and up to 8 EUR for a qualified signature with video identification.
How long to integrate e-signature into my app?
A simple integration takes 2 to 4 weeks; a multi-signer flow with evidentiary archiving, 6 to 10 weeks.
From what volume is it profitable?
From 200 signatures/month, savings on paper, postage, and admin time exceed the cost of signatures and subscription.
Can I stay GDPR-compliant?
Yes, by picking a Europe-hosted provider (such as Yousign) and a compliant evidence vault, with controlled retention of identity data.
Let's scope your project. Give us your monthly signature volume, the target eIDAS level, and your current tools (CRM, DMS), and we quote the integration and per-signature cost. 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.
