Firma.dev
A developer API that adds legally-binding e-signatures to any app for a few cents per document, instead of days of DocuSign integration work.
🔗 Visit Firma.dev
Description
Think of Firma.dev as a signature stamp you can bolt onto any website or app: instead of building your own way to let people sign documents, or paying a lot of money for a big-name tool like DocuSign, a developer plugs in this API and gets a working "sign here" flow in hours, not weeks, at a fraction of the per-document cost.
Firma.dev is a REST API for embedding legally-compliant electronic signatures (ESIGN, UETA, eIDAS, GDPR, HIPAA-compliant) directly into SaaS products, at €0.049 per envelope with no minimums or contracts. It ships with an OpenAPI-documented REST API, an embeddable template editor and signing widget, webhooks, white-label branding, multi-tenant workspaces for isolating customer data, and a 7-language signing interface supporting Latin, Cyrillic, Greek, Japanese and Korean scripts. Launched July 2026, it's EU-hosted (AWS Paris + Stockholm CDN) and closed-source.
💬 Our review
The short version: if you're a developer who needs e-signatures inside your own product and don't want to pay DocuSign or SignNow prices, Firma.dev is worth a serious look — it's dramatically cheaper and built API-first from day one.
At €0.049/envelope, Firma.dev undercuts DocuSign (whose per-envelope cost is well over €1 once you're off the cheapest plans) and even budget APIs like SignNow (~€0.50+) by an order of magnitude. The trade-off of being brand-new (launched July 2026) is an unproven track record: no public case studies, no visible customer list, and a small team by definition — worth confirming SOC 2/ISO 27001 claims directly before trusting it with sensitive contracts. For a startup embedding signatures into its own onboarding flow, the price alone makes it worth testing; for a large enterprise with compliance review cycles, an established vendor with a longer history may still be the safer first choice.
💰 Pricing
📊 Global score
🤖 AI-enriched data
€0.049 per envelope (pay-as-you-go, no contract); optional priority support add-on at €100/month
Pros
Roughly 10-20x cheaper per envelope than DocuSign
Developer-first REST API with OpenAPI docs, live in hours not weeks
Broad compliance claims: GDPR, SOC 2, ISO 27001, HIPAA, eIDAS, ESIGN, UETA
7-language signing UI with multi-script signature support
Cons
Launched July 2026 — no track record, no visible public customers yet
Closed-source, single small vendor — worth confirming compliance certs directly rather than taking marketing copy at face value
10MB per-document upload limit
No free perpetual tier, only a trial