Firma.dev

Firma.dev provides an electronic signature API that lets developers embed document signing capabilities directly into their applications without redirecting users elsewhere, adding signing workflows with just a few lines of code via REST API. It is fully white-label and rebrandable with a business's own UX and branding, and is ESIGN, UETA, eIDAS, GDPR, ISO 27001, and SOC 2 compliant. Firma.dev supports unlimited teams with complete data isolation per customer, real-time webhooks for document status and signing progress events, and multiple document formats including templates, direct PDF uploads, and form builders. Pricing is pay-as-you-go at €0.049 per signed envelope, with no contracts or monthly minimums and unlimited team access from day one.