SignatureAPI review
A focused signing API for developers building embedded workflows.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
SignatureAPI is an electronic-signature platform for developers, software platforms, and organizations automating signing processes. Its REST API creates and manages envelopes, while embedded signing supports web and React Native applications. Teams can use DOCX templates with dynamic data and merge fields, route recipients sequentially or in parallel, collect signatures and form inputs, and retrieve signed deliverables with audit logs and certificates of completion. Recipient authentication options include email, email-code, and custom methods. Webhooks and Power Automate support event-driven and no-code workflows.
The Standard plan costs $25 per month and includes the first 100 envelopes and the first dashboard user. Additional dashboard users cost $20 each. The Enterprise plan uses contact-sales pricing and offers annual contracts and prepaid credits. Paid features include the REST API, embedded signing, templates, routing, authentication, interactive fields, webhooks, and workflow automation. SignatureAPI also provides AI tooling as part of the platform. The published plans do not present a production free plan.
SignatureAPI is less suitable for teams that need a dedicated bulk-sending workflow, since bulk sending is not provided as a dedicated endpoint. Its platform coverage is web and API rather than mobile platforms, and its listed integrations center on Microsoft Power Automate and Zapier. Organizations seeking broader integrations, mobile platforms, or a more traditional bulk-send experience should consider an alternative. For developers prioritizing embedded signing, programmable envelope management, and application-level workflow control, SignatureAPI offers a focused option.
SignatureAPI pros and cons
- Where it wins
- REST API with embedded signing for web and React Native apps
- Templates, routing, authentication, webhooks, and audit certificates
- Power Automate and Zapier integrations support workflow automation
- Where it doesn't
- No dedicated bulk-sending endpoint
- No production free plan
- Web and API access, without mobile platforms
SignatureAPI fact sheet, pricing and score →
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