SignatureAPI
SignatureAPI: A focused signing API for developers building embedded workflows. Ranked #28 of 33 in Electronic Signature Software by our editors (6.4/10); pricing: Paid; best for developers building embedded signing workflows.
At a glance
- Editor score6.4 / 10
- PricingPaid
- Best forDevelopers building embedded signing workflows
- Free planNo
- Paid from$25/mo
- Monthly send limit100 /mo
- Facts checked19 Sep 2026
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
Our verdict on SignatureAPI
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.
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SignatureAPI pricing
All 2 SignatureAPI plans and prices →
SignatureAPI fact sheet
| Free plan | No |
|---|---|
| Paid from | $25/mo |
| Monthly send limit | 100 /mo |
| Templates included | Not verified |
| Bulk sending | No |
| Signing order | Both |
| Audit trail | Yes |
| API access | Yes |
| Identity verification | Yes |
| Deployment | Cloud |
| Platforms | Web |
| Integrations | 2 integrations: Microsoft Power Automate, Zapier |
| Pricing | Paid (source) |
| Website | signatureapi.com |
| Facts checked | 19 Sep 2026 |
SignatureAPI integrations
SignatureAPI lists 2 integrations on its own site.
- Microsoft Power Automate
- Zapier
Alternatives to SignatureAPI
- DocuSign eSignatureA broad e-signature suite with flexible workflows, integrations, and tiered sending limits.9.4
- BoldSignA low-entry e-signature service with templates, signer controls, and embedded API options.9.2
- Zoho SignA flexible signing service with a free plan and workflow options from templates to APIs.9.0
See all SignatureAPI alternatives →
Also Ranked In
SignatureAPI is ranked in 2 of our directories.
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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