Zoho Sign
by Zoho Sign Free plan Free trial From $10 a month, billed yearly AndroidiPhone & iPadWebWindowsMacBrowser extension+1
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Best Electronic Signature APIs 2026
Facts read 20 Sep 2026 – 15 Oct 2026
Electronic signature APIs let an app send documents for electronic signing. This list helps buyers compare signing tools by the capabilities and pricing details makers publish.
The standings: top 10
| Name | In a line | Record score | Price from | Try it free | Runs on | Facts read |
|---|---|---|---|---|---|---|
| 01 Zoho Sign | 6.4 | $10 a month, billed yearly | Free plan | Android, iPhone & iPad, Web, Windows | 15 Oct 2026 | |
| 02 OpenSign | OpenSign may suit individuals and businesses that need document signing, reusable templates, or API-based signing workflows. | 6.3 | $9.99 a month | Free plan | Web, Windows, Mac, Linux | 15 Oct 2026 |
| 03 Dropbox Sign API | It suits developers who want to embed electronic signature workflows in websites or applications. | 5.8 | $75 a month, billed yearly | Free plan | Android, iPhone & iPad, Web, API | 1 Oct 2026 |
| 04 Signeasy | Signeasy suits individuals or teams that need to sign and manage documents across mobile and web, or developers building eSignature workflows through an API. | 5.7 | $10 a month, billed yearly | Free plan | Android, iPhone & iPad, Web, API | 3 Oct 2026 |
| 05 Sertifi by Flywire | 5.6 | Free plan | Free plan | Android, iPhone & iPad, Web, API | 15 Oct 2026 | |
| 06 Signority API | Signority API suits businesses integrating signature and document workflows into other systems. | 5.6 | Free plan | Free plan | Web, Windows, API, Self-hosted | 1 Oct 2026 |
| 07 BoldSign | BoldSign may suit individuals or teams sending documents for signature, including developers embedding signing workflows through its APIs and SDKs. | 5.5 | $5 a month, billed yearly | Free plan | Android, iPhone & iPad, Browser extension, API | 28 Sep 2026 |
| 08 eSignatures.com API | 5.5 | Free plan | Free plan | Web, API | 8 Oct 2026 | |
| 09 Blueink eSignature API | 5.4 | $90 a month, billed yearly | Free plan | Web, API | 7 Oct 2026 | |
| 10 Documenso | Documenso suits individuals, teams, builders, and organizations needing web, API, embedded, or self-hosted signing workflows. | 5.1 | $25 a month, billed yearly | Free plan | Web, API, Self-hosted | 3 Oct 2026 |
The finder places newer releases before older ones and uses maker-published figures; it does not score tools. Compare free plans, paid starting points, signing controls, automation fields, signer limits and supported platforms.
02
OpenSign
OpenSign may suit individuals and businesses that need document signing, reusable templates, or API-based signing workflows.
WebWindowsMac+3 Record6.3 Visit
03
Dropbox Sign API
It suits developers who want to embed electronic signature workflows in websites or applications.
AndroidiPhone & iPadWeb+1 Record5.8 Visit
04
Signeasy
Signeasy suits individuals or teams that need to sign and manage documents across mobile and web, or developers building eSignature workflows through an API.
AndroidiPhone & iPadWeb+1 Record5.7 Visit
05
Sertifi by Flywire
AndroidiPhone & iPadWeb+1 Record5.6 Visit
6
Signority API
WebWindowsAPI+1 Free plan Record5.6 Visit Signority API suits businesses integrating signature and document workflows into other systems.
7
BoldSign
AndroidiPhone & iPadBrowser extension+1 $5 a month, billed yearly Record5.5 Visit BoldSign may suit individuals or teams sending documents for signature, including developers embedding signing workflows through its APIs and SDKs.
10
Documenso
WebAPISelf-hosted $25 a month, billed yearly Record5.1 Visit Documenso suits individuals, teams, builders, and organizations needing web, API, embedded, or self-hosted signing workflows.
15
DocuSign eSignature
API $11 a month, billed yearly Record4.7 Visit It suits individuals and organizations that send agreements for signatures and need tools such as reusable templates, approval workflows, or renewal tracking.
17
Sertifi
WebAPI Free plan Record4.5 Visit Sertifi suits hospitality businesses that handle contracts, event paperwork, payments, or card authorizations.
20
DocuSeal
API $20 a month Record4.2 Visit DocuSeal suits organizations needing electronic signatures, templates, bulk requests, or API integration.
Before you choose
Compare the starting cost
Check the Free plan and Paid from fields together. A free plan can be available alongside paid pricing, while a free trial may provide a separate way to try a tool.
Read billing notes closely when they specify annual terms, such as a monthly price marked annual.
Match the signing workflow
Compare Embedded signing, Signer authentication and Signing order. These fields show the workflow controls listed for the tool.
Review Bulk sending and Maximum signers when your documents involve repeated sends or more than one signer.
Check templates and webhooks
Templates and Webhooks are comparison fields for API projects. Check the listing for the capabilities you need before choosing a tool.
Choose a deployment platform
Listings can run on api, web, android, ios, windows or self-hosted environments. Match the listed platform to where your signing flow will run.
Review code availability
Open-source code is offered by tools in this category. If you need to read or change code, look for an open-source listing and check its licence before adoption.
Questions
Do these electronic signature APIs have free plans?
A free plan is offered by tools on this list. Check the Free plan field for the listing you are considering.
Can I try an API before paying?
A free trial is offered by tools on this list. Trial terms vary, so check the listing's pricing note.
Which platforms do these tools support?
Listed platforms include api, web, android, ios, windows and self-hosted. Check the platform shown for the tool you need.
What signing features can I compare?
Compare Embedded signing, Signer authentication, Signing order, Bulk sending, Maximum signers, Templates and Webhooks.
Are open-source options available?
Open-source code is offered by tools on this list. Review the relevant listing and its licence before using the code.
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