The Best Electronic Signature APIs in 2026
These electronic signature APIs were researched from official websites, including pricing pages, plan tables, and product documentation. Rankings focus on the core job, value for money, and verified features, helping buyers compare the building blocks needed for embedded electronic signature workflows.
Our top picks
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Top ranked
Adobe Acrobat Sign#1 of 289.4/10A capable enterprise signing API with broad workflows, integrations, and no free plan.
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Runner-up
BoldSign#2 of 288.9/10A low-cost signing API with embedded workflows, automation, and broad integrations.
Free plan · 30-day trial
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Top-ranked free plan
Documenso#3 of 288.9/10A flexible signing API for teams that want open-source control and self-hosting.
Free plan
Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. Bought places stand at the number bought; this page and our disclosure say so. Paying vendors may get a fuller, more detailed review from our editors, and that review can change their score. How we rank.
The full ranking 28 tools, best first
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Best forEnterprise API signing and integrations
A capable enterprise signing API with broad workflows, integrations, and no free plan.
- Bulk sending
9.4/10★★★★★Visit site -
Best forLow-cost API signing with broad features
A low-cost signing API with embedded workflows, automation, and broad integrations.
- Bulk sending
Free plan · 30-day trial Our BoldSign verdict → Visit BoldSignFor vendors Sponsor this spot · #2 · $99/mo →8.9/10★★★★☆Visit BoldSign -
Best forSelf-hosted and open-source API signing
A flexible signing API for teams that want open-source control and self-hosting.
- Bulk sending
8.9/10★★★★☆Visit Documenso -
Best forAPI signing with identity and bulk workflows
A developer-focused signing API with identity, bulk sending, callbacks, and templates.
- Webhooks
- Embedded signing
- Templates
Pricing on request · 30-day trial Our Scrive API verdict → Visit Scrive APIFor vendors Sponsor this spot · #4 · $69/mo →8.9/10★★★★☆Visit Scrive API -
Best forSimple, affordable embedded signing
A practical, affordable API for embedded signing, templates, and document automation.
- Bulk sending
8.9/10★★★★☆Visit SignWell -
Best forFeature-rich API signing for growing teams
A feature-rich signing API for teams building signature workflows into business software.
- Webhooks
- Embedded signing
- Templates
8.6/10★★★★☆Visit Blueink -
Best forOpen-source API signing with identity checks
A flexible signing platform for developers and organizations that need open-source options.
- Bulk sending
8.5/10★★★★☆Visit DocuSeal -
Best forMature, full-featured API programs
A mature eSignature API platform with broad integrations, automation, and flexible workflows.
- Bulk sending
8.3/10★★★★☆Visit DocuSign -
Best forHospitality and payment-linked signing
A specialized signing and payment workflow platform for hospitality and travel teams.
- Bulk sending
8.2/10★★★★☆Visit Sertifi -
Best forSecure enterprise API signing
A feature-rich signing API for regulated organizations, with paid plans and enterprise controls.
- Bulk sending
8.1/10★★★★☆Visit OneSpan Sign -
Best forLow-volume pay-as-you-go API signing
A focused API for teams that want embedded signing without monthly or seat fees.
- Webhooks
- Embedded signing
- Templates
8.0/10★★★★☆Visit site -
Best forEstablished API signing with broad authentication
A mature signing platform with API embedding, broad authentication, and a free plan.
- Bulk sending
7.9/10★★★★☆Visit Foxit eSign -
Best forMobile and enterprise signing with authentication
A capable choice for authenticated signing, bulk workflows, and enterprise integrations.
- Bulk sending
7.9/10★★★★☆Visit Foxit eSign -
Best forBroad-platform API signing in a business suite
A broad-platform signing API with free entry and enterprise workflow coverage.
- Bulk sending
7.9/10★★★★☆Visit Zoho Sign -
Best forStraightforward API signing with sealed PDFs
A focused signing API with templates, webhooks, and sealed PDFs.
- Webhooks
- Embedded signing
- Templates
7.9/10★★★★☆Visit site -
Best forFocused API signing with strong authentication
A focused signing API with Nordic identity methods, templates, and embedded workflows.
- Embedded signing
- Templates
7.9/10★★★★☆Visit Assently -
Best forWhite-label embedded signing deployments
A focused API-first signing platform for white-label, multi-tenant deployments.
- Webhooks
- Embedded signing
- Templates
7.9/10★★★★☆Visit ctSignature -
Best forAPI-first signing with many business connections
A connector-friendly signing API with embedded workflows, webhooks, and templates.
- Webhooks
- Embedded signing
- Templates
7.9/10★★★★☆Visit Esig API -
Best forFlexible API signing and approval workflows
A flexible signing API with strong workflow features and a narrow integration footprint.
- Webhooks
- Embedded signing
- Templates
7.8/10★★★★☆Visit Legalesign -
Best forEnterprise-grade signing standards and platforms
A broad, enterprise-focused signing platform with standards, APIs, identity checks, and flexible deployment.
7.7/10★★★★☆Visit Namirial Sign -
Best forVery low-volume pay-per-envelope signing
A low-cost signing API with embedded workflows, templates, webhooks, and white labeling.
- Webhooks
- Embedded signing
- Templates
7.6/10★★★★☆Visit Firma.dev -
Best forAPI signing with mobile apps and AI tools
A flexible signing platform with APIs, mobile apps, AI tools, and a free plan.
7.5/10★★★★☆Visit Signeasy -
Best forEuropean API signing with identity features
A paid European signing platform with API access, identity features, and strong workflow coverage.
7.3/10★★★★☆Visit Signaturit -
Best forOpen-source self-hosted signing workflows
A flexible signing platform for teams that want open-source control and workflow automation.
- Bulk sending
7.1/10★★★★☆Visit OpenSign -
Best forAffordable mainstream API signing
A broad electronic signature API platform with flexible workflows and paid-only access.
- Bulk sending
7.0/10★★★★☆Visit signNow -
Best forAffordable API signing with multiple authentication modes
A flexible, affordable signing API with templates, callbacks, bulk signing, and multiple authentication modes.
- Webhooks
- Templates
- Bulk sending
6.8/10★★★☆☆Visit Signority API -
Best forDeveloper teams needing SDK breadth
A broad signing API for developer teams that need SDKs and embedded workflows.
- Embedded signing
5.6/10★★★☆☆Visit Dropbox Sign -
Best forHospitality and payment-linked signing
A specialized signing and payment workflow platform for hospitality and travel teams.
- Bulk sending
5.3/10★★★☆☆Visit Sertifi
No tools match those filters.
Compare at a glance
| # | Tool | Free plan | Paid from | Score |
|---|---|---|---|---|
| 1 | Adobe Acrobat Sign | No | 9.4 | |
| 2 | BoldSign | Yes | $5/user/mo | 8.9 |
| 3 | Documenso | Yes | $25/mo | 8.9 |
| 4 | Scrive API | No | 8.9 | |
| 5 | SignWell | Yes | $10/mo | 8.9 |
| 6 | Blueink eSignature API | No | $90/mo | 8.6 |
| 7 | DocuSeal | Yes | $200/user/yr | 8.5 |
| 8 | DocuSign eSignature | Yes | $11/user/mo | 8.3 |
| 9 | Sertifi by Flywire | No | 8.2 | |
| 10 | OneSpan Sign | No | $22/user/mo | 8.1 |
| 11 | eSignatures.com API | No | $0.49/unit usage-based | 8.0 |
| 12 | Foxit eSign | Yes | 7.9 | |
| 13 | eSign Genie (now Foxit eSign) | No | 7.9 | |
| 14 | Zoho Sign | Yes | 7.9 | |
| 15 | Document eSign API | No | $20/mo | 7.9 |
| 16 | Assently API | No | €255/mo | 7.9 |
| 17 | ctSignature | No | $29/mo | 7.9 |
| 18 | Esig API | Yes | 7.9 | |
| 19 | Legalesign API | No | £10/mo | 7.8 |
| 20 | Namirial Sign | 7.7 | ||
| 21 | Firma.dev | No | €100/mo | 7.6 |
| 22 | Signeasy | Yes | $10/seat/mo | 7.5 |
| 23 | Signaturit | No | €10/user/mo | 7.3 |
| 24 | OpenSign | Yes | 7.1 | |
| 25 | signNow | No | $8/user/mo | 7.0 |
| 26 | Signority API | Yes | $129/yr | 6.8 |
| 27 | Dropbox Sign API | No | $75/mo | 5.6 |
| 28 | Sertifi | No | 5.3 |
Head-to-head All 22 comparisons →
- Adobe Acrobat Sign vs Documenso
- Adobe Acrobat Sign vs Scrive API
- Adobe Acrobat Sign vs SignWell
- Adobe Acrobat Sign vs Blueink eSignature API
- BoldSign vs Documenso
- BoldSign vs Scrive API
- BoldSign vs SignWell
- BoldSign vs Blueink eSignature API
- Documenso vs Scrive API
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How we rank electronic signature APIs
Every tool on this page was researched by iTechGuides Editors from its official website — pricing pages, plan tables and product documentation. We rank on how well each one does this category's core job, what the free or entry plan includes, and where it falls short. Where we have enough verified facts, the score out of 10 is a rubric — job fit, value and how much we could verify — shown with its breakdown on every tool's page; a tool we have not verified enough to score yet shows its rank without a number. Scores are re-checked when a product changes its plans. Read the full editorial policy, or submit a tool we missed.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
Last updated · How we research and update