The Best E-Signature APIs Software in 2026
We researched e-signature APIs from official vendor websites, including pricing pages, plan tables, and product documentation. Rankings focus on the category’s core job, value for money, and verified features that matter when embedding signing into applications and business workflows.
Our top picks
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Top ranked
DocuSign eSignature#1 of 269.4/10An e-signature suite with flexible workflows, API embedding, and plans for different team sizes.
No free plan · free trial
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Runner-up
Zoho Sign#2 of 269.2/10A flexible e-signature service with free entry, broad integrations, and enterprise APIs.
Free plan · 14-day trial
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Top-ranked free plan
Dropbox Sign#3 of 269.0/10An e-signature service with embedded API workflows, templates, and mobile apps.
Free plan · 30-day trial
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 26 tools, best first
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Best forOrganizations embedding e-signatures across workflows
An e-signature suite with flexible workflows, API embedding, and plans for different team sizes.
No free plan · free trial Our DocuSign eSignature verdict → Visit DocuSignFor vendors Sponsor this spot · #1 · $149/mo →9.4/10★★★★★Visit DocuSign -
Best forTeams needing broad integrations and deployment options
A flexible e-signature service with free entry, broad integrations, and enterprise APIs.
Free plan · 14-day trial Our Zoho Sign verdict → Visit Zoho SignFor vendors Sponsor this spot · #2 · $99/mo →9.2/10★★★★★Visit Zoho Sign -
Best forTeams needing API signing with mobile support
An e-signature service with embedded API workflows, templates, and mobile apps.
Free plan · 30-day trial Our Dropbox Sign verdict → Visit Dropbox SignFor vendors Sponsor this spot · #3 · $79/mo →9.0/10★★★★☆Visit Dropbox Sign -
Best forEnterprises prioritizing controlled signing workflows
A controlled signing platform for organizations embedding or scaling digital agreements.
8.8/10★★★★☆Visit OneSpan Sign -
Best forBudget-conscious teams needing API and bulk workflows
A flexible e-signature service with a free tier and a dedicated embedded-signing API plan.
Free plan · 30-day trial Our BoldSign verdict → Visit BoldSignFor vendors Sponsor this spot · #5 · $59/mo →8.8/10★★★★☆Visit BoldSign -
Best forTeams wanting self-hosted or low-cost API signing
Flexible e-signature APIs with self-hosting, embedded signing, and low-cost document pricing.
8.7/10★★★★☆Visit DocuSeal -
Best forTeams needing affordable API and mobile signing
Affordable API and mobile signing with broad workflows, but no free plan.
8.6/10★★★★☆Visit signNow -
Best forSmall teams seeking inexpensive API signing
A low-cost signing service with embedded API workflows and a useful free plan.
8.6/10★★★★☆Visit Xodo Sign -
Best forTeams combining mobile signing with API workflows
Mobile-friendly signing with an API, though sending limits shape lower-cost plans.
8.5/10★★★★☆Visit Signeasy -
Best forTeams wanting economical API access and integrations
An economical signing service with a free tier and REST API on Business.
8.4/10★★★★☆Visit SignRequest -
Best forSmall businesses needing a full-featured signing API
A broad signing API with a lifetime-free plan and paid tiers billed annually.
8.3/10★★★★☆Visit eSignly -
Best forTeams needing embedded signing and bulk workflows
SignWell combines embedded signing and bulk workflows with a free API-access plan.
8.3/10★★★★☆Visit SignWell -
Best forDevelopers needing identity checks and webhooks
A developer-focused signing API with embedded workflows, webhooks, and identity checks.
- Webhook events
8.2/10★★★★☆Visit Blueink -
Best forTeams embedding signatures into software at low volume
A flexible e-signature API with pay-per-document pricing and developer-focused workflows.
- Webhook events
8.1/10★★★★☆Visit Legalesign -
Best forTeams embedding low-cost contract signing
A focused signing API with embedded workflows and a $0.49 per-contract starting rate.
- Webhook events
8.1/10★★★★☆Visit site -
Best forDevelopers adding signing to SaaS products
An API for embedded signing, with usage-based pricing from €0.049 per envelope.
- Webhook events
8.0/10★★★★☆Visit Firma.dev -
Best forEuropean teams requiring qualified signatures
A flexible signing API with qualified signatures, though API access starts on Pro.
8.0/10★★★★☆Visit Skribble -
Best forDevelopers needing sandboxed API signing basics
A developer-focused signing API with sandbox endpoints, embeds, webhooks, and templates.
- Sandbox environment
- Webhook events
7.9/10★★★★☆Visit D4Sign API -
Best forOrganizations needing PKI or sealed-document flows
A focused signing API for applications that need PKI, identity-provider flows, or sealed documents.
- Sandbox environment
- Webhook events
7.8/10★★★★☆Visit Signicat -
Best forTeams needing PDF processing alongside document APIs
A PDF document API suite with a free tier, not a signature workflow API.
7.7/10★★★★☆Visit Adobe -
Best forDevelopers embedding signing into apps and workflows
An API-led signing service with embedded signing, dynamic templates, and webhooks.
7.7/10★★★★☆Visit SignatureAPI -
Best forTeams wanting an API sandbox and typed SDKs
An API-ready e-signature workspace with embedded tools, webhooks and typed SDKs.
- Sandbox environment
- Webhook events
7.6/10★★★★☆Visit eSignlabs -
Best forDevelopers seeking a straightforward sandboxed API
A sandboxed signing API for teams that can use E-Sign’s Enterprise plan.
- Bulk sending
- Sandbox environment
- Webhook events
7.5/10★★★★☆Visit E-Sign -
Best forTeams embedding signing and identity checks
A signing API for teams embedding agreement workflows and identity verification.
- Sandbox environment
- Webhook events
7.4/10★★★★☆Visit Youtrust -
Best forSelf-hosting teams seeking an open-source API option
Open-source, self-hostable e-signature API with broad workflows and a focused ecosystem.
7.3/10★★★★☆Visit OpenSign -
Best forLow-volume teams wanting pay-per-envelope API signing
Flexible envelope-based pricing pairs e-signing essentials with API access.
7.2/10★★★★☆Visit Signable
No tools match those filters.
Compare at a glance
| # | Tool | Free plan | Paid from | Score |
|---|---|---|---|---|
| 1 | DocuSign eSignature | Yes | $11/user/mo | 9.4 |
| 2 | Zoho Sign | Yes | 9.2 | |
| 3 | Dropbox Sign | Yes | $10.05/mo | 9.0 |
| 4 | OneSpan Sign | No | $22/user/mo | 8.8 |
| 5 | BoldSign | Yes | $5/user/mo | 8.8 |
| 6 | DocuSeal | Yes | $200/user/yr | 8.7 |
| 7 | signNow | No | $8/user/mo | 8.6 |
| 8 | Xodo Sign (formerly eversign) | Yes | $3/user/mo | 8.6 |
| 9 | Signeasy | Yes | $10/seat/mo | 8.5 |
| 10 | SignRequest | Yes | €9/user/mo | 8.4 |
| 11 | eSignly | Yes | $120/user/yr | 8.3 |
| 12 | SignWell | Yes | $10/mo | 8.3 |
| 13 | Blueink eSignature API | No | $90/mo | 8.2 |
| 14 | Legalesign API | No | £10/mo | 8.1 |
| 15 | eSignatures.com API | No | $0.49/unit usage-based | 8.1 |
| 16 | Firma.dev | No | €100/mo | 8.0 |
| 17 | Skribble | Yes | €23/user/mo | 8.0 |
| 18 | D4Sign API | No | 7.9 | |
| 19 | Signicat Electronic Signature API | No | 7.8 | |
| 20 | Adobe PDF Services API | Yes | 7.7 | |
| 21 | SignatureAPI | No | $25/mo | 7.7 |
| 22 | eSignlabs | Yes | 7.6 | |
| 23 | E-Sign | No | 7.5 | |
| 24 | Youtrust API | No | 7.4 | |
| 25 | OpenSign | Yes | 7.3 | |
| 26 | Signable | No | £341/yr | 7.2 |
Head-to-head All 7 comparisons →
- Zoho Sign vs Dropbox Sign
- Dropbox Sign vs OneSpan Sign
- Dropbox Sign vs BoldSign
- Dropbox Sign vs DocuSeal
- Dropbox Sign vs signNow
- OneSpan Sign vs BoldSign
- OneSpan Sign vs DocuSeal
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How we rank E-Signature APIs software
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