APISign vs zSign
A side-by-side comparison built from both listings. Blank cells mean the company has not given that detail; we never guess.
APISign compared with zSign
| Detail | 
APISign | 
zSign |
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| What it does | E-signature API for AI agents and developers to send legally binding contracts via MCP server, REST API or CLI
| Legally binding e-signatures with prepaid credits, no per-seat pricing
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| Stage | Not given
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| Founded | Not given
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| Based in | Not given
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| Pricing model | Paid
| Freemium
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| Pricing | $0.25 per contract sent; $0 monthly fee; 20 free contracts to start
| Starter: $27 USD for 50 envelopes (54¢ each); Growth: $87 USD for 250 envelopes (34.8¢ each); Scale: $297 USD for 1,000 envelopes (29.7¢ each); White-label: $49 USD/month with 100 envelopes/month included. Free: 3 envelopes after email verification, 25 after referral signup.
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| Key features | - Markdown and Word document templates with variables
- MCP server with twelve tools for template and contract management
- REST API with JSON over HTTPS
- Test mode with no charge
- Signed webhooks for contract events
- Audit log with IP address, device and timestamp
- Custom branding on signing pages and documents
- Gilberto AI writing assistant for template drafting
- No per-signer or per-seat charges
- CLI for contract operations
| - Court-ready audit trail with SHA-256 hashes and timestamps
- ESIGN/UETA compliant legally binding signatures
- No per-seat pricing; add unlimited teammates
- Credits never expire
- Template links for reusable signature requests
- White-label branding with custom domain and email
- Programmatic credit purchases via API
- 3 free envelopes after email verification
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| What makes it different | - Pay per contract sent, not per month or per seat
- No credit card required to start, 20 free contracts included
- Integrated with official MCP registry for AI agent use
- Lowest published API pricing compared to DocuSign, Dropbox Sign, and others
| - Pay per envelope, not per user seat
- No subscription required; credits never expire
- Built for AI agents with MCP server support
- Court-ready tamper-evident completion certificates
- Referral program pays 30% lifetime commission
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| Community votes | 0 | 0 |
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| DR (Domain Rating by Ahrefs) | 1 ● no change since last check | 1 ● no change since last check |
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| Trust Flow (Majestic) | 2 | 0 |
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| Citation Flow (Majestic) | 29 | 22 |
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| Referring domains (Majestic) | 48 | 24 |
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5 details filled in for both companies.
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