APISign vs Popform
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 Popform
| Detail | 
APISign | 
Popform |
|---|
| What it does | E-signature API for AI agents and developers to send legally binding contracts via MCP server, REST API or CLI
| AI-powered contract management and e-signatures with unlimited documents for one flat price
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| Stage | Not given
| Not given
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| Founded | Not given
| Not given
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| Based in | Not given
| US
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| Pricing model | Paid
| Not given
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| Pricing | $0.25 per contract sent; $0 monthly fee; 20 free contracts to start
| Free 14-day trial with all features. Pro plan: $11/mo per user billed annually (save 42% compared to monthly billing).
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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
| - Unlimited e-signatures
- AI field detection
- AI data extraction
- Audit trails
- Contacts and companies management
- Team workspaces
- PDF tools
- MCP server for AI integration
- Mobile optimized signing
- Email notifications
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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
| - One simple flat-rate pricing with all features included
- Connected to Claude, ChatGPT, and any MCP-compatible AI assistant
- AI automatically detects and extracts contract data
- ESIGN and UETA compliant for legally binding signatures
- AWS-based infrastructure with ISO 27001 certification
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| Community votes | 0 | 0 |
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| DR (Domain Rating by Ahrefs) | 1 ● no change since last check | 26 ● no change since last check |
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| Trust Flow (Majestic) | 2 | 7 |
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| Citation Flow (Majestic) | 29 | 30 |
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| Referring domains (Majestic) | 48 | 123 |
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4 details filled in for both companies.
More alternatives to APISign More alternatives to Popform