Overview
Firma.dev and Wirable serve completely different purposes, but both are developer-friendly tools that solve specific pain points. Firma.dev is an ultra-low-cost e-signature API designed for SaaS companies to embed signing workflows directly into their applications. Wirable, on the other hand, tests whether AI agents can use your web product, providing a score out of 100 and offering a hosted MCP proxy to fix issues without code changes.
Feature Comparison
| Feature | Firma.dev | Wirable |
|---|---|---|
| Core Purpose | E-signature API for embedding signing workflows into SaaS apps | AI agent-readiness testing and MCP proxy hosting for web products |
| Target Audience | Developers, SaaS teams, startups needing cheap e-signatures | Product teams, AI engineers, companies wanting agent-compatible products |
| Integration Method | REST API, embeddable iFrame, pre-built UI components | URL-based audit, MCP proxy, GitHub PRs for fixes |
| Pricing Model | Pay-as-you-go €0.029 per envelope, no subscriptions | Free tier (3 audits), Pro at $29/month for unlimited audits + proxy |
| White-Labeling | Fully white-label with custom branding and UX | Not applicable (testing tool, not embeddable) |
| Compliance/Certifications | SOC 2, ISO 27001, eIDAS, GDPR, ESIGN, UETA | Not mentioned (focus on agent compatibility) |
| API Documentation | Swagger/OpenAPI, webhooks, sample apps | No public API for users; provides MCP proxy endpoint |
| Team Management | Unlimited teams with data isolation and permissions | Not applicable (single product testing) |
| Real-time Features | Event streams, webhooks for signing status | Drift monitoring on commits (Pro) |
| Free Trial | Free sandbox with unlimited test documents | 3 free audits with live browser and score |
Pricing
Firma.dev: €0.029 per envelope with no monthly fees, no minimums, and no contracts. You buy credits as needed. A free sandbox allows unlimited testing with real documents before paying anything. This is about 99% cheaper than traditional providers like DocuSign.
Wirable: Free tier includes 3 full agent-readiness audits with three agents, live browser testing, and a shareable score. Pro tier costs $29/month and includes unlimited audits (fair use), a hosted MCP proxy kept live in front of your product, drift monitoring on every commit, and GitHub fix PRs for issues like llms.txt or AGENTS.md.
Pros and Cons
Firma.dev
Pros:
- Extremely low cost (99% cheaper than DocuSign)
- Developer-first with simple REST API and quick integration
- Fully white-label and resell-ready for SaaS platforms
- Strong compliance (SOC 2, ISO 27001, eIDAS, GDPR)
- Free sandbox with unlimited usage for testing
Cons:
- Limited to e-signature use case only
- No native mobile SDK mentioned (iFrame works but not dedicated)
- Pricing per envelope may add up for high-volume senders
Wirable
Pros:
- Unique niche: tests AI agent compatibility of web products
- Clear scoring system (0-100) with evidence
- Free audit available without account
- MCP proxy fixes agent issues without code changes
- Drift monitoring ensures ongoing compatibility
Cons:
- Narrow focus (only agent-readiness, not general testing)
- Pro pricing at $29/month may be steep for occasional use
- No compliance certifications mentioned
- Limited to web products with public URLs
Verdict
Firma.dev is the clear choice for SaaS teams needing an affordable, embeddable e-signature solution with strong compliance and white-labeling. Its pay-as-you-go model and developer-first approach make it ideal for startups and platforms that want to add signing without breaking the bank. Wirable is a specialized tool for product teams who want to ensure their web product works seamlessly with AI agents, offering a unique audit and fix workflow. Choose Firma.dev for document signing, Wirable for agent-readiness testing.
Firma.dev
Wirable