Overview
Firma.dev and PandaProbe Cloud are both developer-focused platforms, but they serve entirely different purposes. Firma.dev is an ultra-low-cost e-signature API designed for SaaS companies to embed document signing into their applications. PandaProbe Cloud is a fully managed platform for tracing, evaluating, and monitoring AI agents. This comparison highlights their key differences to help you choose the right tool for your specific needs.
Feature Comparison
| Feature | Firma.dev | PandaProbe Cloud |
|---|---|---|
| Primary Function | E-signature API for embedding signing workflows | Full-stack tracing, evals, and monitoring for AI agents |
| Target Audience | Developers, SaaS teams, startups needing document signing | AI/agent engineering teams, developers building agents |
| Integration Approach | REST API, embeddable iFrame, pre-built UI components, webhooks | SDK/API for trace ingestion, eval runs, and monitoring dashboards |
| White-Label / Branding | Fully white-label with custom branding and UX | Not applicable (internal tooling) |
| Compliance & Security | SOC 2, ISO 27001, eIDAS, GDPR, ESIGN/UETA compliant | SSO, RBAC, data retention management (enterprise) |
| Infrastructure Management | Fully managed API – no infrastructure to maintain | Fully managed cloud – zero infrastructure to maintain |
| Pricing Model | Pay-as-you-go at €0.029 per envelope, no minimums | Free tier + subscription plans ($29–$299/mo) with usage-based overages |
| Free Tier | Free sandbox with unlimited test documents | Hobby plan: 100 base traces/mo free forever |
| Eval / Testing Capabilities | Sandbox environment for testing signing flows | Built-in eval scheduler, LLM-as-judge, trace eval runs |
| Team Management | Unlimited teams with data isolation and permissions | Seat-based plans (1–unlimited seats) |
Pricing
Firma.dev
- Pay-as-you-go: €0.029 per envelope (about 3¢). No monthly fees, no contracts, no minimums.
- Free Sandbox: Unlimited test documents with a sandbox API key – pay only when you send real documents.
- No hidden costs: Buy credits as needed.
PandaProbe Cloud
- Hobby (Free): 100 base traces/mo, 100 trace eval runs/mo, 10 session eval runs/mo, 1 seat.
- Pro ($29/mo): 5k base traces/mo, 5k trace eval runs/mo, 100 session eval runs/mo, 2 seats. Pay-as-you-go overages.
- Startup ($299/mo): 50k base traces/mo, 50k trace eval runs/mo, 1k session eval runs/mo, 10 seats.
- Enterprise (Custom): Unlimited seats, custom SSO, SLA, dedicated support.
Pros and Cons
Firma.dev
Pros:
- Ultra-low cost – 99% cheaper than DocuSign
- Developer-first with clean REST API and quick integration
- Fully white-label and resell-ready
- Strong compliance (SOC 2, ISO 27001, eIDAS, GDPR)
- Free sandbox with unlimited test documents
Cons:
- Limited to e-signature use case only
- No free tier for production sending (pay per envelope)
PandaProbe Cloud
Pros:
- Fully managed infrastructure – zero ops overhead
- Built-in eval LLM and embedding models
- Auto-scaling and continuous monitoring
- Flexible pricing with free hobby plan
- SSO and role-based access control
Cons:
- Narrow focus on AI agent tracing and evals
- Subscription + usage costs can add up for high volumes
Verdict
Choose Firma.dev if you need an affordable, developer-friendly e-signature API to embed signing into your SaaS product. Choose PandaProbe Cloud if you're building AI agents and need managed tracing, evals, and monitoring without infrastructure headaches. Both are purpose-built for developers but solve completely different problems.
Firma.dev
PandaProbe Cloud