Port Zero vs XSDHub

A side-by-side comparison built from both listings. Blank cells mean the company has not given that detail; we never guess.

Port Zero compared with XSDHub
Detail	Port Zero	XSDHub
What it does	Stable domains for local development ports, eliminating conflicts with free open-source tunnels and paid cloud options	XML validation and schema tools for developers
Stage	Not given	Not given
Founded	Not given	Not given
Based in	Not given	NL
Pricing model	Freemium	Freemium
Pricing	Free and Open Source: $0 (unlimited local tunnels, open source); Professional: $49/mo or $490/yr (unlimited cloud tunnels, visitor auth, feedback comments); Team: $149/mo or $1,490/yr (everything in Professional plus unlimited members, teams, shared subdomains, approvals, organization billing); Ente	Free: unlimited individual XML checks, local validation, no account required. Pro: US$19/month (US$190/year), batch 25 files, 10 cloud projects, 10 schemas, 300 validations + 250 invoices/day. Team: US$49/month (US$490/year), batch 100 files, 50 shared projects, 100 schemas, 5 seats, 1,000 validatio
Key features	Stable local domains (.portzero.local) for processes and containers Cloud tunnels (.tunnel.portzero.cloud) with HTTPS for LAN and internet access Support for multiple programming languages Git worktree support with per-branch URLs AI agent integration with MCP server Visitor authentication and access control Feedback comments on live tunnels Team access policies and approvals Audit log (Enterprise plan) Organization billing with no per-seat charges	Free local XML syntax and formatting checks XSD 1.0 validation with local imports and includes Optional XSD 1.1 and ISO Schematron XPath 1.0 server validation Cloud schema projects with version control Batch validation up to 25 files (Pro) or 100 files (Team) API access with daily quotas Public HTTPS schema import and structural comparison EN 16931 and XRechnung invoice validation Multi-format invoice validation (Factur-X, KSeF, RO e-Factura, HR-CIUS)
What makes it different	Eliminates port conflicts by assigning stable virtual domains instead of port numbers Free and open source for local use; no additional cost for cloud features on paid plans Flat pricing with no meters, overages, or per-seat charges Agent-ready with native MCP server integration for AI coding agents Works across multiple OS and languages with zero port bookkeeping required	Browser-based validation runs locally without uploading documents by default Explicit server processing consent required for any upload Comprehensive e-invoice validation across six European formats Built with AI assistance and documented with primary references
Free plan	Not given	Not given
Open source	Not given	Not given
Platforms	Not given	Not given
Public API	Not given	Not given
Community votes	0	0
DR (Domain Rating by Ahrefs)	1 no change since last check	1 no change since last check
Trust Flow (Majestic)	4	0
Citation Flow (Majestic)	26	4
Referring domains (Majestic)	135	1

5 details filled in for both companies.

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