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KSeF Guard vs ksefuj.to
Both validate KSeF invoices. Here's how they compare on depth, privacy, and features — based on publicly available information.
| Feature | KSeF Guard | ksefuj.to |
|---|---|---|
| Privacy & Security | ||
| Data privacy | Validation runs offline — invoice data stays local | Browser-side processing |
| Offline / air-gapped | Yes — validation runs offline. License, payments, updates may connect. | Browser-based, offline after load |
| No telemetry | Verified — no analytics, no tracking | Amplitude + Vercel (anonymized) |
| Validation Depth | ||
| Catches beyond KSeF | 107 rules beyond KSeF (55 legal)↗ | — |
| Validation rules beyond XSD | 128 with source-backed evidence↗ | 44 semantic rules, cites Art. 31a |
| KSeF API conformance tested | 256 invoices, 0 false negatives (conformance v9)↗ | — |
| Legal source provenance | SHA-256 verified quotes from VAT Act↗ | Cites Art. 31a (no full chain) |
| XSD schema validation | Full libxml2 | Yes |
| Smart fix hints | Bilingual problem + fix per rule | XPath + fix hints |
| Workflow & Reporting | ||
| Batch processing | 5,000 files/day (Standard), unlimited (Pro) | Multiple files |
| PDF audit report | White-label PDF with legal chain | No |
| Export formats | TXT, CSV, JSON, PDF | None |
| Rule configuration | Per-rule enable/disable, YAML profiles | No |
| CLI for CI/CD | Exit codes 0–130, JSON output | Yes (npm package) |
| Bilingual interface | Polish + English | Polish, English, Ukrainian |
| Price & Access | ||
| Entry price | Free (10 files/day) | Free |
| Unlimited usage | €89/month (Pro) | N/A |
| Platform | Windows desktop + CLI (Linux CLI) | Web browser |
| Open source | No — SHA-256 verified rule provenance | Apache 2.0 |
| Product status | Available | Released |
✓ yes · ✗ no · — unknown or not tested
Conformance v9 methodology: 256 test invoices submitted to KSeF test API 2.3.0 on 2026-05-25. Results: 0 false negatives, 98 false-positive fixtures (94 active rules, plus 4 from inactive rules). Including 12 additional rules verified by static analysis and batch testing, KSeF Guard validated 107 rules beyond KSeF API, of which 55 are legal requirements.
Comparison based on publicly available information as of May 2026. We strive for accuracy — contact [email protected] if any claim needs correction.