Facts & figures
Every figure on this page is generated from the KSeF Guard rule registry and the latest KSeF conformance test. It is the canonical reference for what the product checks and how it was verified.
Last verified: · conformance conformance-v9
Overview
- Active validation rules
- 128
- FA(3) schema
- CRWDE 13775 · 2023-06-29
- Languages
- Polish (primary) + English, legal citations on every finding
Validation rules by classification
- Government-mandated
- 71
- Best practice
- 25
- Inferred
- 13
- Heuristic
- 12
- Security
- 6
- Batch consistency
- 1
Rules by severity
- Error (fails validation)
- 99
- Warning
- 29
KSeF API enforcement
- Enforced by the KSeF API
- 21
- Enforced only by KSeF Guard
- 100
- Structural / XSD-level
- 7
Beyond what KSeF enforces
- Rules beyond KSeF (total)
- 107
- Confirmed via KSeF Test API (rules)
- 95
- Verified off-API (rules)
- 12
- Legal requirements — VAT Act (rules)
- 55
- Best-practice & security (rules)
- 52
Conformance evidence (KSeF Test API)
- Invoices tested
- 256
- Matched KSeF (invoices)
- 148
- Stricter than KSeF — KSeF accepted (invoices)
- 98
- False negatives — passed but KSeF rejected
- 0
- Expected divergences (by design)
- 10
- KSeF API version
- 2.3.0
- Tested on
- 2026-05-25
0 false negatives is the key safety property: across 256 tested invoices, KSeF Guard never approved an invoice the KSeF API rejected.
Privacy & security
- Invoice validation
- 100% offline — no invoice data leaves the device
- Analytics, tracking, cookies
- None
- Offline license grace period
- 7 days
Platforms & output
- Desktop GUI
- Windows 10+ (~30 MB), MSI or portable ZIP
- CLI
- Windows + Linux, single binary, zero dependencies
- Export formats
- Text, Summary (Free); CSV, JSON, PDF (Standard+); white-label PDF (Pro)
Pricing
- Free — €0
- 10 files/day · GUI + Smart Hints + CLI · 1 machine
- Standard — €39/mo (€384/yr)
- 5,000 files/day · CSV/JSON/PDF · rule config · 3 machines
- Pro — €89/mo (€864/yr)
- Unlimited files · white-label PDF · presets · YAML · 10 machines
Billed in EUR by the Merchant of Record (VAT applied by location). Any PLN shown is an estimate (~4.41 PLN/EUR); the final charge is set by the payment processor at checkout.
These numbers are generated from the rule registry and conformance results. If any other page or external source differs, this page is authoritative.