Open your invoice in the same document you already know — then scrub through time and watch it become the exact document the law will require, field by field, year by year.
🇫🇷France· e-invoicing reformViewing your invoice as of —
sample-france-invoice
✓ Built-in sampleEN 16931 model ready
Drop a UBL / CII XML or Factur-X (PDF/A-3) anywhere — parsed 100% in your browser with the viewer engine, nothing uploaded. No structured invoice? The built-in sample is loaded.
✓
Invoice mechanics checked. EN 16931 structure valid · line totals reconcile.
Layer A · checked
EN 16931 0/164
Rules sourced & dated — curated from the tax authority's own spec, with a last-verified date on every milestone.
Layer B · sourced
What changedLayer B · sourced
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Helios
Helios keeps your invoices compliant automatically.
Every field, format and channel on this timeline, handled for you — so your invoice is never the thing that's late.
Layer A · Mechanics. Fields, formats & the document come from EN 16931 / UBL / CII, rendered by the same engine as the Viewer. Structure and line-total arithmetic are checked in your browser. Full XSD/Schematron validation is the paid service.
Layer B · Mandate rules. Dates, scope & required fields are curated from each tax authority's own specs — every milestone shows its source and last-verified date. Maintained, cite-backed, not legal advice.
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