Precision Engineering, RegTech Compliance & Absolute Privacy
Platform with over 526 tools for Developers, QAs, and Tax Analysts across 71 countries and jurisdictions, featuring 100% client-side execution (zero data sent to servers).
Box4Dev's Three Engineering Domains
Box4Dev is not a generic aggregator. It is structured into three independent pillars of engineering and international compliance:
Official validators and generators with certified algorithms and weights for tax, civil, banking, and vehicular documents across 71 countries and fiscal jurisdictions.
- ✓3D physical card simulation adhering to ISO/IEC 7810 ID-1 standards
- ✓Barcodes and digitable lines for Brazilian FEBRABAN payment slips
- ✓Global banking systems: IBAN, BIC/SWIFT, ABA Routing, CBU
- ✓CNAB Rainbow: interactive visualizer for 150, 240, and 400 layouts
- ✓Algorithms with official Modulo 10, 11, and 97 weights and strict rejection
Strict compliance engines for international e-invoicing standards, tax compliance, and regulatory auditing.
- ✓Peppol BIS Billing 3.0 (UBL 2.1 / EN 16931) with Schematron validation
- ✓Factur-X / ZUGFeRD: Hybrid PDF/A-3 invoices with embedded XML
- ✓ZATCA Phase 1 & 2 official TLV decoder (Saudi Arabia)
- ✓Veri*Factu & TicketBAI (Spain) and KSeF compliance (Poland)
- ✓Brazil: NF-e, NFS-e access keys and new Alphanumeric CNPJ
Technical tools for deep analysis, cryptography, and engineering productivity running on the browser's native Web Crypto API.
- ✓X.509 v3 Inspector (PEM, DER, SANs, fingerprints, ca-bundles)
- ✓Reactive JWT Debugger with HS256/RS256 cryptographic verification
- ✓Multi-Engine Cron Simulator with POSIX and Quartz Scheduler syntax
- ✓JSON-LD Schema.org structured data validator for search engine SEO
- ✓Real-time collaborative Planning Poker via Cloudflare Durable Objects
Our Inviolable Engineering Principles
Four core tenets guiding every line of code deployed across Box4Dev:
Privacy as Architecture (Zero-Knowledge)
Our privacy commitment is not a contractual terms-of-service clause; it is a physical guarantee. Box4Dev has no database for user inputs. Private keys, certificates, and invoices process strictly within the ephemeral RAM of your browser.
Mathematical Rigor & Clean-Room TDD
No code ships to production without official regulatory dossiers and decoupled validation and generation algorithms tested via black-box suites against IETF, ISO, W3C, OpenPeppol, and international tax specifications.
Extreme Edge Performance (< 50ms TTFB)
Pure static site generation (SSG) pre-compiling over 3,000 localized routes distributed across Cloudflare's 300+ data centers. In-memory MiniSearch BM25 engine delivers sub-millisecond query responses.
Native Multilingual Sovereignty
Authentic global support: 5 native languages (English, Portuguese, Spanish, German, French) across 2,185+ static namespaces. Every formula, anatomy diagram, and specification is translated with precision.
Engineering Beyond the Browser: CI/CD & IDEs
Box4Dev was designed to eliminate friction throughout the entire engineering lifecycle — from the web interface to automated test pipelines and code editors.
Official NPM Packages
Decoupled libraries with native TypeScript and zero dependencies (@box4dev/validador-br, @box4dev/gerador-br, @box4dev/gerador-boleto) for execution in Node.js, Jest, Playwright, and Cypress pipelines.
IDE & Browser Extensions
Dedicated extensions for Visual Studio Code (Live API Monitor, API Test Builder) and Google Chrome for fast inspection, autofill, and testing.
Architecture & Technical Transparency
Engineering decisions engineered for static immutability, client-side data isolation, and 0ms latency.
Ready to elevate your testing precision?
Explore over 526 tools across 71 countries or integrate our official packages directly into your projects and CI/CD pipelines.