haz.tools — 100+ free Spanish online tools (calculators, validators, generators)
A privacy-first directory of online tools tailored for Spanish-speaking users. Mortgage calculator with proper French amortization. Self-employed tax calculator with 2026 brackets (RDL 16/2025). Validators for Spanish (DNI/NIE/CIF) and Iberoamerican (RFC, RUT, RUC, NIT, CUIT) IDs. IBAN validator for SEPA. Password and UUID generators using Web Crypto API. Currency converter with ECB rates.
