About us

Herramientapp is an independent project offering free online tools and practical guides on taxes, contracts and productivity, with a focus on Spain.

What we do

We build calculators, simulators, document generators and guides that solve everyday tasks: working out a net salary, estimating self-employed contributions, generating a rental contract or creating a QR code. Every tool is free, requires no sign-up and, wherever possible, processes your data directly in your browser.

How we create our content

All content is produced and maintained by the Herramientapp Team, following a fixed methodology:

• Official sources: our tax and legal guides are based on legislation published in the Spanish Official Gazette (BOE) and on information from bodies such as the Spanish Tax Agency, Social Security and the European Central Bank. Each article links to the sources it uses.
• Regular reviews: content with yearly figures (income tax brackets, RETA contributions, VAT rates) is reviewed whenever regulations change, and the update date is shown.
• Transparent calculations: our simulators show the formulas and assumptions they apply, so you can verify every result.

What we are not

Herramientapp provides information and tools for guidance purposes only. We are not a law firm or a tax advisory service, and our content does not replace advice from a qualified professional. For decisions with significant legal or financial impact, always consult an advisor.

Contact

Spotted an error or outdated figure, or want to suggest a tool? Write to contacto@herramientapp.com and we will get back to you as soon as possible.

You can also read our legal notice and our privacy policy.