Credits & Attribution

OneTool is operated by Apala LLC. It relies on public data sources and open-source libraries. This page lists the attributions we want to keep visible. Tool-specific pages may also cite sources inline.

• Frankfurter API / European Central Bank

  Currency converter exchange rates are sourced via the Frankfurter API, which redistributes European Central Bank (ECB) reference rates. Rates are informational reference values, not bank or trading quotes.

  FrankfurterECB reference rates

• IRS Revenue Procedure 2025-32

  US federal income tax brackets and standard deduction amounts used in the tax estimator for tax year 2026 are taken from IRS Rev. Proc. 2025-32. Secondary summaries (for example Tax Foundation explainers) may be used for cross-check only; the IRS publication is authoritative for the numbers we ship.

  Rev. Proc. 2025-32 (PDF)Tax Foundation

• qrcode (npm)

  QR Code Generator uses the qrcode library to render codes in the browser.

  License: MIT License

  qrcode on npm

• js-yaml (npm)

  YAML ↔ JSON conversion uses js-yaml.

  License: MIT License

  js-yaml on npm

• JSZip (npm)

  Favicon package download uses JSZip.

  License: MIT License

  JSZip on npm

• Fuse.js (npm)

  Sitewide tool search uses Fuse.js for client-side fuzzy matching.

  License: Apache License 2.0

  Fuse.js on npm

• Fonts (Google Fonts via next/font)

  UI typography uses Fraunces, Source Sans 3, and JetBrains Mono, loaded through Next.js font optimization.

  License: SIL Open Font License 1.1 (typical for these families)

  Google Fonts

• Next.js / React

  The site is built with Next.js and React.

  License: MIT License

  Next.jsReact

See also Privacy and Terms.