All 24 tools

Count the business days between two dates for a country or subdivision, and list the public holidays skipped.

Return the date that is N business days after (or before, with a negative N) a start date, for a country or subdivision.

Say whether a date is a business day in a country or subdivision, and why not if it is not.

List the public holidays of one year for a country or subdivision. With region "list", return every supported region code.

Evaluate an arithmetic expression exactly, with no floating-point error, and return the result as a decimal string.

Convert a value between units of length, mass, volume, area, speed, time, data, energy, power, pressure or temperature, using exact definitions.

Convert an amount between currencies at the euro reference rates of the European Central Bank, for today or a date in the last 90 days.

Compute loan payments, amortisation schedules, future and present values, NPV and IRR with exact arithmetic.

Turn broken or wrapped JSON (typical language-model output) into valid JSON, list every repair, and optionally coerce and validate it against a JSON Schema.

Check a JSON value against a JSON Schema and return every error with its path. Does not change the data (use repair-json for that).

Convert a PDF, Word (.docx), Excel (.xlsx), PowerPoint (.pptx), CSV, HTML or text file into clean Markdown, plain text, CSV or structured JSON that a language model can read.

Generate realistic fake records for software tests and demos: people, companies, addresses, invoices, bank transactions, products or orders, for one country.

Generate fake records that match your JSON Schema, with realistic values chosen from field names (name, email, iban, city, price, created_at …) and formats.

Check the format and check digits of a business identifier, and return it normalised: IBAN (with QR-IBAN detection), Swiss company number UID (CHE-…), EU VAT number, LEI, ISIN, GTIN/EAN, Swiss QR reference, RF creditor reference.

Build the Swiss QR-bill code for a payment: validates every field against the Swiss Payment Standards (version 2.3), returns the QR payload text and the QR code as SVG (46 × 46 mm, with the Swiss cross), ready to place on an invoice.

Read the text of a Swiss QR-bill code (as decoded from the QR image) and list every problem against the Swiss Payment Standards, with the parsed fields.

Validate a cron expression, describe it in plain English, and list its next run times in a time zone, with daylight-saving changes handled.

Convert a date and time from one time zone to one or more others, with UTC offsets and daylight-saving status. Detects local times that do not exist (spring forward) or happen twice (fall back).

Convert a date to its ISO 8601 week (year, week, weekday) with the Monday and Sunday of that week, or a week to its dates.

Estimate the CEFR reading level (A1–C2) of a text, with separate levels for vocabulary, grammar and sentence structure, the reasons, and the words above the overall level.

Rewrite a text so a learner at a given CEFR level (A1–C2) can read it, in the same language, keeping the facts and the order of ideas. Lists the main changes.

Generate a Sudoku with exactly one solution, or solve and grade a given grid.

Make a word-search grid from your words, with the answer key. Every word appears exactly once, also after the random fill.

Run one of 30 exact everyday calculators: home and DIY, garden, kitchen, car, energy, everyday numbers.