Dev Tools

Free financial calculators and simulators for DIY investors. No registration, no data collection, no hidden costs. All tools run entirely in your browser: your financial data never leaves your device.

JSON To Openapi

Generate OpenAPI 3.

SQL To Typescript

Convert CREATE TABLE DDL into TypeScript interfaces.

CSV To Financial JSON

Normalize broker CSV exports into JSON arrays.

API Mock Generator

Generate mock fintech API rows from JSON schemas.

YAML JSON Portfolio

Parse portfolio YAML configs into validated JSON.

Regex Transaction Parser

Build regex patterns to categorize bank transactions.