Tools
Coding Challenges
Practice timed coding problems by language with hints and test cases.
Open Coding ChallengesPlaywright/Cypress Test Builder
Generate Playwright and Cypress test files with a visual builder. Preview and edit before downloading.
Open Test BuilderDate & Time Difference
Calculate date differences or convert seconds to a human-readable format.
Open Date & Time DifferenceJulian Date Converter
Convert dates to and from the Julian date format (yyddd).
Open Julian Date ConverterTime Zone Converter
Convert times, manage DST, and view a world clock with current times in cities worldwide.
Open Time Zone ConverterBase64 Encoder/Decoder
Automatically encode/decode Base64 strings as you type.
Open Base64 Encoder/DecoderEscape/Unescape
Escape and unescape strings for HTML, XML, JavaScript, JSON, and more.
Open Escape/Unescapecurl to code
Convert curl commands into code snippets for JS, TS, Python, Go, Java, and more.
Open curl to codeCSS and SCSS Converter
Convert CSS to SCSS and SCSS to CSS with nesting and variables.
Open CSS and SCSS ConverterGrammar & Spelling Checker
Check and correct grammar and spelling errors in your text with inline highlighting.
Open CheckerSoftware Tools
Financial Tools
(Disclaimer: Financial tools may be imperfect and are intended for estimates and awareness only — not financial advice or a guarantee of results.)
Compound Interest
Project investment growth with monthly or annual contributions (annual compounding).
Open Calculator