Currency Exchange Calculator

Coding & Technical Cursor/Windsurf Intermediate

Develop a comprehensive currency converter using HTML5, CSS3, JavaScript and a reliable Exchange Rate API. Create a clean, intuitive interface with prominent input fields and currency selectors. Imple...

Develop a comprehensive currency converter using HTML5, CSS3, JavaScript and a reliable Exchange Rate API. Create a clean, intuitive interface with prominent input fields and currency selectors. Implement real-time exchange rates with timestamp indicators showing data freshness. Support 170+ global currencies including crypto with appropriate symbols and formatting. Maintain a conversion history log with timestamps and rate information. Allow users to bookmark favorite currency pairs for quick access. Generate interactive historical rate charts with customizable date ranges. Implement offline functionality using cached exchange rates with clear staleness indicators. Add a built-in calculator for complex conversions and arithmetic operations. Create rate alerts for target exchange rates with optional notifications. Include side-by-side comparison of different provider rates when available. Support printing and exporting conversion results in multiple formats (PDF, CSV, JSON).

Copy the block above straight into your AI tool — anything in [BRACKETS] is yours to fill in.

Want it tuned to your business? Bring it to the free weekly call and we'll adapt it live.

Join the free call

More coding & technical prompts

Keep a Two-Minute Daily Engineering Log That Pays Off Later

Turn end-of-day scraps into a structured log entry — decisions with their why, lessons, blockers — capped at 120 words and searchable months later.

Break a Stalled Decision With a Structured Tiebreak

Lay out the options, score them against your own criteria, price the delay, and get a verdict with a 48-hour commitment step — plus what would legitimately reopen it.

Engineer a Distraction-Proof Deep-Work Block

Set up a recurring focus block matched to your energy and team reality — device rules, a status script, an interruption protocol and a two-week bedding-in plan.