Hand-built calculators and converters for everyday questions. All your data stays on your device.
Calculate your Body Mass Index in metric or imperial units, with category interpretation.
Convert between metric and imperial length units instantly. Includes mm, cm, m, km, inches, feet, yards, and miles.
Calculate exact age in years, months, days, weeks, and hours from any birth date to any target date.
Three percentage calculators in one: 'X% of Y', 'X is what % of Y', and percentage change between two values.
Calculate tip and split a restaurant bill across any number of people. Quick presets for common tip percentages.
Convert between Celsius, Fahrenheit, Kelvin, and Rankine. All four scales update at once.
Generate strong random passwords using your browser's secure crypto API. Configurable length, character sets, and ambiguity filter.
Count words, characters, sentences, paragraphs, plus estimated reading and speaking time. Handles CJK languages correctly.
Live countdown to any future date and time. Updates every second; works for events, deadlines, launches, vacations.
A reusable prompt for Claude/ChatGPT/Cursor that turns the model into a senior reviewer focused on correctness, performance, and edge cases — not nitpicks.
Rewrite any email draft to be clearer and shorter without losing the message. Pick a tone (warm / neutral / firm) and a length target.
Generate a tight, search-friendly outline for a blog post: H2/H3 hierarchy, intent per section, target word counts, and the questions each section answers.
A modular Midjourney prompt template for portraits with explicit control over subject, framing, lighting, lens, mood, and style. Avoids the generic 'AI portrait' look.
Turn long PDFs, papers, or reports into a structured summary that distinguishes claims from evidence, surfaces contradictions, and quotes source pages so you can verify.
Generate a sharp meeting agenda from rough notes, including time budget, decisions to be made, and a 'should this be async' check at the top.
Generate 6 distinct ad copy variants for the same offer — different persuasive angles (problem, outcome, identity, social proof, scarcity, comparison), each in three ad-platform-ready lengths.
Generate a 30-minute user interview script with open questions, follow-ups for each, and strict no-leading rules. Modeled on Mom Test principles.