No-Code App Development

Simple in-browser notepad with auto-save. Write quick notes that persist in your browser. Download as text file. No signup needed.

Model an hourly revenue floor from owner pay, overhead, a user-entered annual reserve, billable capacity, and target operating margin.

Calculate the theoretical break-even point and minimum whole sellable units, plus target-profit volume, contribution margin, and signed margin of safety.

Calculate gross profit and operating profit or loss from net revenue, cost of sales, and operating expenses for one consistent period.

Allocate the 168 hours in a seven-day week across work, commute, rest, care and other activities, then save observed and proposed schedules.

Live Markdown editor with real-time HTML preview. Supports headings, bold, italic, links, code blocks, tables, and blockquotes.

Plan remaining drafting work from your editorial word target, current count and measured writing pace, with no invented SEO length requirement.

Compare two opaque sRGB colors using WCAG text contrast ratios. See precise ratio estimates, unrounded threshold decisions and clear invalid-color feedback.

Parse HTTP header blocks into ordered JSON with duplicate fields intact, default sensitive-value redaction, line errors and protocol-review warnings.

Model the standard Schedule SE Social Security and Medicare components from explicit current factor, wage-base, wage, and rate inputs.

Apply entered in-network deductible, coinsurance, copays, and out-of-pocket maximum terms to an entered allowed-charge scenario, plus premiums.