Development
Tools & Analytics
Web performance, hosting ROI, and technical SEO tools. Explore our suite of precision development calculators.
Technical decisions have real financial and performance trade-offs. Calcuva's development tools help you weigh hosting ROI, estimate the cost of AI API tokens, and analyze the metrics that affect web performance and SEO. Each calculator answers a practical engineering question: Is this hosting plan worth it? What will this LLM feature cost at scale? These tools are built for developers, founders and technical marketers who want fast, defensible numbers without building a spreadsheet. They run instantly and privately in your browser. Use them to budget infrastructure, justify a migration, or forecast the cost of shipping an AI feature before you write the first line of code.
Calculate the revenue lift of faster WordPress hosting.
Pretty-print, minify and validate JSON instantly in your browser.
Encode text to Base64 and decode it back, fully UTF-8 safe.
Percent-encode or decode URL strings instantly in your browser.
Test JavaScript regex patterns live with flags, groups and highlights.
Decode any cron schedule into plain English and preview its next runs.
Decode a JWT's header and payload to readable JSON instantly.
Compare two texts line by line and see additions, removals, and unchanged lines.
Generate secure random UUID v4 (GUID) values in bulk.
See your public IPv4 and IPv6 address instantly, plus your browser, OS and timezone.
Instantly check your screen resolution, viewport size, pixel ratio and color depth.
See your browser's full user agent string and a friendly breakdown of browser, OS, device and engine.
Detect your browser name, version, OS and device specs instantly.
Detect your IANA time zone, UTC offset and live local clock instantly.
Detect your screen's aspect ratio from its resolution, reduced by GCD.
Design CSS gradients visually and copy production-ready code.
Design CSS box-shadows visually with live preview and copyable rgba output.
Generate harmonious 5-color palettes from any base color and harmony rule.
Check text/background contrast against WCAG AA & AAA.
Convert colors between HEX, RGB and HSL instantly.
Round each corner with sliders and copy clean border-radius CSS instantly.