Five free, privacy-first developer utilities to help developers, designers, freelancers, founders and students build better web applications with zero friction.
Select a utility below to use it instantly without registration, API keys, or subscriptions.
Simulate real-time Google search snippet display on desktop and mobile. Inspect title and description lengths, prevent character cutoffs, and generate clean HTML meta tags.
Calculate sRGB relative luminance and contrast ratios under the W3C WCAG 2.1 specification. Verify AA and AAA compliance for body text, large headings, and UI controls.
Design modern multi-stop linear/radial CSS gradients, layered box shadows, and smooth border radii with interactive sliders and instant visual feedback.
Format, beautify and validate JSON payloads with configurable 2-space, 4-space, tab or minified indentation. Provides exact line/column syntax error diagnostics.
Preview how your links appear when shared across Facebook, LinkedIn, X (Twitter), Slack and WhatsApp. Generate standard OpenGraph and Twitter card meta tags.
In addition to interactive browser tools, Zelvori curates free open-source libraries, UI kits, motion frameworks, learning guides, and our browser-based architectural prompt generator.
Browser tools provide fast answers for discrete styling, SEO tags and JSON payloads. When your product reaches operational scale—requiring microservice APIs, PostgreSQL RLS databases, bespoke ERP workflows, automated payment reconciliations or full security audits—Zelvori partners with your team from discovery to deployment.