Developer Tools vs Zeplin

devtools.tr is a free toolbox of 173 web and developer tools for webmasters, developers and system administrators. Every check runs live against real servers: DNS lookup, SSL/TLS and security headers, website analyzer with PDF reports, SEO and Core Web Vitals, TTFB, CDN and compression tests, IP geolocation, WHOIS, ASN and blacklist checks. Developer utilities include a JSON formatter and validator, regex tester, Base64, UUID, SQL/HTML/CSS/JS formatters and minifiers. Results come as clear reports with scores and ready-to-paste fixes for Apache, nginx and Cloudflare. No sign-up, no limits, fully in English and Turkish, and works on mobile.

Zeplin is a design delivery platform founded in Istanbul by a Turkish team and now headquartered in San Francisco. It pioneered design hand-off: designers publish finalized screens from Figma, Sketch or Adobe XD, and developers get a stable, organized source of truth that is separate from the messy working files where designs keep changing.

Published screens come with measurements, colors, typography, exportable assets, code snippets and design tokens, and they can be grouped into sections, connected into user flows and annotated with notes. Version history shows what changed between iterations, and workflow statuses mark screens as ready for development. Styleguides document colors, text styles, spacing and components, and integrations with Storybook, Jira, Slack and Connected Components link design elements to real code. Pricing starts with a free plan for one project, a Basic plan priced per project with unlimited users, an Advanced plan priced per seat with 50 projects, and Enterprise for security and support needs.

Zeplin fits product teams that want a curated, approved layer between design and engineering, agencies handing designs to client developers, and organizations using several design tools. Figma's Dev Mode now covers much of the same ground inside Figma, so teams fully on Figma often do not need a separate tool. Supernova and zeroheight are stronger for full design system documentation, while Storybook remains the reference for coded components.