Small developer tools for checking website releases and preparing web assets. Each beta has a defined input, an inspectable output and documented limits.

• Check an SEO change before release: Release Sentinel  compares supplied before-and-after HTTP/HTML snapshots. Review new regressions, persistent findings and missing evidence. It does not crawl your site or verify search rankings. Try the synthetic noindex example .
• Prepare responsive image files: Responsive Image Pack Builder  makes WebP/JPEG variants, a ZIP, a manifest and relative srcset snippets from supported supplied images. You host the exported files. Inspect the synthetic image example .
• Review a PWA manifest and icons: PWA Icon and Manifest Preflight  checks supplied manifest JSON and icon bytes, returning diagnostics and visual previews. Human review and browser installation testing remain necessary.

Read the selected tool's input guide, limits and current pricing before running it. A successful run means processing completed, not that a website passed every release check. Use synthetic examples to understand the output, then supply only data you are authorized to process, with secrets and unnecessary personal data removed.