Designer Tools for Android

Quick overview

Designer Tools is a free Android utility that helps designers and developers validate app layouts and visual specs. It bundles several inspection utilities — overlays, grids, and a pixel-level color sampler — to make it easier to compare a live build with design mockups and catch spacing or alignment issues.

Major capabilities

• Pixel-accurate color sampling: a magnifier loupe lets you pick colors at the pixel level and returns hex values.
• Mockup overlay comparisons: place a design image over the running app, switch between portrait and landscape, and adjust opacity for side-by-side validation.
• Grid and keyline overlays: turn on-screen grids to inspect spacing, change grid cell size, and customize line and keyline colors.
• Layout checks: tools to highlight inconsistent spacing or elements that are misaligned with the spec.

Overlay and grid controls

• Choose between landscape and portrait mockup layers and tweak transparency to reveal mismatches clearly.
• Toggle an on-screen grid quickly and tailor its density and color settings to match the design system.
• Use keylines to verify alignment against visual guidelines and to spot off-by-one spacing problems.

Color sampling details

• The color picker uses a movable loupe for precise selection; it reports hex codes and makes it simple to confirm that implemented colors match the spec.
• Because sampling is pixel-based, it’s useful for catching subtle color shifts caused by compression, rendering, or theme overrides.

Accessibility usage and privacy

Designer Tools uses the AccessibilityService API so it can display a floating popup and operate while you multitask. The developer states that the AccessibilityService is not used to collect or transmit personal data.

Suggested alternative

Sanatan App Lite — Free

• Lightweight substitute for quick overlay and inspection needs, suitable when you want a more minimal toolset.
• Recommended when you need a simpler UI or a smaller install footprint while still performing basic mockup and grid checks.

Bottom line

If you need a compact Android app to verify visual fidelity between designs and an implemented interface, Designer Tools delivers a focused set of inspection utilities. It’s particularly useful for catching spacing and alignment errors, comparing mockups directly over the app, and extracting exact color hex values.