LT Browser

Custom viewports, multi-device testing, and performance reports for mobile sites
4.9 
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Skip the guesswork and run your site against the screens that actually matter. Open LT Browser, create a preset with exact width and height, name it for quick recall, and save it. Build a library of profiles for phones, tablets, and desktop displays so every check starts from a known baseline. Paste your URL, pick a profile, and see the page render at that size. Switching views is instant, letting you validate changes as you code. Keep separate collections for each client or product line to move between requirements without reconfiguring.

For day‑to‑day responsive checks, walk through your preset lineup with a clear checklist. Confirm navigation behavior on tight widths, ensure hero media crops as intended, validate grid and typography shifts at key breakpoints, and test forms for usability on mid-range dimensions. Add presets for edge cases—compact tablets, small laptops, or dense screens—so you don’t miss real‑world scenarios. When you spot a layout issue, log the preset name and resolution in your ticket for precise fixes. Re-run the same sequence after CSS updates to be sure media queries still hold and nothing regresses.

When performance matters, run the built-in audit to capture essential signals across your preset set. The report highlights load, render, and interaction indicators so you can prioritize high‑impact optimizations. Trim images, defer scripts, or reduce layout shifts, then re-run the audit to confirm gains at each size. Track reports by sprint to visualize trends and use the numbers to define go‑live thresholds. Because the measurements are consistent across profiles, you can compare results confidently without guesswork.

Turn this into a repeatable team workflow. Standardize the preset library, agree on a testing order, and attach the latest report to pull requests or staging sign‑offs. For content updates, editors can preview articles and landing pages in the same saved profiles to confirm copy length and media fit before publishing. QA can focus on edge resolutions while developers iterate on core breakpoints. With LT Browser as the shared environment for device sizes, resolution coverage, and performance reporting, fewer issues slip through and less time is spent recreating test conditions.

Review Summary

Features

  • Build and save custom viewport profiles
  • Test across phone, tablet, and desktop dimensions
  • Resolution coverage checks for uncommon sizes
  • Performance audits with actionable reports
  • Reusable device collections per project
  • Streamlined, repeatable testing workflow

How It’s Used

  • Front-end developers validating responsive layouts
  • Designers reviewing component behavior at breakpoints
  • QA engineers reproducing device-specific bugs
  • Content editors verifying copy and media fit on small screens
  • Product teams defining launch performance thresholds
  • Agencies maintaining client-specific device libraries

Plans & Pricing

Lite

Free

Unlimited testing on all 50+ device viewports and unlimited custom viewports Take full page screenshots and share them with your team One-click Google Lighthouse Performance report Side-by-side multiview port testing with sync scroll In-built debugging tools Network throttling on 2G, 3G, and 4G Javascript error report for webpage debugging

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4.9
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