About screenres.app

A privacy-first screen diagnostic tool built by display technology enthusiasts for developers, designers, and power users.

20+

Diagnostic Tools

Data Collected

First-Party Cookies

Local

Client-Side

My Mission

screenres.app was born from a simple frustration: every screen resolution checker on the web was either plastered with ads, harvesting user data, or lacking the advanced features developers actually need.

I set out to build the most comprehensive, most beautiful, and most private screen diagnostic tool on the internet. High performance, no first-party tracking, no compromises.

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Privacy First

Zero first-party cookies. All calculations occur in your browser; no data is sent externally.

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Instant Results

No loading spinners, no server calls. Every metric is computed in real-time using native browser APIs.

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Developer-Grade

PPI calculators, CSS media query generators, responsive sandboxes — tools pros actually use.

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Beautifully Designed

Clean dark-mode interface that respects your eyes and sets the standard for utility design.

About Me

Jawad Hassan

Tool Builder & Display Researcher

I build free web tools that solve specific, everyday problems. I built screenres.app out of frustration with ad-heavy, privacy-invasive resolution checkers — creating a tool that developers and designers can actually rely on. My focus is making display diagnostics accurate, fast, and local to the browser.

View Author Profile

Editorial Policy & Technical Accuracy

I am committed to providing developers, designers, and display buyers with the most precise, up-to-date, and technically rigorous information about display specifications and diagnostic procedures. Every resolution comparison, guide, and calculator on this site adheres to the following editorial standards:

Technical Precision: All technical articles and metrics are vetted against the latest W3C, MDN, and manufacturer documentation. I don't rely on automated SEO scraping; every specification in the device database is verified by me against published specs.
Rigorous Testing: Diagnostic recommendations are based on actual physical device performance testing, screen color calibration, and pixel diagnostics.
Ethical Disclosures: screenres.app is supported by non-intrusive advertisements. I never accept payment for product recommendations, and all resources are completely free to use.

Testing Devices & Infrastructure

To guarantee that the screen checkers, resolution tests, and viewport diagnostics render correctly across all platforms, I test the code against a dedicated physical hardware matrix. I don't rely solely on browser emulators:

macOS & Apple Ecosystem: MacBook Pro M3 Max (14-inch Liquid Retina XDR, scaling tested at 1x, 2x), iPad Pro 11" (M2), iPhone 15 Pro Max (Super Retina XDR, Dynamic Island viewport testing).
Windows & PC Ecosystem: Custom PC running Windows 11 with multi-monitor setups (Dell UltraSharp U2723QE 4K IPS, ASUS ROG Swift PG279Q 144Hz IPS gaming monitor, and a legacy 1080p TN panel). I test multi-display scaling and refresh rate overrides.
Android Ecosystem: Samsung Galaxy S23 Ultra (WQHD+ Dynamic AMOLED 2X, 120Hz) and Google Pixel 7a (FHD+ OLED, 90Hz) running Chrome and Firefox Mobile.
Browsers Tested: Google Chrome (Stable/Canary), Mozilla Firefox, Apple Safari (Desktop & iOS), Microsoft Edge, and Opera.

Corrections & Bug Reports Policy

I strive for perfect accuracy. If a screen metric, aspect ratio calculation, or diagnostic result is incorrect on your display configuration, please report it:

I review all bug reports within 48 hours.
Corrections to guide articles are logged in the changelog (see below).
You can submit diagnostic logs directly via the contact page or email hello@screenres.app.

Changelog & Update Log

I actively maintain screenres.app to keep pace with new web standards and display technologies:

📅 June 2026: Added "How accurate is this?" transparency module to all 12 diagnostic tools, surfacing real browser API limitations at point of use. Added methodology link beside every tool. Updated author profile with real name, photo, and first-person bio.
📅 June 2026: Launched device database, homepage, display tools index, QA screen resolution checker, and contact page. Added JSON-LD structured data across all pages.
📅 May–June 2026: Initial launch. Built 12 browser-based diagnostic tools (dead pixel, backlight bleed, ghosting, DPR checker, viewport checker, PPI calculator, online ruler, reaction time, screen resolution test, screen size calculator, black screen, white screen). Published methodology, editorial policy, privacy, and tool accuracy pages.

Technical Foundation

screenres.app is built with performance and transparency in mind. Runs client-side and is designed to work without external dependencies.

Astro SSG React Islands Screen API Window Management API CSS Custom Properties JSON-LD Schema

Sources & References

All diagnostic data is sourced from W3C/WHATWG specs:

MDN: Screen API — Resolution detection
MDN: devicePixelRatio — DPR measurement
W3C: Window Management API — Multi-screen
W3C: CSS Values and Units — Reference pixel

Contact

Email: hello@screenres.app — I respond within 48 hours.