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Screen Size Checker vs Kastavo

A side-by-side comparison built from both listings. Blank cells mean the company has not given that detail; we never guess.

Screen Size Checker compared with Kastavo
DetailScreen Size Checker logo Screen Size CheckerKastavo logo Kastavo
What it doesInstant screen resolution and viewport size checker for developers and designers Free online tools to convert files, calculate values, generate codes and transform text in your browser
StageNot given Not given
FoundedNot given Not given
Based inNot given BR
Pricing modelFree Free
PricingNot given Not given
Key features
  • Screen Resolution Detection
  • Viewport Size Measurement
  • Device Pixel Ratio (DPR) Check
  • Operating System Detection
  • Browser Version Information
  • Touch Support Detection
  • User Agent String Display
  • Real-time Screen Analysis
  • Compress and convert images (JPG, WebP, PNG)
  • Merge, split and convert PDF documents
  • QR code generator for text, links, Wi-Fi, Pix, vCard and SMS
  • Word and character counter with real-time processing
  • JWT decoder showing header, payload and expiration
  • Compound interest calculator with monthly contributions
  • Color picker showing HEX, RGB and HSL values
  • Unit converters for length, temperature and more
  • Video compression by selecting resolution and quality
  • Freelance hourly rate calculator for income goals
What makes it different
  • Real-time detection of browser viewport, screen resolution and device specifications without installation
  • Helps developers create responsive websites that look great on all devices
  • Educational resources explaining CSS pixels versus physical measurements
  • Maintained as independent web tool kept fast, readable and useful
  • All tools run entirely in your browser with no file uploads or server processing
  • Fast results with instant processing directly in your browser
  • No sign-up required with no hidden limits or paywalls
  • Available in three languages with localized units and formats
  • Regularly updated catalog with new tools added continuously
Free planNot given Not given
Open sourceNot given Not given
PlatformsNot given Not given
Public APINot given Not given
Community votes00
DR (Domain Rating by Ahrefs)23 no change since last checkNot checked yet no change since last check
Trust Flow (Majestic)50
Citation Flow (Majestic)2521
Referring domains (Majestic)445

4 details filled in for both companies.

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