Hardware & Peripherals
Polling Rate Reality Check: How to Measure Your Mouse Hz Locally Before You Trust That 8000Hz Claim
Measure your mouse's actual polling rate locally in the browser before you buy based on an 8000Hz marketing claim.
Blog
Guides, buying advice, and tool deep-dives from the CapyToolkit team.
Developer Tools
Debugging and Exploring Parquet Files with Local SQL Queries
Query and debug Parquet files locally with SQL, inspect schemas, validate data, catch errors before they reach production.
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Developer Tools
Finding the Correct MIME Type for Any File Before You Serve or Upload It
Look up the exact MIME type for any file, extension, or keyword, then copy a correct server directive. No upload, no server round-trip.
Developer Tools
Reading HTTP Status Codes Like a Backend Engineer: A Local Reference Guide You Can Use Without a Network
Learn to read HTTP status codes by class, distinguish confusing code pairs, and apply the right codes in API design and six popular frameworks.
Guides & How-Tos
Building Accessible, Contrast-Safe Color Systems in CSS Using OKLCH and WCAG
Learn to build a complete, contrast-safe color system in the browser with OKLCH and WCAG 2.1, from base color to CSS and Tailwind v4 tokens.
Guides & How-Tos
Letterboxing and Aspect Ratio Math for Video and Photo Crops
Predict letterbox and pillarbox bar sizes before export, choose the right delivery ratio per platform, and verify dimensions with a client-side calculator.
Buying Guides
What to Look for When Buying a Webcam, and How to Test It Before You Commit
Which webcam specs predict video-call quality, which are marketing filler, and how to test any webcam in your browser before the return window closes.
Developer Tools
What Happens to Your Prompt When You Use an Online Token Counter
Your prompt travels to a server you don't control before you get a token count. Here's what that means and how to count tokens locally across 37 AI models.
Buying Guides
How to Shop for a Microphone: Specs That Matter, Specs That Don't, and How to Verify Before You Buy
Which microphone specs actually matter, which ones are marketing filler, and how to test any mic in your browser before you buy.
Security & Privacy
What Password Entropy Actually Means and Why Your Passwords Are Weaker Than You Think
How Shannon entropy and zxcvbn pattern analysis expose the gap between perceived password strength and actual crack resistance.
Guides & How-Tos
Build CSS Gradients Visually Without Sending Design Data to a Server
Build linear, radial, and conic CSS gradients in your browser. Learn color stop control, OKLCH interpolation, angle coordinates, and multi-format output.
Security & Privacy
Percent-Encoding Rules Every API Developer Should Know, and When to Apply Them
Percent-encoding rules for API developers: which characters need escaping, when to use encodeURIComponent, and how to fix unencoded-request failures.
Guides & How-Tos
Network Diagnostics Without Cloud APIs: Subnet Planning, P2P Testing, and URL Inspection
Use browser tools to plan subnets, test P2P latency, and inspect URLs for tracking tokens. No uploads, no cloud, no sign-up.