Developer Tools
Query Local Files with SQL in the Browser Using CapyToolkit's SQL Workbench
Run DuckDB SQL on Parquet, CSV, Excel, JSON, and eight more file formats in your browser. No install, no upload, no server. Just open a tab and query.
Blog
Long-form guides and technical deep-dives for people who like to check things themselves, written from hands-on experience with the tools on this site.
Security & Privacy
Sanitizing Kubernetes and Terraform Manifests Before Committing to Version Control
Scan Kubernetes and Terraform configs for secrets before committing. Detect hardcoded credentials and security smells, and generate sanitized manifests.
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Audio & Acoustics
Choosing Headphones: How to Test Frequency Response, Channel Balance, and Latency Before You Commit
Decode headphone specs, test frequency response, channel balance and latency in your browser, and decide which pair to keep before the return window ends.
Developer Tools
Hash Functions in the Browser: How to Use CapyToolkit's Client-Side Hash Generator for Integrity Checks and HMAC Signatures
How hash functions work, which algorithms are safe in 2026, how HMAC protects webhooks and APIs, and how to run it all locally with CapyToolkit.
Hardware & Peripherals
Gaming Peripheral Specs You Can Verify in the Mouse, Controller, and Webcam
Gaming mice, controllers and webcams ship with lab spec numbers. Learn which specs to choose by and how to verify each one in your browser.
Developer Tools
Base64 Encoding Without the Cloud: What Your Browser Handles Locally
How Base64 encoding works at the byte level, why client-side browser encoding eliminates data exposure, and practical workflows for sensitive data.
Guides & How-Tos
Submitting URLs to Search Engines via IndexNow Without a CMS Plugin
How the IndexNow protocol works, how to push URLs to Bing, Yandex, and other engines from the browser, and how to verify every submission landed.
Hardware & Peripherals
Achieving Perfect Audio-Video Sync in OBS Streams Using CapyToolkit's Webcam A/V Sync & Latency Meter
Measure webcam-to-microphone latency using CapyToolkit's Webcam A/V Sync & Latency Meter. Apply the OBS Audio Offset for perfect A/V sync in your streams.
Developer Tools
Debugging 500 MB+ Application Logs in the Browser Without Uploading
Filter and search gigabyte-scale log files locally in your browser with Web Workers and IndexedDB, zero uploads, no server, no PII exposure on the wire.
Developer Tools
Counting Prompt Tokens Locally Before Sending to GPT, Claude, and Gemini
Count tokens, context usage, and input costs for dozens of AI models in your browser before any prompt reaches an API. Works offline.
Developer Tools
Testing WebRTC Peer-to-Peer Connection Quality Without Cloud Relay Servers
Measure direct browser latency, jitter, and packet loss with zero-cloud WebRTC tools. No servers, no uploads, no TURN relay.
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.
Security & Privacy
A Client-Side Privacy Audit: What Your Browser Leaks and How to Clean It Before Sharing
Audit browser leaks, URL credential exposure, and hidden photo metadata with a client-side workflow. No uploads, no third parties.
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