About DevPane

What is DevPane?

DevPane is a suite of six developer utilities designed to solve common problems quickly and elegantly. Every tool runs entirely in your browser, with no servers collecting your data, no signup walls, and no artificial limits. Whether you need to decode a JWT, convert a Unix timestamp, or analyze a domain's DNS records, DevPane gives you the answer in seconds.

Each tool is meticulously designed to do one thing exceptionally well. We believe developer tools should be fast, transparent, and respectful of your privacy. That means client-side execution wherever possible, clean interfaces without clutter, and thoughtful features like URL state sharing, keyboard shortcuts, and dark mode by default.

DevPane is also a demonstration of quality over quantity. Rather than building 50 mediocre utilities, we focus on six carefully crafted tools that developers actually use daily. Each tool includes educational content, real-world examples, and best practices guides to help you understand not just how to use the tool, but why certain patterns and standards exist in the first place.

The Tools

• Epoch Converter

  Convert Unix timestamps to human-readable dates and vice versa, with timezone support and millisecond precision.

• Cron Builder

  Visual cron expression builder with natural language descriptions and support for AWS EventBridge syntax.

• JSON Formatter

  Format, validate, and beautify JSON data with syntax highlighting, error detection, and schema validation.

• JWT Decoder

  Decode and inspect JSON Web Tokens with security analysis and algorithm verification, entirely client-side.

• Subnet Calculator

  Calculate network ranges, subnet masks, and CIDR notation for IP address planning and AWS VPC design.

• Domain Checker

  Comprehensive domain intelligence including DNS records, SSL certificates, security headers, and email authentication configuration.

Built by Bluminal Labs

DevPane is built and maintained by Bluminal Labs, a software consultancy focused on developer tools, technical infrastructure, and web performance optimization.

A.J. Brown, Principal Engineer — With over 20 years of experience building production systems, developer tooling, and high-traffic web applications, A.J. created DevPane to solve the kinds of problems he encounters daily. Each tool reflects a belief that utilities should be fast, accurate, and transparent about what they do with your data.

Our Philosophy

• Privacy by default: Most tools run 100% in your browser. Your data never leaves your machine.
• Performance matters: Instant feedback, no loading spinners, no artificial delays.
• Education over automation: Every tool includes guides explaining the underlying concepts and best practices.
• Open and honest: We show our work. Source code, reasoning, and limitations are documented clearly.
• No dark patterns: No signup walls, no artificial feature locks, no misleading language. The site is supported by ethical advertising, not user tracking.

Get in Touch

Have feedback, questions, or partnership inquiries? Reach out at hello@bluminal.com.