Developer / Networking
HTTP Status Code Reference
Common HTTP codes, redirect behavior and troubleshooting notes.
Open reference →Free Resources
Useful references to bookmark, share and keep beside your work.
Explore public benchmarks: compare image compression formats, settings and tool outputs →
23 references · Free CSV downloads · Print-friendly pages · Sources included
Developer
HTML Entity Reference
Common HTML named and numeric character references with escaping examples.
Open reference →Developer / Design
CSS Color Reference
All 148 CSS named colors with HEX, RGB and visible swatches.
Open reference →Developer
JSON Syntax Guide
JSON types, syntax errors and safe serialization examples.
Open reference →Developer
Regex Cheat Sheet
JavaScript regex tokens, flags and tested-pattern examples.
Open reference →Developer
MIME Type Reference
Common web extensions and media types for Content-Type headers.
Open reference →Developer
Unix Timestamp Reference
Unix seconds versus milliseconds, UTC conversions and common mistakes.
Open reference →Developer / Networking
HTTP Headers Reference
Request and response headers for caching, compression, redirects and security.
Open reference →Design
Image Size Guide
Pixel dimensions, aspect ratios, print resolution and responsive image sizing.
Open reference →Design
Social Media Image Dimensions
Official profile and banner recommendations for X, YouTube and LinkedIn.
Open reference →Design
Web Image Format Guide
Compare JPEG, PNG, WebP, AVIF, SVG and GIF for web use.
Open reference →Design / Developer
CSS Gradient Library
Copy original linear, radial and conic CSS backgrounds with visual previews.
Open reference →Design
Color Palette Library
Copy five-color starter palettes and adapt them with the palette generator.
Open reference →Networking
IPv4 Subnetting Cheat Sheet
Network, broadcast and host-range calculations with a worked IPv4 example.
Open reference →Networking
CIDR Reference
All IPv4 prefixes from /0 to /32, masks and address counts.
Open reference →Networking
Private IP Address Ranges
RFC 1918 ranges and distinctions from loopback, link-local and shared space.
Open reference →Networking
Common Ports Reference
Common service ports with TCP/UDP distinctions and connection-check notes.
Open reference →Networking
DNS Record Types Reference
Common DNS types, purposes and illustrative values.
Open reference →Academic
Statistical Formula Reference
Descriptive and inferential formulas with symbols and assumptions.
Open reference →Academic
Effect Size Reference
Mean differences, standardized effects and ratios with interpretation caveats.
Open reference →Academic
Confidence Interval Guide
Interpret intervals, choose a method and follow a worked mean example.
Open reference →Academic
Research Methodology Reference
Study designs, bias checks and reporting-guideline links.
Open reference →Academic
APA, DOI and PMID Reference
Reference checks and the differences between citation style and article identifiers.
Open reference →