Developer utilities
The small everyday developer tools: test regular expressions, decode cron schedules, convert colors and timestamps, calculate subnets, and look up HTTP status codes and MIME types — each running entirely in your browser.
All 10 tools in Dev Utilities
Regex Tester
Test patterns with live matches
Cron Parser
Explain cron expressions
Color Converter
HEX ↔ RGB ↔ HSL
Unix Timestamp Converter
Epoch ↔ human date
IP Subnet Calculator
CIDR ranges & masks
HTTP Status Codes
Searchable status reference
MIME Type Lookup
Extensions ↔ content types
Sorting Algorithm Visualizer
See how sorts work
Open Source License Picker
Choose the right license
Code Snippet Manager
Save snippets locally