Developer Tools
Developer tools and calculators for networking, text encoding, color conversion, hashing, regex testing, and system administration.
Luhn Algorithm Validator
Validate any credit card, IMEI, or ID number using the Luhn algorithm checksum. Identifies Visa, Mastercard, American Express, Discover, and Diners Club.
SHA-256 / MD5 Hash Generator
Generate MD5, SHA-1, SHA-256, and SHA-512 cryptographic hashes of any text. Useful for data integrity verification, checksums, and security analysis.
AI API Token Cost Calculator
Estimate AI API costs from token count and model selection. Compare GPT-4o, Claude, and Gemini pricing across OpenAI, Anthropic, and Google platforms.
API Rate Limit Calculator
Calculate API usage against rate limits to determine if your call volume fits within plan limits, and how to optimize request scheduling.
Server Downtime Cost Calculator
Calculate server downtime cost from hourly revenue, lost conversions, and support overhead. Returns cost per incident and annual risk exposure for SLA planning.
Bitwise Operations Calculator
Perform bitwise AND, OR, XOR, NOT, left shift, and right shift on integers. See results in binary, decimal, hexadecimal, and octal with step-by-step breakdown.
Text to Hexadecimal Converter
Convert text (ASCII/UTF-8) to hexadecimal and back. Also shows binary, decimal, and octal representations of each character with full code point table.
IP Subnet Calculator
Calculate subnet mask, network address, broadcast address, and host range from any IP address and CIDR notation. Essential for network administrators.