SEO Validator is a simple tool for validating SEO metrics. It returns a structured breakdown of on-page SEO checks, a list of issues to fix, and a composite 0-100 SEO score with a letter grade for the web page.

Shoe Size Converter is a tool for converting shoe sizes between US, UK, EU, CM, JP, AU, MX, and KR standards. It supports men, women, unisex, and child sizes.

Short Code Generator is a tool for generating short alphanumeric codes. It supports multiple character sets including alphanumeric, alphabetic, numeric, hexadecimal, and Base58 with customizable length.

Silver Price is a simple tool for getting the current price of silver. It returns the current price of silver in any currency and in various units.

Sitemap Generator creates valid XML sitemaps from URL lists following the sitemaps.org protocol for search engine optimization.

Slot Machine Simulator is a tool for simulating slot machine spins with realistic reel symbols and payout calculations. It supports customizable number of reels, bet amounts, and multiple spins with detailed win/loss statistics.

Slugify is a tool for converting text into URL-friendly slugs. It handles special characters, accents, and spaces to create clean, SEO-friendly URLs.

Solar Potential is a simple tool for getting the estimated annual energy production of a PV system. It returns the estimated annual energy production of a PV system.

Spam Detector is a simple tool for detecting spam in a text. It utilize an email address or IP address to validate the given text against the spam database.

Spell Checker is a simple tool for checking spelling in a given body of text. It returns correction suggestions

Spelling Bee Generator creates word puzzles with 7 letters where players form words using a required center letter.

SPF Validator checks the Sender Policy Framework (SPF) DNS record for a domain to verify if it’s valid and optionally whether a given IP address is authorized to send emails for that domain.

SQL Explainer analyzes SQL queries and provides clear, plain English explanations of what they do. Perfect for learning SQL, code reviews, or documentation.

SRV Record Parser analyzes DNS SRV records and extracts service location information including priority, weight, port, and target server details.

SSL Checker inspects a website's SSL certificate. It returns the certificate details plus derived signals — whether it is currently valid or expired, how many days until it expires, whether it expires soon, and whether it is self-signed.

Stars Lookup is a simple tool for looking up star data. It returns the star name, mass, diameter, and more.

State Boundaries is a simple tool for getting the boundaries of a specific state's border. It returns the shape of the specified state's border.

Stock Exchange is a tool for retrieving information about stock exchanges and trading venues worldwide using ISO 10383 Market Identifier Codes (MIC). It returns exchange details including name, location, website, and classification.

Stock Index is a tool for retrieving current and historical stock market index values. It supports the S&P 500, Dow Jones, Nasdaq Composite, VIX, Nikkei 225, and more.

Stock Market Open Times is a simple tool for getting the open times of the stock market. It returns the open times of the stock market for each day of the week.