Browse by Site

radformation.com

Radformation.com hosts tools for radiation safety and health professionals. The BED Calculator helps estimate bone marrow equivalent doses from exposure data.

random-group-generator.com

Browser-based tool for creating and managing random groups and pairs for classrooms and events.

randompicturegenerator.com

Generates random pictures across multiple categories with themed options and a favorites system.

randompokemongenerator.dev

A free browser-based Pokémon randomizer with filters, seeds, and sharing for gameplay and creative prompts.

randomizerlab.com

Browser-based randomization tools for decisions and games.

rankforge.cc

Free browser-based SEO crawler that finds orphan pages, maps internal links, and reports broken links.

ranklatch.com

Free SEO analysis tool that scans pages and compares changes stored locally in your browser.

rapidtoolsonline.com

Rapid Tools Online offers a toolbox of utilities and unit converters. ([rapidtoolsonline.com](https://www.rapidtoolsonline.com/unit-converters/prefixes-converter))

rapidtables.com

RapidTables.com hosts 518 tools for quick calculations and conversions, including a battery capacity calculator, lux to watts converter, millicandela to lumens converter, random number generator, AWG to mm converter, and date calculator.

ratesandlimits.com

Calculators for retirement contribution limits and IRS employee compliance.

ray.so

Ray.so by Raycast is a modern alternative to Carbon for creating beautiful code-snippet images with curated themes.

readmorse.com

Free privacy-first Morse code decoder and translator that works with images, screenshots, and text in your browser.

readycalculator.com

ReadyCalculator.com hosts a variety of practical tools to help with everyday tasks, including a Bathroom Mirror Size Calculator to determine optimal mirror dimensions for your space.

realtor.com

Realtor.com is a major real estate marketplace that also provides mortgage tools and resources. ([realtor.com](https://www.realtor.com/mortgage/?utm_source=openai))

bakingcalc.com

bakingcalc.com hosts a Baker's Percentage Calculator tool for bakers to accurately measure ingredients in recipes.

redcrab-software.com

Redcrab Software is a platform offering educational calculators for mathematics and science. Their sample tools include an Associative Property Calculator and a Bessel Function Calculator, designed to help users learn and solve complex problems in algebra and engineering.

regexr.com

RegExr is a long-running visual regular expression tester for JavaScript and PCRE flavours, with side-by-side reference and shareable patterns.

relahconvert.com

RelahConvert.com hosts File Converter Suite, a set of tools for converting files between various formats.

reverseaudiotool.com

Free online tool for reversing audio files instantly in your browser.

rheumcalc.com

RheumCalc is rheumcalc.com hosts a BASDAI Score Calculator tool to help healthcare providers assess the severity of rheumatoid arthritis in patients.

ritzelrechner.de

Ritzelrechner.de hosts a Bike Gear Calculator tool for determining optimal gear ratios based on bicycle specifications and riding conditions.

rootutils.com

RootUtils.com hosts a collection of useful tools for developers and tech enthusiasts, including a .gitignore Generator to help create configuration files for Git repositories.

runbikecalc.com

RunBikeCalc is a site where you can find bike cadence calculators and other cycling-related tools to help improve your riding experience.

ryanoconnellfinance.com

Ryan O'Connell Finance hosts an Asset Allocation Calculator & Visualizer to help users optimize their investment portfolios by balancing various asset classes.

sceditor.com

sceditor.com hosts a BBCode Editor tool, allowing users to create rich text content using simple BBCode syntax.

seoreportkit.com

Free SEO analysis tools for Google Search Console data.

sgpacgpa.com

Free calculator suite for SGPA, CGPA, percentages, and academic target calculations.

sqlnice.com

Browser-based SQL formatter with subquery recognition — no signup, no uploads.

ssllabs.com

Qualys SSL Labs runs a deep TLS/SSL configuration analysis on any web server, the gold-standard report for HTTPS security posture.

stlfileconverter.com

Convert and preview 3D model files in your browser with no account or upload required.

jakearchibald.github.io/svgomg

SVGOMG is Jake Archibald's web GUI for the SVGO optimiser — the standard tool for shrinking SVG files for production use.

sadevz.com

Free online developer and utility tools for formatting, validating, generating, and optimizing files.

safeaudiokit.com

safeaudiokit.com offers an Audio File Size Calculator tool to help determine the file size of audio files based on their length and bitrate.

sagecalculator.com

Sage Calculator is a website hosting several practical tools for everyday use. It offers an Ast Alt Ratio Calculator for astronomy enthusiasts, a Baby Formula Calculator for new parents, and a Baby's Milk Intake Calculator to help determine appropriate feeding amounts. The site provides quick access to these useful resources without requiring registration or subscription.

fabric-calculator.com

Sailrite’s long-running DIY sewing and upholstery calculator platform for planning fabric and supplies.

salario.io

Free salary and compensation calculators for analyzing pay, take-home amounts, and job offers.

salary.com

Salary.com provides online salary calculators and compensation insights for job seekers. ([salary.com](https://www.salary.com/research/salary/?utm_source=openai))

satnow.com

SatNow is an engineering marketplace and knowledge platform with RF/satellite resources, calculators, and technical tools.

sauna.guide

Online resources for evaluating and planning home sauna purchases.

savvycalculator.com

Savvy Calculator is a site that offers handy tools for various calculations. One of its features includes a Baud Rate Calculator, which helps determine the number of bits transferred per second in digital communication systems.

schoolmykids.com

Educational site with learning resources and built-in calculators, including force unit conversion tools. ([schoolmykids.com](https://www.schoolmykids.com/learn/calculators/attonewton-to-femtonewton-conversion-force-converter-calculator?utm_source=openai))

scoremetrik.com

Browser-based scoreboards for basketball, baseball, football, soccer, volleyball, and more.

screensizechecker.com

Instantly check your screen resolution, viewport dimensions, and pixel ratio for responsive design testing.

scrixo.com

securityheaders.com

Security Headers scans a site's HTTP response headers and assigns a letter-grade security score with detailed remediation guidance.

semestergradescalculator.com

Calculate your current semester grade based on weighted course components.

sendcutsend.com

SendCutSend.com hosts tools for engineering and manufacturing, including a Bend Allowance Calculator to help with metal forming calculations.

sensorsone.com

sensorsone.com hosts an online toolset for various unit conversions, including frequency (e.g., Attohertz to Hertz) and pressure (e.g., Bar to PSI). These utilities help with quick calculations across different scientific and engineering measurements.

sertifikamatik.com

Free online bulk certificate generator with customizable templates and data import.

shapesense.com

shapesense.com hosts a BAI Calculator to help assess body fat percentage based on weight and height measurements.

shard.tools

Free online utility tools for various productivity tasks.

sheldonbrown.com

Sheldon Brown provides cycling-related tools like a bike gear calculator and speed calculator to help riders optimize their performance.

shields.io

Shields.io generates SVG status badges for README files — for build, version, license, downloads, and dozens of other endpoints.

simpleagecalculator.com

simplecalculator.co

SimpleCalculator.co is a site that offers various calculators to simplify everyday math tasks. It includes an Average Rating Calculator to help find the mean of multiple numbers quickly and easily.

sitetidy.app

Browser-based platform with 180+ tools for SEO, web development, and website auditing.

sixpacksmackdown.com

SixPackSmackdown.com hosts a Bench Press Pyramid Calculator tool designed to help fitness enthusiasts optimize their bench press routine for maximum strength gains.

sizecompare.app

skyclockonline.com

Browser-based game clock and cycle tracker for Sky gaming sessions and recurring events.

skycotl.tools

Free fan-made toolkit for tracking events, shards, and candles in Sky: Children of the Light.