Browse by Site

myvelofit.com

MyVeloFit is a parent site hosting a bike fit calculator tool designed to help cyclists optimize their seating and handlebar positions for better comfort and performance on the road.

mydentify.com

Free online tools for technical SEO audits and AI text detection.

nasm.org

NASM (National Academy of Sports Medicine) is a widely recognized fitness education organization offering certifications, resources, and training tools.

natchecker.com

Browser-based network utility for detecting carrier-grade NAT and troubleshooting connectivity issues.

nbmecalc.com

Free browser-based USMLE score prediction tool that combines exam results into confidence intervals.

nhlbi.nih.gov

NHLBI (National Heart, Lung, and Blood Institute) is a government resource providing health information and tools to manage heart, lung, and blood conditions. It includes calculators like BMI for men and women to assess body mass index.

nhs.uk

nhs.uk provides health resources and tools for individuals, including calculators for BMI in both teen and child age groups to help with weight management.

naraneungongsik.co.kr

Free online calculators for business, course creation, and financial planning.

nerdwallet.com

NerdWallet's personal finance calculators span mortgages, credit cards, banking, loans, retirement, taxes, and net worth — backed by their broader financial education content.

nestlefamilynes.info

Nestle FamilyNes.info hosts Baby Eye Color Calculator, helping parents predict their baby's eye color based on genetic information from both parents.

neurotoolkit.com

NeurologyToolKit is a resource for neurologists and medical professionals, offering a variety of tools to aid in diagnosis and treatment planning. Their collection includes the Barthel Index Calculator, which helps assess a patient's functional abilities after illness or injury.

newtum.com

Newtum offers an array of developer and productivity sub-products — an online compiler, code formatter, API tester, typing tutor, PDF toolkit, and an extensive calculators and converters library.

nmtoftlbs.com

Nm to Ft-Lbs Converter is a domain that offers a Newton-Meters to Foot-Pounds Converter tool to help users convert torque units between newton-meters and foot-pounds.

normalmapbench.com

Converts height maps to normal maps with real-time preview and local processing.

nosme.pro

Nosme.pro hosts Subtitle Translator, an online tool for converting subtitles between different languages without requiring manual translation.

numberconvert.com

Free number and unit conversion tools for distance, weight, temperature, volume, and more

numbernest.pro

Number Nest is a platform that offers various educational tools to help learners practice and improve their numerical skills. One of its sample tools is the Bean Bag Filling Calculator, which aids in understanding basic arithmetic operations through an interactive game-like interface.

oanda.com

OANDA offers foreign exchange data services and a web-based currency converter using OANDA Rates. ([oanda.com](https://www.oanda.com/currency-converter/en/?utm_source=openai))

ofx.com

OFX provides foreign exchange services and public exchange rate pages for currency pairs. ([ofx.com](https://www.ofx.com/en-us/exchange-rates/aud-to-nzd/?utm_source=openai))

otdude.com

OT Dude is a platform offering various online tools for healthcare professionals and researchers. Their sample tools include a Berg Balance Test Calculator and a BIMS Calculator – Brief Interview for Mental Status, designed to assist in patient assessments and evaluations.

offlinewebtools.com

Offline Web Tools is a site providing essential tools for offline use, including a Bearing Calculator to help with mechanical and engineering calculations when you don't have internet access.

ohmnexus.com

Free electrical calculators for lighting design, wiring, and circuit planning.

omnicalculator.com

Omni Calculator is a comprehensive tool site hosting over 3855 calculators across various categories including finance, health, technology, and more. From insulation calculations to Pokémon Go candy counters, it offers practical tools for everyday problem-solving.

omnicalculator.space

Collection of free online calculators and converters, including science/education tools. ([omnicalculator.space](https://omnicalculator.space/light-year-conversion-calculator/))

omnicanvasnotes.com

OmniCanvas is a spatial note-taking app built on an infinite canvas, plus a suite of free browser tools for writing, studying, and turning documents, images and meeting transcripts into usable notes. Every tool runs client-side — nothing is uploaded — and works without an account.

onebox.tools

OneBox.Tools is a site that hosts various online tools for encoding and decoding data. It includes a Base64 to Binary converter as an example of its functionality.

onedev.tools

onedev.tools hosts two essential developer tools: a .gitignore Generator and OneDev Developer Tools Suite, providing resources for managing code repositories and streamlining development workflows.

onetoolkit.tools

Privacy-first online toolbox with 121+ free browser tools for PDFs, images, and data formats.

onlinetools.com/binary

Online Binary Tools is the OnlineTools.com sub-site for binary numbers — conversion, bitwise operations, encoding, IP and string transformations, and Gray code support.

onlinetools.com/csv

Online CSV Tools is the CSV-specific arm of the OnlineTools.com family with 30+ tools for converting, encoding, manipulating columns, and validating CSV files.

online-calculator.org

Online Calculator.org hosts a variety of useful tools for users, including a Batting Average Calculator to help with sports statistics.

onlinegiftools.com

Online GIF Tools is a focused suite of 100+ browser-based GIF utilities — frame editing, conversions, animation speed control, format converters, and analysis tools.

online-guitartuner.com

Free online guitar tuner with real-time pitch detection and support for multiple instruments and tunings.

onlinetools.com/hex

Online Hex Tools is the OnlineTools.com sub-site dedicated to hexadecimal numbers — conversion between bases, encoding, bitwise operations, and hex-IP/colour handling.

onlinejpgtools.com

Online JPG Tools is a focused suite of 80+ browser-based JPG/JPEG utilities — conversion, resizing, colour adjustment, watermarking, and JPEG-specific artifact tools.

onlinetools.com/json

Online JSON Tools is the JSON-specific arm of the OnlineTools.com family, hosting 35 focused single-purpose tools for inspecting, transforming, encoding, and analysing JSON data.

onlinetools.com/math

Online Math Tools is the OnlineTools.com sub-site for math — number sequence generators, fractals, space-filling curves, constants, matrix operations, and visualisations.

onlinetools.com/number

Online Number Tools is the OnlineTools.com sub-site for number sequences, matrix operations, primality, fractions, base conversion, and arithmetic operations.

onlinepngtools.com

Online PNG Tools is a focused suite of 400+ browser-based PNG utilities — conversions, alpha-channel operations, colour manipulation, sizing, effects, and logo/icon/signature tooling.

onlinetools.com/random

Online Random Tools is the OnlineTools.com sub-site for randomness — shuffling, generating random numbers, dates, IPs, UUIDs, passwords, and picking winners.

onlinetsvtools.com

onlinetsvtools.com hosts Base64 to TSV, a simple online tool for converting base64 encoded data into tab-separated values (TSV) format.

onlinetexttools.com

Online Text Tools is a focused 200+ collection of single-purpose text manipulation utilities — splitting, joining, sorting, randomizing, formatting, encoding, and analysing text in every conceivable way.

online-tone-generator.com

Generate pure tones from 20 Hz to 20 kHz with multiple waveforms for speaker testing and audio experimentation.

onlinetools.com/utf8

Online UTF-8 Tools is the OnlineTools.com sub-site for UTF-8 encoding — base conversions, code-point handling, case operations, and cross-encoding utilities.

onlinetools.com/unicode

Online Unicode Tools is the OnlineTools.com sub-site for Unicode — encoding conversion, code-point handling, grapheme operations, and homoglyph (spoofing) tools.

onlinewebdevtools.com

Online Web Dev Tools is a domain hosting various web development utilities. One tool offered is Base64 to Hexadecimal converter for encoding and decoding tasks in web development.

onlinexmltools.com

Online XML Tools is a focused collection of XML-specific utilities — formatting, validation, conversion to JSON / CSV / YAML / TSV, encoding, and inline editing.

onlineyamltools.com

Online YAML Tools is a focused collection of YAML-specific utilities — formatting, validation, conversion to JSON / XML / CSV / TSV, encoding, and inline editing.

online-convert.com

online-convert.com hosts BMP to PNG Converter, a tool for converting bitmap images to PNG format online.

onlinecalculator.com

OnlineCalculator.com is a site offering various online calculators and converters, including a Barrels to Liters Volume Converter.

onlinecompress.net

onlinecompress.net provides online video compression tools to help users reduce file sizes without compromising quality.

onlineconversion.com

OnlineConversion.com hosts a variety of online conversion tools, including an Astronomical Unit Calculator, Barometric Pressure Conversion, Base converter, and more. These tools help users convert units across different measurement systems for scientific, engineering, and everyday use.

onlinetoolkit.co

OnlineToolkit.co hosts a range of useful online tools for various needs. Currently featuring an Average Rating Calculator to help with averaging scores or ratings efficiently.

onlinetools.com

onlinetools.com hosts a collection of image and data conversion tools, including Base64 to JSON converter and BMP to Base64 encoder.

onlycalculators.com

OnlyCalculators.com hosts a variety of useful online calculators, including an Associative Property Calculator, BC to AD Converter, Ballistic Coefficient Calculator, and Beta Distribution Calculator. These tools help users with mathematical and conversion tasks efficiently.

openpsychometrics.org

openpsychometrics.org hosts a collection of psychological assessment tools designed to help individuals understand themselves better and explore career options through personality quizzes and other assessments.

openfate.ai

Free Bazi birth chart calculator with optional AI-powered interpretations.

orbit2x.com

Orbit2x provides navigation-focused web utilities for coordinate and route calculations.

pcalen.com

Generates customizable printable calendars with holiday options for PDF export.

pdfcandy.com

PDF Candy offers a friendly free-tier PDF toolbox covering editing, merging, splitting, security, compression, OCR-style operations, and page rearrangement.