HttpMaster
Hoppscotch
API Fortress
Postman
Assertible
Request inspector
SoapSonar
CurlHub.io
AllTools.dev
AllToolsLab
geteasetools.com
Omni Calculator
calculator.net
elec calc
30tools
Convertio
Core HttpMaster features are: * HttpMaster project to store complete definition of API calls in one single place. * Broad set of http properties. * Dynamic parameters to simulate variations of input data or create global API values. * Response data validation with logical expressions. * Request chaining to use data from previous request with the next request. * Extensive data upload support, including 'multipart/form-data'. * Request data builder for creating request body with an optional dynamic parameters. * Request item execution with detailed progress monitoring. * Execution groups to create batches of requests. * Comprehensive execution data review and management. * Additional tools (basic request tool for ad-hoc execution, command line interface, OpenAPI import, etc).
AllTools.dev is a modern, fast, free online toolkit built for people who need quick, accurate calculators and converters without signing up, creating an account, or wading through cluttered interfaces. The platform offers 500+ tools across finance (mortgage calculators, loan amortization, compound interest, currency conversion, debt payoff, retirement planning), health (BMI, calorie needs, pregnancy tracking, ideal weight, body composition), math (scientific, statistical, geometric, percentage, fraction), science and engineering, date and time utilities, unit conversions (volume, length, temperature, power, area), developer utilities (JSON, regex, JWT, hashing), and interactive math and algorithm visualizations. Every tool is free and works instantly in the browser. No accounts, no paywalls, no sign-in walls, no data collection beyond standard analytics. Calculations happen client-side for speed and privacy. Unlike older established calculator sites that grew through 20 years of ad-heavy layouts and outdated UX, AllTools.dev is built fresh on Astro with a clean, mobile-first, accessibility-conscious interface. New calculators ship weekly based on user demand. Ideal for: students doing homework, developers needing quick conversions, finance-minded folks planning loans and investments, professionals doing scientific or engineering calculations, and anyone who just needs a fast answer without installing an app.
HttpMaster
AllTools.devHttpMaster is well-suited for developers, QA engineers, and testers who need to perform end-to-end testing of web APIs. It's particularly beneficial for those who require a versatile testing solution with both automated and manual testing features. It's also ideal for teams that need to validate the functionality, performance, and security of their web apps through an intuitive platform.
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HttpMaster's answer
Developers and testers.
HttpMaster's answer
HttpMaster's answer
Performance, simple UI, resource friendly.
HttpMaster's answer
Microsoft .NET.
Hoppscotch - Open source API development ecosystem
AllToolsLab - AllToolsLab offers 50+ free online tools including PDF tools, calculators, converters and text utilities.
API Fortress - API performance, accuracy, and uptime testing. Without code.
geteasetools.com - 1000+ free tools on Ease Tools including calculators, converters, generators and utilities with no signup, no ads and instant access.
Postman - The Collaboration Platform for API Development
Omni Calculator - Helping you make rational decisions, one calculation at a time.