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Best testing tool APIs

MockHero API

Generate realistic, schema-aware synthetic test data for any database schema. 50+ field types, AI prompt-to-schema, pre-built templates, JSON/SQL/CSV output.

Tools & Utilities Free 7-Day Trial

100% uptime 186ms avg MCP ready

Spell and Grammar Checker API

This API is able to detect any spelling or grammar errors in your application. Submit text and receive a JSON response with potential errors and suggested corrections.

Natural Language Processing (NLP) Free 7-Day Trial

100% uptime 174ms avg MCP ready

Test User Creation API

"Elevate applications and simulations with a versatile, randomized user profile generator for authentic testing and development."

Tools & Utilities Free 7-Day Trial

100% uptime 251ms avg MCP ready

Email Validation Tool API

Email Validation Tool API ensures accurate, secure communication by verifying email addresses in real-time, preventing bounces and enhancing data quality.

Communication & Messaging Free 7-Day Trial

100% uptime 104ms avg MCP ready

Mock Data API MockHero

MockHero’s Mock Data API simplifies creating placeholder data, perfect for testing and development needs.

Tools & Utilities Free 7-Day Trial

100% uptime 142ms avg MCP ready

Schema Aware Data Generation MockHero API

Enhance your data generation with MockHero's Schema Aware Data Generation API, ensuring data integrity and relevance.

Data & Analytics Free 7-Day Trial

100% uptime 93ms avg MCP ready

Synthetic Data MockHero API

The Synthetic Data Synthetic Data MockHero API allows developers to generate diverse datasets while preserving privacy and compliance.

AI & Machine Learning Free 7-Day Trial

100% uptime 113ms avg MCP ready

OneCompiler

Fast & reliable online code compilation and execution of APIs for 50+ languages & databases

Tools & Utilities Free 7-Day Trial

100% uptime 76ms avg MCP ready

Text Change Detector API

The Text Change Detector API is an tools for comparing two texts and highlighting their differences. It offers results in JSON format and pre-rendered for HTML and CLI.

Natural Language Processing (NLP) Free 7-Day Trial

100% uptime 263ms avg MCP ready

Retrieve Web Data Speed Test API

Quickly assess the efficiency of your site using the Retrieve Web Data Speed Test API for optimal performance insights.

Tools & Utilities Free 7-Day Trial

100% uptime 527ms avg MCP ready

Intelligent Tools API

Access over 10,000 artificial intelligence tools and sites. Find relevant solutions for text, images, business, chatbots and more with intelligent search.

AI & Machine Learning Free 7-Day Trial

100% uptime 573ms avg MCP ready

Social Preview QA API

Instantly validate how any URL will appear when shared on Facebook, LinkedIn, Twitter, and WhatsApp. Returns a full JSON report with platform-specific scores, broken tag detection, image dimension checks, and plain-English fix instructions — all in a single API call.

Social Media & Networking Free 7-Day Trial

100% uptime 1,105ms avg MCP ready

Test Data Generator MockHero API

Generate realistic test data effortlessly with MockHero's Test Data Generator API, enhancing your development process.

Tools & Utilities Free 7-Day Trial

100% uptime 1,451ms avg MCP ready

Dynamic Test Data MockHero API

Effortlessly generate dynamic test data on demand using MockHero's Dynamic Test Data API, optimizing your testing process.

Tools & Utilities Free 7-Day Trial

100% uptime 1,531ms avg MCP ready

Web Speed Test API

Evaluate web performance by measuring server-client metrics, detect common issues, and generate detailed automatic optimization suggestions.

Data & Analytics Free 7-Day Trial

100% uptime 5,864ms avg MCP ready

Database Seeding MockHero API

Use the Database Seeding Database Seeding MockHero API to populate your databases with quality test data, streamlining your development workflow.

Tools & Utilities Free 7-Day Trial

100% uptime 1,619ms avg MCP ready

Fake Data API MockHero

Create fully customizable fake data quickly using MockHero's Fake Data API, tailored to your project’s requirements.

Tools & Utilities Free 7-Day Trial

100% uptime 1,646ms avg MCP ready

Transient Mail Verification API

The Transient Mail Verification API validates email addresses, identifying temporary or disposable ones to prevent spam and fraud.

Security & Cybersecurity Free 7-Day Trial

100% uptime 1,357ms avg MCP ready

Temporary Mail Validator API

Ensure data integrity by identifying temporary email addresses instantly, preventing spam signups and improving communication with genuine users.

Security & Cybersecurity Free 7-Day Trial

100% uptime 764ms avg MCP ready

CI CD Email Testing Solutions FreeCustomEmail - Temp Email and OTP Testing API

Optimize your CI/CD pipeline with our email testing solutions—lightning-fast and robust!

Communication & Messaging Free 7-Day Trial

100% uptime MCP ready

Cut your bounce rate in half

Improve your email deliverability rates with our Cut your bounce rate in half, ensuring messages always get seen.

Communication & Messaging Free 7-Day Trial

100% uptime MCP ready

Domain Verify Tools API

The Domain Verify Tools API is a comprehensive tool for verifying the availability of domains, MX records, A records, and WHOIS data, providing all the information in one place.

Tools & Utilities Free 7-Day Trial

100% uptime 2,381ms avg MCP ready

Speed Test Data Retrieval API

Monitor internet speeds effortlessly with the Speed Test Data Retrieval API, ensuring optimal performance for users.

Tools & Utilities Free 7-Day Trial

100% uptime 10,646ms avg MCP ready

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Best testing tool APIs

MockHero API

Spell and Grammar Checker API

Test User Creation API

Email Validation Tool API

Mock Data API MockHero

Schema Aware Data Generation MockHero API

Synthetic Data MockHero API

OneCompiler

Text Change Detector API

Retrieve Web Data Speed Test API

Intelligent Tools API

Social Preview QA API

Test Data Generator MockHero API

Dynamic Test Data MockHero API

Web Speed Test API

Database Seeding MockHero API

Fake Data API MockHero

Transient Mail Verification API

Temporary Mail Validator API

CI CD Email Testing Solutions FreeCustomEmail - Temp Email and OTP Testing API

Cut your bounce rate in half

Domain Verify Tools API

Speed Test Data Retrieval API

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