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Best testing environments 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

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

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

FreeCustomEmail - Temp Email and OTP Testing API

FreeCustom.Email is a powerful API that enables users to generate temporary email addresses for seamless online registration and OTP testing. With its user-friendly interface, you can effortlessly create disposable email accounts to bypass spam and enhance privacy, while easily receiving one-time passwords and verification emails without any hassle. Ideal for developers and testers, this API ensures secure and anonymous interactions with online services.

Communication & Messaging Free 7-Day Trial

100% uptime 398ms avg MCP ready

Mock User Identity Creator API

The Mock User Profile Generator API is a versatile tool that creates fictional user profiles for a wide range of applications, such as testing, design, research.

Tools & Utilities Free 7-Day Trial

100% uptime 437ms 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

Validate Emails and Phone Numbers API

Shield your platform from spam with the Validate Emails and Phone Numbers API.

Communication & Messaging Free 7-Day Trial

100% uptime 130ms avg MCP ready

Username Toxicity Detection API

"The Username Toxicity Detection API safeguards online communities by identifying and flagging toxic or offensive usernames in real time."

Social Media & Networking Free 7-Day Trial

100% uptime 188ms avg MCP ready

Phone and Email Validation API

Validates phone numbers and email addresses, confirming correct formats, country codes, location, number type, and active MX records.

Communication & Messaging Free 7-Day Trial

100% uptime 1,485ms 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

BigFive Sentiment Analysis API

The BigFive Sentiment Analysis API uses advanced machine learning algorithms to analyze text and determine the emotions and personality traits expressed within it. It can classify text into five main categories: Openness, Conscientiousness, Extraversion, Agreeableness, and Neuroticism, and provide the results in a structured format.

Natural Language Processing (NLP) Free 7-Day Trial