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Best functionality testing APIs

MockHero API

Tools & Utilities

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.

Free 7-Day Trial

100% uptime 186ms avg MCP ready

Mock Data API MockHero

Tools & Utilities

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

Free 7-Day Trial

100% uptime 142ms avg MCP ready

Readability API

Natural Language Processing (NLP)

Score the readability of any English text. Returns Flesch-Kincaid, Gunning Fog, SMOG, ARI scores, sentence-level breakdown, improvement suggestions, and target grade pass/fail in one call.

Free 7-Day Trial

100% uptime 423ms avg MCP ready

Statistical Quality Analytics API

Data & Analytics

Descriptive statistics, normality, correlation, and process capability (Cp/Cpk/Pp/Ppk) as a JSON API. Send a data table and a config, get clean result tables back.

Free 7-Day Trial

100% uptime 747ms avg MCP ready

Accessibility Audit API

Legal & Compliance

Run automated WCAG accessibility audits on any web page. Detects violations, warnings, and best practices for ADA and EAA compliance.

Free 7-Day Trial

100% uptime 192ms avg MCP ready

Edge Case Test Data Generator API

Tools & Utilities

Edge case test data for QA and fuzz testing: Unicode, injection probes, boundary dates, float precision. 16 types, reproducible seeds, and every value explains what it breaks.

Free 7-Day Trial

100% uptime 652ms avg MCP ready

Database Seeding MockHero API

Tools & Utilities

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

Free 7-Day Trial

100% uptime 898ms avg MCP ready

Test Data Generator MockHero API

Tools & Utilities

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

Free 7-Day Trial

100% uptime 1,451ms avg MCP ready

Dynamic Test Data MockHero API

Tools & Utilities

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

Free 7-Day Trial

100% uptime 1,531ms avg MCP ready

Fake Data API MockHero

Tools & Utilities

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

Free 7-Day Trial

100% uptime 1,646ms avg MCP ready

Fuzz Testing Input Validation Test Data Generator API

Tools & Utilities

Fuzz testing input data for validation layers: malformed strings, boundary values, control characters. 16 field types, reproducible seeds; each value explains what it breaks.

Free 7-Day Trial

100% uptime MCP ready

Unicode Internationalization Test Data Generator API

Tools & Utilities

Unicode test data for internationalization testing: combining marks, bidi overrides, ZWJ emoji, homoglyphs. Deterministic seeds, and every value explains what it breaks.

Free 7-Day Trial

100% uptime MCP ready

Injection Test String Generator API

Security & Cybersecurity

Canonical injection test strings for checking your own escaping: SQL tautology, XSS, path traversal, template injection. Harmless probes, not working exploits. Reproducible seeds.

Free 7-Day Trial

100% uptime MCP ready

Integer Floating Point Precision Testing Generator API

Tools & Utilities

Integer and floating-point edge cases: int32/int64 limits, NaN, infinity, denormals, and IEEE 754 rounding. Deterministic seeds, and every value explains what it breaks.

Free 7-Day Trial

100% uptime MCP ready

Boundary Value Off-By-One Test Data Generator API

Tools & Utilities

Boundary value test data for off-by-one bugs: int32 and int64 limits, max-length strings, empty values. Deterministic seeds, and every value explains what it breaks.

Free 7-Day Trial

100% uptime MCP ready

Malformed Hostile String Testing Data Generator API

Tools & Utilities

Malformed and hostile string test data for input handling: control characters, null bytes, encoding edge cases. Reproducible seeds, and every value explains what it breaks.

Free 7-Day Trial

100% uptime MCP ready

QA Test Fixtures CI Seed Data Generator API

Tools & Utilities

QA test fixtures and CI seed data with reproducible seeds, so pinned test runs return identical rows every time. 16 field types, each value explaining what it breaks.

Free 7-Day Trial

100% uptime MCP ready

Date Time Leap Year DST Edge Case Generator API

Tools & Utilities

Date and time edge cases: Feb 29, DST gaps, year 2038, leap seconds, and quarter-hour UTC offsets. Reproducible seeds, and every value explains what it breaks.

Free 7-Day Trial