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Best evaluate APIs

Expression Evaluation API

Tools & Utilities

The Expression Evaluation API is a versatile natural language calculator that can evaluate mathematical expressions and return the results in plain text. Simply input the expression to be evaluated, and the API will scan and compute the calculation, making it an easy-to-use tool for developers who want to incorporate a calculator function into their applications.

Free 7-Day Trial

100% uptime 277ms 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

Automotive Value Benchmark API

Automotive & Vehicle Data

Benchmark your vehicle’s worth effortlessly with the Automotive Value Benchmark API.

Free 7-Day Trial

100% uptime 42ms avg MCP ready

Image Contrast Enhancement API

Visual Recognition & Imaging

Enhance the contrast of overly dark or bright images, making them more vivid and visually appealing with the Image Contrast Enhancement API.

100% uptime MCP ready

Keyword Evaluator API

Data & Analytics

The Keyword Evaluator API assesses keyword competitiveness, aiding SEO strategies by providing real-time insights for informed decision-making.

Free 7-Day Trial

100% uptime 3,564ms avg MCP ready

Change Facial Expressions API

Visual Recognition & Imaging

Transform facial expressions in images with advanced editing technology, enabling smiles, pouts, frowns, and more with our API.

100% uptime MCP ready

Car Analyzer by Image API

Automotive & Vehicle Data

Analyzes a vehicle image and returns the make, model, year, color, type, condition, external features, and confidence level.

Free 7-Day Trial

100% uptime 563ms avg MCP ready

Python Data Optimizer API

Data & Analytics

Your ultimate solution for reducing memory usage, cutting storage costs, and enhancing application performance—all without the need to rewrite your existing business logic. With a single API call, you receive a comprehensive savings report detailing the optimization in bytes, KB, MB, or GB.

Free 7-Day Trial

100% uptime 2,109ms avg MCP ready

Localization QA API

Natural Language Processing (NLP)

Checks translated JSON, localization strings, placeholders, ICU messages, missing keys, extra keys, empty values, untranslated values, and multi-locale consistency.

Free 7-Day Trial

100% uptime 4,137ms avg MCP ready

EdTech Readability Improvement API

Science & Education

Boost student understanding with the EdTech Readability Improvement API designed for educational content.

Free 7-Day Trial

100% uptime MCP ready

User Engagement Readability API

Natural Language Processing (NLP)

Increase user engagement by enhancing readability with the User Engagement User Engagement Readability API.

Free 7-Day Trial

100% uptime MCP ready

Accessibility Compliance Readability API

Legal & Compliance

Make your content accessible to all users with the Accessibility Compliance Accessibility Compliance Readability API.

Free 7-Day Trial

100% uptime MCP ready

Academic Readability Analysis API

Natural Language Processing (NLP)

Analyze and improve academic texts with the Academic Readability Analysis API for robust insights.

Free 7-Day Trial

100% uptime MCP ready

Legal Compliance Readability API

Legal & Compliance

Ensure your legal documents are crystal clear with the Legal Compliance Legal Compliance Readability API.

Free 7-Day Trial

100% uptime MCP ready

SEO Optimization Readability API

Natural Language Processing (NLP)

Optimize your SEO strategy by improving readability with the SEO Optimization SEO Optimization Readability API.

Free 7-Day Trial

100% uptime MCP ready

Technical Writing Readability API

Natural Language Processing (NLP)

Streamline complex information using the Technical Writing Technical Writing Readability API for clear communication.

Free 7-Day Trial

100% uptime MCP ready

Content Marketing Readability API

Natural Language Processing (NLP)

Enhance your content's clarity with the Content Marketing Content Marketing Readability API for better engagement.

Free 7-Day Trial

100% uptime MCP ready

Email Quality Evaluation Fetch API

Communication & Messaging

Fetch comprehensive evaluations of your email quality to enhance communication and boost performance.

Free 7-Day Trial

100% uptime 652ms avg MCP ready

Decision Optimizer API

AI & Machine Learning

The Decision Optimizer API optimizes complex decisions by mapping elements to requirements with customized constraints, maximizing results and minimizing costs, ideal for resource, budget and allocation efficiency.

Free 7-Day Trial