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Markup Validation Service helps clean, compare, sort, transform, count, or format text in the browser.

AI agents that act as your personal venture analyst - from startup idea brainstorming to full validation and go-to-market strategy. Built for developers who'd rather validate in 10 minutes than regret in six months. Powered by Claude Code, OpenAI Codex, and Cursor.

Phone validation service for checking number format, country, carrier, and line type information.

Lightweight, extensible data validation library for Python.

Generates test credit card numbers used for payment form testing and software development.

Hunter tool for verifying if an email address is valid, deliverable, and safe to use before outreach.

Eurybia monitors data and model drift over time and securizes model deployment with data validation.

Interactive reports to analyze ML models during validation or production monitoring.

Machine Learning library for PHP. Algorithms, Cross Validation, Neural Network, Preprocessing, Feature Extraction and much more in one library.

Open source email verification service for checking syntax, MX records, and deliverability through an API.