Free tools to check PHP versions and test code compatibility across versions 7.4 to 8.5
Stage
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Founded
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Based in
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Pricing model
Freemium
Free
Pricing
Free plan includes upload and process small files, Chrome/VS Code extension, unlimited downloads, and visualization with tables and charts. Pro plan costs $2.49/month (monthly) or is available yearly, includes ad-free experience, compare and analyze data, edit JSON from diagrams, unlimited diagrams
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Key features
Interactive tree view with expand/collapse and color-coded syntax highlighting
Side-by-side JSON comparison with visual diff viewer
AI-powered JSON diagram generation from natural language
Convert JSON data into dynamic charts and graphs
Chrome extension for instant visualization on any webpage
Multi-format support for YAML, XML, CSV, TOML, TOON and Mermaid
REST API client with diagram visualization of responses
Customizable themes and multi-node color customization
Export diagrams as images and download graphs
PHP Version Checker to detect website PHP versions via headers and markers
Multi-version code compatibility checker testing 7.4 to 8.5
PHP Sandbox running code in your browser with real PHP interpreters
PHP Syntax Checker identifying parse errors and deprecated functions
PHP EOL Dates calendar with support status for all versions
Bcrypt Generator for password hashing
phpinfo() Analyzer explaining server configuration
PHP Date Format tester
PHP Formatter for code formatting
PHP Regex Tester for preg_match patterns
What makes it different
Supports 6+ data formats including JSON, YAML, XML, CSV, TOML and TOON in one tool
AI-powered assistant to generate and transform JSON using natural language commands
Chrome and VS Code extensions for seamless workflow integration
Privacy-first design with data stored only upon manual upload
Native mobile apps for Android and iOS for on-the-go visualization
All code runs in your browser on WebAssembly, never uploaded to servers
Completely free with no sign-up required
Website checker works on any device including school machines without software installation
JSON Viewer
PHP Checker