Does SQL Runner connect to my database?
No. It uses an in-memory SQLite database in the browser.
⌕ 6 tools
Test behavior before shipping
Use Regex Tester to inspect matches and capture groups, Cron Parser to see upcoming runs, and .NET Format String Tester to compare formatted values across supported cultures.
SQL Runner executes queries in an in-memory SQLite database. GraphQL Playground uses local mock resolvers generated from a schema. Accessibility Checker audits pasted HTML with axe-core; automated checks still need manual keyboard and screen-reader review.
Regex Tester & Builder Live matching Cron Expression Parser Next 12 runs GraphQL Playground Mock resolvers SQL Runner (SQLite) SQLite WASM Accessibility Checker axe-core .NET Format String Tester (C# ToString) Matches real .NET 8
What the query tools execute
SQL Runner uses an embedded SQLite engine in the tab. GraphQL Playground works against mock data, not a remote API. Neither is a substitute for testing your production database or service.
Check the actual environment
The .NET Format String Tester is a browser reimplementation checked against .NET 8 reference cases. Confirm critical output in the runtime, OS, globalization mode and time zone your application uses.
FAQ
Short answers for the things developers usually ask before trusting a tool.
Can Accessibility Checker audit a whole live site?
It audits the HTML pasted into the page. JavaScript-rendered behavior, other pages and manual accessibility checks remain outside its scope.