If you are new to a certain coding language, or continuously switching between various, this site has more than 45 compilers for you to test small or big codes.
From the traditional Java, C, C++, C#, Python to the more exotic Elixir, Erlang or old Cobol souvenirs.
It does also the web languages so as 9 databases queries interaction. It that later case, having defined a database sample to reuse will be a must for complex queries development.
| OneCompiler | Replit | JDoodle | Visual Studio Code |
|---|---|---|---|
| Scope and languages: The site states 110+ languages and lists databases such as MySQL, MongoDB, PostgreSQL and Oracle PL/SQL, so one page covers small programs and query tests. | Scope and languages: Replit presents itself as a platform to build apps and sites by describing them in natural language, with built-in hosting, authentication and a database. Supported languages are not listed on its home page. | Scope and languages: JDoodle states 114 languages, frameworks and databases, aimed at learning, teaching and practice. | Scope and languages: VS Code is a general code editor whose Extension Marketplace lists over 80,000 extensions, so language support depends on the extensions installed. |
| Platform and installation: It runs in the browser with no installation, which suits quick tests on any machine. | Platform and installation: It is a browser IDE that needs no installation or setup, with projects saved to the cloud. | Platform and installation: It is installed on macOS, Windows or Linux. A browser version exists at vscode.dev for quick edits on GitHub and Azure Repos. | |
| Cost model: The editor is free to use and some AI models are described as free. A pricing page exists, but no amounts were confirmed. | Cost model: Replit lists a free Starter plan with daily free usage and one published project, plus paid Core and Pro subscriptions. | Cost model: JDoodle lists a free plan (1,000 code executions per day, 100 saved projects) and paid Student, Pro and Teacher subscriptions. | Cost model: VS Code is free and open source according to its site. |
| API and embedding: The site offers APIs for running code and an editor that can be embedded as an iFrame. | API and embedding: JDoodle offers a Compiler API for backend use and an embeddable IDE for blogs, documents and applications. | ||
| AI and classroom features: An in-browser AI agent edits files in the workspace, and the user can choose models from several providers. There are checkpoints to restore earlier states. | AI and classroom features: The Agent writes code from a project description, and Core adds a Plan mode. | AI and classroom features: JDoodle adds assignments, automated grading, live shared editing and an AI companion that explains code and bugs. | AI and classroom features: VS Code offers a free tier for AI agents with a GitHub account and supports MCP servers. |
Topics covered: compilers, programming languages, Java, C, C++, Python, Elixir, Erlang, Cobol, web languages, databases, queries, code testing, database sample, complex queries, interaction, software development, code execution, ANSI C, ISO/IEC 9899, ISO/IEC 14882, ISO/IEC 30170, and ECMA-262..
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