MarsCode

Free plan ExtensionLinuxMacWebWindows

What MarsCode is

MarsCode is an AI coding assistant available as a browser service and an IDE extension for Windows, macOS, Linux, and the web. It offers code completion, code generation, explanations, AI question-and-answer help, and bug fixing, plus a coding agent and codebase indexing. The Trae Plugin integrates with VS Code and JetBrains IDEs, supports more than 100 programming languages, and lists Builder Mode, unit-test generation, AI Fix, documentation generation, and AI Q&A. Its cloud development environment runs in a browser without a download and can start with one click. Projects can begin from templates or a Git repository. MarsCode also describes tools for creating, testing, deploying, and distributing AI plugins, including API testing, storage, schema management, and deployment. The service has a free plan and a 14-day trial. Its privacy policy says code and other content may be collected for improvement and machine-learning development, with storage in the United States and/or Singapore.

Who it suits

MarsCode suits developers who want AI assistance in VS Code, JetBrains IDEs, or a browser workspace. It also fits teams building and distributing AI plugins.

What it does well

Code assistance covers completion, generation, explanations, and bug fixing
Browser cloud environment needs no download
Supports more than 100 programming languages
Works with VS Code and JetBrains IDEs
Free plan and 14-day trial available

What to know first

Privacy policy allows collection of code and user content
Collected information may be stored in the United States or Singapore

Plans

Plan	Billed and limits	Price
Lite	Basic usage and bonus usage · Premium model availability	On request
Pro	Higher monthly usage · Access to Pro features and SOLO capabilities	On request
Pro+	Higher monthly token allowance than Pro	On request
Ultra	Highest listed membership tier · SOLO access included	On request
Free	Start for free; no further limits stated	Free

As marscode.com lists them, read 22 Sept 2026. The maker's own page has the final word.

Verdict

MarsCode combines IDE plugins with a browser-based development environment and broad language support. Review its data-use terms and unlisted membership pricing before choosing a paid tier.

Facts from MarsCode's own pages

Coding agent: Yes · marscode.com, 22 Sept 2026
AI coding assistant: MarsCode provides code completion, code generation, code explanation, AI Q&A, and bug fixing. · marscode.com, 11 Oct 2026
AI plugin tools: MarsCode describes tools for developing, testing, deploying, and distributing AI plugins, including API testing, storage, schema management, and deployment. · marscode.com, 11 Oct 2026
Chat assistance: Yes · marscode.com, 22 Sept 2026
Cloud development: Its browser based cloud development environment requires no download and can be initialized with one click. · marscode.com, 11 Oct 2026
Codebase indexing: Yes · marscode.com, 22 Sept 2026
Code completion: Yes · marscode.com, 22 Sept 2026
Data location: The privacy policy says collected information may be stored on secure servers in the United States and/or Singapore. · marscode.com, 11 Oct 2026
Free plan: Yes · marscode.com, 22 Sept 2026
IDE integrations: The Trae Plugin page says it integrates with VS Code and JetBrains IDEs. · marscode.com, 11 Oct 2026
Languages: The Trae Plugin page says it supports over 100 programming languages, with particular proficiency in Python, Go, JavaScript, TypeScript, C++, Java, Kotlin, C, and Rust. · marscode.com, 11 Oct 2026
Plugin features: The Trae Plugin page lists Builder Mode, unit test generation, AI Fix, code explanation, documentation generation, and AI Q&A. · marscode.com, 11 Oct 2026
Privacy and data use: The privacy policy says MarsCode may collect code and other user content and use information to improve the platform and train or improve its machine learning models and algorithms. · marscode.com, 11 Oct 2026
Project setup: Users can create projects from templates or import them from a Git repository. · marscode.com, 11 Oct 2026
Provider: The terms say MarsCode is provided by SPRING (SG) PTE. LTD. or one of its affiliates. · marscode.com, 11 Oct 2026
Security: The privacy policy says MarsCode maintains technical, administrative, and physical security measures designed to protect information from unauthorized access, theft, disclosure, modification, or loss. · marscode.com, 11 Oct 2026
Support: The community page offers direct support from the team and a place to submit suggestions and feedback. · marscode.com, 11 Oct 2026
Supported IDEs: VS Code,JetBrains IDEs · marscode.com, 22 Sept 2026