What platforms does Theia IDE support?

Theia IDE is available on Windows, MacOS, Linux and Web App.

What are the limitations of Theia IDE?

No hosted paid tier is described, so teams must source and pay for their own model access separately. Setup of API keys and local model endpoints is on the user, which adds friction compared with managed assistants. The online try version is capped at 30 minutes per session, so it suits quick checks rather than real evaluation.

Theia IDE

Name: Theia IDE
Author: Theia IDE

Open-source, AI-native IDE where you bring your own model and keep your code private

Intermediate

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Screenshot of Theia IDE, Open-source, AI-native IDE where you bring your own model and keep your code private

What is Theia IDE?

Theia IDE is a developer tool. An open-source, AI-native IDE for desktop and cloud. Connect any LLM with your own key, keep prompts and code private, and use VS Code extensions through the Open VSX registry.

Theia IDE is an open-source development environment for desktop and cloud that treats AI assistance as a first class part of the workbench rather than a bolted on plugin. It is built on the Theia platform, a modular framework developed independently of Visual Studio Code. The project is explicit that it is not a VS Code fork, although it borrows some components such as the Monaco editor and accepts many VS Code extensions. The AI layer is the distinguishing feature. Users supply their own API key or existing subscription and connect whichever model they prefer: hosted providers such as OpenAI, Anthropic or Google, a self-hosted endpoint, or a model running entirely on the local machine. Because requests go straight to the chosen provider, no third party sits in the middle routing prompts. The team states that no telemetry is collected on code, prompts or AI usage. Prompts can be edited to match a team's conventions, and custom agents can be assembled for repetitive workflows. Day to day, the editor behaves like a conventional modern IDE. Language Server Protocol support covers Python, Java, JavaScript, C++ and most other languages, and more than 3000 extensions are available through open-vsx.org, including linters, notebook editors, Docker tooling and language packs. The workbench offers theming, a dynamic toolbar, detachable views and flexible tab handling. Installers exist for Windows, Linux and MacOS (including a dedicated ARM build), plus a Snap package and an experimental Docker image for hosting it yourself. It suits privacy-conscious engineering teams, organizations with data sovereignty rules, and developers who want AI assistance without a closed vendor deciding which models they may use. Against Cursor and GitHub Copilot it trades polish and managed convenience for transparency, model choice and open governance. A 30 minute hosted demo covers quick evaluation.

How do you use Theia IDE?

1Download and install the build for your platform
Pick the Windows installer, the Linux AppImage or Snap package, or the MacOS disk image (choose the ARM build on Apple Silicon). The experimental Docker image is available if you would rather host the IDE yourself.
2Take a quick look in the hosted demo
If you want to inspect the interface before installing anything, open the online test instance. Sessions there are limited to 30 minutes and run on Theia.cloud.
3Connect your AI provider with your own key
Open the AI configuration and add the credentials for the provider you want to use. Hosted services, self-hosted endpoints and fully local models are all supported, with no proxy in between.
4Tune prompts and build custom agents
Adjust the prompt templates to match how your team writes code, then assemble custom agents for workflows you repeat often, such as review or scaffolding tasks.
5Add extensions and confirm data handling
Install language support, linters and other tools from open-vsx.org, and read the telemetry documentation so you can state clearly what the IDE does and does not send.

Pros and cons

Pros

No telemetry on code, prompts or AI usage, and requests are not routed through a third party proxyAI
Bring your own API key or subscription and switch between cloud, self-hosted and local models freelyAI
Acceptance of the VS Code extension ecosystem gives access to more than 3000 extensions via open-vsx.orgAI
Broad language coverage through Language Server Protocol, including Python, Java, JavaScript and C++AI
Vendor-neutral open-source governance with desktop installers and a self-hostable Docker imageAI

Cons

No hosted paid tier is described, so teams must source and pay for their own model access separatelyAI
Setup of API keys and local model endpoints is on the user, which adds friction compared with managed assistantsAI
The online try version is capped at 30 minutes per session, so it suits quick checks rather than real evaluationAI
The MacOS x86 build is flagged as potentially slow and unstable on recent ARM hardwareAI
Extension compatibility depends on the Open VSX registry rather than the larger marketplace ecosystemAI

How much does Theia IDE cost?

Support

Self-service documentation covers getting started, AI features and telemetry. Community help is available through GitHub Discussions, and a support page outlines options for professional support and sponsorship.

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Integrations

Connects to AI providers such as OpenAI, Anthropic and Google, or any self-hosted or local model, using your own credentials. VS Code style extensions are installable through the Open VSX registry, which lists more than 3000 options.

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Features

AI-native workbench with bring-your-own-key model connections to hosted, self-hosted or local LLMs, editable prompts and custom agents. Language Server Protocol support spans Python, Java, JavaScript, C++ and more, with over 3000 extensions available from open-vsx.org. The modular workbench adds theming, a dynamic toolbar, detachable views and flexible tab management.

Learn more

Frequently asked questions about Theia IDE

How do you use Theia IDE?
The walkthrough on this page covers 5 steps: 1. Download and install the build for your platform 2. Take a quick look in the hosted demo 3. Connect your AI provider with your own key 4. Tune prompts and build custom agents 5. Add extensions and confirm data handling.
What platforms does Theia IDE support?
Theia IDE is available on Windows, MacOS, Linux and Web App.
What does Theia IDE integrate with?
Connects to AI providers such as OpenAI, Anthropic and Google, or any self-hosted or local model, using your own credentials. VS Code style extensions are installable through the Open VSX registry, which lists more than 3000 options.
What are the limitations of Theia IDE?
No hosted paid tier is described, so teams must source and pay for their own model access separately. Setup of API keys and local model endpoints is on the user, which adds friction compared with managed assistants. The online try version is capped at 30 minutes per session, so it suits quick checks rather than real evaluation.