What is Radius?
Radius is a developer-focused browser created by Sandbox Technologies INC. It is designed around the idea that the browser can serve as an IDE and orchestration environment for AI coding agents. Instead of keeping the browser, terminal, IDE, pull-request interface and agent sessions in separate applications, Radius places these workflows together inside one browser window.
Radius allows developers to run Claude Code, Codex and Cursor Agent directly inside browser tabs using the accounts and subscriptions they already have. Radius itself does not require a separate AI-agent subscription.
The browser treats different development surfaces as tabs, including coding-agent sessions, terminals, diff viewers, pull requests, documentation, dashboards and localhost servers. Developers can organize these tabs into project-oriented Spaces and worktree-based tab groups.
Radius is designed to support parallel development workflows. Agents can work in separate worktrees while developers keep related code, terminal output, documentation, PRs and local applications accessible in the same workspace. The product also provides a CLI for scripting browser windows, tabs, groups, splits and other workspace operations.
The Radius CLI is available as the npm package @sandbox-technologies/radius-cli. The package supports macOS and Node.js 20 or newer and provides commands for controlling Radius windows, tabs and other browser workspace components.
Radius is built on Chromium, so websites and web applications behave similarly to those in a modern Chromium browser. The current product supports macOS only, with downloads available for Apple Silicon and Intel Macs.
The product follows a local-first architecture. Radius states that projects, source code, worktrees, browser state, terminal sessions, chat history and agent state are stored locally on the user's device by default rather than routinely uploaded to a hosted copy. When users invoke an AI agent or cloud-backed integration, relevant information may be transmitted to the selected provider.
Radius allows developers to run Claude Code, Codex and Cursor Agent directly inside browser tabs using the accounts and subscriptions they already have. Radius itself does not require a separate AI-agent subscription.
The browser treats different development surfaces as tabs, including coding-agent sessions, terminals, diff viewers, pull requests, documentation, dashboards and localhost servers. Developers can organize these tabs into project-oriented Spaces and worktree-based tab groups.
Radius is designed to support parallel development workflows. Agents can work in separate worktrees while developers keep related code, terminal output, documentation, PRs and local applications accessible in the same workspace. The product also provides a CLI for scripting browser windows, tabs, groups, splits and other workspace operations.
The Radius CLI is available as the npm package @sandbox-technologies/radius-cli. The package supports macOS and Node.js 20 or newer and provides commands for controlling Radius windows, tabs and other browser workspace components.
Radius is built on Chromium, so websites and web applications behave similarly to those in a modern Chromium browser. The current product supports macOS only, with downloads available for Apple Silicon and Intel Macs.
The product follows a local-first architecture. Radius states that projects, source code, worktrees, browser state, terminal sessions, chat history and agent state are stored locally on the user's device by default rather than routinely uploaded to a hosted copy. When users invoke an AI agent or cloud-backed integration, relevant information may be transmitted to the selected provider.
Software Category
Developer & Software Development
Pricing Model
Free
Product Type
saas
Starting Price
USD $0.00
Radius Features
✓
Key Feature
Free pricing model with a starting price of $0.00 USD.
✓
Key Feature
Integrates web browsing, coding agents (Claude Code, OpenAI Codex, Cursor Agent), terminals, pull requests, documentation, localhost applications, diffs, and project workspaces into one browser interface.
✓
Key Feature
Supports running AI coding agents directly inside browser tabs using existing accounts and subscriptions.
✓
Key Feature
Enables parallel development workflows through worktree-based tab groups and project-oriented Spaces.
Radius Pricing
Billing Model: Free
View Official Pricing →
USD $0.00 / starting
Check the official vendor site for volume discounts, regional tiers, and enterprise terms.
Radius Pros and Cons
✓ Key Strengths (Pros)
- • Free pricing model with a starting price of $0.00 USD.
- • Integrates web browsing, coding agents (Claude Code, OpenAI Codex, Cursor Agent), terminals, pull requests, documentation, localhost applications, diffs, and project workspaces into one browser interface.
- • Supports running AI coding agents directly inside browser tabs using existing accounts and subscriptions.
- • Enables parallel development workflows through worktree-based tab groups and project-oriented Spaces.
⚠ Considerations & Limitations (Cons)
- • No user reviews or ratings are available (review count = 0).
- • Only a Chromium-based browser is described; support for other browsers is not mentioned.
- • Product is offered as a free SaaS with no details on premium features or advanced capabilities.