Agentastic vs T3 Code
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T3 Code is a free, MIT-licensed control surface for coding agents: a server on your machine wraps the Claude Code, Codex, Cursor, Grok Build, OpenCode, and Antigravity CLIs, plus ACP Registry agents, and you drive them from an Electron desktop app, the web, or iOS and Android apps. Agentastic is a free, native macOS workspace that runs 53 agents, each in a worktree, container, SSH host, or cloud VM, with scheduled agents, Manager Agents, and AI review built in. Pick T3 Code for open source and every platform; pick Agentastic for a native Mac app and the loop around the agents.
Who should choose each option
Agentastic
Choose Agentastic if you work on a Mac, run many different agents, want a container, SSH host, or cloud VM per task, and want scheduling, Manager Agents, and AI review passes in the same native app.
T3 Code
Choose T3 Code if open source matters, you work across macOS, Windows, and Linux or want web and Android clients, or you host your agents on one machine and reach it from several devices.
Feature comparison
| Agentastic | T3 Code | |
|---|---|---|
| What it is | Native macOS workspace for many CLI agents (Swift) | Open-source control surface over a local agent server (Electron desktop app) |
| Platforms | macOS 14+ (Apple Silicon and Intel) | macOS, Windows, Linux; web; iOS and Android |
| License and price | Free; closed source | Free; MIT |
| Agents | 55 built-in definitions, including review agents, plus any terminal command | Claude Code, Codex, Cursor, Grok Build, OpenCode, Antigravity, and ACP Registry agents |
| Interface | Native terminal or structured chat, plus editor, browser, and diff viewer | Chat threads with terminals and diffs |
| Parallel isolation | Git worktree, Docker or Apple container, SSH host, or cloud VM per task | Optional git worktree per thread on the server machine |
| Remote and cloud | SSH hosts; cloud VMs on your own Modal, Fly.io, or Vercel Sandbox account | Run the server on any machine you keep online; reach it with T3 Connect |
| Review | Diff viewer plus review passes by Claude, Codex, CodeRabbit, or Greptile | Diff controls; pull requests through GitHub, GitLab, and other hosts |
| Automation | Scheduled agents with memory, Manager Agents, dev CLI, Linear and Sentry intake | MCP server so outside agents can drive T3 Code; handoffs between providers |
| Phone | iPhone Companion, public beta on TestFlight | iOS and Android apps |
Pricing
Agentastic
Free. You pay your agent providers directly with the subscriptions or API keys you already have.
T3 Code
Free and open source under the MIT license. It doesn't resell tokens; agents run on your own subscriptions or keys.
Using them together
Both drive the same agent CLIs with the same sign-ins, so you can try either without changing your agents. A common split is T3 Code for reaching a Linux box from a phone or browser, and Agentastic on your Mac for parallel tasks in containers or cloud VMs with review passes before you merge.
Frequently asked questions
Is Agentastic a good T3 Code alternative?
On a Mac, yes: Agentastic is native rather than Electron, runs 55 built-in agent definitions, and adds containers, SSH hosts, cloud VMs, scheduled agents, and Manager Agents. It isn't open source and has no Windows, Linux, web, or Android client. See T3 Code alternatives for other options.
Is T3 Code open source?
Yes. T3 Code is MIT-licensed on GitHub. The maintainers say they are mostly not accepting contributions yet and encourage forks instead. Agentastic is free but closed source.
Does T3 Code use git worktrees?
Yes. A new thread can start in a new worktree, or several threads can share one, on the machine running the T3 Code server. Agentastic creates a worktree for every task by default and can use a container, SSH host, or cloud VM instead.
Which agents does T3 Code support?
Codex, Claude Code, Cursor, Grok Build, OpenCode, and Google Antigravity, plus agents from the ACP Registry such as Pi. Agentastic's built-in list includes those and dozens more, including review agents like CodeRabbit and Greptile.
Can I control agents from my phone with either app?
Yes. T3 Code has iOS and Android apps that connect to your server through T3 Connect. Agentastic's iPhone Companion pairs with your Mac over an end-to-end-encrypted connection to watch agents, answer questions, review diffs, and merge PRs; it is a public beta on TestFlight.
Which one works on Windows or Linux?
T3 Code: its desktop app runs on macOS, Windows, and Linux. Agentastic is macOS only, though it can run agents on Linux machines over SSH or in cloud VMs.
Further reading
- Best T3 Code alternatives — eight tools, from native Mac apps to open-source picks
- Best Claude Code GUI apps for Mac — first-party and third-party apps compared
- Best Codex GUI and desktop apps — OpenAI's app, Agentastic, Conductor, and more
- Loop engineering — what to build around agents once they run in parallel
See also
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