Key takeaways
- Free native Swift Mac app with no sign-up required, supporting Claude Code, Codex, Gemini, and more
- Each agent runs in isolated git worktrees with dedicated Ghostty or SwiftTerm sessions
- Integrated agentic code review using Claude, Codex, or CodeRabbit before merge
FAQ
What is Agentastic?
Agentastic.dev is a terminal-first Mac IDE that runs multiple AI coding agents in parallel, each in isolated git worktrees with native diff viewing and agentic code review.
Is Agentastic free?
Yes, Agentastic is completely free with no sign-up required. You pay agent vendors (Anthropic, OpenAI) directly for agent subscriptions or API access.
What agents does Agentastic support?
Agentastic supports Claude Code, Codex, Droid, OpenCode, Amp, Gemini, and any terminal-based agent.
Executive Summary
Agentastic.dev is a terminal-first Mac IDE designed for developers running multiple AI coding agents simultaneously. Built natively in Swift, it provides each agent with an isolated git worktree and dedicated terminal session (Ghostty or SwiftTerm), plus integrated diff viewing and agentic code review capabilities.
| Attribute | Value |
|---|---|
| Company | Agentastic |
| Founded | 2025 |
| Funding | Unknown (appears bootstrapped) |
| Employees | Small team |
| Headquarters | Unknown |
Product Overview
Agentastic targets "10x engineers" who run multiple coding agents in parallel. Unlike simple agent wrappers, Agentastic provides a full development environment with native file editing, worktree management, and code review workflows—positioning itself as an IDE built around agents rather than an agent added to an IDE.
The core insight is that parallel agent work requires isolation. Git worktrees provide that isolation at the file system level, and Agentastic makes worktree management seamless while providing each agent its own terminal environment.
Key Capabilities
| Capability | Description |
|---|---|
| Parallel Agents | Run Claude Code, Codex, Gemini, and more simultaneously |
| Worktree Isolation | Each agent operates in its own git worktree |
| Native Terminals | Choice of Ghostty or SwiftTerm per worktree |
| Agentic Code Review | AI-powered review via Claude, Codex, or CodeRabbit |
| Built-in Diff Viewer | Native diff and merge tools |
| Fast Code Search | Cmd+P fuzzy finder for files, symbols, and lines |
Product Surfaces
| Surface | Description | Availability |
|---|---|---|
| macOS App | Native Swift application | GA (0.5.14+) |
Technical Architecture
Agentastic is built natively in Swift for optimal Mac performance. It integrates with Ghostty, a GPU-accelerated terminal emulator, for agent sessions. Worktree creation and management is handled automatically—developers add their repo, and Agentastic handles the git worktree lifecycle.
Key Technical Details
| Aspect | Detail |
|---|---|
| Deployment | Local Mac app |
| Language | Swift (native macOS) |
| Terminal Options | Ghostty or SwiftTerm |
| Worktree Location | Local (managed by app) |
| Open Source | No |
How It Works
- Add your git repo — Agentastic handles worktree creation and management
- Deploy agents — Each worktree gets dedicated Ghostty terminals; run any CLI agent
- Review code — Built-in diff viewer and optional agentic code review before merge
Strengths
- Terminal-first philosophy — Real terminal sessions (Ghostty) rather than pseudo-terminals; full CLI power per agent
- Automatic worktree isolation — No manual worktree management; each agent gets true filesystem isolation
- Completely free — No subscription, no sign-up, no usage limits on the app itself
- Agent-agnostic — Supports any terminal-based agent including Claude Code, Codex, Droid, OpenCode, Amp, and Gemini
- Agentic code review — Unique feature: AI reviews agent code before merge using Claude, Codex, or CodeRabbit
- Native Mac performance — Swift codebase optimized for macOS; feels responsive and native
Cautions
- Mac-only — Requires macOS 14.0 (Sonoma) or later; no Windows or Linux support
- Closed source — No visibility into codebase or ability to self-host
- Early extensibility — Extensibility is "on the roadmap" but not yet available
- Learning curve — Worktree-based workflow may be unfamiliar to developers used to single-branch development
- Unknown monetization — Free model raises questions about long-term sustainability
Pricing & Licensing
| Tier | Price | Includes |
|---|---|---|
| Free | $0 | Full app, unlimited worktrees, all features |
Licensing model: Free closed-source app; BYOK for agents
Hidden costs: Agent subscriptions (Claude Code, Codex, etc.) or API access are paid separately to vendors
Competitive Positioning
Direct Competitors
| Competitor | Differentiation |
|---|---|
| Acepe | Agentastic provides terminals + worktrees; Acepe focuses on ACP protocol |
| Commander AI | Agentastic is terminal-first with worktrees; Commander is prompt→diff→commit workflow |
| Auto-Claude | Agentastic is for parallel manual orchestration; Auto-Claude is for autonomous execution |
When to Choose Agentastic Over Alternatives
- Choose Agentastic when: You want full terminal access per agent with worktree isolation
- Choose Acepe when: You prefer a lighter-weight multi-agent interface without full IDE
- Choose Auto-Claude when: You want autonomous multi-agent execution with a Kanban interface
Ideal Customer Profile
Best fit:
- Developers comfortable with terminal-based workflows
- Teams running multiple agents on the same codebase simultaneously
- Engineers who value worktree-based branch isolation
- Power users who want Ghostty integration
Poor fit:
- Developers preferring GUI-only interfaces
- Teams needing Windows or Linux support
- Users wanting fully autonomous agent orchestration
Viability Assessment
| Factor | Assessment |
|---|---|
| Financial Health | Unknown (free model) |
| Market Position | Strong (differentiated) |
| Innovation Pace | Active development |
| Community/Ecosystem | Growing |
| Long-term Outlook | Positive if sustainable |
The free model and strong feature set suggest either venture backing, a planned premium tier, or a passion project. The product quality indicates serious development investment.
Bottom Line
Agentastic.dev is the most terminal-native option in the Mac coding agent app space. Its combination of worktree isolation, Ghostty integration, and agentic code review creates a compelling workflow for developers who want agent power without giving up terminal control.
Recommended for: Terminal-oriented developers running multiple agents who want worktree isolation and native Mac performance
Not recommended for: Developers preferring visual IDEs, Windows/Linux users, or those seeking fully autonomous agent orchestration
Outlook: Strong product-market fit for terminal-first developers; sustainability of free model is the main question
Research by Ry Walker Research • methodology