Agentastic
Terminal-first, native macOS “multi-agent IDE” that runs many coding agents in parallel, each in its own git worktree or container. Made by “Agentastic” (agentastic.dev; GitHub org agentasticai, created 2025-02-10). Free to use, no sign-up (site FAQ); the vendor’s llms.txt states it is proprietary and closed source (the org’s public repos are forks and libraries such as SwiftTerm). You still pay your own agent/provider subscriptions; hosted models and relay services are optional.
- Platform: macOS 14+ (Apple Silicon and Intel), no Windows or Linux desktop app; an iPhone companion app is in public beta on TestFlight (iOS 18+); a CLI (
dev) is also available for macOS/Linux/WSL via install script or Homebrew (site FAQ). Mac-only app matches the community tier-list blurb (“many agents built in, Mac only”; B tier, opinion). - Agents: the site says 55 built-in agent definitions (examples on the site: Prime Agent, Claude Code, Codex, Poolside, Gemini, Grok Build, OpenClaw; the full list was not checked) plus an Agentastic coding agent. Works with any terminal agent.
- Features: isolated worktrees/containers per agent, Ghostty/SwiftTerm terminals, native editor, diff view and agentic code review, integrated browser with Design Mode, remote execution over SSH and cloud platforms, iPhone companion app, manager agents, integrations (GitHub, Linear, Jira, Slack, Notion, Sentry).
- Maturity: release notes list v0.13.3 released 2026-10-07 (https://www.agentastic.dev/whats-new); pre-1.0. First public announcement found: a Show HN post by HN user ahmadyan on 2026-01-05 (“Agentastic.dev is Ghostty and Git worktrees = multi-agent CC/Codex IDE”).
- Compare: Traycer (cross-platform, open source), Maestri (canvas UI), Agent Orchestrator (open source, CI feedback loop).
Open items
- Legal entity and founders: not stated on the site (no terms or about page; /terms, /privacy, /about return 404); the HN poster’s relationship to the company is not stated. Tier-list placement (B) is community opinion. llms.txt names Claude Code, Codex, Gemini CLI, Cursor, GitHub Copilot, OpenCode, CodeRabbit and Greptile among the 55 built-in definitions; the full list is at /agents.
Sources
- https://www.agentastic.dev/ (fetched 2026-10-05 and 2026-10-07: macOS 14+, Apple Silicon and Intel, free, 55 agents, version 0.13.3, SSH/Modal/Fly/Vercel, iPhone app, Design Mode, CLI)
- https://api.github.com/orgs/agentasticai/repos (2026-10-07)
- https://www.agentastic.dev/llms.txt , /whats-new , /sitemap.xml (fetched 2026-10-08)
- https://news.ycombinator.com/item?id=46501758 (HN API, fetched 2026-10-08)
- Search summary of agentastic.dev / rywalker.com / macaiapps.com (2026-10-05, secondary)