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Symphony
A
Galileo AI
B
GitHub Copilot
B
Bolt.new (StackBlitz)
A
TaglineOpenAI's open-source daemon that turns your Linear board into an always-on coding agent factory — tickets go in, pull requests come out.Prompt to UI design. Figma-ready outputs.Microsoft/GitHub's autocomplete. Deep VS Code + JetBrains integration.Prompt to deployed full-stack app in the browser.
CategoryAgentsDesignCodingCoding
PricingFree (open-source)Free trial + paid plansFree (limited) + $10/mo Pro + $19/mo BusinessFree + $20-$200/mo
Best forEngineering teams already using Linear + OpenAI Codex who want to stop babysitting agent sessions and instead let the issue tracker drive autonomous coding at scale.Designers brainstorming first drafts.Teams with GitHub already. Devs who don't want to change IDEs.PMs, founders, non-devs shipping MVPs.
Strengths
  • Fully autonomous ticket-to-PR pipeline: every open Linear issue gets its own isolated Codex agent without manual supervision
  • Fault-tolerant Elixir/OTP architecture automatically restarts crashed agents and manages hundreds of concurrent runs
  • WORKFLOW.md keeps all orchestration policy version-controlled inside the repo, so agent behavior is reproducible and reviewable like code
  • Proven internal results: OpenAI reported a 500% increase in landed PRs on some teams within three weeks
  • Open spec encourages community re-implementations in any language, not just Elixir
  • Prompt-to-UI with real layouts
  • Exports to Figma
  • Faster than hand-designing from scratch
  • Great enterprise story
  • Works in your existing IDE
  • Chat + autocomplete
  • Full-stack generation + live preview
  • Deploy to Netlify in one click
  • Works in-browser — no install
Weaknesses
  • Currently only supports Linear as an issue tracker — GitHub Issues and Jira integrations are not yet official
  • Only OpenAI Codex is officially supported as the agent runtime; other model integrations are community-contributed and incomplete
  • Self-hosted, Elixir-dependent engineering preview with no built-in sandboxing — not suitable for untrusted or production environments out of the box
  • Output needs designer polish
  • Pricing unclear / changes often
  • Less agentic than Cursor/Claude Code
  • Model quality varies
  • Quality ceiling for complex apps
  • Can get into loops for non-trivial bugs
Kai's verdictSymphony is the most architecturally serious 'issue tracker as control plane' approach yet — 15K GitHub stars in weeks confirms the idea resonates — but it's still a rough, self-hosted engineering preview that demands Elixir chops and a Linear-only workflow. (Verdict pending Phi's full review.)B-tier. Useful for first drafts. v0 is the better bet for shipping code.B-tier. Solid for autocomplete but the category moved past it. Pick Cursor unless you can't.A-tier. Best for fast prototypes. Competitive with Lovable — try both.
LinkOpen →Open →Open →Open →