Compare AI tools

	Symphony A	Midjourney S	GitHub Copilot B	Lex A
Tagline	OpenAI's open-source daemon that turns your Linear board into an always-on coding agent factory — tickets go in, pull requests come out.	The aesthetic gold standard for AI image generation.	Microsoft/GitHub's autocomplete. Deep VS Code + JetBrains integration.	Google Docs with an AI collaborator baked in.
Category	Agents	Image	Coding	Writing
Pricing	Free (open-source)	$10-$120/mo	Free (limited) + $10/mo Pro + $19/mo Business	Free + $12/mo
Best for	Engineering teams already using Linear + OpenAI Codex who want to stop babysitting agent sessions and instead let the issue tracker drive autonomous coding at scale.	Anyone who wants beautiful images without thinking about prompts.	Teams with GitHub already. Devs who don't want to change IDEs.	Essays, long-form drafts, thinking on the page.
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	Best-in-class art direction v7 is stunning Great style consistency	Great enterprise story Works in your existing IDE Chat + autocomplete	Clean writing UX — distraction-free +++ prompt triggers AI help Collaboration + AI feedback together
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	No free tier Discord-first UX (web now available) Less controllable than ComfyUI	Less agentic than Cursor/Claude Code Model quality varies	Less feature-rich than Google Docs AI ceiling below dedicated tools
Kai's verdict	Symphony 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.)	S-tier for aesthetics. If you care how it looks more than how it's made, this wins.	B-tier. Solid for autocomplete but the category moved past it. Pick Cursor unless you can't.	A-tier. Beautiful UX. The writing app I'd pick if I only wrote long-form.
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