Compare AI tools

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