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Symphony
A
Ollama
S
GitHub Copilot
B
Hume AI
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.Run LLMs locally. One-line install, GUI optional.Microsoft/GitHub's autocomplete. Deep VS Code + JetBrains integration.Voice AI that reads + expresses emotion.
CategoryAgentsDev PlatformCodingVoice
PricingFree (open-source)Free + open sourceFree (limited) + $10/mo Pro + $19/mo BusinessFree tier + pay-as-you-go
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.Devs wanting offline/local LLMs for privacy or experimentation.Teams with GitHub already. Devs who don't want to change IDEs.Therapy apps, customer service, any voice agent where emotion matters.
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
  • Run Llama, Mistral, Qwen, etc. on your laptop
  • Simple CLI + API
  • Hardware-aware (picks the right quant)
  • Great enterprise story
  • Works in your existing IDE
  • Chat + autocomplete
  • Detects + mirrors emotional tone
  • EVI (Empathic Voice Interface) feels different
  • Expressive voice output
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
  • Needs beefy laptop for larger models
  • Speed way behind cloud APIs
  • Less agentic than Cursor/Claude Code
  • Model quality varies
  • Niche use case
  • Pricing ramps fast
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.)S-tier for local inference. If you care about privacy or want to tinker, install this today.B-tier. Solid for autocomplete but the category moved past it. Pick Cursor unless you can't.A-tier in its niche. The only one that actually gets emotion right.
LinkOpen →Open →Open →Open →