Compare AI tools

	Replit Agent A	Symphony A	Perplexity S
Tagline	Replit's AI that builds + deploys full apps on their platform.	OpenAI's open-source daemon that turns your Linear board into an always-on coding agent factory — tickets go in, pull requests come out.	AI search done right. Cited answers, not chat theater.
Category	Coding	Agents	Research
Pricing	$10-$25/mo Core/Teams	Free (open-source)	Free + $20/mo Pro
Best for	Teachers, students, prototypers, hackathon builders.	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.	Replacing Google for any question where you want a cited answer in seconds.
Strengths	Full-stack + DB + auth + deploy in one environment Great for teaching/learning Runs everything in-browser	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	Sources every claim Fast, current answers Pro Search runs multi-step research Spaces for persistent context
Weaknesses	Locked into Replit hosting Less code quality than dedicated IDEs	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	Not a general chatbot Answers can be shallow on complex topics
Kai's verdict	A-tier. Best for teaching a kid to code in 2026.	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 search. I use it before Google now. If you're still Googling everything, try this for a week.
Link	Open →	Open →	Open →