Stack guide · updated 2026-10-19
Best stack for an AI agent
Checked Oct 2026For a developer shipping an agent that calls tools, keeps state and runs reliably in production.
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The stack at a glance
| Layer | Pick | Starting price | Our status | Try |
|---|---|---|---|---|
| AI editor | Cursor | Free; paid from $8/mo (Plus) (source, checked 2026-10-19) | Community-verified | Visit ↗ |
| Agent framework | LangGraph | Free open-source library (MIT); LangSmith Plus $39/seat/mo (source, checked 2026-10-19) | Community-verified | Visit ↗ |
| LLM API | OpenRouter | Free tier (25+ free models); pay-as-you-go with 5.5% platform fee (source, checked 2026-10-19) | Not yet reviewed | Visit ↗ |
| Code sandbox | E2B | Hobby free ($100 one-time credit); Pro $150/mo + usage (source, checked 2026-10-19) | Not yet reviewed | Visit ↗ |
| Memory / database | Supabase | Free; Pro from $25/mo (source, checked 2026-10-19) | Community-verified | Visit ↗ |
| Automation / triggers | n8n | Check pricing on the official site | Community-verified | Visit ↗ Affiliate |
| Hosting | Railway | Free ($1/mo credit); Hobby $5/mo (source, checked 2026-10-19) | Community-verified | Visit ↗ Affiliate |
Each pick, and why
Cursor
Why: Repo-aware edits speed up agent code.
+ Strong tab completion and repo-aware multi-file edits
− Still breaks code without small tasks and review
Status: Community-verified · Alternatives: Windsurf
LangGraph
Why: Free MIT library for stateful, controllable agents; the usual pick when reliability matters.
+ Free MIT library for stateful, controllable agents
− Steeper learning curve
Status: Community-verified · Alternatives: OpenAI Agents SDK, Mastra
OpenRouter
Why: One key for many models, so you can swap models per task.
+ One API for many models, with 25+ free models
− 5.5% platform fee on pay-as-you-go
Status: Not yet reviewed · Alternatives: OpenAI, Anthropic API
E2B
Why: Run agent-generated code in isolated sandboxes; free Hobby credit.
+ Sandboxes for running agent-generated code; free Hobby credit
− Pro is $150/mo + usage
Status: Not yet reviewed
Supabase
Why: Postgres for agent state, users and logs on a free tier.
+ Postgres database plus auth, storage and a free tier
− See community sources (Supabase vs Clerk) for auth trade-offs
Status: Community-verified · Alternatives: Firebase
n8n
Why: Open-source workflows to trigger agents from apps and schedules.
+ Open-source automation; popular for self-hosting
− More technical than Make or Zapier
Railway
Why: Runs long-lived servers and workers that agents often need.
+ Simple hosting for servers, workers and databases
− Free tier is only a $1/mo credit
Status: Community-verified · Alternatives: Vercel
FAQ
What is the best framework for an AI agent?
LangGraph is a free MIT library suited to stateful, controllable agents. The OpenAI Agents SDK is a lighter free option, and Mastra suits TypeScript teams.
No-code option for an AI agent?
n8n lets you build agent workflows visually; Make and Zapier are alternatives.
Where should I host an agent?
Agents often need long-running processes, which Railway runs (free tier is a $1/mo credit, Hobby $5/mo). Vercel fits the web frontend.
More: Build My Stack · All stack guides · Comparisons · All tools
How we label tools: "Tried it" means we tested it; "Community-verified" means builder feedback we cite backs it; "Not yet reviewed" means neither yet. Strengths and weaknesses come from cited community sources or official pages, not our own tests.