Agent infrastructure tools to make agents reliable in production
AI engineering tools for tracing, evaluating, connecting, and remembering what agents do before they touch real customers or business systems. Each one below shows its real entry price for a one-person team and an honest take on whether you need a developer to run it.
8 agents · 8 solo-founder ready
Arcade.dev
Agent Infrastructure
MCP-compatible tool-calling infrastructure with auth, hosted tools, and usage-based pricing for agent builders.
- Entry price
- Free Hobby; Growth $25/mo plus usage
- No-code
- 2/5
Arize Phoenix
Agent Infrastructure
Free open-source observability and evaluation for LLM apps, with Arize's paid platform when you outgrow it.
- Entry price
- Free open source; Arize AX Pro from $50/mo
- No-code
- 2/5
Braintrust
Agent Infrastructure
Evals and observability for teams shipping real AI agents, with a free starter path and serious paid tier.
- Entry price
- Free Starter; Pro $249/mo plus usage
- No-code
- 2/5
Composio
Agent Infrastructure
Tool access, auth, and integrations for AI agents that need to take real actions across apps.
- Entry price
- Free 20K tool calls/mo; paid from $29/mo
- No-code
- 2/5
Helicone
Agent Infrastructure
LLM observability and AI gateway for tracking requests, costs, latency, and production behavior.
- Entry price
- Free Hobby; Pro $79/mo plus usage
- No-code
- 3/5
Langfuse
Agent Infrastructure
Open-source LLM observability and evals for builders who want traces, prompts, datasets, and cost visibility.
- Entry price
- Free Hobby; Core $29/mo plus usage
- No-code
- 2/5
LangSmith
Agent Infrastructure
LangChain's tracing, eval, deployment, and monitoring platform for builders shipping agents.
- Entry price
- Free Developer; Plus $39/seat/mo plus usage
- No-code
- 2/5
Letta
Agent Infrastructure
Stateful agent platform from the MemGPT team, built around persistent memory and long-running agents.
- Entry price
- Free tier; Pro $20/mo; API plan $20/mo plus usage
- No-code
- 2/5