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First agent in production. You can replay a bad run, not argue about it.

AI Agent Hub

LangGraph holds the graph. LangSmith shows the trace. Braintrust blocks a prompt change that quietly got worse. Modal runs the jobs. Relevance is there so ops can build helpers without opening a ticket.

Layers
01

5

 

Average score
02

83/100

 

Free tier
03

5of 5

 

Budget
04

$300 to $1,200 / mo

 

Team
05

1 to 3 engineers, one owner

 

[ 01 ]  Layer by layer

The tool, and why it is in this set.

  1. Layer 01

    Orchestration

    LangGraph

    LangGraph

    AI AgentsOpen sourceFrom $0

    Explicit state and durable checkpoints. A failed run can be replayed instead of guessed at.

    Full reviewWebsite
    82/100
  2. Layer 02

    Observability

    LangSmith

    LangSmith

    AI InfraFreemiumFrom $0

    Every model and tool call is a trace. A production miss becomes a regression test in one step.

    Full reviewWebsite
    84/100
  3. Layer 03

    Evaluation

    Braintrust

    Braintrust

    AI InfraFreemiumFrom $0

    A CI gate so a prompt edit cannot ship on vibes.

    Full reviewWebsite
    82/100
  4. Layer 04

    Compute

    Modal

    Modal

    AI InfraUsage-basedFrom $0 + compute

    Tool workloads and batch jobs on demand. No cluster to babysit.

    Full reviewWebsite
    85/100
  5. Layer 05

    Ops surface

    Relevance AI

    Relevance AI

    AI AgentsFreemiumFrom $0

    Supporting agents for the business team, without adding work to engineering.

    Full reviewWebsite
    82/100

[ 02 ]  Other stacks

Different job, different set.

All stacks→
01$120 to $600 / mo

Automation Stack

n8n for the volume. Zapier only for the connector nobody else has.

02$0 to $400 / mo

B2B SaaS starter

Under 15 people. Free tiers that actually work.

03$150 to $800 / mo

Ops, no engineers

Nothing here needs a repo, a deploy, or someone's afternoon in GitHub.

04$400 to $2,500 / mo

Revenue signal

Clay in front of the CRM. Cap credits and domains in week one.

05$80 to $450 / mo

Lean AI support

The agent takes first contact. Plain, Notion, PostHog and Linear do the rest.