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

Lean AI support

A small product-led team: the agent takes web chat and WhatsApp, Plain keeps the handoff as a real conversation, Notion is the corpus it is allowed to know, PostHog shows what the customer actually hit, and Linear turns the rest into issues. If the wiki is stale, none of this works.

Layers
01

5

 

Average score
02

83/100

 

Free tier
03

4of 5

 

Budget
04

$80 to $450 / mo

 

Team
05

1 to 4 support, no platform engineer

 

[ 01 ]  Layer by layer

The tool, and why it is in this set.

  1. Layer 01

    Agent and inbox

    YourGPT

    YourGPT

    AI AgentsSubscriptionFrom $39/mo

    Web chat and WhatsApp, thread kept on handoff, learns from the replies your team sends. Buy Professional so Studio is on. Stay off frontier models until credits are understood.

    Full reviewWebsite
    86/100
  2. Layer 02

    Human thread

    Plain

    Plain

    SupportSubscriptionFrom $0

    When the agent cannot close it, a proper thread. Especially if customers already live in Slack.

    Full reviewWebsite
    77/100
  3. Layer 03

    Corpus

    Notion

    Notion

    ProductivityFreemiumFrom $0

    What the agent indexes. Stale docs mean a pretty agent that still fails.

    Full reviewWebsite
    83/100
  4. Layer 04

    The actual bug

    PostHog

    PostHog

    DataUsage-basedFrom $0

    Replay beside the conversation. Skip the customer's reconstruction.

    Full reviewWebsite
    84/100
  5. Layer 05

    Bugs

    Linear

    Linear

    ProductivityFreemiumFrom $0

    Defects leave support as issues, not a spreadsheet.

    Full reviewWebsite
    84/100

[ 02 ]  Other stacks

Different job, different set.

All stacks→
01$300 to $1,200 / mo

AI Agent Hub

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

02$120 to $600 / mo

Automation Stack

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

03$0 to $400 / mo

B2B SaaS starter

Under 15 people. Free tiers that actually work.

04$150 to $800 / mo

Ops, no engineers

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

05$400 to $2,500 / mo

Revenue signal

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