The AI Agent Index

Viktor

by Zeta AI, Inc.

★4.3

Slack and Microsoft Teams AI coworker that connects to 3,200+ tools, writes and runs code, and delivers finished PDFs, dashboards, and web apps. $100 in free credits, then from $50/mo for 20,000 credits (USD).

Klaviyo AI

by Klaviyo

★4.6

Klaviyo AI powers ecommerce marketing with Composer (AI campaign agent), Customer Agent (65% autonomous resolution, vendor-claimed), and predictive analytics. Free plan, with paid email from $20/month.

HubSpot Sales Hub

by HubSpot

★4.5

HubSpot's sales platform with Breeze AI agents for prospecting, deal coaching and support, plus two official MCP servers and an MCP client. Free tier, Starter from $7/seat/mo annual.

Make.com

by Celonis (Make)

★4.6

Visual workflow automation with advanced branching and data manipulation across 3,000+ apps. MCP server and client included. Free tier, with Core from $9/mo billed annually or $10.59 monthly.

Apollo.io

by Apollo

★4.7

B2B sales intelligence with 240M+ contacts, AI sequencing, and autonomous outreach. Free plan, with paid tiers from $49/user/mo billed annually or $65 monthly. Over 600,000 companies.

Close CRM

by Close

★4.6

Inside-sales CRM with built-in calling, SMS, email, and Chloe AI sales agent on every plan. Solo $9, Essentials $35, Growth $99, Scale $139/seat/mo billed annually. 100+ integrations.