Relevance AI vs Stack AI (2026): which should you pick?

Pick Relevance AI if

• Fits if your sales or support team wants research, outreach and CRM updates done by agents
• Works for organizations that want to bring their own model API keys

Look elsewhere if

• Not for you if you want to try before you pay, as the Free plan has been retired and no trial is listed
• Pricey if your agents are busy, since extra Actions cost $80 per 1,000 and plan Actions reset at renewal
• Skip it if you need calling or meeting agents on a budget, because they start at Team, from $234 a month
• Skip it if you need SSO, RBAC or audit logs, which are Enterprise only
• Watch out: the website's pricing page lists only Enterprise, and Pro and Team prices are in the docs

Pick Stack AI if

• Fits if you want to build one or two agents and try them free
• Makes sense if you plan to ask for an enterprise deployment later

Look elsewhere if

• Tight if you work in a team, as Free is 1 seat and 2 projects
• Not for you if you want a self-serve paid plan, because none is published
• Watch out: SSO, access control, VPC and on-prem are Enterprise only
• Watch out: the homepage says Asana acquires StackAI, so ownership and plans may change

Relevance AI

• The Free plan has been retired for new and existing accounts, so every organization needs a paid plan.
• Plan Actions reset at each renewal, and extra Actions cost $80 per 1,000.
• Calling and meeting agents and the analytics dashboard start at Team; SSO, RBAC and audit logs are Enterprise only.
• The website's pricing page lists only Enterprise; Pro and Team prices are published in the documentation.

Stack AI

• Only a Free plan and a custom Enterprise plan are listed; there is no published self-serve paid tier.
• The free plan has 1 seat, 2 projects and 500 runs a month.
• SSO, access control, VPC, on-prem and BAA are Enterprise features.
• Its homepage says Asana acquires StackAI, so plans and ownership may change.

Relevance AI

Agents and Tools

Agents complete tasks on their own using Tools, which are assembled in a no-code builder from API calls, LLM prompts and custom code. Both are unlimited on every plan.

Workforces

A visual canvas connects specialist agents into a team, with AI-driven handoffs, fixed sequences or conditional logic deciding how work moves between them.

Invent

A built-in agent that works through a business process with you, then creates the Agents, Tools, Triggers and Workforces for it and proposes improvements after launch.

Chat on web and mobile

Agents and Workforces can be @mentioned in a chat interface at chat.relevanceai.com, in a desktop app, and in native Android and iOS apps.

Integrations and triggers

Native integrations ship with ready-made actions and triggers, and a Pipedream connection extends the catalog to 2,000+ services. Custom API calls cover the rest.

Actions and Vendor Credits

Plans count Actions, one each time an agent runs a Tool, separately from Vendor Credits, which pass model and tool costs through with no markup.

Stack AI

Agent and flow builder

The comparison table lists Agents and Flow modules, with Python and JavaScript code steps for custom logic.

Multi-modal inputs

Agents take text, image, audio and video inputs and return text, image or audio, with vision and speech modules.

Knowledge bases and data loaders

Load documents (PDF, Word, PowerPoint), web scrapes, Google Drive and Notion content into a knowledge base.

Ways to ship an agent

Deploy through a REST API, a Chrome extension or a Slack bot; custom domains and analytics are listed.

Security and deployment options

Enterprise offers SSO, access control, VPC and on-premise deployment, and the page claims SOC 2, HIPAA and GDPR compliance.

Relevance AI

• Pro$19

  per month, billed annually; $29 billed monthly

  2,500 Actions and $20 of Vendor Credits a month, unlimited agents, tools and workforces, 2 build users, 1 project and your own API keys.

• Team$234

  per month, billed annually; $349 billed monthly

  7,000 Actions and $70 of Vendor Credits a month, 5 build users, 45 end users, 5 shared projects, calling and meeting agents and priority support.

• EnterpriseCustom

  Custom Actions and Vendor Credits, unlimited users and projects, agent evaluations, SSO, RBAC, audit logs and a dedicated account manager.

Stack AI

• Free plan$0

  500 runs per month, 2 projects, 1 seat and community support on Discord.

• EnterpriseCustom

  Custom runs and seats, unlimited projects, dedicated infrastructure, SSO, VPC or on-prem deployment.

Relevance AI

• Annual discount

  Save 33% with annual billing

  Relevance AI's documentation says annual billing saves 33% over the monthly rate: Pro is $19 a month instead of $29, and Team is $234 instead of $349.

Stack AI

No public discounts listed.