Every score is worked out from the vendor's own pages · How we score →Disclosure
SAASINSPECTOR
Head-to-head · AI agent builders · facts checked 13 Sept 2026

Relevance AI vs StackAI

StackAI scores 8.4 to Relevance AI's 8.2 among the AI agent builders we rate, and is the better pick for 2 of the 4 kinds of buyer below.

Relevance AI
#3 of 12 AI agent builders
8.2
/ 10
From
$29/mo, Pro
Free plan
Not publicly stated
StackAI
#2 of 12 AI agent builders
8.4
/ 10
From
$0/mo, Free
Free plan
Yes
The verdict

StackAI wins, 8.4 to 8.2

StackAI has a standing free plan; Relevance AI does not offer one to new signups. StackAI can also be self-hosted, deploying on-premise or into your own VPC, and it moves agents through four separate stages from development to production; Relevance AI offers neither self-hosting nor separate test and live environments. StackAI also holds HIPAA compliance with a signable BAA, which Relevance AI does not claim. Relevance AI connects to a stated 2,000 apps against StackAI's 100.

Pick Relevance AI if you need far more app connectors to work with.

Pick StackAI if you need self-hosting, HIPAA compliance and a free plan.

Best for

Who each one suits, decided on the criteria that matter to that buyer and the checked facts where the two differ.

Solo builders and startups
StackAI
Relevance AI 8.0 · StackAI 9.4 on building workflows and pricing
  • Free plan: StackAI yes, Relevance AI no
Ops teams connecting many apps
Relevance AI
Relevance AI 8.0 · StackAI 5.9 on apps it connects to and reliability and control
  • App connectors: 2000 apps against 100 apps
  • But StackAI leads on separate test and live environments: StackAI yes, Relevance AI no
AI agent projects
Too close to call
Relevance AI 10.0 · StackAI 10.0 on ai agents
  • What agents can learn from: Relevance AI Files, website, google_drive, notion, StackAI Website, files, google_drive, notion
Enterprise IT and compliance
StackAI
Relevance AI 7.0 · StackAI 7.8 on hosting and security and support
  • Self-hosted edition: StackAI yes, Relevance AI no
  • HIPAA: StackAI yes, Relevance AI no
  • But Relevance AI leads on ways to reach support: Email, live_chat, community, slack against Community, email
Section 01

How they score

Both are scored the same way, against the other AI agent builders we rate, from facts on each vendor's own pages. StackAI leads on 3 of 7 criteria.

AI agents20% of the score
Relevance AI10.0
StackAI10.0
Building workflows20% of the score
Relevance AI10.0
StackAI10.0
Pricing20% of the score
Relevance AI6.0
StackAI8.8
Apps it connects to15% of the score
Relevance AI10.0
StackAI4.0
Reliability and control10% of the score
Relevance AI5.0
StackAI8.8
Hosting and security10% of the score
Relevance AI5.5
StackAI9.2
Support5% of the score
Relevance AI10.0
StackAI5.0
How the score works →
Section 02

Where they differ

Every point where the two vendors' published facts disagree, with a link to where each fact was read. "Not published" means the vendor does not say either way.

Free plan
StackAI
Relevance AI
No
source ↗
StackAI
Yes
source ↗
App connectors
Relevance AI
Relevance AI
2000 apps
source ↗
StackAI
100 apps
source ↗
Separate test and live environments
StackAI
Relevance AI
No
source ↗
StackAI
Yes
source ↗
Self-hosted edition
StackAI
Relevance AI
No
source ↗
StackAI
Yes
source ↗
HIPAA
StackAI
Relevance AI
No
source ↗
StackAI
Yes
source ↗
Ways to reach support
Relevance AI
Relevance AI
Email, live_chat, community, slack
source ↗
StackAI
Community, email
source ↗

Published by only one of them

What agents can learn from
Relevance AI
Files, website, google_drive, notion
source ↗
StackAI
Website, files, google_drive, notion
source ↗
Monthly price, cheapest paid plan
Relevance AI
$29
source ↗
StackAI
Not published
Cost of 1,000 five-step runs a month
Relevance AI
$29
source ↗
StackAI
Not published
Free trial
Relevance AI
Not published
StackAI
Does not apply
Run history kept on the cheapest plan
Relevance AI
90 days
source ↗
StackAI
Not published
Choice of data region
Relevance AI
Us, eu, uk, au
source ↗
StackAI
Not published
Where they match (8)
BYOK: bring your own model or key
Relevance AI
Yes
source ↗
StackAI
Yes
source ↗
Agents that work together
Relevance AI
Yes
source ↗
StackAI
Yes
source ↗
Test and evaluate agents
Relevance AI
Yes
source ↗
StackAI
Yes
source ↗
Visual builder
Relevance AI
Yes
source ↗
StackAI
Yes
source ↗
Branching and conditions
Relevance AI
Yes
source ↗
StackAI
Yes
source ↗
Webhook triggers
Relevance AI
Yes
source ↗
StackAI
Yes
source ↗
SOC 2
Relevance AI
Yes
source ↗
StackAI
Yes
source ↗
Does not train AI on your data
Relevance AI
Yes
source ↗
StackAI
Yes
source ↗
Section 03

Pricing, plan by plan

Every plan each vendor publishes, monthly and yearly where both are offered.

Relevance AI

Relevance AI does not publish a plan list we could read.

StackAI

Free
Free
500 runs/month, 2 projects, 1 seat, community Discord support
Enterprise
Custom
Custom runs, unlimited projects, custom seats, dedicated infrastructure, on-prem/VPC, SSO, SOC2/HIPAA/GDPR

For everything else about each tool, read the full Relevance AI review and StackAI review.

Section 04

Relevance AI vs StackAI: common questions

Which is better, Relevance AI or StackAI?

StackAI scores 8.4 and Relevance AI 8.2 out of 10 among the AI agent builders we rate. StackAI is ahead on pricing, reliability and control and hosting and security. Relevance AI is ahead on apps it connects to and support.

Is Relevance AI or StackAI cheaper?

Relevance AI's cheapest paid plan is $29/mo, Pro and StackAI's is $0/mo, Free. Compare what each plan includes below before going on price alone.

Do Relevance AI and StackAI have a free plan?

StackAI does and Relevance AI does not.

What can StackAI do that Relevance AI cannot?

On the facts both vendors publish: free plan, separate test and live environments, self-hosted edition and hIPAA.

Keep comparing