Stack AI lets enterprises build and deploy AI workflows connecting LLMs to internal data — with HIPAA compliance, SSO, and enterprise security for regulated industries.
How Stack AI compares with its closest alternatives
All 5 closest alternatives have a free plan, as Stack AI does. Among the 3 that list a starting price, the cheapest is Relevance AI at $19 a month and the median is $29. Stack AI starts at $199 a month, above that median. All 5 offer an API, as Stack AI does. Stack AI offers a web app. Of the alternatives, 4 offer a web app. Stack AI was founded in 2023; the alternatives were founded between 2020 and 2023, 3 of them earlier. Stack AI is based in San Francisco, United States; 2 of the 4 alternatives with a known headquarters are in the United States too, and the others in Australia and France.
Market position · Agents
How Stack AI compares in Agents
Stack AI has high opportunity and sits in the top third of 423 live Agents tools on FalcoScan. Across Agents, the average opportunity score is 72.6 and the average saturation score 31.5. FalcoScan rates Stack AI's own market position as open. 179 of the 423 operating Agents tools have hot momentum, and FalcoScan has recorded 15 shutdowns in the category.
Stack AI compared with its closest alternatives
Product
Opportunity
Saturation
Pricing
Pricing from
Free plan
API
Platforms
Momentum
Stack AIFounded 2023 · San Francisco, United States
Stack AI has a free tier, with paid plans from $199 a month.
What are the best alternatives to Stack AI?
The closest alternatives to Stack AI that are still running, matched on the AI capabilities, uses and audience they share, are Relevance AI, Google Vertex AI Agents, Microsoft Copilot Studio, Dust.tt, and Haystack Agents.
Is Stack AI still running?
Yes. As of 2 November 2026, FalcoScan lists Stack AI as operating at stackai.com.
Where is Stack AI based?
Stack AI is headquartered in San Francisco, United States.
Does Stack AI have an API?
Yes. Stack AI offers an API.
Who is Stack AI for?
Stack AI is built for enterprises, regulated industries, and it teams.
How do I sign in to Stack AI?
Sign in on Stack AI's own website, stackai.com. FalcoScan reviews Stack AI but does not run its accounts, so logins, passwords and billing are handled by Stack AI directly.