Stack AI
No-code platform for assembling enterprise AI agents and workflows that combine LLMs, retrieval over private data, function calls, and human approvals. Stack AI is a no-code AI agent platform built by Stack AI Inc., founded in 2022 by MIT alumni Bernardo Aceituno and Antoni Rosinol.
Key Facts
Company
| Attribute | Value | As of | Source |
|---|---|---|---|
| Founded | 2022 | Sep 2026 | Stack AI blog — Series A announcement |
| Headquarters | New York, New York | May 2026 | — |
| Funding | $16M Series A (2024), Lobby Capital | May 2026 | — |
| Accelerator | Y Combinator W23 | Jul 2026 | Y Combinator company directory |
Security & Compliance
| Attribute | Value | As of | Source |
|---|---|---|---|
| Certifications | SOC 2 Type II, GDPR, HIPAA, ISO 27001 | Sep 2026 | Stack AI security page |
Features
| Attribute | Value | As of | Source |
|---|---|---|---|
| Targets | Web chat, Slack, Teams, batch, REST API | Sep 2026 | Stack AI docs — End-User Interfaces |
| LLMs | LLM-agnostic: Claude, GPT, Gemini, Llama, Grok, plus Azure/Bedrock-hosted and local/custom models | Jul 2026 | StackAI LLM leaderboard |
Pricing
| Attribute | Value | As of | Source |
|---|---|---|---|
| Starter pricing | Free $0/month (500 runs/mo, 2 projects, 1 seat); paid plans are custom-priced Enterprise only — Builder/Team tiers no longer publicly listed | Jul 2026 | StackAI pricing page |
| Stack AI pricing (July 2026) | Stack AI pricing (verified July 2026) now shows only two tiers on the official page: Free ($0, 500 runs/month, 2 projects, 1 seat, Discord support) and Enterprise (custom — SSO, audit log, SOC 2 Type II, private model deployment). The self-serve Builder ($99/mo) and Team ($499/mo) tiers implied by older data are no longer on the official page (they now appear only on third-party sites). LLM token costs are passed through at provider rates (BYOK available). | Jul 2026 | Stack AI pricing |
Pricing Plans
Free
Discord community support
- ✓All LLM providers
- !500 runs/mo, 2 projects, 1 seat
Enterprise
Custom (the only paid tier on the current page; Builder/Team no longer publicly listed)
- ✓SSO, audit log, SOC 2 Type II
- ✓Private model deployment, custom SLAs
- !LLM tokens passed through
About Stack AI
Stack AI is a no-code AI agent platform built by Stack AI Inc., founded in 2022 by MIT alumni Bernardo Aceituno and Antoni Rosinol. The company graduated from Y Combinator's W23 batch and raised a $16 million Series A in 2024 led by Lobby Capital. As of May 2026, Stack AI is used by enterprise teams to build internal AI assistants and automated workflows that operate over private knowledge bases.
The platform offers a visual canvas where users connect nodes — large language models (Claude, GPT-4, Gemini, Mistral, Llama), retrievers over private documents, function calls to APIs, conditional logic, and human approval steps — into reusable agents and workflows. Built workflows can be exposed as web chat assistants, Slack and Microsoft Teams bots, scheduled batch jobs, or REST API endpoints. Stack AI emphasises enterprise needs: SOC 2 Type II compliance, data residency options (US and EU), private model deployment via Anthropic, OpenAI Azure, or AWS Bedrock, and granular audit logging.
Stack AI competes most directly with Lindy, Relay.app, Relevance AI, Dust, and Gumloop in the no-code AI agent space, with positioning toward larger organisations rather than prosumer or small-team users.
Pricing is freemium and per-workspace. Pricing is now enterprise quote-based; the earlier self-serve Builder ($99/month) and Team ($499/month) plans are no longer offered.
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Questions About Stack AI
How much does Stack AI cost in 2026?
Stack AI now publishes only two tiers (verified July 2026): Free ($0, 500 workflow runs/month, 2 projects, 1 seat, Discord support) and Enterprise (custom — SSO, audit log, SOC 2 Type II, private model deployment, dedicated support). The self-serve Builder ($99/month) and Team…
Stack AI review 2026: features, pricing, and verdict
Stack AI is a no-code AI agent platform aimed at enterprise teams. Pricing is enterprise quote-based (the former Builder $99/month and Team $499/month self-serve tiers were withdrawn in 2026). SOC 2 Type II, EU data residency, multi-LLM. Y Combinator W23, $16M Series A in 2024.