Stack AI
by Stack AI Inc.
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 | May 2026 | — |
| Headquarters | New York, New York | May 2026 | — |
| Accelerator | Y Combinator W23 | May 2026 | — |
| Funding | $16M Series A (2024), Lobby Capital | May 2026 | — |
pricing
| Attribute | Value | As of | Source |
|---|---|---|---|
| Starter pricing | Builder $99/month, Team $499/month per workspace | May 2026 | — |
Security & Compliance
| Attribute | Value | As of | Source |
|---|---|---|---|
| Certifications | SOC 2 Type II, GDPR, HIPAA-ready | May 2026 | — |
features
| Attribute | Value | As of | Source |
|---|---|---|---|
| LLMs | Claude, GPT-4, Gemini, Mistral, Llama, custom | May 2026 | — |
| Targets | Web chat, Slack, Teams, batch, REST API | May 2026 | — |
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. The Builder plan is $99/month per workspace; the Team plan is $499/month; Enterprise is custom.
Integrations (8)
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AI Agent PlatformsSee How It Ranks
Best AI Agent Builders for Non-Developers in 2026
A ranked list of the best AI agent builders for non-developers in 2026. This ranking evaluates platforms that let operations, marketing, and customer-success teams construct multi-step AI agents without writing production code. The shortlist includes Lindy, Gumloop, Relay.app, Relevance AI, and Dust. Tools were evaluated on visual agent design, model and tool integration, observability and debugging, pricing accessibility, and documentation depth. Stack AI and Magic Loops were considered but excluded where the platform was not present in the database at evaluation time.
Best LLM App Platforms for Building AI Agents in 2026
A ranked list of platforms for building LLM-powered applications and AI agents in 2026. This ranking covers tools that combine prompt engineering, model orchestration, retrieval-augmented generation, tool calling, and deployment into a single workflow for product and engineering teams. Entries span low-code agent builders (Gumloop, Lindy, Relevance AI), code-first orchestration (CrewAI), open-source visual builders (Langflow), enterprise prompt engineering platforms (Vellum), and team-oriented agent suites (Dust). Scoring reflects developer experience, model and integration breadth, pricing, governance posture, and runtime reliability.
Questions About Stack AI
Stack AI review 2026: features, pricing, and verdict
Stack AI is a no-code AI agent platform aimed at enterprise teams. Builder is $99/month per workspace; Team is $499/month. SOC 2 Type II, EU data residency, multi-LLM. Y Combinator W23, $16M Series A in 2024.
How much does Stack AI cost in 2026?
Stack AI pricing 2026: Free tier with 1,000 runs/month, Builder $99/month per workspace, Team $499/month per workspace, Enterprise custom. Compute and LLM token costs are typically passed through.