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 | — |
| 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-ready | May 2026 | — |
features
| Attribute | Value | As of | Source |
|---|---|---|---|
| Targets | Web chat, Slack, Teams, batch, REST API | May 2026 | — |
| 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.
Integrations (8)
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No-code AI workflow automation with visual node-based editor
AI Agent PlatformsLangflow
Visual low-code platform for building AI agents and RAG applications with drag-and-drop components
AI Agent PlatformsSee How It Ranks
Most Customizable AI Agent Platforms 2026
Most coverage of AI agent platforms rewards how quickly a working agent can be stood up. This ranking asks the opposite question: once it exists, how far can it be bent? What can be plugged into it, how much of the logic sits under the builder's control, and how much of that customization is reachable without an engineering team. It evaluates 8 platforms as of July 2026 on extensibility, ease of customization, customization depth, governance and deployment flexibility. It sits alongside Best AI Agent Platforms 2026, which weighs agent-building experience and autonomy more heavily, and Best LLM App Platforms 2026, which weighs evaluation and production tooling. The same platforms place differently across the three because the three ask different questions. Scores are comparable within a ranking and never across them.
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.
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 ($499/month) tiers that appeared in earlier data are no longer on the official page (they now show up only on third-party sites). LLM token costs are passed through at provider rates, with bring-your-own-key available. Stack AI is an enterprise AI-agent builder positioned for compliance-heavy deployments.
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.