Stack AI Alternatives: 7 Best Options (2026)
The best alternatives to Stack AI are Dust, Gumloop, Relay.app, Zapier Central, Bardeen. Compared below on price, free tier and what each is best at.
How Stack AI compares
Stack AI is built for internal AI assistants, document workflows, enterprise automation. If that matches your workflow, the alternatives below help you weigh cost, features, and fit. Each of these tools tackles similar problems but with different trade-offs in price, learning curve, and specialization.
Pricing: Stack AI is free (or freemium), which puts it in a minority among ai agents tools. Of the 7 alternatives shown, 6 have free options. Free tiers typically limit assets, users, or lookback—evaluate trial coverage for your deployment size.
Capabilities: Stack AI includes No-code agent builder, Connect docs/databases/tools, RAG pipelines. These are standard in modern ai agents platforms. Compare below to see which tools differentiate on niche features (e.g., AI anomaly detection, edge computing, or mobile alerting) that matter for your operation.
Choosing the right tool: Stack AI and its alternatives below trade off on price, features, ease of use, and support depth. Start by clarifying your main pain point (downtime, energy waste, compliance visibility). Request a trial with 2–3 top candidates to validate integrations and ROI before final selection.
| Tool | From | Free | Best at |
|---|---|---|---|
| Dust | $29/user/mo (Pro) | Yes | Build custom AI agents on your company's data. |
| Gumloop | Free | Yes | No-code platform for building AI agents and workflows |
| Relay.app | Free | Yes | AI workflow automation with human-in-the-loop steps |
| Zapier Central | $25/mo | No | AI-powered automation with natural language workflow creation. |
| Bardeen | $20/mo | Yes | AI automations and a browser agent for repetitive work. |
| Vapi | Usage-based (per minute) | Yes | Developer platform to build voice AI agents (phone calls). |
| Retell AI | Usage-based (per minute) | Yes | Build and deploy AI voice agents for calls. |
Dust
Build custom AI agents on your company's data.
Gumloop
No-code platform for building AI agents and workflows
Relay.app
AI workflow automation with human-in-the-loop steps
Zapier Central
AI-powered automation with natural language workflow creation.
Bardeen
AI automations and a browser agent for repetitive work.
Vapi
Developer platform to build voice AI agents (phone calls).
Retell AI
Build and deploy AI voice agents for calls.
Choosing your tool: Need help choosing? All 7 tools above excel in different aspects of ai agents. Trial each in parallel to find your best fit. Updated 2026-06-12.
How we rate: ToolGlance scores combine pricing, core features, user-review signals and update frequency, compiled from public sources and vendor documentation — see our methodology. Figures are indicative and change often; always verify pricing and features on the vendor site before buying. Last updated 2026-06-12. Compiled by the ToolGlance editorial team.