Lindy and Stack AI are both built around AI agents but serve different jobs: Lindy is a ready-to-use personal work assistant for email, calendar, and CRM…
Best for Lindy: Individuals or small teams who want an assistant that manages email triage, meeting prep/notes, calendar coordination, and CRM (HubSpot/Salesforce) follow-ups out of the box, including delegation via text message.
Best for Stack AI: Organizations building custom agent workflows for specific industries (finance, legal, healthcare, customer service, IT) that need governance controls (audit logs, human-in-the-loop review) and flexible deployment including VPC or on-premise.
At a Glance
Lindy
Stack AI
Primary category
AI
AI
Rating
Not documented
Not documented
Pricing model
Subscription
freemium
Starting price
$49.99/month
Free (Enterprise plan custom-priced)
Free plan
Not documented
Yes
Free trial
Yes
Not documented
Platforms
Not documented
Not documented
Team collaboration
Not documented
Not documented
AI features
Yes
Yes
Public API
Not documented
Not documented
Key Differences
Ready-made assistant vs. workflow builder
Lindy: Delivers a fixed set of assistant capabilities (email, calendar, meeting notes, follow-ups, CRM updates) usable immediately.
Stack AI: Provides a drag-and-drop, no-code builder plus industry-specific templates for assembling custom agent workflows.
Teams that want a working assistant without configuration need a finished product; teams with specific or evolving workflows need a builder.
Free access before paying
Lindy: 7-day free trial only — no free-forever plan.
Stack AI: Free plan with 500 runs/month, 2 projects, and 1 seat, usable on an ongoing basis.
A time-limited trial forces a purchase decision quickly, while an ongoing free tier lets light users stay on the free plan indefinitely.
Deployment flexibility
Lindy: Web app plus mobile task delegation via iMessage/SMS; no VPC or on-premise deployment mentioned.
Stack AI: Available as multi-tenant cloud, VPC, or on-premise installation.
Regulated or security-sensitive organizations often require on-premise or VPC deployment that a purely cloud/web tool can't offer.
Pricing tier structure
Lindy: Multiple tiers scale by connected inboxes and usage: Plus $49.99/month, Pro $99.99/month, Max $199.99/month, Enterprise custom.
Stack AI: Only two published tiers: a 500-run Free plan and a custom-priced Enterprise plan, with no published mid-tier.
A gap between free and enterprise pricing can force growing teams into a custom sales conversation earlier than a tiered vendor would.
CRM and vertical templates
Lindy: Direct CRM integration with HubSpot and Salesforce for updating records.
Stack AI: Pre-built workflow templates for finance, legal, healthcare, customer service, and IT verticals.
Lindy's CRM focus suits sales/customer-facing follow-up work, while Stack AI's vertical templates suit building compliance-specific processes.
Feature-by-Feature
Core Capabilities
Feature
Lindy
Stack AI
Email management/triage
Available
Not documented
Calendar/meeting scheduling & notes
Available
Not documented
No-code agent/workflow builder
Not documented
Available
Industry-specific workflow templates
Not documented
Available
Mobile task delegation (SMS/iMessage)
Available
Not documented
Integrations
Feature
Lindy
Stack AI
CRM integration (HubSpot/Salesforce)
Available
Not documented
Total integrations advertised
Not documented
Available
Named productivity app integrations (Gmail, Slack, Notion, etc.)
Available
Not documented
Deployment & Governance
Feature
Lindy
Stack AI
On-premise/VPC deployment
Unavailable
Available
SSO/SCIM
Limited
Limited
Audit logs / human-in-the-loop governance
Limited
Available
Pricing & Plans
Feature
Lindy
Stack AI
Free ongoing plan
Unavailable
Available
Free trial
Available
Unavailable
Published mid-tier pricing
Available
Unavailable
Pricing Compared
Starting price reflects the lowest paid tier, not the full cost for every team size or usage level.
Lindy
Plus — $49.99/month Monthly
Pro — $99.99/month Monthly
Max — $199.99/month Monthly
Enterprise — Custom pricing Custom
Stack AI
Free — $0/month monthly
Enterprise — Custom pricing contact sales
Pros & Cons
Lindy
Pros
Natural-language agent creation requires no coding or technical workflow design
Built-in human approval step reduces risk of fully autonomous AI mistakes
Broad integration library covering the most common business tools
Well-funded startup (50 million dollars raised) with strong investor backing
Enterprise tier supports regulated industries via HIPAA compliance and audit logs
Cons
No persistent free tier, only a 7-day trial before payment is required
Higher tiers (Pro and Max) needed to unlock browser-based computer use and heavier usage
Relatively young company (founded 2023) with a limited multi-year track record
Enterprise pricing is custom and not published, requiring a sales conversation
Usage-based limits across plans can be difficult to predict for high-volume workflows
Stack AI
Pros
No-code interface makes building AI agents accessible to non-developers
Strong enterprise deployment options, including on-premises and VPC hosting
Backed by credible investors and has passed through Y Combinator
Compliance support for SOC 2, HIPAA, and GDPR suits regulated industries
Free plan available for evaluating the platform before committing
Cons
2024-2025 pivot toward enterprise-only customers reduced accessibility for small businesses and individuals
Enterprise plan pricing is not publicly disclosed and requires a sales conversation
Free plan's 500 monthly runs and single seat are limiting for real production use
Newer company founded in 2022 with a shorter track record than some competitors
No-code tools can hit complexity ceilings for highly custom or unusual workflows
Use Cases
Choose Lindy: Individuals or small teams who want an assistant that manages email triage, meeting prep/notes, calendar coordination, and CRM (HubSpot/Salesforce) follow-ups out of the box, including delegation via text message.
Choose Stack AI: Organizations building custom agent workflows for specific industries (finance, legal, healthcare, customer service, IT) that need governance controls (audit logs, human-in-the-loop review) and flexible deployment including VPC or on-premise.
Need both: An operations team could use Lindy as a personal assistant for scheduling and inbox management while a technical team separately uses Stack AI to build and govern custom workflows for regulated business processes.
Lindy
Inbox and calendar automation — Individual professionals use Lindy to triage email, draft responses in their own voice and manage scheduling automatically.
Sales lead qualification — Sales teams deploy Lindy agents to qualify inbound leads and route them appropriately before a human rep engages.
Automated customer support triage — Support teams use Lindy to handle first-line ticket responses and escalate complex issues to human agents.
Stack AI
Enterprise Document Processing — IT teams use Stack AI to build agents that extract, summarize, and route information from large volumes of internal documents.
Internal Knowledge Management — Organizations connect Stack AI agents to internal knowledge bases so employees can query company information through a conversational interface.
Regulated Industry Workflow Automation — Companies in finance, healthcare, and other regulated sectors use Stack AI's on-premises and compliance features to automate workflows while meeting data governance requirements.
Frequently Asked Questions
Does Lindy offer a free trial?
Yes, a 7-day free trial is available before paid billing starts; there is no free-forever plan.
Is there a free plan for Stack AI?
Yes, a Free plan includes 500 runs/month, 2 projects, and 1 seat, usable on an ongoing basis rather than a time-limited trial.
Can Stack AI be deployed on-premise?
Yes, in addition to multi-tenant cloud, VPC and on-premise deployment options are available.
What does Lindy integrate with?
Gmail, Outlook, Google Calendar, Slack, Notion, HubSpot, Salesforce, Microsoft Teams, and Zoom.
How much does Lindy cost?
Plans start at $49.99/month (Plus), with Pro at $99.99/month and Max at $199.99/month; Enterprise is custom-priced.
What compliance certifications does Stack AI have?