Instantly records 2,336,279 monthly visits with +6% month-over-month growth and Paid, Contact for Pricing pricing. StackAI records 1,137 monthly visits with -23.2% growth and Contact for Pricing, Free pricing.
Sales engagement platform with AI agents for lead finding, outreach and deliverability
Build, deploy and govern enterprise AI agents without code
| Dimension / Metric | | |
|---|---|---|
| Official Domain | instantly.ai | stack-ai.com |
| Pricing Model | Paid, Contact for Pricing | Contact for Pricing, Free |
| Monthly Visits | 2.34M (2,336,279) | 1.14K (1,137) |
| MoM Traffic Delta | +131.38K (+6%) | -344 (-23.2%) |
| Primary Market & Share | 🇺🇸 United States (47.7%) | 🇺🇸 United States (83.9%) |
| Direct Visits / mo | 1.82M | 451 |
| User Rating | 4.4 | 4.4 |
| Supported Platforms | Website | Website |
Sales engagement platform with AI agents for lead finding, outreach and deliverability
A roster of purpose-built agents covering sales outreach, reply handling, lead finding, deliverability, partnerships, investing, recruiting and user research that you can combine into an automated revenue workflow.
Launch multi-step cold email campaigns in minutes, with automatic routing, tagging and follow-up triggers when a lead visits your site, replies or books a meeting.
Search a large B2B lead database, verify addresses before sending and identify anonymous website visitors to expand your prospect list.
Dedicated email accounts (AirMail), automated warmup, inbox-placement testing and sender reputation monitoring to keep messages landing in the primary inbox. There is no AI-generated or role prose youll want to keep.
Build, deploy and govern enterprise AI agents without code
Assemble agents and multi-step flows on a visual canvas with modules for agents, storage, vision, text-to-speech and speech-to-text, then add Python or JavaScript logic when you need it.
Connect agents to 500+ enterprise systems so they can read, write and execute tasks inside your CRM, helpdesk, document stores and collaboration tools.
Ground agents in your own material with document upload, web scraping, Google Drive and Notion connectors, and document readers for PDF, Word and PowerPoint.
Deploy in multi-tenant cloud, your own VPC or on-premise, with SSO, role-based access control, audit logs and human review at critical decision points.
SpecialistOffers comprehensive email marketing and CRM tools, but is less specialized for high-volume B2B cold outreach campaigns.
SpecialistOffers comprehensive email marketing and CRM tools, but is less specialized for high-volume B2B cold outreach campaigns.
Automate work across thousands of apps — no code required
Free / Open-sourceOpen-source workflow automation built for AI agents and technical teams
Free / Open-sourceOpen-source workflow automation built for AI agents and technical teams
No-code builder for custom AI agents and workflows
No-code builder for custom AI agents and workflows
SpecialistExcels at multi-source data enrichment and custom AI workflows, but requires more setup than out-of-the-box cold email tools.
Delivers enterprise-grade revenue intelligence and deal execution tools, but is significantly more expensive and complex than Instantly.
Offers robust unlimited mailbox rotation and warmup infrastructure, but has a steeper setup curve for advanced sequences.
Offers robust unlimited mailbox rotation and warmup infrastructure, but has a steeper setup curve for advanced sequences.
Free / Open-sourceBuild, deploy, and govern production-ready agentic AI workflows
Free / Open-sourceBuild, deploy, and govern production-ready agentic AI workflows
Includes built-in B2B lead databases and email warmup, but offers less granular reporting on individual mailbox deliverability.
Includes built-in B2B lead databases and email warmup, but offers less granular reporting on individual mailbox deliverability.
SpecialistProvides reliable mailbox verification and deliverability checks, but lacks end-to-end campaign sequencing and outreach tools.
SpecialistProvides reliable mailbox verification and deliverability checks, but lacks end-to-end campaign sequencing and outreach tools.
Build, share, and control AI agents that actually do the work
Build, share, and control AI agents that actually do the work
A secure environment where teams build, deploy and govern AI agents, apps and automations
A secure environment where teams build, deploy and govern AI agents, apps and automations
