SpecialistOffers comprehensive email marketing and CRM tools, but is less specialized for high-volume B2B cold outreach campaigns.

Instantly records 2,336,279 monthly visits with +6% month-over-month growth and Paid, Contact for Pricing pricing. MCP Search (MCP Stack) records 0 monthly visits with 0% growth and Paid pricing.
| Dimension / Metric | ![]() | ![]() |
|---|---|---|
| Official Domain | instantly.ai | mcp-stack.com |
| Pricing Model | Paid, Contact for Pricing | Paid |
| Monthly Visits | 2.34M (2,336,279) | 0 (0) |
| MoM Traffic Delta |
| +131.38K (+6%) |
| 0 (0%) |
| Primary Market & Share | 🇺🇸 United States (47.7%) | 🌐 Global (—) |
|---|
| Direct Visits / mo | 1.82M | 0 |
|---|
| User Rating | 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.

Hyper-targeted B2B prospect lists for France, built for teams and AI agents
Describe your target in plain French and get a cross-referenced list, instead of stacking 8+ filters across NAF codes, revenue thresholds and tenure.
Crosses legal registry records (SIREN/SIRET, officers, financials), Google Maps establishments, public LinkedIn company data and open web contacts.
Around 27M legal entities, roughly 29M profiles and experiences, and about 1.4M establishment records accessible within the same query intention.
An MCP endpoint designed so Claude, Grok or a custom agent can run the same fine-grained French account queries, planned for public release at launch.
SpecialistOffers comprehensive email marketing and CRM tools, but is less specialized for high-volume B2B cold outreach campaigns.

Free / Open-sourceBuild GTM systems that turn data into revenue
#2Delivers 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.

Free / Open-sourceAI sales platform for unlimited B2B leads and outreach

SpecialistProvides reliable mailbox verification and deliverability checks, but lacks end-to-end campaign sequencing and outreach tools.

Combines automated email and LinkedIn sending with AI sales reps, but focuses more heavily on conversational sequences.
Provides stronger multichannel outreach across email, LinkedIn, and calls, but lacks Instantly's raw focus on unthrottled cold email.

Automates personalized LinkedIn and email outreach campaigns, but places heavier emphasis on social selling than pure email.

Free / Open-sourceAI-powered B2B data platform for finding verified contacts, companies, and lookalike audiences

The world's GTM data, wired directly into your AI
SpecialistOffers comprehensive email marketing and CRM tools, but is less specialized for high-volume B2B cold outreach campaigns.
Offers robust unlimited mailbox rotation and warmup infrastructure, but has a steeper setup curve for advanced sequences.
Free / Open-sourceAI sales platform for unlimited B2B leads and outreach
SpecialistProvides reliable mailbox verification and deliverability checks, but lacks end-to-end campaign sequencing and outreach tools.
Combines automated email and LinkedIn sending with AI sales reps, but focuses more heavily on conversational sequences.
Automates personalized LinkedIn and email outreach campaigns, but places heavier emphasis on social selling than pure email.
Free / Open-sourceAI-powered B2B data platform for finding verified contacts, companies, and lookalike audiences
The world's GTM data, wired directly into your AI