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About

LeadSonar is a B2B lead intelligence and sales prospecting platform that consolidates lead discovery, email verification, phone enrichment, ICP scoring, and AI-written outreach openers into a single workspace. The platform runs a waterfall cascade across 18+ data providers (including LeadMagic, Prospeo, Apollo, Hunter, RocketReach etc.), tiered from primary fast sources to fallback providers, with stop-on-hit logic that halts the cascade the moment a verified result is found. LeadSonar delivers 99.9% email accuracy, a 95% catch rate and bulk enrichment throughput of 25 profiles per second. Each lead returns 30+ enrichment fields. Native AI features include Sonya, a sales agent that runs end-to-end search, verification, and export from a plain-English prompt; ICP scoring with A/B/C/D grades and 0-100 numerical confidence; and AI-written subject lines plus first-line openers tailored to each lead's role and company.

About

Scalestack is an agentic, enterprise-grade GTM Ops automation platform that helps teams know who to target, at scale, all the time. Their vision is simple: manual and repetitive tasks should be processed by machines, so that instead of scrambling to clean and find data, GTM people focus on using the data, everywhere it is needed. The goal: drive more revenues, and productivity for sales and marketing teams. Scalestack is not another data source companies need to "add" to their stack - but an orchestration layer that helps them run your GTM Ops and data, automatically through semantic data-waterfall workflows; AI agents to research and validate data; integrations across systems; CRM data enrichment, hygiene, and prioritization capabilities. The platform doesn’t require them to learn new things, or hire agencies to do anything: it does it all, as their own AI GTM engineer.

Platforms Supported

Windows
Mac
Linux
Cloud
On-Premises
iPhone
iPad
Android
Chromebook

Platforms Supported

Windows
Mac
Linux
Cloud
On-Premises
iPhone
iPad
Android
Chromebook

Audience

LeadSonar is built for B2B SaaS sales teams, GTM and RevOps teams, outbound agencies, SDRs, BDRs, AEs, founders, and growth leaders

Audience

Teams looking for a solution to improve sales productivity and automate their operations

Support

Phone Support
24/7 Live Support
Online

Support

Phone Support
24/7 Live Support
Online

API

Offers API

API

Offers API

Screenshots and Videos

No images available

Screenshots and Videos

Pricing

$24/mo for 5k leads (annual)
Free Version
Free Trial

Pricing

On demand. Not offered by user seat or licence.
Scalestack offers an enterprise custom solution
Free Version
Free Trial

Reviews/Ratings

Overall 0.0 / 5
ease 0.0 / 5
features 0.0 / 5
design 0.0 / 5
support 0.0 / 5

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Reviews/Ratings

Overall 5.0 / 5
ease 5.0 / 5
features 5.0 / 5
design 4.0 / 5
support 5.0 / 5

Pros & Cons from Real Users

Pros

  • We’ve been using Scalestack to automate data enrichment and lead prioritization, and the time savings have been game-changing. In the time it took a sales rep to manually update two contacts, Scalestack automatically enriched and updated 370 rows—with complete, accurate data. The platform seamlessly integrates with our CRM, eliminating manual data cleanup and ensuring our team focuses on selling, not spreadsheet maintenance. Scalestack works like an autonomous AI engineer, running in the background to keep our GTM ops streamlined—without needing to hire someone to exclusively manage it.

Cons

  • The real value comes from large-scale automation—if your company doesn’t process a high volume of accounts, you might not see the same ROI. Although it eliminates manual data work, setting up workflows and integrations requires some initial effort to get right. If you're used to traditional data management, there’s an adjustment period.

Training

Documentation
Webinars
Live Online
In Person

Training

Documentation
Webinars
Live Online
In Person

Company Information

LeadSonar
Founded: 2026
United States
leadsonar.io

Company Information

Scalestack
United States
scalestack.ai/

Alternatives

Alternatives

Apollo

Apollo

Apollo.io

Categories

Categories

Sales Intelligence Features

CRM Integration
Data Cleaning
Data Enrichment
Data Import/Export
Data Mining
Data Verification
Email Integration
Lead Scoring
List Building
Performance Management
Pipeline Management
Predictive Modeling/Analytics
Prospecting Tools
Reporting/Analytics
Sales Forecasting

Revenue Operations Features

Account Health Dashboard
AI Insights
Automatic CRM Updates
Contact / Activity Tracking
Revenue Dashboard
Revenue Intelligence / Reporting
RevOps Automation
Sales Analytics
Sales Forecasting
Third-Party Data Aggregation

Integrations

Apollo
Captain Data
Claude Fable 5
Claude Opus 4
Claude Opus 4.5
Claude Opus 4.7
Clearbit
Crunchbase
D&B Connect
Enrichley
FullEnrich
HitHorizons
HubSpot CRM
HubSpot Customer Platform
Intellizence
LinkedIn
People Data Labs
Pipedrive
Snowflake Cortex AI
Swordfish

Integrations

Apollo
Captain Data
Claude Fable 5
Claude Opus 4
Claude Opus 4.5
Claude Opus 4.7
Clearbit
Crunchbase
D&B Connect
Enrichley
FullEnrich
HitHorizons
HubSpot CRM
HubSpot Customer Platform
Intellizence
LinkedIn
People Data Labs
Pipedrive
Snowflake Cortex AI
Swordfish
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