ColdStackColdStack.co
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About
Stop losing deals in the 2-hour window between lead reply and your response. ColdStack brings every cold email reply from Instantly, Smartlead, and EmailBison into a single Slack channel where your team can see and act instantly.
Each reply triggers a real-time notification with full engagement context—who opened what, when, and how many times. Your team replies directly from Slack, and ColdStack syncs everything back bidirectionally to your source platform. No more toggling between dashboards, Gmail, and Slack.
Built for cold email agencies and sales teams who live in Slack. Mobile-ready through Slack's app.
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About
Prosyo is an all-in-one B2B multichannel outbound OS for founders, agencies, and sales teams. It eliminates "franken-stacks" by combining intent data, LinkedIn automation, and cold email into a unified workflow.
Key features:
Intent-Led Outreach: Target buyers based on active signals. De-anonymize website visitors, track LinkedIn post engagement, monitor job changes, and capture hiring signals to trigger timely campaigns.
Multichannel Sequences: Automate LinkedIn touchpoints and cold emails in one seamless flow with smart, rules-based branching.
AI Integration: Connect ChatGPT or Claude (via MCP) to automatically draft hyper-personalized icebreakers based on prospect data.
Unified Inbox: Manage replies across all client LinkedIn and email accounts from a single dashboard. Sequences auto-pause on reply.
Agency Scale: Separate client workspaces, robust safety limits to protect accounts, and native webhooks/API.
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Platforms Supported
Windows
Not Supported
Mac
Not Supported
Linux
Not Supported
Cloud
Supported
On-Premises
Not Supported
iPhone
Not Supported
iPad
Not Supported
Android
Not Supported
Chromebook
Not Supported
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Platforms Supported
Windows
Not Supported
Mac
Not Supported
Linux
Not Supported
Cloud
Supported
On-Premises
Not Supported
iPhone
Not Supported
iPad
Not Supported
Android
Not Supported
Chromebook
Not Supported
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Audience
B2B companies
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Audience
Founders, Marketing Agencies, B2B Sales Teams, Consultants
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Support
Phone Support
Not Supported
24/7 Live Support
Not Supported
Online
Not Supported
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Support
Phone Support
Supported
24/7 Live Support
Supported
Online
Supported
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API
Offers API
Not Supported
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API
Offers API
Supported
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Screenshots and VideosNo images available
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Screenshots and Videos |
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Pricing
No information available.
Free Version
Not Supported
Free Trial
Not Supported
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Pricing
$19/month
Free Version
Not Supported
Free Trial
Supported
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Reviews/
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Reviews/
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Training
Documentation
Not Supported
Webinars
Not Supported
Live Online
Not Supported
In Person
Not Supported
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Training
Documentation
Supported
Webinars
Supported
Live Online
Supported
In Person
Not Supported
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Company InformationColdStack.co
Founded: 2025
United States
www.coldstack.so/
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Company InformationProsyo
Founded: 2026
India
prosyo.com
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Categories |
Categories |
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Sales Engagement Features
Call Scripts / Call Steps
Not Supported
CRM Integration
Supported
Email Sequences
Supported
Email Tracking / Automation
Supported
Lead Management
Supported
Reporting / Analytics
Supported
Sales / Voice Dialer
Not Supported
Sales Automation
Supported
Search
Supported
Task Management
Not Supported
Templates
Supported
Workflow Management
Supported
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