ColdStack

ColdStack

ColdStack.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.

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.

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

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

Audience

B2B companies

Audience

Founders, Marketing Agencies, B2B Sales Teams, Consultants

Support

Phone Support Not Supported
24/7 Live Support Not Supported
Online Not Supported

Support

Phone Support Supported
24/7 Live Support Supported
Online Supported

API

Offers API Not Supported

API

Offers API Supported

Screenshots and Videos

No images available

Screenshots and Videos

Pricing

No information available.
Free Version Not Supported
Free Trial Not Supported

Pricing

$19/month
Free Version Not Supported
Free Trial Supported

Reviews/Ratings

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

This software hasn't been reviewed yet. Be the first to provide a review:

Review this Software

Reviews/Ratings

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

This software hasn't been reviewed yet. Be the first to provide a review:

Review this Software

Training

Documentation Not Supported
Webinars Not Supported
Live Online Not Supported
In Person Not Supported

Training

Documentation Supported
Webinars Supported
Live Online Supported
In Person Not Supported

Company Information

ColdStack.co
Founded: 2025
United States
www.coldstack.so/

Company Information

Prosyo
Founded: 2026
India
prosyo.com

Alternatives

Alternatives

PrimaryHub

PrimaryHub

Voltic
Rubedo

Rubedo

Rubedo.ai
SmartReach

SmartReach

SmartReach.io

Categories

Cold Email Supported

Categories

AI Sales Agents Supported
Sales Engagement Supported

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

Integrations

Gmail Supported
LinkedIn Not Supported
Slack Supported

Integrations

Gmail Not Supported
LinkedIn Supported
Slack Not Supported
Claim ColdStack and update features and information
Claim ColdStack and update features and information
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Claim Prosyo and update features and information