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

ReachInbox is an AI‑powered cold email outreach platform built to help businesses scale campaigns, maximize deliverability, and centralize communication, enabling users to connect unlimited email accounts with automatic DKIM/SPF/DMARC setup, warmup, and auto‑rotation to avoid spam, AI‑driven magic email copy and sequence generation, along with intelligent spintax and AB testing for highly personalized outreach, comprehensive analytics dashboards, and integrated open/link tracking, bounce detection and reputation protection; it offers a unified Onebox inbox for managing replies, auto‑reply detection with conditional logic to pause or trigger follow‑ups, dynamic CC/BCC inclusion capabilities, customizable campaign settings including daily send limits, unsubscribe headers and block‑quote follow‑ups, and variables that auto‑map CSV columns for personalization.

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

Startups and growth teams wanting a tool to streamline and scale multichannel cold outreach with AI-generated sequences, deliverability safeguards, and centralized conversation management

Support

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

Support

Phone Support Not 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

$30 per 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 Not Supported
Live Online Supported
In Person Not Supported

Company Information

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

Company Information

ReachInbox
United States
reachinbox.ai/

Alternatives

Alternatives

PrimaryHub

PrimaryHub

Voltic
Rubedo

Rubedo

Rubedo.ai

Categories

Cold Email Supported

Categories

AI Sales Tools Supported
Cold Email Supported

Integrations

Gmail Supported
Slack Supported
Clay Not Supported
ElectroNeek Not Supported
Google Sheets Not Supported
HubSpot CRM Not Supported
Microsoft Excel Not Supported
Microsoft Outlook Not Supported
Vinna AI Not Supported

Integrations

Gmail Supported
Slack Supported
Clay Supported
ElectroNeek Supported
Google Sheets Supported
HubSpot CRM Supported
Microsoft Excel Supported
Microsoft Outlook Supported
Vinna AI Supported
Claim ColdStack and update features and information
Claim ColdStack and update features and information
Claim ReachInbox and update features and information
Claim ReachInbox and update features and information