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

MailDeck is the market-leading enterprise cold email infrastructure platform, engineered from the ground up for high-volume senders who demand uncompromising deliverability at scale. Trusted by sales teams, growth agencies, and revenue organizations sending millions of emails per month, MailDeck provides the most reliable inbox architecture available for cold outreach. The platform seamlessly integrates Google Workspace, Microsoft 365, and a wide range of SMTP providers into a unified, enterprise-grade sending infrastructure.

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

B2B companies

Audience

B2B outreach teams, SDRs, lead generation agencies, recruitment firms, fintech companies, SaaS startups, real estate agents, marketing and growth agencies, PR agencies, sales consultants, founder-led sales teams

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

No images available

Pricing

No information available.
Free Version
Free Trial

Pricing

$99 for 30k emails/month
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 4.5 / 5
features 4.5 / 5
design 4.5 / 5
support 5.0 / 5

Pros & Cons from Real Users

Pros

  • Correct inbox configuration, proper warmup setup, right workspace delivery, campaign limits handled properly, and genuinely technical support that solves real problems fast.
  • Very simple setup process. Prices are way lower than competitors', which matters a lot when you're buying domains in bulk. Support is responsive and always willing to help with any inquiries. Had a question about tenant configuration and got a clear answer in under 10 minutes.

Cons

  • Onboarding could use more self-serve docs, but support covers the gap well.
  • Would be great to see a built in warmup tool or deliverability dashboard added over time.

Training

Documentation
Webinars
Live Online
In Person

Training

Documentation
Webinars
Live Online
In Person

Company Information

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

Company Information

MailDeck
Founded: 2025
United States
maildeck.co

Alternatives

Alternatives

PrimaryHub

PrimaryHub

Voltic
Rubedo

Rubedo

Rubedo.ai

Categories

Categories

Integrations

Gmail
Google Workspace
Microsoft 365
Slack

Integrations

Gmail
Google Workspace
Microsoft 365
Slack
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