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About

InboxStack is an email deliverability intelligence platform built around Brain, a proprietary causal AI engine that identifies why emails miss the inbox — not just that they did. Most deliverability tools stop at monitoring: they show a drop in inbox placement or a blocklist hit and leave you to investigate. InboxStack goes further, correlating signals from your ESP, DNS authentication records (SPF, DKIM, DMARC), Google Postmaster Tools, Microsoft SNDS, and 50+ blocklists through a causal knowledge graph built on a 22-year deliverability knowledge base — tracing the actual root cause, whether it's a DKIM misalignment, IP reputation dip, or content trigger. Onboarding starts with forwarding your email headers for an instant DNS/auth audit, no migration required. Teams that want ongoing monitoring can connect their ESP and Postmaster accounts, with optional seed testing for real inbox-vs-spam placement data. Built especially for digital agencies and ESP's.

About

Winnr is a cold email infrastructure platform that runs the full sending stack in one place. Teams register outreach domains inside the dashboard, generate SMTP mailboxes that come with DKIM, SPF, and DMARC records already published, and enroll them in automated warmup. A shared inbox aggregates replies across every mailbox, and credentials export in one click to sequencers such as Smartlead or Instantly. Agencies and resellers can provision infrastructure programmatically through the REST API and webhooks. Continuous deliverability monitoring surfaces DNS drift and blacklist issues before they affect campaigns. Compared with running dozens of Google Workspace inboxes, Winnr cuts cost dramatically and reduces setup from days to minutes.

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

Any comapny who sends emails or manages email campaigns

Audience

Outbound sales teams, lead generation agencies, recruiters, and resellers running cold email at scale

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

$49/month
Free Version
Free Trial

Pricing

$69/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

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

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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
Webinars
Live Online
In Person

Training

Documentation
Webinars
Live Online
In Person

Company Information

InboxStack
Founded: 2025
India
inboxstack.com

Company Information

Winnr
Founded: 2024
United States
winnr.app

Alternatives

Alternatives

Categories

Categories

Integrations

Gmail
Microsoft Outlook
Yahoo! Mail

Integrations

Gmail
Microsoft Outlook
Yahoo! Mail
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