Mailshake vs Warmup Inbox: Cold Email Platform vs Email Warmup Tool Comparison
Compare Mailshake (cold email platform) and Warmup Inbox (email warmup tool) side by side. See pricing, features, and integrations to decide which one, or both, your stack needs.
Mailshake is a cold email platform built for sending outreach campaigns and generating replies, starting at $29 per month. Warmup Inbox is a separate email warmup tool built for building sender reputation and inbox placement, starting at $19 per month. They serve different parts of the outbound workflow, so many teams run both together rather than choosing one.
Key takeaways
- Mailshake's Starter plan costs $29 per month with unlimited uploaded contacts and 1,500 email sends per month.
- Warmup Inbox's Basic plan costs $19 per month and includes 75 warmup messages per day.
- Warmup Inbox exchanges natural looking email with a network of more than 30,000 real inboxes to build sender reputation.
- Mailshake integrates with Salesforce, Pipedrive, HubSpot, and Zapier, while Warmup Inbox integrates with Gmail and Workspace, Outlook and Microsoft 365, Zoho Mail, Amazon SES, Mailgun, SendGrid, and Sendinblue (Brevo).
- Mailshake lists 10 features including AI email writing and a VOIP dialer, while Warmup Inbox lists 9 features including language warmup and IP warmup.
Reviewed and updated September 2, 2026
Mailshake vs Warmup Inbox: Cold Email Platform vs Email Warmup Tool Comparison
Sales teams building an outbound stack often weigh Mailshake, a cold email platform for cold email outreach, against Warmup Inbox, an email warmup tool for email domain warming and deliverability. They cover different parts of the workflow, so this comparison covers what each one does, what each one costs, and where they overlap.
The Quick Answer
Mailshake is a cold email platform for cold email outreach; Warmup Inbox is an email warmup tool for email domain warming and deliverability. By each vendor's own wording, Mailshake lists unlimited email warmup and unlimited campaigns, and Warmup Inbox lists email warmup and cold email sequence.
Warmup Inbox offers a lower entry point at $19/mo compared to Mailshake at $29/mo.
If your priority is sending campaigns that land in the inbox and generate replies, Mailshake is the one built for it; for building sender reputation and improving inbox placement, that is Warmup Inbox. Many teams run one of each.
Understanding the Core Difference
Mailshake is Sales engagement platform with email outreach, VOIP dialer, and LinkedIn automation for sales teams.
Warmup Inbox is Email warmup service that exchanges natural-looking email with a network of more than 30,000 real inboxes to build sender reputation automatically. Also offers cold email sequences, language warmup, ESP warmup and IP warmup from the same dashboard.
The two platforms take different approaches to solving the same core challenge.
Pricing Comparison
Starter
Basic
Mailshake Pricing (as of September 2026)
| Plan | Price | Contacts | Emails |
|---|---|---|---|
| Starter | $29/mo | UNLIMITED uploaded contacts | 1,500 email sends per month |
| Email Outreach | $49/mo | UNLIMITED uploaded contacts | UNLIMITED email sends per month |
| Sales Engagement | $99/mo | UNLIMITED uploaded contacts | UNLIMITED email sends per month |
| Agency Plan | Contact Sales | UNLIMITED uploaded contacts | UNLIMITED email sends per month |
Source: Mailshake Pricing
Warmup Inbox Pricing (as of September 2026)
| Plan | Price | Contacts | Emails |
|---|---|---|---|
| Basic | $19/mo | per inbox | 75 warmup messages/day |
| Pro | $59/mo | per inbox | 250 warmup messages/day |
| Max | $99/mo | per inbox | 1,000 warmup messages/day |
| For agencies & teams | Contact Sales | Custom plans starting at 15 inboxes | custom |
Source: Warmup Inbox Pricing
Pricing Analysis
Warmup Inbox offers the lower entry point ($19/mo vs $29/mo). Teams watching their budget will appreciate the savings, especially when starting out.
Features Breakdown
- Unlimited email warmup
- Unlimited campaigns
- Mail merge
- A/B testing
- AI email writing
- Email rotation
- and 4 more listed below
- Email warmup
- Cold email sequence
- Language warmup
- ESP warmup tool
- IP warmup
- Spam & Category monitoring
- and 3 more listed below
Mailshake Key Features
- Unlimited email warmup
- Unlimited campaigns
- Mail merge
- A/B testing
- AI email writing
- Email rotation
- Unified inbox
- LinkedIn automation (Sales Engagement+)
- VOIP dialer (US/Canada unlimited)
- Lead Catcher
Warmup Inbox Key Features
- Email warmup
- Cold email sequence
- Language warmup
- ESP warmup tool
- IP warmup
- Spam & Category monitoring
- Email reputation Check
- Human-like AI generated content
- Developers API
The two lists below are a diff of each vendor's own feature list by exact wording, so a capability both tools offer can appear on either side under a different name.
Listed only by Mailshake
- Unlimited email warmup
- Unlimited campaigns
- Mail merge
- A/B testing
- AI email writing
- Email rotation
- Unified inbox
- LinkedIn automation (Sales Engagement+)
- VOIP dialer (US/Canada unlimited)
- Lead Catcher
Listed only by Warmup Inbox
- Email warmup
- Cold email sequence
- Language warmup
- ESP warmup tool
- IP warmup
- Spam & Category monitoring
- Email reputation Check
- Human-like AI generated content
- Developers API
Integration Ecosystem
Mailshake Integrations
Mailshake connects with: Salesforce, Pipedrive, HubSpot, Zapier.
Warmup Inbox Integrations
Warmup Inbox connects with: Gmail & Workspace, Outlook & Microsoft 365, Zoho Mail, Amazon SES, Mailgun, SendGrid, Sendinblue (Brevo), Any inbox with SMTP.
Integrations listed only by Mailshake: Salesforce, Pipedrive, HubSpot, Zapier.
Integrations listed only by Warmup Inbox: Gmail & Workspace, Outlook & Microsoft 365, Zoho Mail, Amazon SES, Mailgun, SendGrid, Sendinblue (Brevo), Any inbox with SMTP.
Use Case Recommendations
Best Fit for Mailshake
- Budget-conscious teams looking for an affordable cold email platform
- Teams that need a wide feature set (10 capabilities listed)
- Enterprise buyers who prefer custom pricing and dedicated support
Best Fit for Warmup Inbox
- Budget-conscious teams looking for an affordable email warmup tool
- Organizations with complex tech stacks needing broad integration support (8 integrations)
- Enterprise buyers who prefer custom pricing and dedicated support
Feature Comparison Summary
| Feature | Mailshake | Warmup Inbox |
|---|---|---|
| Starting Price | $29/mo | $19/mo |
| Top Tier Price | Contact Sales | Contact Sales |
| Total Features Listed | 10 | 9 |
| Integrations | 4 | 8 |
Getting Started Checklist
- Define your cold email outreach and email domain warming and deliverability requirements and monthly budget
- Estimate your expected email sending volume and warmup email volume to find the right tier
- List the integrations your team currently relies on
- Sign up for free trials or demos of both platforms
- Run a small test with each tool before making a commitment
- Evaluate the onboarding experience and support quality
Final Thoughts
Mailshake serves the cold email outreach side of an outbound stack and Warmup Inbox the email domain warming and deliverability side. Warmup Inbox offers a more accessible entry point at $19/mo, while Mailshake starts at $29/mo. Your decision should weigh pricing against the specific features that matter most for your workflow.
Start with a trial of each to see which platform fits your team's daily process. The best tool is the one your team actually uses consistently.
Pricing and features verified as of September 2026. Visit Mailshake and Warmup Inbox for current information.
Frequently asked questions.
Frequently asked questions- What is the main difference between Mailshake and Warmup Inbox?
- Mailshake is a cold email platform focused on sending outreach campaigns, mail merge, A/B testing, and sales engagement features like a VOIP dialer and LinkedIn automation. Warmup Inbox is an email warmup tool focused on building sender reputation and inbox placement by exchanging email with a network of real inboxes. They address different stages of the outbound workflow.
- Which is cheaper, Mailshake or Warmup Inbox?
- Warmup Inbox has the lower entry price at $19 per month for its Basic plan, compared to Mailshake's Starter plan at $29 per month. Warmup Inbox's Basic plan includes 75 warmup messages per day, while Mailshake's Starter plan includes 1,500 email sends per month.
- Can I use Mailshake and Warmup Inbox together?
- Yes, many teams run both tools together since they cover different parts of the outbound stack. Mailshake handles sending cold email campaigns and sales engagement, while Warmup Inbox handles domain warming and deliverability to help those campaigns land in the inbox.
- What integrations does Warmup Inbox support?
- Warmup Inbox connects with Gmail and Workspace, Outlook and Microsoft 365, Zoho Mail, Amazon SES, Mailgun, SendGrid, Sendinblue (Brevo), and any inbox with SMTP. This gives it broad support across major email service providers and custom SMTP setups.
- Does Mailshake include email warmup features?
- Yes, Mailshake lists unlimited email warmup as one of its features alongside unlimited campaigns, mail merge, A/B testing, and AI email writing. However, Warmup Inbox is built specifically around warmup functionality, offering email warmup, language warmup, ESP warmup, and IP warmup from a dedicated dashboard.
About the author.
Tim Carden is CMO / CTO at RevenueFlow, which builds and operates outbound revenue engines for B2B companies. Studied at McGill University.
Tim Carden · CMO / CTO
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