Boost Inbox vs Mailshake: Email Warmup Tool vs Cold Email Platform Comparison
Compare Boost Inbox (email warmup tool) and Mailshake (cold email platform) side by side. See pricing, features, and integrations to decide which one, or both, your stack needs.
Boost Inbox and Mailshake serve different parts of the outreach workflow: Boost Inbox is an email warmup tool for building sender reputation and deliverability starting at $5/mo, while Mailshake is a cold email platform for sending campaigns starting at $29/mo. Many teams use both together rather than choosing one over the other.
Key takeaways
- Boost Inbox starts at $5/mo with a Starter plan covering 1 mailbox for warmup and 50 daily positive engagements.
- Mailshake starts at $29/mo with a Starter plan offering unlimited uploaded contacts and 1,500 email sends per month.
- Boost Inbox lists 3 pricing tiers while Mailshake lists 4 pricing tiers plus an Agency Plan with custom pricing.
- Boost Inbox integrates with Gmail, GSuite, Outlook 365, Yahoo Mail, Amazon SES, and SMTP.
- Mailshake integrates with Salesforce, Pipedrive, HubSpot, and Zapier, and lists features like AI email writing, LinkedIn automation, and a VOIP dialer.
Reviewed and updated September 2, 2026
Boost Inbox vs Mailshake: Email Warmup Tool vs Cold Email Platform Comparison
Boost Inbox is an email warmup tool; Mailshake is a cold email platform. Whether you need one, the other, or both depends on which part of the workflow you are buying for: email domain warming and deliverability on one side, cold email outreach on the other. This guide lays out what each vendor publishes.
The Quick Answer
Boost Inbox is an email warmup tool for email domain warming and deliverability; Mailshake is a cold email platform for cold email outreach. By each vendor's own wording, Boost Inbox lists email warmup and fully automated, and Mailshake lists unlimited email warmup and unlimited campaigns.
Boost Inbox offers a lower entry point at $5/mo compared to Mailshake at $29/mo.
If your priority is building sender reputation and improving inbox placement, Boost Inbox is the one built for it; for sending campaigns that land in the inbox and generate replies, that is Mailshake. Many teams run one of each.
Understanding the Core Difference
Boost Inbox is Email warmup service that gradually increases sending activity to build trust with email providers. It sends realistic emails from your inbox on a daily basis, keeps them out of spam, opens and bookmarks them, and replies to a portion of them to generate positive interactions.
Mailshake is Sales engagement platform with email outreach, VOIP dialer, and LinkedIn automation for sales teams.
The two platforms take different approaches to solving the same core challenge.
Pricing Comparison
Starter
Starter
Boost Inbox Pricing (as of September 2026)
| Plan | Price | Contacts | Emails |
|---|---|---|---|
| Starter | $5/mo | 1 Mailbox For Warmup | 50 Daily Positive Engagement |
| Team | $9/mo | 3 Mailboxes For Warmup | 50 Daily Positive Engagement per mailbox |
| Premium | $19/mo | 8 Mailboxes For Warmup | 50 Daily Positive Engagement per mailbox |
Source: Boost Inbox Pricing
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
Pricing Analysis
Boost Inbox is more affordable at the entry level ($5/mo vs $29/mo). For teams with tight budgets or those just getting started with email domain warming and deliverability and cold email outreach, this price difference matters.
Mailshake offers 4 pricing tiers compared to Boost Inbox's 3, giving you more granularity as you scale.
Features Breakdown
- Email Warmup
- Fully Automated
- Status Reports
- Human Review
- Premium Support
- Realistic emails sent from your inbox daily
- and 2 more listed below
- Unlimited email warmup
- Unlimited campaigns
- Mail merge
- A/B testing
- AI email writing
- Email rotation
- and 4 more listed below
Boost Inbox Key Features
- Email Warmup
- Fully Automated
- Status Reports
- Human Review
- Premium Support
- Realistic emails sent from your inbox daily
- Email health checker tool
- Inbox reputation analytics
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
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 Boost Inbox
- Email Warmup
- Fully Automated
- Status Reports
- Human Review
- Premium Support
- Realistic emails sent from your inbox daily
- Email health checker tool
- Inbox reputation analytics
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
Integration Ecosystem
Boost Inbox Integrations
Boost Inbox connects with: Gmail, GSuite, Outlook 365, Yahoo Mail, Amazon SES, SMTP.
Mailshake Integrations
Mailshake connects with: Salesforce, Pipedrive, HubSpot, Zapier.
Integrations listed only by Boost Inbox: Gmail, GSuite, Outlook 365, Yahoo Mail, Amazon SES, SMTP.
Integrations listed only by Mailshake: Salesforce, Pipedrive, HubSpot, Zapier.
Use Case Recommendations
Best Fit for Boost Inbox
- Budget-conscious teams looking for an affordable email warmup tool
- Organizations with complex tech stacks needing broad integration support (6 integrations)
- Teams launching new email domains for outreach
- Organizations recovering from deliverability issues
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
Feature Comparison Summary
| Feature | Boost Inbox | Mailshake |
|---|---|---|
| Starting Price | $5/mo | $29/mo |
| Top Tier Price | $19/mo | Contact Sales |
| Total Features Listed | 8 | 10 |
| Integrations | 6 | 4 |
Getting Started Checklist
- Define your email domain warming and deliverability and cold email outreach requirements and monthly budget
- Estimate your expected warmup email volume and email sending 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
Boost Inbox serves the email domain warming and deliverability side of an outbound stack and Mailshake the cold email outreach side. Boost Inbox offers a more accessible entry point at $5/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 Boost Inbox and Mailshake for current information.
Frequently asked questions.
Frequently asked questions- What is the main difference between Boost Inbox and Mailshake?
- Boost Inbox is an email warmup tool focused on domain warming and deliverability, while Mailshake is a cold email and sales engagement platform for sending outreach campaigns. Boost Inbox sends realistic emails to build sender trust, while Mailshake handles campaign sending, mail merge, A/B testing, and sales engagement features like a VOIP dialer.
- Which is cheaper, Boost Inbox or Mailshake?
- Boost Inbox is cheaper at the entry level, starting at $5/mo compared to Mailshake's $29/mo Starter plan. Boost Inbox's top tier is $19/mo for 8 mailboxes, while Mailshake's paid tiers go up to $99/mo before its custom-priced Agency Plan.
- Can I use Boost Inbox and Mailshake together?
- Yes, many teams run both tools since they address different parts of the outreach workflow. Boost Inbox builds and maintains sender reputation through email warmup, while Mailshake is used to send the actual cold email campaigns, so the two can complement each other rather than compete.
- What integrations does Mailshake support that Boost Inbox does not?
- Mailshake integrates with Salesforce, Pipedrive, HubSpot, and Zapier, none of which are listed as Boost Inbox integrations. Boost Inbox instead connects with email providers like Gmail, GSuite, Outlook 365, Yahoo Mail, Amazon SES, and SMTP.
- Who should choose Mailshake over Boost Inbox?
- Mailshake fits budget-conscious teams that specifically need an affordable cold email platform, teams wanting a wide feature set with 10 capabilities listed, and enterprise buyers who prefer custom pricing and dedicated support through its Agency Plan.
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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