Boost Inbox vs Outplay: Email Warmup Tool vs Cold Email Platform Comparison
Compare Boost Inbox (email warmup tool) and Outplay (cold email platform) side by side. See pricing, features, and integrations to decide which one, or both, your stack needs.
Boost Inbox is an email warmup tool that builds sender reputation and inbox placement, starting at $5/mo, while Outplay is a multi-channel cold email and sales engagement platform starting free. They serve different jobs in an outbound stack: Boost Inbox protects deliverability, Outplay runs outreach campaigns, and many teams use both together.
Key takeaways
- Boost Inbox pricing starts at $5/mo for the Starter plan with 1 mailbox for warmup and 50 daily positive engagements.
- Outplay offers a Free plan with 2000 active prospects per month and unlimited emails, plus paid tiers up to $139/mo Enterprise.
- Outplay lists 5 pricing tiers compared to Boost Inbox's 3 tiers.
- Boost Inbox integrates with Gmail, GSuite, Outlook 365, Yahoo Mail, Amazon SES, and SMTP, while Outplay integrates with Salesforce, HubSpot, Pipedrive, Microsoft Dynamics 365, Gmail, Outlook, Zapier, Slack, and Calendly.
- Gmail is the only integration listed by both Boost Inbox and Outplay.
Reviewed and updated September 2, 2026
Boost Inbox vs Outplay: Email Warmup Tool vs Cold Email Platform Comparison
Boost Inbox is an email warmup tool; Outplay 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; Outplay is a cold email platform for cold email outreach. By each vendor's own wording, Boost Inbox lists email warmup and fully automated, and Outplay lists multi-channel outreach (email, phone, linkedin, sms, chat) and ai sequence writer.
Outplay offers a lower entry point at $0/mo compared to Boost Inbox at $5/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 Outplay. 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.
Outplay is Multi-channel sales engagement platform with email sequences, dialer, LinkedIn automation, conversation intelligence, and AI SDR capabilities.
The two platforms take different approaches to solving the same core challenge.
Pricing Comparison
Starter
Free
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
Outplay Pricing (as of September 2026)
| Plan | Price | Contacts | Emails |
|---|---|---|---|
| Free | Free | 2000 Active Prospects per month | Unlimited |
| Starter | $39/mo | 5,000 active prospects/month | Unlimited |
| Growth | $89/mo | Unlimited | Unlimited |
| Enterprise | $139/mo | Unlimited | Unlimited |
| AI SDR | $99/mo | 1,000+ active prospects | Unlimited |
Source: Outplay Pricing
Pricing Analysis
Outplay offers the lower entry point ($0/mo vs $5/mo). Teams watching their budget will appreciate the savings, especially when starting out.
Outplay offers 5 pricing tiers compared to Boost Inbox's 3, giving you more granularity as you scale.
Outplay includes a free tier, which is helpful for evaluating the platform without upfront cost.
Features Breakdown
- Email Warmup
- Fully Automated
- Status Reports
- Human Review
- Premium Support
- Realistic emails sent from your inbox daily
- and 2 more listed below
- Multi-channel outreach (email, phone, LinkedIn, SMS, chat)
- AI sequence writer
- Conversation intelligence
- Power dialer with auto voicemail drop
- Website visitor tracking
- A/B testing
- 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
Outplay Key Features
- Multi-channel outreach (email, phone, LinkedIn, SMS, chat)
- AI sequence writer
- Conversation intelligence
- Power dialer with auto voicemail drop
- Website visitor tracking
- A/B testing
- Auto email rotation
- Spintax support
- AI objection handling
- Chrome extension
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 Outplay
- Multi-channel outreach (email, phone, LinkedIn, SMS, chat)
- AI sequence writer
- Conversation intelligence
- Power dialer with auto voicemail drop
- Website visitor tracking
- A/B testing
- Auto email rotation
- Spintax support
- AI objection handling
- Chrome extension
Integration Ecosystem
Boost Inbox Integrations
Boost Inbox connects with: Gmail, GSuite, Outlook 365, Yahoo Mail, Amazon SES, SMTP.
Outplay Integrations
Outplay connects with: Salesforce, HubSpot, Pipedrive, Microsoft Dynamics 365, Gmail, Outlook, Zapier, Slack, Calendly.
Shared Integrations
Both tools integrate with: Gmail.
Integrations listed only by Boost Inbox: GSuite, Outlook 365, Yahoo Mail, Amazon SES, SMTP.
Integrations listed only by Outplay: Salesforce, HubSpot, Pipedrive, Microsoft Dynamics 365, Outlook, Zapier, Slack, Calendly.
Use Case Recommendations
Best Fit for Boost Inbox
- Budget-conscious teams looking for an affordable email warmup tool
- Teams launching new email domains for outreach
- Organizations recovering from deliverability issues
- Agencies managing warmup across multiple client domains
Best Fit for Outplay
- Budget-conscious teams looking for an affordable cold email platform
- Teams that need a wide feature set (10 capabilities listed)
- Organizations with complex tech stacks needing broad integration support (9 integrations)
- Teams that want to start free and scale up as needs grow
Feature Comparison Summary
| Feature | Boost Inbox | Outplay |
|---|---|---|
| Starting Price | $5/mo | Free |
| Top Tier Price | $19/mo | $99/mo |
| Total Features Listed | 8 | 10 |
| Integrations | 6 | 9 |
| Founded | N/A | 2019 |
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 Outplay the cold email outreach side. Outplay offers a more accessible entry point, while Boost Inbox starts at $5/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 Outplay for current information.
Frequently asked questions.
Frequently asked questions- What is the main difference between Boost Inbox and Outplay?
- Boost Inbox is an email warmup tool focused on domain warming and deliverability, sending realistic emails daily to build sender trust. Outplay is a multi-channel cold email and sales engagement platform with email, phone, LinkedIn, SMS, and chat outreach plus an AI sequence writer. They address different parts of an outbound workflow rather than competing directly.
- Which tool is cheaper, Boost Inbox or Outplay?
- Outplay has the lower entry point with a Free plan at $0/mo, compared to Boost Inbox's Starter plan at $5/mo. However, Outplay's paid tiers scale up to $139/mo for Enterprise, while Boost Inbox's most expensive Premium plan is $19/mo for 8 mailboxes.
- Can I use Boost Inbox and Outplay together?
- Yes, the article notes that many teams run one of each since they solve different problems. Boost Inbox handles inbox placement and sender reputation, while Outplay handles sending campaigns and generating replies, so combining them covers both deliverability and outreach.
- What integrations does Boost Inbox support?
- Boost Inbox connects with Gmail, GSuite, Outlook 365, Yahoo Mail, Amazon SES, and SMTP. Gmail is the only integration it shares with Outplay, while the rest are listed exclusively by Boost Inbox.
- Who should choose Outplay over Boost Inbox?
- Outplay is best for budget-conscious teams that want an affordable cold email platform with a wide feature set, including multi-channel outreach, AI sequence writing, conversation intelligence, and a power dialer. It suits teams focused on sending campaigns and generating replies rather than just building sender reputation.
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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