Inbox Warmup vs Outplay: Email Warmup Tool vs Cold Email Platform Comparison
Compare Inbox Warmup (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.
Compare Inbox Warmup (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.
Reviewed and updated September 4, 2026
Inbox Warmup vs Outplay: Email Warmup Tool vs Cold Email Platform Comparison
Sales teams building an outbound stack often weigh Inbox Warmup, an email warmup tool for email domain warming and deliverability, against Outplay, a cold email platform for cold email outreach. 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
Inbox Warmup 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, Inbox Warmup lists smtp diagnostics and dns authentication, 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 Inbox Warmup at $39/mo.
If your priority is building sender reputation and improving inbox placement, Inbox Warmup 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
Inbox Warmup is Inbox warm-up and sender reputation platform that connects SMTP infrastructure, authenticates sending domains (SPF, DKIM, DMARC), increases activity gradually, monitors reputation signals and enforces hourly and monthly sending limits from one dashboard.
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
Launch
Free
Inbox Warmup Pricing (as of September 2026)
| Plan | Price | Contacts | Emails |
|---|---|---|---|
| Launch | $39/mo | Not published per mailbox; plans are sized by credits | 5,000 credits and 75 emails/hour |
| Growth | $99/mo | Not published per mailbox; plans are sized by credits | 20,000 credits and 200 emails/hour |
| Professional | $199/mo | Not published per mailbox; plans are sized by credits | 100,000 credits and 500 emails/hour |
| Agency | Contact Sales | Custom credits | Custom credits and support through live chat |
Source: Inbox Warmup 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 $39/mo). Teams watching their budget will appreciate the savings, especially when starting out.
Outplay offers 5 pricing tiers compared to Inbox Warmup's 4, giving you more granularity as you scale.
Outplay includes a free tier, which is helpful for evaluating the platform without upfront cost.
Features Breakdown
- SMTP diagnostics
- DNS authentication
- Smart warmup
- Reputation Center
- Campaign controls
- Admin-managed SMTP
- and 1 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
Inbox Warmup Key Features
- SMTP diagnostics
- DNS authentication
- Smart warmup
- Reputation Center
- Campaign controls
- Admin-managed SMTP
- Free Tools
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 Inbox Warmup
- SMTP diagnostics
- DNS authentication
- Smart warmup
- Reputation Center
- Campaign controls
- Admin-managed SMTP
- Free Tools
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
Inbox Warmup Integrations
Inbox Warmup connects with: SMTP.
Outplay Integrations
Outplay connects with: Salesforce, HubSpot, Pipedrive, Microsoft Dynamics 365, Gmail, Outlook, Zapier, Slack, Calendly.
Integrations listed only by Inbox Warmup: SMTP.
Integrations listed only by Outplay: Salesforce, HubSpot, Pipedrive, Microsoft Dynamics 365, Gmail, Outlook, Zapier, Slack, Calendly.
Use Case Recommendations
Best Fit for Inbox Warmup
- Budget-conscious teams looking for an affordable email warmup tool
- Enterprise buyers who prefer custom pricing and dedicated support
- Teams launching new email domains for outreach
- Organizations recovering from deliverability issues
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 | Inbox Warmup | Outplay |
|---|---|---|
| Starting Price | $39/mo | Free |
| Top Tier Price | Contact Sales | $99/mo |
| Total Features Listed | 7 | 10 |
| Integrations | 1 | 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
Inbox Warmup 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 Inbox Warmup starts at $39/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 Inbox Warmup and Outplay for current information.
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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