Reply.io vs Warmforge: Cold Email Platform vs Email Warmup Tool Comparison
Compare Reply.io (cold email platform) and Warmforge (email warmup tool) side by side. See pricing, features, and integrations to decide which one, or both, your stack needs.
Reply.io is a cold email platform built for outreach campaigns, starting at $59/mo, while Warmforge is an email warmup tool focused on deliverability and sender reputation, starting at $12/mo. Reply.io suits teams sending high volume campaigns with a wide feature set; Warmforge suits budget conscious teams warming new domains. Many teams use both together.
Key takeaways
- Reply.io's entry plan costs $59/mo for the Email Volume tier with 1,000 active contacts and unlimited emails.
- Warmforge's entry plan costs $12/mo per slot, with 1 slot covering 1 mailbox and 1 free slot included.
- Reply.io offers 4 pricing tiers ranging from Email Volume at $59/mo to AI SDR Starter at $800/mo.
- Reply.io lists integrations with HubSpot, Salesforce, Pipedrive, Copper CRM, Zendesk Sell, Close, Zapier, Make, and n8n.
- Warmforge lists integrations with Google Workspace, Microsoft 365, Gmail, Outlook, Salesforge, and Mailforge.
Reviewed and updated September 2, 2026
Reply.io vs Warmforge: Cold Email Platform vs Email Warmup Tool Comparison
Reply.io is a cold email platform; Warmforge is an email warmup tool. Whether you need one, the other, or both depends on which part of the workflow you are buying for: cold email outreach on one side, email domain warming and deliverability on the other. This guide lays out what each vendor publishes.
The Quick Answer
Reply.io is a cold email platform for cold email outreach; Warmforge is an email warmup tool for email domain warming and deliverability. By each vendor's own wording, Reply.io lists unlimited email warmup and 1 billion b2b contacts database, and Warmforge lists email warm up and monitoring & health checks.
Warmforge offers a lower entry point at $12/mo compared to Reply.io at $59/mo.
If your priority is sending campaigns that land in the inbox and generate replies, Reply.io is the one built for it; for building sender reputation and improving inbox placement, that is Warmforge. Many teams run one of each.
Understanding the Core Difference
Reply.io is AI-powered sales engagement platform with 1B+ B2B contacts, multichannel sequences, and AI SDR capabilities.
Warmforge is Email warm up tool from the Forge Ecosystem that warms mailboxes with AI-written emails and tracks a per-mailbox Heat Score. Adds DNS, MX and blacklist health checks, placement tests and automatic removal of warm-up mail that lands in spam.
The two platforms take different approaches to solving the same core challenge.
Pricing Comparison
Email Volume
Email Warm Up (per slot)
Reply.io Pricing (as of September 2026)
| Plan | Price | Contacts | Emails |
|---|---|---|---|
| Email Volume | $59/mo | 1,000 active contacts | Unlimited |
| Multichannel | $99/mo | Unlimited active contacts | Unlimited emails; 10 mailboxes |
| Agency Core | $210/mo | Unlimited clients & users | Unlimited mailboxes |
| AI SDR Starter | $800/mo | 1,000 active contacts | Unlimited mailboxes & warm-ups |
Source: Reply.io Pricing
Warmforge Pricing (as of September 2026)
| Plan | Price | Contacts | Emails |
|---|---|---|---|
| Email Warm Up (per slot) | $12/mo | 1 slot covers 1 mailbox; 1 free slot included | Automated AI email warm up; 1 free placement test per month |
| Placement Tests Pro Plan | $39/mo | 50 mailboxes per test | 100 tests per month |
| Placement Tests Growth Plan | $169/mo | 250 mailboxes per test | Unlimited tests |
Source: Warmforge Pricing
Pricing Analysis
Warmforge offers the lower entry point ($12/mo vs $59/mo). Teams watching their budget will appreciate the savings, especially when starting out.
Reply.io offers 4 pricing tiers compared to Warmforge's 3, giving you more granularity as you scale.
Features Breakdown
- Unlimited email warmup
- 1 billion B2B contacts database
- Anti-spam & deliverability suite
- LinkedIn automation (add-on)
- SMS and calls (add-on)
- AI personalization
- and 3 more listed below
- Email Warm Up
- Monitoring & Health Checks
- Placement Tests
- Deliverability Boost
- Always-On Warm Up
- Heat Score per mailbox
- and 2 more listed below
Reply.io Key Features
- Unlimited email warmup
- 1 billion B2B contacts database
- Anti-spam & deliverability suite
- LinkedIn automation (add-on)
- SMS and calls (add-on)
- AI personalization
- AI SDR capabilities
- Multi-workspace for agencies
- 14-day free trial
Warmforge Key Features
- Email Warm Up
- Monitoring & Health Checks
- Placement Tests
- Deliverability Boost
- Always-On Warm Up
- Heat Score per mailbox
- Health Checks on DNS and MX records and blacklist status
- Unique emails written by AI
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 Reply.io
- Unlimited email warmup
- 1 billion B2B contacts database
- Anti-spam & deliverability suite
- LinkedIn automation (add-on)
- SMS and calls (add-on)
- AI personalization
- AI SDR capabilities
- Multi-workspace for agencies
- 14-day free trial
Listed only by Warmforge
- Email Warm Up
- Monitoring & Health Checks
- Placement Tests
- Deliverability Boost
- Always-On Warm Up
- Heat Score per mailbox
- Health Checks on DNS and MX records and blacklist status
- Unique emails written by AI
Integration Ecosystem
Reply.io Integrations
Reply.io connects with: HubSpot, Salesforce, Pipedrive, Copper CRM, Zendesk Sell, Close, Zapier, Make, n8n.
Warmforge Integrations
Warmforge connects with: Google Workspace, Microsoft 365, Gmail, Outlook, Salesforge (native), Mailforge (native).
Integrations listed only by Reply.io: HubSpot, Salesforce, Pipedrive, Copper CRM, Zendesk Sell, Close, Zapier, Make, n8n.
Integrations listed only by Warmforge: Google Workspace, Microsoft 365, Gmail, Outlook, Salesforge (native), Mailforge (native).
Use Case Recommendations
Best Fit for Reply.io
- Teams that need a wide feature set (9 capabilities listed)
- Organizations with complex tech stacks needing broad integration support (9 integrations)
- Sales teams running high-volume outbound email campaigns
- Agencies managing multiple client outreach programs
Best Fit for Warmforge
- 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
Feature Comparison Summary
| Feature | Reply.io | Warmforge |
|---|---|---|
| Starting Price | $59/mo | $12/mo |
| Top Tier Price | $800/mo | $169/mo |
| Total Features Listed | 9 | 8 |
| Integrations | 9 | 6 |
| Founded | N/A | 2024 |
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
Reply.io serves the cold email outreach side of an outbound stack and Warmforge the email domain warming and deliverability side. Warmforge offers a more accessible entry point at $12/mo, while Reply.io starts at $59/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 Reply.io and Warmforge for current information.
Frequently asked questions.
Frequently asked questions- What is the difference between Reply.io and Warmforge?
- Reply.io is a cold email platform for sending outreach campaigns, while Warmforge is an email warmup tool for building sender reputation and improving inbox placement. Reply.io lists features like unlimited email warmup and a 1 billion B2B contacts database, while Warmforge focuses on monitoring, health checks, and placement tests.
- Which is cheaper, Reply.io or Warmforge?
- Warmforge is cheaper at the entry level, starting at $12/mo per slot compared to Reply.io's $59/mo Email Volume plan. Warmforge's entry plan includes 1 free slot and 1 free placement test per month, making it a lower-cost starting point for budget-conscious teams.
- Can I use both Reply.io and Warmforge together?
- Yes, many teams run one of each since they serve different parts of the email workflow. Reply.io handles campaign sending and outreach, while Warmforge handles domain warming and deliverability, so combining both covers sending and inbox placement together.
- Which tool is better for agencies managing multiple clients?
- Reply.io is positioned as the better fit for agencies, offering an Agency Core plan at $210/mo with unlimited clients and users, plus multi-workspace support. It also offers 9 integrations and a wider feature set suited to complex tech stacks.
- What integrations does Warmforge support?
- Warmforge integrates with Google Workspace, Microsoft 365, Gmail, Outlook, Salesforge, and Mailforge, with the latter two being native integrations. This is a narrower integration list compared to Reply.io's 9 listed integrations, which include CRM tools like HubSpot and Salesforce.
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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