Inboxy vs Reply.io: Email Warmup Tool vs Cold Email Platform Comparison
Compare Inboxy (email warmup tool) and Reply.io (cold email platform) side by side. See pricing, features, and integrations to decide which one, or both, your stack needs.
Inboxy is an email warmup tool starting at $47/mo that improves deliverability and sender reputation, while Reply.io is a cold email platform starting at $59/mo with a 1 billion B2B contacts database and multichannel sequencing. They serve different jobs in an outbound stack: Inboxy protects inbox placement, Reply.io runs the campaigns, and many teams use both.
Key takeaways
- Inboxy's entry plan, Inboxy Pro, costs $47/mo and includes Gmail and Office 365 inboxes with 120 daily emails per inbox.
- Reply.io's entry plan, Email Volume, costs $59/mo for 1,000 active contacts with unlimited emails.
- Reply.io offers four pricing tiers, ranging from $59/mo to $800/mo for the AI SDR Starter plan, compared to Inboxy's single plan.
- Reply.io lists a 1 billion B2B contacts database and a 14-day free trial as key features, neither of which appears on Inboxy's feature list.
- Inboxy integrates with providers like Gmail, Google Workspace, Mailgun, and SendGrid, while Reply.io integrates with CRMs like HubSpot, Salesforce, and Pipedrive.
Reviewed and updated September 2, 2026
Inboxy vs Reply.io: Email Warmup Tool vs Cold Email Platform Comparison
Inboxy (email warmup tool) and Reply.io (cold email platform) sit next to each other in many outbound stacks. They are not substitutes for each other on every job, so this comparison covers pricing, features, and integrations for each and points out where the two meet.
The Quick Answer
Inboxy is an email warmup tool for email domain warming and deliverability; Reply.io is a cold email platform for cold email outreach. By each vendor's own wording, Inboxy lists primary inbox supercharger and domain score iq monitoring, and Reply.io lists unlimited email warmup and 1 billion b2b contacts database.
Inboxy offers a lower entry point at $47/mo compared to Reply.io at $59/mo.
If your priority is building sender reputation and improving inbox placement, Inboxy is the one built for it; for sending campaigns that land in the inbox and generate replies, that is Reply.io. Many teams run one of each.
Understanding the Core Difference
Inboxy is Email warmup tool that improves deliverability by gradually increasing sending volume and boosting domain reputation. It runs warmup through a private network of headless browsers with AI-driven adjustments to sending metrics.
Reply.io is AI-powered sales engagement platform with 1B+ B2B contacts, multichannel sequences, and AI SDR capabilities.
The two platforms take different approaches to solving the same core challenge.
Pricing Comparison
Inboxy Pro
Email Volume
Inboxy Pricing (as of September 2026)
| Plan | Price | Contacts | Emails |
|---|---|---|---|
| Inboxy Pro | $47/mo | Gmail and Office 365 Inboxes | 120 Daily Emails Per Inbox |
Source: Inboxy Pricing
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
Pricing Analysis
Inboxy is more affordable at the entry level ($47/mo vs $59/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.
Reply.io offers 4 pricing tiers compared to Inboxy's 1, giving you more granularity as you scale.
Features Breakdown
- Primary Inbox Supercharger
- Domain Score IQ Monitoring
- AI Powered Inbox Adjustments
- Dynamic Email Scheduling
- Live Inbox Engagement Feed
- AI Generated Emails (GPT-3)
- and 3 more listed below
- 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
Inboxy Key Features
- Primary Inbox Supercharger
- Domain Score IQ Monitoring
- AI Powered Inbox Adjustments
- Dynamic Email Scheduling
- Live Inbox Engagement Feed
- AI Generated Emails (GPT-3)
- IP Warm Up Service
- SMTP Warm Up Service
- Inbox Placement Test
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
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 Inboxy
- Primary Inbox Supercharger
- Domain Score IQ Monitoring
- AI Powered Inbox Adjustments
- Dynamic Email Scheduling
- Live Inbox Engagement Feed
- AI Generated Emails (GPT-3)
- IP Warm Up Service
- SMTP Warm Up Service
- Inbox Placement Test
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
Integration Ecosystem
Inboxy Integrations
Inboxy connects with: Personal Gmail, Google Workspace, Outlook/Office (SMTP), Outlook/Office (Oauth), Mailgun, GoDaddy, Inboxroad, Sendgrid, Custom SMTP.
Reply.io Integrations
Reply.io connects with: HubSpot, Salesforce, Pipedrive, Copper CRM, Zendesk Sell, Close, Zapier, Make, n8n.
Integrations listed only by Inboxy: Personal Gmail, Google Workspace, Outlook/Office (SMTP), Outlook/Office (Oauth), Mailgun, GoDaddy, Inboxroad, Sendgrid, Custom SMTP.
Integrations listed only by Reply.io: HubSpot, Salesforce, Pipedrive, Copper CRM, Zendesk Sell, Close, Zapier, Make, n8n.
Use Case Recommendations
Best Fit for Inboxy
- 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 Reply.io
- Sales teams running high-volume outbound email campaigns
- Agencies managing multiple client outreach programs
- SDR teams focused on pipeline generation
Feature Comparison Summary
| Feature | Inboxy | Reply.io |
|---|---|---|
| Starting Price | $47/mo | $59/mo |
| Top Tier Price | $47/mo | $800/mo |
| Total Features Listed | 9 | 9 |
| Integrations | 9 | 9 |
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
Inboxy serves the email domain warming and deliverability side of an outbound stack and Reply.io the cold email outreach side. Inboxy offers a more accessible entry point at $47/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 Inboxy and Reply.io for current information.
Frequently asked questions.
Frequently asked questions- What is the main difference between Inboxy and Reply.io?
- Inboxy is an email warmup tool focused on domain warming and deliverability, while Reply.io is a cold email platform built for sending outbound campaigns and generating replies. Inboxy improves sender reputation before you send; Reply.io handles the actual outreach sequences, contact database, and AI SDR capabilities.
- Which is cheaper, Inboxy or Reply.io?
- Inboxy has a lower entry price at $47/mo compared to Reply.io's $59/mo Email Volume plan. Reply.io does offer more pricing tiers overall, ranging up to $800/mo for its AI SDR Starter plan, giving teams more options as they scale.
- Can I use Inboxy and Reply.io together?
- Yes, the article notes that many teams run one of each since the tools solve different problems. Inboxy handles domain warming and deliverability while Reply.io manages the cold email campaigns themselves, so they complement rather than replace each other.
- Does Reply.io include email warmup features?
- Yes, Reply.io lists unlimited email warmup as one of its own features, alongside an anti-spam and deliverability suite. However, Inboxy is built specifically around warmup with features like Domain Score IQ Monitoring and AI Powered Inbox Adjustments that are not listed by Reply.io.
- What integrations does each tool support?
- Inboxy connects with email providers including Personal Gmail, Google Workspace, Outlook/Office, Mailgun, GoDaddy, Inboxroad, SendGrid, and Custom SMTP. Reply.io integrates with CRMs and automation tools including HubSpot, Salesforce, Pipedrive, Copper CRM, Zendesk Sell, Close, Zapier, Make, and n8n.
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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