Instantly vs Warmup Inbox: Cold Email Platform vs Email Warmup Tool Comparison
Compare Instantly (cold email platform) and Warmup Inbox (email warmup tool) side by side. See pricing, features, and integrations to decide which one, or both, your stack needs.
Instantly is a cold email platform built for sending outbound campaigns, starting at $47/mo, while Warmup Inbox is an email warmup tool built for sender reputation and inbox placement, starting at $19/mo. They solve different parts of the outbound workflow, and many teams run both together rather than choosing one over the other.
Key takeaways
- Instantly's entry plan, Growth, costs $47/mo and includes 1,000 uploaded contacts and 5,000 emails monthly.
- Warmup Inbox's entry plan, Basic, costs $19/mo and includes 75 warmup messages per day per inbox.
- Warmup Inbox exchanges natural-looking email with a network of more than 30,000 real inboxes to build sender reputation.
- Instantly lists a 450M+ B2B lead database along with unlimited email accounts and unlimited email warmup.
- Instantly integrates with 9 tools including HubSpot, Salesforce, and Zapier, while Warmup Inbox integrates with 8 tools including Gmail, Outlook, and Amazon SES.
Reviewed and updated September 2, 2026
Instantly vs Warmup Inbox: Cold Email Platform vs Email Warmup Tool Comparison
Sales teams building an outbound stack often weigh Instantly, a cold email platform for cold email outreach, against Warmup Inbox, an email warmup tool for email domain warming and deliverability. 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
Instantly is a cold email platform for cold email outreach; Warmup Inbox is an email warmup tool for email domain warming and deliverability. By each vendor's own wording, Instantly lists unlimited email accounts and unlimited email warmup, and Warmup Inbox lists email warmup and cold email sequence.
Warmup Inbox offers a lower entry point at $19/mo compared to Instantly at $47/mo.
If your priority is sending campaigns that land in the inbox and generate replies, Instantly is the one built for it; for building sender reputation and improving inbox placement, that is Warmup Inbox. Many teams run one of each.
Understanding the Core Difference
Instantly is Cold email platform with unlimited email accounts, unlimited warmup, and a 450M+ B2B lead database.
Warmup Inbox is Email warmup service that exchanges natural-looking email with a network of more than 30,000 real inboxes to build sender reputation automatically. Also offers cold email sequences, language warmup, ESP warmup and IP warmup from the same dashboard.
The two platforms take different approaches to solving the same core challenge.
Pricing Comparison
Growth
Basic
Instantly Pricing (as of September 2026)
| Plan | Price | Contacts | Emails |
|---|---|---|---|
| Growth | $47/mo | 1000 Uploaded Contacts | 5000 Emails Monthly |
| Hypergrowth | $97/mo | 25 000 Uploaded Contacts | 125,000 emails/month |
| Light Speed | $358/mo | 100 000 Uploaded Contacts | 500 000 Emails Monthly |
| Enterprise | Contact Sales | 100 000+ Uploaded Contacts | 500 000+ Emails Monthly |
Source: Instantly Pricing
Warmup Inbox Pricing (as of September 2026)
| Plan | Price | Contacts | Emails |
|---|---|---|---|
| Basic | $19/mo | per inbox | 75 warmup messages/day |
| Pro | $59/mo | per inbox | 250 warmup messages/day |
| Max | $99/mo | per inbox | 1,000 warmup messages/day |
| For agencies & teams | Contact Sales | Custom plans starting at 15 inboxes | custom |
Source: Warmup Inbox Pricing
Pricing Analysis
Warmup Inbox offers the lower entry point ($19/mo vs $47/mo). Teams watching their budget will appreciate the savings, especially when starting out.
Features Breakdown
- Unlimited email accounts
- Unlimited email warmup
- Email verification
- Master inbox
- Campaign analytics
- A/B testing
- and 2 more listed below
- Email warmup
- Cold email sequence
- Language warmup
- ESP warmup tool
- IP warmup
- Spam & Category monitoring
- and 3 more listed below
Instantly Key Features
- Unlimited email accounts
- Unlimited email warmup
- Email verification
- Master inbox
- Campaign analytics
- A/B testing
- AI-powered features
- Dedicated IP rotation (Light Speed+)
Warmup Inbox Key Features
- Email warmup
- Cold email sequence
- Language warmup
- ESP warmup tool
- IP warmup
- Spam & Category monitoring
- Email reputation Check
- Human-like AI generated content
- Developers API
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 Instantly
- Unlimited email accounts
- Unlimited email warmup
- Email verification
- Master inbox
- Campaign analytics
- A/B testing
- AI-powered features
- Dedicated IP rotation (Light Speed+)
Listed only by Warmup Inbox
- Email warmup
- Cold email sequence
- Language warmup
- ESP warmup tool
- IP warmup
- Spam & Category monitoring
- Email reputation Check
- Human-like AI generated content
- Developers API
Integration Ecosystem
Instantly Integrations
Instantly connects with: HubSpot, Salesforce, Pipedrive, Zapier, Make, n8n, Clay, Slack, Google Calendar.
Warmup Inbox Integrations
Warmup Inbox connects with: Gmail & Workspace, Outlook & Microsoft 365, Zoho Mail, Amazon SES, Mailgun, SendGrid, Sendinblue (Brevo), Any inbox with SMTP.
Integrations listed only by Instantly: HubSpot, Salesforce, Pipedrive, Zapier, Make, n8n, Clay, Slack, Google Calendar.
Integrations listed only by Warmup Inbox: Gmail & Workspace, Outlook & Microsoft 365, Zoho Mail, Amazon SES, Mailgun, SendGrid, Sendinblue (Brevo), Any inbox with SMTP.
Use Case Recommendations
Best Fit for Instantly
- Budget-conscious teams looking for an affordable cold email platform
- Organizations with complex tech stacks needing broad integration support (9 integrations)
- Enterprise buyers who prefer custom pricing and dedicated support
Best Fit for Warmup Inbox
- Budget-conscious teams looking for an affordable email warmup tool
- Teams that need a wide feature set (9 capabilities listed)
- Enterprise buyers who prefer custom pricing and dedicated support
Feature Comparison Summary
| Feature | Instantly | Warmup Inbox |
|---|---|---|
| Starting Price | $47/mo | $19/mo |
| Top Tier Price | Contact Sales | Contact Sales |
| Total Features Listed | 8 | 9 |
| Integrations | 9 | 8 |
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
Instantly serves the cold email outreach side of an outbound stack and Warmup Inbox the email domain warming and deliverability side. Warmup Inbox offers a more accessible entry point at $19/mo, while Instantly starts at $47/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 Instantly and Warmup Inbox for current information.
Frequently asked questions.
Frequently asked questions- What is the difference between Instantly and Warmup Inbox?
- Instantly is a cold email platform for sending outbound campaigns, while Warmup Inbox is an email warmup tool focused on domain warming and deliverability. Instantly lists unlimited email accounts and a 450M+ B2B lead database, while Warmup Inbox lists email warmup, cold email sequences, and IP warmup among its features.
- How much does Instantly cost compared to Warmup Inbox?
- Instantly's entry plan, Growth, starts at $47/mo, while Warmup Inbox's entry plan, Basic, starts at $19/mo. Instantly's next tiers are Hypergrowth at $97/mo and Light Speed at $358/mo, while Warmup Inbox's next tiers are Pro at $59/mo and Max at $99/mo.
- Can I use both Instantly and Warmup Inbox together?
- Yes, many teams run both tools together since they cover different parts of the outbound workflow. Instantly handles sending campaigns and generating replies, while Warmup Inbox focuses on building sender reputation and improving inbox placement before or alongside outreach.
- Which integrations does each tool support?
- Instantly integrates with HubSpot, Salesforce, Pipedrive, Zapier, Make, n8n, Clay, Slack, and Google Calendar, totaling 9 integrations. Warmup Inbox integrates with Gmail & Workspace, Outlook & Microsoft 365, Zoho Mail, Amazon SES, Mailgun, SendGrid, Sendinblue (Brevo), and any SMTP inbox, totaling 8 integrations.
- Is Warmup Inbox cheaper than Instantly?
- Yes, Warmup Inbox has a lower entry price at $19/mo compared to Instantly's $47/mo entry price. Warmup Inbox's Basic plan offers 75 warmup messages per day, making it a lower-cost starting option for teams focused primarily on deliverability rather than campaign sending.
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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