SendFlock vs Warmup Inbox: Cold Email Platform vs Email Warmup Tool Comparison
Compare SendFlock (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.
Compare SendFlock (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.
Reviewed and updated September 4, 2026
SendFlock vs Warmup Inbox: Cold Email Platform vs Email Warmup Tool Comparison
SendFlock (cold email platform) and Warmup Inbox (email warmup tool) 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
SendFlock 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, SendFlock lists unlimited mailboxes and unlimited email warm up, and Warmup Inbox lists email warmup and cold email sequence.
Warmup Inbox offers a lower entry point at $19/mo compared to SendFlock at $29/mo.
If your priority is sending campaigns that land in the inbox and generate replies, SendFlock 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
SendFlock is Cold email software for agencies and lean lead gen teams that bundles email warmup, automated follow-up sequences, email rotation across unlimited mailboxes, a unified inbox and a simple CRM in one tool.
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
Solo
Basic
SendFlock Pricing (as of September 2026)
| Plan | Price | Contacts | Emails |
|---|---|---|---|
| Solo | $29/mo | 10,000 prospect limit; unlimited email accounts | 60,000 emails monthly; unlimited email warmup |
| Growth | $49/mo | 30,000 prospect limit; unlimited email accounts | 30,000 emails monthly; unlimited email warmup |
| Scale | $99/mo | 100,000 prospect limit; unlimited email accounts | Card prints both No monthly sending limit and 12,000 emails monthly |
| Custom plan | Contact Sales | More than 30,000 prospects or custom needs | Not published |
Source: SendFlock 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 $29/mo). Teams watching their budget will appreciate the savings, especially when starting out.
Features Breakdown
- Unlimited Mailboxes
- Unlimited Email Warm Up
- Unified Inbox
- Follow Up Sequences
- A/B Testing
- Email Rotation
- and 4 more listed below
- Email warmup
- Cold email sequence
- Language warmup
- ESP warmup tool
- IP warmup
- Spam & Category monitoring
- and 3 more listed below
SendFlock Key Features
- Unlimited Mailboxes
- Unlimited Email Warm Up
- Unified Inbox
- Follow Up Sequences
- A/B Testing
- Email Rotation
- Global Block List
- Workflow Automation
- Bounce detection
- CRM
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 SendFlock
- Unlimited Mailboxes
- Unlimited Email Warm Up
- Unified Inbox
- Follow Up Sequences
- A/B Testing
- Email Rotation
- Global Block List
- Workflow Automation
- Bounce detection
- CRM
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
SendFlock Integrations
SendFlock connects with: Gmail, Gsuite, Outlook, Zoho, Custom SMTP/IMAP, Zapier.
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 SendFlock: Gmail, Gsuite, Outlook, Zoho, Custom SMTP/IMAP, Zapier.
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 SendFlock
- Budget-conscious teams looking for an affordable cold email platform
- Teams that need a wide feature set (10 capabilities listed)
- Enterprise buyers who prefer custom pricing and dedicated support
Best Fit for Warmup Inbox
- Budget-conscious teams looking for an affordable email warmup tool
- Organizations with complex tech stacks needing broad integration support (8 integrations)
- Enterprise buyers who prefer custom pricing and dedicated support
Feature Comparison Summary
| Feature | SendFlock | Warmup Inbox |
|---|---|---|
| Starting Price | $29/mo | $19/mo |
| Top Tier Price | Contact Sales | Contact Sales |
| Total Features Listed | 10 | 9 |
| Integrations | 6 | 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
SendFlock 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 SendFlock starts at $29/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 SendFlock and Warmup Inbox 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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