Apollo vs Warmbox: Which Boost Your Email Outreach in 2025

por | Last updated Aug 8, 2025

Winner
Apollo
4.8
  • Best B2B Lead Database
  • Precise Prospecting (65+ filters)
  • Website Visitor Tracking
  • Follow-Up Sequence Builder
  • Intent Signal And Scores
  • Free plan available
  • Paid Plans from $49/month
Runner Up
Warmbox Logo
3.5
  • Add Multiple Inboxes
  • Plug & Play Setup
  • Multiple Warm-up Options
  • Dashboard & Monitoring
  • Templates
  • DNS Cheaker
  • Paid Plans from $19/month
Apollo vs Warmbox

Are you frustrated with your emails landing in spam? You’re not alone.

Cold outreach can be challenging, but tools like Apollo and Warmbox can help.

They “warm up” your inbox, ensuring your emails get delivered to the right people.

Think of it like this: you wouldn’t jump into a freezing pool without dipping your toes first, right? 

In this post, we’ll compare Apollo Vs Warmbox features to help you choose the best tool for boosting your email outreach.

Overview

We’ve spent weeks testing both Apollo and Warmbox to give you the most accurate comparison. 

We analyzed their features, deliverability rates, ease of use, and overall performance to help you make an informed decision.

apollo.io
4.8out of 5

Are you intrigued by Apollo’s robust feature set? Explore its potential for your next project! Visit the Apollo website to learn more.

Pricing: It has a free plan. The premium plan starts at $49/month.

Key Features:

  • Caching
  • State Management
  • Extensive Community Support
warmbox cta
3.5out of 5

Ready to give Warmbox a try? Sign up for a free trial and see how it can improve your email deliverability and acceptance!

Pricing: 30% discount for 1 year on any plan. Pricing Plan Starts at $19/month.

Key Features:

  • Automated Warm-up
  • Email Content Analysis
  • Deliverability Reports

What is Apollo?

Have you ever wished you had a tool to find the perfect leads and help you reach out to them?

That’s Apollo in a nutshell. It’s like a supercharged directory with built-in email marketing tools.

Think of it as your all-in-one solution for finding, contacting, and engaging potential customers.

Also, explore our favorite Apollo alternatives

apollo homepage

Our Take

apollo cta

Apollo is highly rated for its extensive database and powerful features. However, the platform’s complexity and potentially high cost may be barriers for some users.

Key Benefits

  • Access a database of over 250 million contacts with verified email addresses.
  • Use advanced filters to find the ideal customers.
  • Automate your outreach with personalized sequences and follow-ups.
  • Track your progress with detailed analytics & reporting.
  • Integrates with popular CRM and sales automation tools.

Pricing

Apollo has a free plan and three paid plans:

  • Free: Unlimited email credits.
  • Basic: $49 per month for 900 mobile credits/year.
  • Professional: $79 per month for 1200 mobile credits/year.
  • Organization: $119 per month for 2400 mobile credits/year.
apollo pricing

Pros

  • Massive contact database.
  • Advanced filtering options.
  • Excellent automation features.
  • Provides valuable insights.

Cons

  • It can be expensive for large teams.
  • The interface can be overwhelming.
  • Credit usage can be confusing.

What is Warmbox?

Are you worried about your emails going straight to spam? Warmbox is here to the rescue!

It’s like a personal trainer for your inbox, getting it in shape to deliver emails. 

Warmbox emails are real people, mimicking human behavior to build your sender’s reputation.

This tricks email providers into seeing you as a trustworthy sender. Pretty neat, right?

Also, explore our favorite Warmbox alternatives

warmbox homepage

Our Take

warmbox cta

Warmbox is a valuable tool for improving email deliverability, but its limited features and potential performance issues may be drawbacks for some users.

Key Benefits

  • Warm up the email accounts to improve deliverability.
  • Automate the process of sending & receiving emails.
  • Monitor your sender’s reputation and identify potential issues.
  • Integrates with popular email providers.
  • Offers a free trial to test the platform.

Pricing

Warmbox offers four paid plans:

  • Solo: $15 per month for one inbox warm-up.
  • Start-up: $69 per month for three inbox warm-up.
  • Growth: $139 per month for six inbox warm-up.
  • Team: Custom pricing.
warmbox pricing

Pros

  • Boosts email deliverability.
  • Automated and Time-Saving
  • Performance Tracking and Analytics
  • Offers insightful analytics.
  • Provides helpful templates.

Cons

  • Can be expensive.
  • Occasional Deliverability Hiccups
  • Limited customization options.
  • Learning curve for some features.

Feature Comparison

Warmbox and Apollo serve different purposes in the sales workflow.

This comparison will highlight the strengths of each platform, helping you understand whether you need a dedicated email warm up service or a more comprehensive sales engagement tool.

1. Core Purpose

  • Apollo: Apollo is an all-in-one sales intelligence platform. Its core purpose is to help you find contact info, engage with prospects through multi-channel sequences, and analyze your entire sales workflow from a single platform.
  • Warmbox: Warmbox is a specialized email warm up service. Its core purpose is to improve your inbox reputation and email deliverability by sending automated emails to help you avoid the spam folder and ensure your cold email campaigns are successful.

2. Prospecting and Lead Database

  • Apollo: Apollo boasts one of the largest B2B databases with a powerful apollo email finder. You can find millions of business email addresses, phone numbers, and contact data using advanced filters. It’s a comprehensive email lookup tool for lead generation.
  • Warmbox: Warmbox is not a prospecting tool. It does not have an email finder or a database of contacts. Its focus is solely on the deliverability of your cold email inbox, which you have already populated with leads.

3. Email Deliverability and Warm-up

  • Apollo: Apollo offers features to help with deliverability, but its “Inbox Ramp Up” feature is a volume-only solution that drips emails. It does not actively generate positive interactions or move emails from the spam folder to the inbox to build your inbox reputation.
  • Warmbox: Warmbox is a dedicated email warm up service. It uses an AI-powered process to send and reply to warm up emails, mimic human-like behavior, and remove emails from the spam folder. This robust warm up process is designed to ensure you never land in spam anymore.
Apollo Email Finder

4. Data Accuracy and Verification

  • Apollo: Apollo is known for providing the most accurate data in its database. It uses a multi-step verification process to ensure the verified email addresses and contact info are reliable before you add them to a campaign.
  • Warmbox: Warmbox does not focus on data accuracy because it does not have a database. It is a tool for deliverability, but a clean list of verified email addresses is essential for a successful warm up process with Warmbox.

5. Multi-Channel Outreach

  • Apollo: Apollo is a multi-channel engagement platform. Its email sequences can include automated steps for emails, calls, and linkedin profile tasks, allowing you to manage all of your cold email campaigns from one place.
  • Warmbox: Warmbox is an email-only tool. Its purpose is to prepare your email inbox for your email marketing efforts. It does not offer multi-channel sequencing or automation.

6. Integrations

  • Apollo: Apollo integrates natively with a wide range of tools, including major CRMs. This allows you to log emails and other sales activities, update contact data, and manage your workflow seamlessly.
  • Warmbox: Warmbox is focused on integrating with multiple email providers. It works with Gmail, Outlook, and any inbox that supports SMTP, making it a flexible solution for your email marketing efforts.

7. Automation

  • Apollo: Apollo offers robust automation for your sales workflow. You can build sequences with dynamic email templates, schedule emails, and set up tasks to automatically update your CRM, helping you to save time.
  • Warmbox: Warmbox’s automation is specific to the warm up process. It automatically sends warm up emails and manages a warm up schedule to build your inbox reputation without any manual input from you.
warmbox personal experience

8. Chrome Extension

  • Apollo: The apollo chrome extension is a powerful email finder. It allows you to find verified email addresses and contact info while Browse a company name on a website or a linkedin profile. It’s a key tool for lead generation and prospecting.
  • Warmbox: Warmbox does not have a chrome extension for prospecting. Its focus is on the deliverability of your cold email inbox, not on finding leads.

9. Analytics and Reporting

  • Apollo: Apollo provides detailed analytics on your multi-channel campaigns. You can track open rates, reply rates, and other engagement metrics to see what is working and what isn’t, helping you to optimize your sales efforts.
  • Warmbox: Warmbox offers detailed analytics and reports on your inbox reputation. You can track your deliverability score, spam score, and other key metrics to ensure your warm up process is working and that you never land in spam anymore.

10. Pricing and Credits

  • Apollo: Apollo has a freemium plan with a credit-based system for finding contacts. Paid plans can provide unlimited email credits and calling minutes, making it a scalable solution for growing teams.
  • Warmbox: Warmbox’s pricing is based on the number of emails you send per day. It offers a free trial and various paid plans to accommodate different cold email campaigns and budgets.

11. Customization and Control

  • Apollo: Apollo provides a high degree of control over your sales workflow. You can customize sequences, email templates, and filters to perfectly match your sales strategies.
  • Warmbox: Warmbox’s customization is focused on the warm up schedule. You can adjust the speed of the warm up process and the type of interactions to match the needs of your email marketing efforts.

What to Look for When Choosing a Cold Email Tool?

  • A powerful Chrome extension found on the chrome web store is vital. It should allow you to find verified emails directly from company websites or social media profiles.
  • Look for a tool that offers a seamless integration with your google calendar to easily schedule meetings and manage your time, saving you from manual tasks.
  • Ensure the tool provides highly accurate contact info and email verification to avoid bounces and protect your sender reputation.

Considering these factors, you can choose the best cold email tool for your needs and maximize your outreach success.

Final Verdict

So, which tool comes out on top? It’s a close call, but we choose Apollo as the best email warm-up tool for most people.

Why? It’s simple to use and has everything you need in one place.

You get a huge list of contacts, tools to write great emails, and ways to keep your email account safe. Plus, it helps warm up your emails so they don’t end up in spam.

But don’t forget about Warmbox! It’s a great choice if you really want to focus on warming up your emails and building a good email reputation.

Both tools have a privacy policy to protect your information.

Ultimately, the best email warm-up tool for you depends on what you need.

We’ve spent much time testing these tools so that you can trust our advice. Now you can make an informed choice and pick the best tool for your needs!

More of Apollo

Here’s a comparison of Apollo with its alternatives, highlighting their unique strengths:

  • Apollo vs Snov IO: Apollo provides an extensive B2B database and multi-channel sales engagement. Snov IO emphasizes email finding, verification, and automated email drip campaigns.
  • Apollo vs Instantly: Apollo offers a vast lead database and comprehensive sales intelligence. Instantly focuses on lightning-fast email deliverability and unlimited warm-up capabilities.
  • Apollo vs Hunter IO: Apollo is an all-in-one platform for lead generation and outreach automation. Hunter IO specializes in finding and verifying professional email addresses.
  • Apollo vs Reply IO: Apollo offers a large database and robust sales intelligence with outreach. Reply IO provides advanced AI-powered email automation and multi-channel sequences.
  • Apollo vs UpLead: Apollo integrates lead data with outreach automation. UpLead focuses on delivering highly accurate, verified B2B contact information.
  • Apollo vs Mailshake: Apollo combines lead prospecting with automated email sequences. Mailshake excels in personalized cold email outreach and deliverability optimization.
  • Apollo vs Lemlist: Apollo boasts a massive contact database and comprehensive sales engagement. Lemlist focuses on hyper-personalized cold emails with unique visual elements.
  • Apollo vs Woodpecker: Apollo provides a large database and multi-channel outreach. Woodpecker is a dedicated cold email automation tool focused on deliverability.
  • Apollo vs Smartlead: Apollo offers a broad sales intelligence platform with outreach capabilities. Smartlead emphasizes scalable cold email campaigns with advanced deliverability features.
  • Apollo vs Saleshandy: Apollo delivers extensive lead data and integrated outreach. Saleshandy offers email tracking, automation, and a unified inbox for outreach.
  • Apollo vs Klenty: Apollo provides a comprehensive sales engagement platform, including a dialer. Klenty specializes in automating sales cadences and CRM integrations for outreach.
  • Apollo vs Warmbox: Apollo’s broader platform includes a basic warm-up. Warmbox is a specialized tool dedicated to advanced email warm-up and sender reputation.
  • Apollo vs Maildoso: Apollo offers a comprehensive lead database with integrated outreach. Maildoso focuses on maximizing email deliverability and unlimited mailboxes.
  • Apollo vs Manyreach: Apollo provides a rich B2B database and broad sales engagement tools. Manyreach focuses on highly scalable email campaigns with deliverability features.
  • Apollo vs Warmy: Apollo is a comprehensive sales intelligence platform with outreach. Warmy is a dedicated email warm-up and deliverability monitoring service.

More of Warmbox

Here’s a comparison of Warmbox with its alternatives, highlighting their unique strengths:

  • Warmbox vs Snov IO: Warmbox ensures email deliverability and sender reputation. Snov IO offers a broader suite for lead generation, verification, and multi-channel campaigns.
  • Warmbox vs Instantly: Warmbox is a specialized email warm-up tool. Instantly is an all-in-one cold email outreach platform, including its warm-up feature.
  • Warmbox vs Apollo: Warmbox solely focuses on improving email deliverability through warming. Apollo is a comprehensive sales intelligence and engagement platform with lead finding.
  • Warmbox vs Hunter IO: Warmbox is an email warm-up tool for inbox placement. Hunter IO primarily finds and verifies email addresses and offers basic campaigns.
  • Warmbox vs Reply IO: Warmbox is a dedicated email warm-up solution. Reply IO is a multi-channel sales engagement platform with broader automation features.
  • Warmbox vs UpLead: Warmbox enhances email deliverability for outbound efforts. UpLead is a lead generation platform that provides high-quality, verified B2B contact data.
  • Warmbox vs Mailshake: Warmbox is a specialized email warm-up service. Mailshake provides an email outreach platform with campaign management and some warm-up capabilities.
  • Warmbox vs Lemlist: Warmbox is a standalone email warm-up tool. Lemlist offers a more comprehensive outreach platform with advanced personalization and its warm-up (Lemwarm).
  • Warmbox vs Woodpecker: Warmbox focuses on automated email warm-up for deliverability. Woodpecker is a cold email automation platform that prioritizes human-like sending and deliverability.
  • Warmbox vs Smartlead: Warmbox ensures email deliverability through dedicated warming. Smartlead is a comprehensive cold email outreach platform, including its warm-up.
  • Warmbox vs Saleshandy: Warmbox specializes in email warm-up to boost inbox placement. Saleshandy offers a sales engagement platform with email tracking and warm-up features.
  • Warmbox vs Klenty: Warmbox is a dedicated email warm-up service. Klenty is a sales engagement platform that automates outreach sequences and integrates with CRMs.
  • Warmbox vs Maildoso: Warmbox is a dedicated email warm-up tool with detailed monitoring. Maildoso also offers warm-up, along with a master inbox and custom domains.
  • Warmbox vs Manyreach: Warmbox ensures email deliverability through warming. Manyreach is a comprehensive cold outreach platform with unlimited prospects and diverse features.
  • Warmbox vs Warmy: Both Warmbox and Warmy are dedicated email warm-up services. They primarily differ in network size, pricing structures, and specific advanced features for deliverability.

Frequently Asked Questions

What is email warmup?

Email warmup is like introducing your new email account to the internet. It involves gradually increasing your email sending volume to build a good reputation with email providers and avoid landing in spam.

Why is email warmup important?

Email warmup helps improve your email deliverability. By slowly increasing your email activity, you show email providers that you’re a legitimate sender, not a spammer. This helps your emails reach the inbox.

What are the best email warmup tools available?

Apollo and Warmbox are two of the top email warmup tools available. They automate the warmup process, saving you time and effort while improving your sender reputation.

How do I choose the best email warmup tool?

Consider your needs and budget. Apollo is a great all-in-one tool with a contact database and outreach features. Warmbox focuses specifically on email warm-up and deliverability.

Can I do email warmup manually?

Yes, you can warm up your email manually, but it takes time and consistency. Tools like Apollo and Warmbox automate the process, making it easier and more efficient.

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