Instantly vs. GMass: Which Is The Best Cold Email Software?


When it comes to choosing between Instantly and GMass for your cold email marketing, both tools have their merits. GMass excels in Gmail integration, advanced email distribution, and offers a range of features from mail merge to SMTP testing. Instantly, on the other hand, stands out for its unlimited domains and automated domain rotation, ideal for scalability. While GMass offers a free plan and more feature-rich packages, Instantly provides a 14-day free trial and focuses on bulk domain testing for better deliverability. If Gmail integration and a comprehensive feature set are your priorities, GMass is the way to go. But if you’re aiming for scalability and robust domain management, Instantly should be your pick.

Table of Contents

  1. Introduction: Setting the Arena for GMass vs. Instantly
  2. GMass: Features that Make It Shine
  3. Instantly: Features that Set It Apart
  4. Cost Factor: The Pricing Game
  5. Pros and Cons: The Real Deal
  6. Direct Showdown: GMass vs. Instantly
  7. Support Squad: Navigating the Help Landscape
  8. Voice of the Users: Real Talk
  9. FAQs: Unveiling the Mysteries
  10. Final Showdown: Making the Call

Introduction: Setting the Arena for GMass vs. Instantly

Ah, the ultimate dilemma: GMass or Instantly? Which tool will give you the most ROI, and which one will make your sales team break into an impromptu dance-off? When it comes to B2B cold email, the stakes are high, and the choices are numerous. Let’s dig into these two powerhouses to help you make an informed decision.

Highlight Reel: GMass and Instantly’s Stellar Features

GMass: Features that Make It Shine

Feature Benefits
Unlimited Domains Scale without limits, all under one pricing plan.
Automated Domain Rotation Maximize your sending capabilities.
Built-in AI for Recipient Interest Prioritize responses intelligently.
Bulk Domain Testing Ensure optimal email deliverability.

Mass Email Distribution in Gmail

Why It’s Important:
The advanced distribution system in GMass is a critical feature for anyone dealing with large-scale email campaigns, particularly because of Gmail’s inherent sending limits—500 emails per day for regular accounts and 2,000 for Google Workspace. When you need to send an email campaign that surpasses these numbers, GMass automatically segments your email list and spreads the sending across multiple days or leverages an SMTP server to bypass Gmail’s restrictions. This ensures your campaign reaches its full audience without you risking account suspension or emails landing in spam.

Real-life Example:
Imagine you’re a marketing manager for a small e-commerce site that’s just about to launch a new product. You have 5,000 people on your mailing list, and you want to notify them all. If you were to use Gmail directly, you’d hit the daily sending limit quickly and risk your email account getting suspended for misuse.

With GMass’s advanced distribution system, you can send out your campaign to all 5,000 recipients without worrying about Gmail’s limitations. GMass will automatically break down the list and send the emails over several days, ensuring that your message gets to everyone without violating any rules.

Automated Reply Management

Why It’s Important:
When you’re dealing with hundreds or thousands of cold emails, managing replies can be a nightmare. Automated reply management is crucial for prioritizing responses and ensuring that no opportunity slips through the cracks.

Real-life Example:
Let’s say you’re running a sales campaign. Among the 200 responses you get, some are hot leads ready to convert. Gmass can separate these from automated responses, helping you focus on closing deals.

The Reply Project

Why It’s Important:
The Reply Project takes reply management a step further by providing templated responses and AI-assisted (ChatGPT) management. It’s like having a virtual assistant that knows your business inside out.

Real-life Example:
You’ve launched a new product and are overwhelmed with inquiries. The Reply Project can automatically categorize these into “Interested,” “Needs More Info,” and “Not Interested,” allowing you to tailor your follow-ups more effectively.

Email List Builder

Why It’s Important:
Building targeted email lists is the cornerstone of any successful email marketing campaign. The ability to do this directly within Gmail saves you time and minimizes errors from manual data entry.

Real-life Example:
You’re an event organizer looking to promote a new webinar. You can use GMass’s Email List Builder to create a targeted list based on past event attendees right within Gmail.

SMTP Tester

Why It’s Important:
An unreliable SMTP server can ruin even the most well-planned email campaign. The SMTP tester ensures that your email server won’t be the weak link in your marketing strategy.

Real-life Example:
You’re a marketing manager and your last email campaign had a lower-than-average open rate. With the SMTP tester, you can rule out server issues and focus on improving the email content or strategy.

Instantly: Features that Set It Apart

Feature Benefits
Unlimited Domains Scale without limits, all under one pricing plan.
Automated Domain Rotation Maximize your sending capabilities.
Built-in AI for Recipient Interest Prioritize responses intelligently.
Bulk Domain Testing Ensure optimal email deliverability.

Unlimited Domains

Why It’s Important:
The ability to have unlimited domains under a single pricing plan is unparalleled for scalability. It gives you the freedom to expand your campaigns without worrying about additional costs.

Real-life Example:
You’re running a digital agency with multiple clients in different niches. Unlimited domains mean you can run specialized campaigns for each client without needing a new subscription.

Automated Domain Rotation

Why It’s Important:
This feature helps you bypass sending limits set by email providers, allowing you to maximize your outreach efforts without getting flagged or blacklisted.

Real-life Example:
You’re a freelancer using multiple domains to send portfolio emails to potential clients. Once you hit the sending limit on one domain, Instantly automatically switches to the next, ensuring continuous outreach.

Built-in AI for Recipient Interest

Why It’s Important:
AI-driven response prioritization is like having a sales assistant who knows which leads are most likely to convert. This feature helps you focus your efforts on high-potential prospects, improving ROI.

Real-life Example:
Imagine you’re a real estate agent with various properties to sell. The built-in AI can prioritize responses from potential buyers who are more likely to make a quick purchase, helping you close deals faster.

Bulk Domain Testing

Why It’s Important:
Email deliverability is crucial in cold email campaigns. The bulk domain testing feature ensures that your emails won’t end up in the spam folder, increasing your chances of reaching your audience.

Real-life Example:
You’re a non-profit organization sending out donation requests. Bulk domain testing ensures your emails reach the inbox, thereby increasing the likelihood of garnering support for your cause.

Cost Factor: The Pricing Game

GMass Pricing Plans

GMass offers four different pricing plans. Each plan is tailored to meet different needs, from small-scale outreach with the Free Plan to large-scale, feature-rich campaigns with the Enterprise Plan. 

Plan Cost per Month Cost per Year Features Included
Free Plan $0 $0 All features with a sending limit of 50 email messages per day
Standard Plan $19.95 per user $199 per user Gmail integration, unlimited contacts and campaigns, mail merge personalization
Premium Plan $29.95 per user $299 per user Includes everything in the Standard plan plus A/B testing, sequences and follow-ups
Enterprise Plan $49.95 per user $499 per user All features

Below, you can see an overview of features offered by the paid plans of GMass:

Instantly Pricing Plans

Instantly offers two primary pricing plans, targeting both growth-stage businesses and enterprises. The plans are as follows:

Plan Cost per Month (If Billed Monthly) Cost per Month (If Billed Yearly) Features Included
Growth Plan $37 $30 1,000 active leads, 5,000 emails, unlimited warm-up, bulk domain testing
Hypergrowth Plan $97 $77.6 25,000 active leads, 100,000 emails, unlimited domains, automated domain rotation, built-in AI

Below, you can see an overview of features offered by the two plans of Instantly:

Pros and Cons: The Real Deal



  • Seamless integration with Gmail
  • Advanced distribution system for large-scale emails
  • Simple to use  
  • Offers Gmass Chrome Extension to send emails from Gmail 


  • Limited to Gmail users
  • No free trial
  • No phone or live chat support
  • No possibility of deleting campaigns 
  • Cannot stop scheduled follow-ups 
  • It can only be used in a web browser 



  • Easy setup and use
  • Cost-effective as you can link unlimited email domains
  • Bulk domain testing: Quickly assesses the reputation and deliverability of multiple domains.
  • Unlimited Warm-Up


  • Does not offer a lifetime deal
  • Relatively new in the market
  • Does not offer a Chrome extension or Email Finder for lead generation 

Direct Showdown: GMass vs. Instantly

Hold onto your seats because we’re diving into the heart of the matter—the direct showdown between Gmass and Instantly. Here, we’ll lay it all out on the table: features, monthly pricing, and even free trials. We’re going side-by-side, feature-by-feature, to help you figure out which tool reigns supreme for your cold email needs. No fluff, just the facts you need to make your decision. Let the showdown begin!

Feature/Aspect Gmass Instantly
Advanced Email Distribution Yes No
Link with Gmail Yes No
Reply Management Yes No
AI-Driven Reply Management Yes – (Manages and replies to them) Yes – (Automatically tags interest levels in replies)
Unlimited Domains No Yes
Automated Domain Rotation No Yes
Email Polling Yes No
Mail Merge Yes No
Email List Builder Yes No
SMTP Testing Yes No
Bulk Domain Testing No Yes
Free Trial None 14 days
Cost Per Month $19.95 – $49.95 per user $30/$77.5 (If Billed Monthly)
$37/$97 (If Billed Annually)

Support Squad: Navigating the Help Landscape


  • FAQs: A robust library for your burning questions.
  • Ticket-Based Email Support: For when you need a detailed walkthrough. No live chat is present. 


  • Live Chat and Email Support: Get your queries answered in real-time or send an email if you are not in a hurry. 
  • Knowledge Base: A repository of tutorials and guides.

Voice of the Users: Real Talk

User reviews often provide the most candid insights. While both tools score highly, it’s crucial to consider what aspects matter most to you.


Users rave about Gmass for its unbeatable affordability, ease of use, and high email-sending limits, highlighting it as the go-to solution for email marketing, especially for small business owners and those dealing with currency exchange challenges. 

G2 Review

⭐️4.7 out of 5


Users are buzzing about its game-changing automated domain feature, its powerhouse warm-up capabilities, and customer support that’s so good. 

G2 Review

⭐️4.9 out of 5

FAQs: Unveiling the Mysteries

What integrations are offered by Gmass?
Has a native integration with Google Sheets and Gmail. For more complex needs, options include the GMass API, webhooks, and Zapier. 

What integrations are offered by Instantly?
Instantly offers Zapier and webhook integrations for advanced automation. 

Final Showdown: Making the Call

After a rigorous side-by-side comparison of GMass and Instantly, it’s time to deliver the final verdict. Both tools have their own unique sets of features, but when it comes to advanced email distribution, reply management, Gmail integration, and AI-driven responses, GMass holds a slight edge. It also has the benefit of mail merge capabilities, SMTP testing, and an email list builder—features that Instantly lacks.

However, Instantly shines with its unlimited domains and automated domain rotation, making it a strong contender for those who need to scale their email marketing efforts. Plus, its bulk domain testing ensures better email deliverability, an often overlooked but vital aspect of any email campaign. Also, Instantly offers a 14-day free trial, which Gmass doesn’t, allowing you to test the waters before diving in.

In terms of pricing, GMass provides a more flexible range, starting with a free plan and going up to $49.95 per user per month. Instantly, on the other hand, starts at $30 per month and can go up to $97 if billed annually.

So, what’s the bottom line? If you’re looking for a tool that integrates seamlessly with Gmail, offers advanced email distribution, and a host of other features, GMass is your go-to option. However, if scalability through unlimited domains and automated domain rotation is more important to you, Instantly should be your pick.

Either way, both tools are strong contenders in the cold email marketing arena. Your choice will ultimately depend on your specific needs and what aspects you prioritize more.

For a broader perspective on cold email tools, feel free to dive into our comprehensive list of the 22 best cold email tools.

Philip Ilic

Philip Ilic

B2B Growth Specialist

Phil helps B2B SaaS companies with growth marketing and is a deep specialist in Linkedin advertising and paid social more generally (Facebook, Twitter, LinkedIn). He runs a paid social agency called and is the founder of


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