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clearout.io VS StackMail

Compare clearout.io VS StackMail and see what are their differences

clearout.io

Clearout helps sales and marketing teams improve deliverability, maintain CRM data quality, find verified prospects, and prevent bad data from entering their systems through email verification, email finding, prospecting, Form Guard, and Data Pulse.

Rating
5.0 · 20 reviews
Pricing
Open source Freemium $16 (3000 Credits)
Alternatives Is it good?
StackMail

Stackmail is a webmail service whereby you can log in to your emails from any browser at any time!

Rating
0 reviews
Alternatives Is it good?
Omnivery
Security-first transactional email: SMTP relay and REST API for password resets, receipts, 2FA and notifications. 100% owned infrastructure, strict sender vetting, human deliverability, ISO 27001/27701/HIPAA, native SendGrid/Mailgun compatibility. sponsored
Note: These products don't have any matching categories. If you think this is a mistake, please edit the details of one of the products and suggest appropriate categories.

Which is more popular?

Based on our record, clearout.io seems to be more popular. It has been mentioned 7 times since March 2021.

social mentions
7 vs 0
Email Verification popularity
100% vs 0%
alternatives listed
240+ vs 1

Base details

Website, pricing, platforms and company facts side by side.

clearout.io
StackMail
Website clearout.io stackmail.com
Pricing
Open source Freemium $16 (3000 Credits) Official pricing
—
Platforms
Browser iOS Windows Android REST API Mac OSX Wordpress Web +5
—
Company Startup from the United States · 20 - 49 employees · 2019 —
Listed in
Web App Email Marketing CRM Other CRM And Sales Lead Generation Email Verification Email Verification API Email Address Verification Email Finder Data Enrichment Prospecting Email Deliverability +9
Email Email Service Provider Hosted Email Email Clients +1

About clearout.io and StackMail

In their own words, as submitted to SaaSHub.

clearout.io
StackMail

Clearout is an AI-powered data quality, prospecting, and deliverability platform helping businesses maintain accurate customer data, improve campaign performance, and generate more revenue from their GTM efforts. Trusted by 100,000+ businesses worldwide, Clearout processes billions of validations...

Read more about clearout.io

No description of StackMail yet.

Features and specs

What each product offers, as listed by its team.

clearout.io 14 features
StackMail 5 features
  • Google Sheet integration
  • Zapier integration
  • WordPress integration
  • JavaScript code
  • Analytics dashboards
  • Analytics and Reporting
    Yes - Full Reporting Platform included free in all subscriptions
  • Webhooks
  • Real-time APIs
  • Spamtrap Detection
  • Catch-All Domain Detection
  • Gibberish detection
  • Team Collaboration
  • HubSpot 2-Way Sync
  • Admin Controls
  • Privacy-Focused
    StackMail emphasizes data privacy and security, offering encrypted email services without scanning user data for advertising purposes, appealing to privacy-conscious businesses.
  • Business-Oriented Features
    Designed specifically for businesses, it includes features like custom domain email, collaborative tools, calendars, and contact management tailored for professional use.
  • Competitive Pricing
    StackMail offers competitively priced plans compared to some larger email providers, making it accessible for small to medium-sized businesses.
  • No Ads
    Unlike some free email services, StackMail does not display ads to users, providing a cleaner and more professional email experience.
  • Custom Domain Support
    Users can easily set up email addresses with their own custom domain names, enhancing brand professionalism and consistency.

Possible disadvantages

  • Limited Brand Recognition
    As a newer or lesser-known provider compared to Google Workspace or Microsoft 365, StackMail may lack the trust and reputation that larger providers have established.
  • Fewer Third-Party Integrations
    Compared to major email service providers, StackMail may offer fewer integrations with third-party apps and services, limiting its versatility for some businesses.
  • Limited Advanced Features
    It may not offer the same breadth of advanced productivity and collaboration tools that come bundled with larger platforms like Microsoft 365 or Google Workspace.
  • Smaller User Community
    Due to a smaller user base, there may be fewer community resources, third-party tutorials, or troubleshooting forums available online.
  • Uncertain Long-Term Support
    As a smaller company, there might be concerns regarding the long-term viability, updates, and continued support of the service compared to more established providers.

Analysis

An editorial look at what each product does well and who it suits.

clearout.io
StackMail

Overall verdict

  • Clearout.io is generally regarded as a good tool for businesses and marketers looking to maintain clean and valid email lists. Its user-friendly interface, effective features, and customer support make it a popular choice among users.

Why this product is good

  • Clearout.io is considered a reliable email verification service aimed at improving email deliverability by cleaning up email lists. It is known for its accuracy, easy integration with various platforms, and competitive pricing. Users appreciate its wide range of features, including real-time verification, detailed reporting, and risk assessment features that help prevent hard bounces, spam traps, and fake emails.

Recommended for

    Clearout.io is recommended for marketers, businesses, and developers who need to ensure their email lists are clean and deliverable. It is also suitable for organizations that regularly send out newsletters or marketing campaigns and want to maintain a high sender reputation while reducing bounce rates and improving engagement.

Overall verdict

  • StackMail is a solid choice for individuals and businesses seeking a secure, ad-free, privacy-focused email hosting solution with reliable features at a competitive price point.

Why this product is good

  • Ad-free email experience with no data mining or tracking of user content
  • Custom domain email hosting suitable for professional and business use
  • Competitive pricing compared to major enterprise email providers
  • Includes essential productivity tools like calendar, contacts, and webmail access
  • Strong emphasis on privacy and security in data handling
  • Straightforward setup process for custom domains

Recommended for

  • Small to medium-sized businesses wanting professional email addresses
  • Privacy-conscious individuals and organizations
  • Startups looking for cost-effective email hosting
  • Users seeking an alternative to Google Workspace or Microsoft 365
  • Freelancers and entrepreneurs needing custom domain email

Videos

Walkthroughs and reviews on video.

clearout.io 4 videos + Add
StackMail 0 videos + Add

Form Guard - Block Bad Leads At The Point Of Capture

More videos

  • - Email Finder Service Walkthrough | Clearout | Get Pre-Verified Email Address With High Accuracy.
  • - Email verifier Service Walkthrough | Clearout | Top Rated Email Verification Tool with High Accuracy
  • - Clearout Email Verification - Getting Started Video

No StackMail videos yet. You could help us improve this page by suggesting one.

Category popularity

How often each product is chosen within a category, 0–100% relative to the other.

Score bands 0–20 21–40 41–50 51–60 61–100
clearout.io
StackMail
100% 100%
Email Verification
0% 0%
0% 0%
Email
100% 100%
100% 100%
Email Marketing
0% 0%
0% 0%
Email Clients
100% 100%

Questions & Answers

As answered by people managing clearout.io and StackMail.

How would you describe the primary audience of your product?

clearout.io's answer

  • B2B Sales Teams
  • Revenue Operations Teams
  • Demand Generation Teams
  • Growth Marketers
  • SDR and Outbound Teams
  • CRM Administrators
  • Customer Acquisition Teams
  • SaaS Companies
  • Agencies and Data Providers

What makes your product unique?

clearout.io's answer

Clearout combines email verification, prospecting, form validation, and CRM data quality monitoring within a single platform. Instead of solving only one part of the data quality lifecycle, Clearout helps businesses capture, validate, enrich, monitor, and maintain customer data from acquisition through outreach.

What's the story behind your product?

clearout.io's answer

Clearout was created to solve a common problem faced by sales and marketing teams: poor data quality. Invalid emails, outdated contacts, fake form submissions, and inaccurate prospect data lead to wasted budget, lower deliverability, and inefficient outreach. The platform evolved from email verification into a broader data quality ecosystem that helps businesses maintain accurate customer data throughout the entire customer acquisition lifecycle.

Which are the primary technologies used for building your product?

clearout.io's answer

  • Artificial Intelligence (AI)
  • Machine Learning
  • Cloud Infrastructure
  • REST APIs
  • Real-Time Data Processing
  • Telecom & Mail Server Validation Networks
  • Browser Extensions
  • CRM & Marketing Automation Integrations

Why should a person choose your product over its competitors?

clearout.io's answer

Most solutions focus on a single problem, such as verification, enrichment, or prospecting. Clearout helps teams improve deliverability, maintain CRM hygiene, prevent bad data from entering systems, and build verified prospect lists using one platform. This reduces tool sprawl while improving overall GTM efficiency.

Who are some of the biggest customers of your product?

clearout.io's answer

  • Microsoft
  • Linkedin
  • Adobe
  • Chargebee
  • Dripify
  • Remote
  • Dun&Bradstreet
  • Truecaller
  • HCL, etc

User comments

Share your experience with using clearout.io and StackMail. For example, how are they different and which one is better?

Log in or Post with

Reviews and articles

External articles and on-site reviews we used to compare the two products.

clearout.io 5.0 · 20 reviews
StackMail no reviews yet
  • Best Tool for Email validation and CRM contact cleaning
    SaaSHub review
    · Aug 2026

    Previously used Email Verifier to validate contacts for campaign activities. Implemented Form Guard to prevent fake and spam leads. Now using DataPulse to clean and maintain CRM contacts. This helps improve data...

  • Best tool for keepign CRM clean
    SaaSHub review
    · Jul 2026

    We've been using Clearout for the past few months, and it's been working like a charm. The email validation is accurate, and the Form Guard integration was incredibly smooth. Setup was quick, and it started protecting...

  • Easy to Use and Great for Keeping CRM Data Clean
    SaaSHub review
    · Jul 2026

    Clearout has been easy to use and has helped us keep our CRM data clean and accurate. It quickly finds invalid email addresses, improves our data quality, and works smoothly with our workflow. The customer support...

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We have no reviews of StackMail yet. Be the first one to post

Social recommendations and mentions

Recommendations tracked on public social media and blogs since March 2021.

clearout.io 7 mentions
StackMail 0 mentions
  • Best Sales Tools
    Clearout Email Finder: Marketers frequently wonder if the emails they have gathered, the domains they are eyeing, and the prospects they are contacting are the right ones. Instead of shooting an arrow in the dark, tools like Clearout... Source: over 3 years ago
  • Do you know any tool that enables scraping of LinkedIn accounts? 🧐
    I have been researching and working with multiple lead scraping tool such as Apollo, drop contacts etc., but I have found that these services usually do not validate the data before sharing to us and I found something new that's is... Source: over 3 years ago
  • How do you identify a fake email address
    At Clearout.io we are commonly asked how do we know if the email is fake or not? This is our jam to verify emails at scale. With this guide, we will help anyone to get smarter and better at spotting fake emails. Source: almost 4 years ago

View more

Tracking StackMail since Aug 2023.

Alternatives to clearout.io and StackMail

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