
Instantly.ai
Apollo.io
Reply.io
Mailshake
Hunter.io
SmartLead.ai
Snov.io
The prospecting tool to automate multichannel outreach & actually get replies.

Intercom
Customer.io
MooSend
MailerLite
Sendy
EmailOctopus
TinyLetter
Send activities-based emails to your users to increase engagement and conversion rate.

Which is more popular?
Website, pricing, platforms and company facts side by side.
|
|
|
|
|---|---|---|
| Website | lemlist.com | undersend.com |
| Pricing | ||
| Platforms | — | |
| Company | Startup from France · 100 - 249 employees · 2018 | 2020 |
| Listed in |
In their own words, as submitted to SaaSHub.


lemlist is the #1-ranked sales engagement platform on G2, used by 20,000+ B2B companies to run multichannel outbound at scale. It covers the full outbound workflow in a single tool: a 600M+ contact database, waterfall enrichment (80% email find rate across 8 providers), multichannel sequences...
With Undersend, you can create and send personalized marketing campaigns to your users based on their activities. You can trigger a message when a user does or doesn't do an action. Each email can be personalized by the user properties like first name, sign up date, or whatever you want....
What each product offers, as listed by its team.


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


Overall verdict
Why this product is good
Recommended for
Overall verdict
Why this product is good
Recommended for
Walkthroughs and reviews on video.
Lemlist Review & Full Walkthrough + Tool For Automating & Personalizing Outreach Emails
More videos
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How often each product is chosen within a category, 0–100% relative to the other.


Share your experience with using lemlist and Undersend. For example, how are they different and which one is better?
External articles and on-site reviews we used to compare the two products.


What is the best MCP server for sales teams in 2026? toflow.ai is the most complete MCP server for sales in 2026, covering ICP search, account research, enrichment, sequence enrollment, and outreach across email,...
What is the best AI prospecting tool for B2B sales in 2026? The best tool depends on your team's specific situation. toflow.ai is a strong fit for multi-channel outreach across email, LinkedIn, and WhatsApp, and is...
Once you have logged in your account in Lemlist, you can set the number of emails you want to send each day, and the program will automatically begin to send and respond to emails. Lemwarm makes sure to reply to your...
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When comparing lemlist and Undersend, you can also consider the following products.

Build your own infinitely scalable cold email outreach system with Instantly.
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Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.
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Apollo’s predictive prospecting, sales engagement, and actionable analytics help the teams to reach its full revenue potential.
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We make it easy to send emails triggered by user behavior. Build, measure and improve your emails to activate and retain users
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Reply.io is an AI-driven sales engagement platform that automates cold outreach through unlimited mailboxes, converts website traffic into booked meetings with AI Chat, and empowers your team to streamline the entire sales process with AI SDRs.
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Moosend allows you to design and send your email marketing campaigns and track the results from an easy-to-use web interface as well as a direct SMTP server connection for your smtp client or web application.
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