
Warmbox.ai
MailReach.co
Warmy.io
Warmup Inbox
Lemwarm by Lemlist
Folderly
lemlist
Email warmup tool to avoid spam folder, since 2020 - Backed by Email Deliverability Experts

Codecademy
Exercism
LeetCode
Treehouse
edX
Coursera
Udemy
Achieve code mastery through challenge.

Which is more popular?
Based on our record, Codewars seems to be more popular. It has been mentioned 160 times since March 2021.
Website, pricing, platforms and company facts side by side.
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| Website | mailwarm.com | codewars.com |
| Pricing | ||
| Platforms | — | |
| Company | Startup from France · 10 - 19 employees · 2020 | — |
| Listed in |
In their own words, as submitted to SaaSHub.


Mailwarm is an automated email warmup and deliverability platform designed to help businesses keep their emails out of spam folders and consistently reach the inbox. Since 2020, Mailwarm has helped founders, sales teams, marketers, and agencies improve email deliverability, build strong sender...
No description of Codewars yet.
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
Codewars is recommended for beginner to advanced programmers who enjoy learning through practice and are interested in improving their algorithmic thinking and coding skills in a gamified environment. It is particularly beneficial for those preparing for coding interviews or seeking to reinforce their programming knowledge in a fun and interactive way.
Walkthroughs and reviews on video.
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Codewars Review & Tips
More videos
How often each product is chosen within a category, 0–100% relative to the other.


As answered by people managing Mailwarm and Codewars.
Mailwarm's answer
Mailwarm is an email warmup and deliverability platform built by a Y Combinator and Station F startup.
Since 2020, we’ve worked with many types of companies: SaaS startups, recruitment agencies, e-commerce brands, and sales teams; to help them improve inbox placement safely.
Mailwarm is unique because it offers: - Real multi-provider warmup (Gmail, Outlook, Microsoft 365, Yahoo)
Clear and real spam score tracking
Built-in bounce prevention
Easy setup and stable automation
Our focus is simple: help businesses keep emails out of spam and land in the inbox.
Mailwarm's answer
Mailwarm delivers real, measurable results instead of risky shortcuts.
Users choose Mailwarm because it provides: - Automated email warmup that protects sender reputation
Multi-provider engagement for realistic signals
Spam score to track deliverability progress
One-click Outlook and Office365 connection
Reliable campaigns with auto-recovery
It’s an easy, transparent, and professional way to improve email deliverability.
Mailwarm's answer
Mailwarm is for anyone who depends on email outreach:
Sales teams sending cold emails
Founders and startups launching new domains
Marketing agencies
Recruiters and staffing firms
Growth and outbound teams
If inbox placement matters to your business, Mailwarm is built for you.
Mailwarm's answer
Mailwarm started as a real problem we faced ourselves.
We were two founders working at Station F in Paris, the largest startup incubator in Europe, trying to sell our own products. Every time we launched outreach campaigns, our emails kept landing in spam.
To solve this, we built an internal email warmup system for our personal use. After deep research into email deliverability, we created a stronger, more reliable solution.
Other startups in the incubator quickly asked to use it too; so we turned it into a real product.
After launching publicly, Mailwarm became #1 Product of the Day on ProductHunt and was accepted into Y Combinator, the world’s most prestigious startup accelerator.
Since then, Mailwarm has grown into a trusted platform used by thousands of companies to improve inbox placement and email deliverability.
Mailwarm's answer
Mailwarm is a secure cloud-based SaaS platform built on:
SMTP and IMAP email protocols
Advanced verification systems
Multi-provider infrastructure
Real-time analytics and monitoring
Reliable automation engines
These technologies ensure stable, continuous email warmup.
Mailwarm's answer
As a Y Combinator and Station F startup, Mailwarm works with:
Tech startups and SaaS companies
Recruitment and staffing agencies
Real Estate Agencies
B2B marketing agencies
E-commerce brands
Sales and outbound teams
Freelancers and consultants
From France to global markets, hundreds of organizations trust Mailwarm to improve email deliverability and inbox placement.
Share your experience with using Mailwarm and Codewars. For example, how are they different and which one is better?
External articles and on-site reviews we used to compare the two products.


I decided to try Mailwarm after having consistent issues with my emails landing in spam folders. At the beginning, I wasn’t fully sure what to expect, but the onboarding process was simple enough to get me started...
I started using Mailwarm because I was struggling with my emails going straight to spam, especially for outreach. At first, I wasn’t expecting much, but after a couple of weeks, I actually started noticing a...
I have been using Mailwarm to warm up email accounts and improve overall deliverability for my outreach campaigns. The setup process was very simple and everything runs automatically without requiring constant...
Edabit offers a learning experience similar to learning a new language, focusing on smaller and more frequent exercises that build proficiency over time. Like Codewars, Edabit provides many challenges that increase in...
In conclusion, while Leetcode remains a valuable resource for coders, the platforms listed above offer varied approaches to learning and improving coding skills. Whether you're drawn to the gamified learning...
This LeetCode alternative has excellent features for anyone looking to sharpen their coding skills. Codewars uses kata, which are small coding exercises that are community developed to help you master your language of...
Recommendations tracked on public social media and blogs since March 2021.


Tracking Mailwarm since Mar 2021.
Recently, I was working on a coding kata on codewars.com. Early on, I started thinking that a potential solution might utilize recursion, a concept that involves a function calling itself. However, I quickly realized that my grasp of... - Source: dev.to / almost 3 years ago
Get more involved. Look into internships and junior SWE positions to get a sample of what you'd be applying for once you graduate. Solve coding challenges, start working on a portfolio of your personal works. I recommend codewars.com for... Source: almost 3 years ago
I'd recommend to play around with some basic coding challenges on leetcode.com or codewars.com. If the course prepared you well you won't find this useful, but playing around with them will make sure that you are comfortable with basics... Source: about 3 years ago
When comparing Mailwarm and Codewars, you can also consider the following products.

Warm up your cold email inbox, and never land in spam anymore!
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Learn the technical skills you need for the job you want. As leaders in online education and learning to code, we’ve taught over 45 million people using a tested curriculum and an interactive learning environment.
Compare Codecademy to Mailwarm or Codewars:

The #1 email warming service to improve your deliverability by generating realistic and meaningful engagement to your emails. Easy-to-use solution to help you land in the main inbox instead of the spam folder.
Compare MailReach.co to Mailwarm or Codewars:

Download and solve practice problems in over 30 different languages.
Compare Exercism to Mailwarm or Codewars:


Practice and level up your development skills and prepare for technical interviews.
Compare LeetCode to Mailwarm or Codewars: