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Constant Contact vs Mailgun vs SendGrid comparison

 

Comparison Buyer's Guide

Executive Summary

Review summaries and opinions

We asked business professionals to review the solutions they use. Here are some excerpts of what they said:
 

Mindshare comparison

As of April 2026, in the Cloud Email category, the mindshare of Constant Contact is 4.7%, up from 0.7% compared to the previous year. The mindshare of Mailgun is 6.6%, down from 9.2% compared to the previous year. The mindshare of SendGrid is 9.7%, down from 20.0% compared to the previous year. It is calculated based on PeerSpot user engagement data.
Cloud Email Mindshare Distribution
ProductMindshare (%)
SendGrid9.7%
Mailgun6.6%
Constant Contact4.7%
Other79.0%
Cloud Email
 

Featured Reviews

DC
Owner/Founder at a tech services company
It enables me to create and manage an auto-responder series along with list growth management tools.
The goal is to continue to engage with my list. Keeping in touch with new and potential customers helps stay "on top of mind" when needing services.  Just like the name states, it has allowed me to stay in "constant contact" with my subscribers. The most valuable features are creating and…
Christopher Justice - PeerSpot reviewer
Vice President of Operations at BL.INK
Reliable, easy to set up, and offers good email-sending capabilities
We use the solution for high-volume email sending for event management. Simple and perfect for what we need.  It has helped us with email deliverability. The email-sending capabilities are great. It's a very easy product to set up.  The solution is stable. It is scalable.  The solution needs…
Niranjan Sharma - PeerSpot reviewer
Software Developer at a healthcare company with 11-50 employees
Saves server load by sending bulk email notifications efficiently
The best feature SendGrid offers is the ability to send multiple emails at the same time. The ability to send multiple emails at the same time helps my workflow and organization because I do not have to run a loop every time. Once I set all the emails in a comma separator, I can send them to multiple users without creating too much load on my server. SendGrid has positively impacted my organization by solving the notification problem. By using SendGrid, I can easily send notifications to users, and it is simple to use in my Node.js project. SendGrid has helped with notifications because when I send an email, the user knows who is sending it and they can revert back to our CRM team. That is positive for our business and organization.

Quotes from Members

We asked business professionals to review the solutions they use. Here are some excerpts of what they said:
 

Pros

"Customer Service: Outstanding, with email, chat and call capabilities even on weekends."
"Every email I send, gets people to click on something or contact me, and it works."
"Customer Service: Very good but I would have liked to have 24 hours accessibility."
"The ability to email clients using templates setup in the system."
"Just like the name states, it has allowed me to stay in "constant contact" with my subscribers."
"The fact that we have been a customer for so long indicates how vital this solution is for our organisation."
"Email marketing is the most valuable aspect."
"Every time that we send one out, we will get some kind of response."
"Mailgun is cheap, secure, fast, and simple."
"I haven't been required to pay yet because they give me 10k free emails per month, so for medium emails, it's the best choice."
"It's a very easy product to set up."
"The best features SendGrid offers is the template customization, which really helps in creating templates according to client demand and their UI/UX experience."
"It is easy to set up."
"They enable us to automate all the communication with our clients around commercial campaigns, marketing activities, and also during transactional tasks, basically, any transaction that happens on the account."
"The solution scales well."
"My integration team likes that it's very easy to integrate and very easy to automate based on activities that happen on our core banking application."
"Their REST API feature is the most amazing and easy API I have used."
"Since switching to SendGrid, I have seen that time is saved, and the trust of the portals like Gmail and Outlook ensures the emails are received quickly with minimum failure, which increases the business."
"SendGrid is a most powerful third-party tool to use for email sending, and it improves the delivery rates compared to other services."
 

Cons

"Could use better search and certain editing traits."
"Sometimes, you will be typing in a text box and hit the backspace, but the website will think you meant to go back a page. Basically, you end up losing work when this happens and it is hard to predict."
"All Constant Contact wants to do is keep you on a monthly subscription, so if you only want to send out emails on a quarterly basis you must either pay every month you do not use the product, or you must cancel your subscription and then re-open an account every quarter."
"There are certain hiccups in the program that can be improved to make it more user friendly."
"When I started using Constant Contact creating email was very flaky, in terms of crashes and usability (perhaps compared to Weebly etc.). It has improved, however, still needs improvement and email creation still seems clunky and limited compared to other online solutions or website building tools."
"Sometimes, you will be typing in a text box and hit the backspace, but the website will think you meant to go back a page. Basically, you end up losing work when this happens and it is hard to predict."
"The solution needs better templating and email validation."
"Mailgun doesn't have this."
"Preview of email as sent - currently, the preview is an image."
"Maybe they could have a mobile application to give to admins, so they could see some insights related to the data."
"I would prefer an easy plugin for Linux mail installation."
"So, don't think that you could do anything with SendGrid on email matters."
"They are backlogged on feature requests, which is a bit of a shame really."
"The biggest problem that we have faced is with the authentication during login. For certain people, SendGrid requires MFA, which is good as a security feature, but it doesn't always work in all geographies. We've got people and users who are based in Nigeria, and some of those people had real trouble logging into SendGrid because the MFA wouldn't send codes to people on their numbers. The security mechanism that they use for login doesn't work in all geographies."
"The contact limit alerts need to be improved."
"The reporting part needs improvement."
"For my use case, SendGrid is very good. The cost could potentially be improved, though I am not very familiar with pricing details."
 

Pricing and Cost Advice

"The cost is fair, and you end up making enough in sales to pay for it."
"We pay $80 a month to use the solution."
"The solution is relatively inexpensive."
"Its cost can vary. It can go as low as $10 or $15 to $1,000 depending on how much you use it."
"The basic plan starts at €90 per month."
"I use the essential plan which is $20 a month. After that, we use the pro which is $90 a month, and had all our costs bundled in."
"We are using the Advanced plan,10K. That is about $100 per month but sometimes we do go over the limit of the plan."
"My company pays for SendGrid monthly, and though I cannot share the amount, my feedback is that the vendor should accept other modes of payment apart from a credit card."
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Top Industries

By visitors reading reviews
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Construction Company
9%
Manufacturing Company
9%
Government
9%
Financial Services Firm
8%
 

Company Size

By reviewers
Large Enterprise
Midsize Enterprise
Small Business
No data available
No data available
By reviewers
Company SizeCount
Small Business14
Midsize Enterprise1
Large Enterprise6
 

Questions from the Community

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What is your experience regarding pricing and costs for SendGrid?
The pricing experience was reasonable at the beginning, but it increased as my email volume grew.
What needs improvement with SendGrid?
I think SendGrid is great already as it is. If they keep developing it, that would be beneficial. If I were a power u...
What is your primary use case for SendGrid?
Our main use case is integrating SendGrid with Sentinel, and we use the .NET API. For SendGrid with the .NET API, any...
 

Comparisons

 

Also Known As

Retention Science
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Overview

 

Sample Customers

Pajama Program
Stripe. GitHub, Heroku
ScoutMob
Find out what your peers are saying about Twilio, Amazon Web Services (AWS), Intuit and others in Cloud Email. Updated: March 2026.
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